Progress Energy (PREX) 10-K 24 Feb 22 2021 FY Annual report Financial data

Cover Page

Cover Page - USD ($)	12 Months Ended
	Dec. 31, 2021	Jan. 31, 2022	Jun. 30, 2021
Document Information [Line Items]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2021
Current Fiscal Year End Date	--12-31
Document Transition Report	false
Entity File Number	1-32853
Entity Registrant Name	DUKE ENERGY CORPORATION
Entity Tax Identification Number	20-2777218
Entity Incorporation, State or Country Code	DE
Entity Address, Address Line One	526 South Church Street
Entity Address, City or Town	Charlotte
Entity Address, State or Province	NC
Entity Address, Postal Zip Code	28202-1803
City Area Code	704
Local Phone Number	382-3853
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	true
Entity Shell Company	false
Entity Public Float			$ 75,871,309,901
Entity Common Stock, Shares Outstanding		769,358,344
Documents Incorporated by Reference	Portions of the Duke Energy definitive proxy statement for the 2021 Annual Meeting of the Shareholders or an amendment to this Annual Report are incorporated by reference into PART III, Items 10, 11 and 13 hereof. This combined Form 10-K is filed separately by eight registrants: Duke Energy, Duke Energy Carolinas, Progress Energy, Duke Energy Progress, Duke Energy Florida, Duke Energy Ohio, Duke Energy Indiana and Piedmont (collectively the Duke Energy Registrants). Information contained herein relating to any individual registrant is filed by such registrant solely on its own behalf. Each registrant makes no representation as to information relating exclusively to the other registrants.
Entity Central Index Key	0001326160
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	FY
Amendment Flag	false
Common Stock
Document Information [Line Items]
Title of 12(b) Security	Common Stock, $0.001 par value
Trading Symbol	DUK
Security Exchange Name	NYSE
Junior Subordinated Debentures 5.625% Coupon Due September 2078
Document Information [Line Items]
Title of 12(b) Security	5.625% Junior Subordinated Debentures
Trading Symbol	DUKB
Security Exchange Name	NYSE
Depositary Share
Document Information [Line Items]
Title of 12(b) Security	Depositary Shares
Trading Symbol	DUK PR A
Security Exchange Name	NYSE
Duke Energy Carolinas
Document Information [Line Items]
Entity File Number	1-4928
Entity Registrant Name	DUKE ENERGY CAROLINAS, LLC
Entity Tax Identification Number	56-0205520
Entity Incorporation, State or Country Code	NC
Entity Address, Address Line One	526 South Church Street
Entity Address, City or Town	Charlotte
Entity Address, State or Province	NC
Entity Address, Postal Zip Code	28202-1803
City Area Code	704
Local Phone Number	382-3853
Entity Well-known Seasoned Issuer	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Central Index Key	0000030371
Progress Energy
Document Information [Line Items]
Entity File Number	1-15929
Entity Registrant Name	PROGRESS ENERGY, INC.
Entity Tax Identification Number	56-2155481
Entity Incorporation, State or Country Code	NC
Entity Address, Address Line One	410 South Wilmington Street
Entity Address, City or Town	Raleigh
Entity Address, State or Province	NC
Entity Address, Postal Zip Code	27601-1748
City Area Code	704
Local Phone Number	382-3853
Entity Well-known Seasoned Issuer	No
Entity Filer Category	Non-accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Central Index Key	0001094093
Duke Energy Progress
Document Information [Line Items]
Entity File Number	1-3382
Entity Registrant Name	DUKE ENERGY PROGRESS, LLC
Entity Tax Identification Number	56-0165465
Entity Incorporation, State or Country Code	NC
Entity Address, Address Line One	410 South Wilmington Street
Entity Address, City or Town	Raleigh
Entity Address, State or Province	NC
Entity Address, Postal Zip Code	27601-1748
City Area Code	704
Local Phone Number	382-3853
Entity Well-known Seasoned Issuer	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Central Index Key	0000017797
Duke Energy Florida
Document Information [Line Items]
Entity File Number	1-3274
Entity Registrant Name	DUKE ENERGY FLORIDA, LLC
Entity Tax Identification Number	59-0247770
Entity Incorporation, State or Country Code	FL
Entity Address, Address Line One	299 First Avenue North
Entity Address, City or Town	St. Petersburg
Entity Address, State or Province	FL
Entity Address, Postal Zip Code	33701
City Area Code	704
Local Phone Number	382-3853
Entity Well-known Seasoned Issuer	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Central Index Key	0000037637
Duke Energy Ohio
Document Information [Line Items]
Entity File Number	1-1232
Entity Registrant Name	DUKE ENERGY OHIO, INC.
Entity Tax Identification Number	31-0240030
Entity Incorporation, State or Country Code	OH
Entity Address, Address Line One	139 East Fourth Street
Entity Address, City or Town	Cincinnati
Entity Address, State or Province	OH
Entity Address, Postal Zip Code	45202
City Area Code	704
Local Phone Number	382-3853
Entity Well-known Seasoned Issuer	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Central Index Key	0000020290
Duke Energy Indiana
Document Information [Line Items]
Entity File Number	1-3543
Entity Registrant Name	DUKE ENERGY INDIANA, LLC
Entity Tax Identification Number	35-0594457
Entity Incorporation, State or Country Code	IN
Entity Address, Address Line One	1000 East Main Street
Entity Address, City or Town	Plainfield
Entity Address, State or Province	IN
Entity Address, Postal Zip Code	46168
City Area Code	704
Local Phone Number	382-3853
Entity Well-known Seasoned Issuer	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Central Index Key	0000081020
Piedmont
Document Information [Line Items]
Entity File Number	1-6196
Entity Registrant Name	PIEDMONT NATURAL GAS COMPANY, INC.
Entity Tax Identification Number	56-0556998
Entity Incorporation, State or Country Code	NC
Entity Address, Address Line One	4720 Piedmont Row Drive
Entity Address, City or Town	Charlotte
Entity Address, State or Province	NC
Entity Address, Postal Zip Code	28210
City Area Code	704
Local Phone Number	364-3120
Entity Well-known Seasoned Issuer	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Central Index Key	0000078460

Audit Information

Audit Information	12 Months Ended
	Dec. 31, 2021
Auditor [Line Items]
Auditor Firm ID	34
Auditor Name	Deloitte & Touche LLP
Auditor Location	Charlotte, NC
Duke Energy Carolinas
Auditor [Line Items]
Auditor Firm ID	34
Auditor Name	Deloitte & Touche LLP
Auditor Location	Charlotte, NC
Progress Energy
Auditor [Line Items]
Auditor Firm ID	34
Auditor Name	Deloitte & Touche LLP
Auditor Location	Charlotte, NC
Duke Energy Progress
Auditor [Line Items]
Auditor Firm ID	34
Auditor Name	Deloitte & Touche LLP
Auditor Location	Charlotte, NC
Duke Energy Florida
Auditor [Line Items]
Auditor Firm ID	34
Auditor Name	Deloitte & Touche LLP
Auditor Location	Charlotte, NC
Duke Energy Ohio
Auditor [Line Items]
Auditor Firm ID	34
Auditor Name	Deloitte & Touche LLP
Auditor Location	Charlotte, NC
Duke Energy Indiana
Auditor [Line Items]
Auditor Firm ID	34
Auditor Name	Deloitte & Touche LLP
Auditor Location	Charlotte, NC
Piedmont
Auditor [Line Items]
Auditor Firm ID	34
Auditor Name	Deloitte & Touche LLP
Auditor Location	Charlotte, NC

Consolidated Statements of Oper

Consolidated Statements of Operations - USD ($) shares in Millions, $ in Millions		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Operating Revenues
Regulated electric		$ 22,319	$ 21,461	$ 22,615
Regulated natural gas		2,008	1,642	1,759
Nonregulated electric and other		770	765	705
Total operating revenues		25,097	23,868	25,079
Operating Expenses
Operation, maintenance and other		6,042	5,788	6,066
Depreciation and amortization		4,990	4,705	4,548
Property and other taxes		1,389	1,337	1,307
Impairment of assets and other charges		356	984	(8)
Total operating expenses		19,737	19,325	19,366
Gains (Losses) on Sales of Other Assets and Other, net		13	10	(4)
Operating Income		5,373	4,553	5,709
Other Income and Expenses
Equity in earnings (losses) of unconsolidated affiliates		28	(2,005)	162
Other income and expenses, net		643	453	430
Total other income and expenses		671	(1,552)	592
Interest Expense		2,280	2,162	2,204
Income From Continuing Operations Before Income Taxes		3,764	839	4,097
Income Tax Expense (Benefit) From Continuing Operations		192	(236)	519
Income From Continuing Operations		3,572	1,075	3,578
Income (Loss) From Discontinued Operations, net of tax		7	7	(7)
Net Income		3,579	1,082	3,571
Add: Net Loss Attributable to Noncontrolling Interests		329	295	177
Net Income Attributable to Parent		3,908	1,377	3,748
Less: Preferred Dividends		106	107	41
Net Income Available to Common Stockholders		3,802	1,270	3,707
Other Comprehensive Income, net of tax
Pension and OPEB adjustments	[1]	7	6	9
Net unrealized gain on cash flow hedges	[1]	(68)	(138)	(47)
Unrealized (losses) gains on available-for-sale securities	[1]	(8)	3	8
Other Comprehensive Loss, net of tax	[1]	(56)	(118)	(24)
Comprehensive Income		3,523	964	3,547
Add: Comprehensive Loss Attributable to Noncontrolling Interests		(319)	(306)	(177)
Comprehensive Income Attributable to Duke Energy Corporation		$ 3,842	$ 1,270	$ 3,724
Income from continuing operations available to Duke Energy Corporation common stockholders
Basic (usd per share)		$ 4.93	$ 1.71	$ 5.07
Diluted (usd per share)		4.93	1.71	5.07
Income (Loss) from discontinued operations attributable to Duke Energy Corporation common stockholders
Basic (usd per share)		0.01	0.01	(0.01)
Diluted (usd per share)		0.01	0.01	(0.01)
Net income available to Duke Energy Corporation common stockholders
Basic (usd per share)		4.94	1.72	5.06
Diluted (usd per share)		$ 4.94	$ 1.72	$ 5.06
Weighted average shares outstanding
Basic (in shares)		769	737	729
Diluted (in shares)		769	738	729
Fuel used in electric generation and purchased power
Operating Expenses
Fuel used in electric generation and purchased power/Cost of natural gas		$ 6,255	$ 6,051	$ 6,826
Cost of natural gas
Operating Expenses
Fuel used in electric generation and purchased power/Cost of natural gas		705	460	627
Duke Energy Carolinas
Operating Revenues
Total operating revenues		7,102	7,015	7,395
Operating Expenses
Fuel used in electric generation and purchased power/Cost of natural gas		1,601	1,682	1,804
Operation, maintenance and other		1,833	1,743	1,868
Depreciation and amortization		1,468	1,462	1,388
Property and other taxes		320	299	292
Impairment of assets and other charges		227	476	17
Total operating expenses		5,449	5,662	5,369
Gains (Losses) on Sales of Other Assets and Other, net		2	1
Operating Income		1,655	1,354	2,026
Other Income and Expenses
Other income and expenses, net		270	177	151
Total other income and expenses		270	177	151
Interest Expense		538	487	463
Income From Continuing Operations Before Income Taxes		1,387	1,044	1,714
Income Tax Expense (Benefit) From Continuing Operations		51	88	311
Net Income Attributable to Parent		1,336	956	1,403
Other Comprehensive Income, net of tax
Net unrealized gain on cash flow hedges		1
Other Comprehensive Loss, net of tax		1
Comprehensive Income Attributable to Duke Energy Corporation		1,337	956	1,403
Progress Energy
Operating Revenues
Total operating revenues		11,057	10,627	11,202
Operating Expenses
Fuel used in electric generation and purchased power/Cost of natural gas		3,584	3,479	4,024
Operation, maintenance and other		2,529	2,479	2,495
Depreciation and amortization		1,929	1,818	1,845
Property and other taxes		542	545	561
Impairment of assets and other charges		82	495	(24)
Total operating expenses		8,666	8,816	8,901
Gains (Losses) on Sales of Other Assets and Other, net		14	9
Operating Income		2,405	1,820	2,301
Other Income and Expenses
Other income and expenses, net		215	129	141
Total other income and expenses		215	129	141
Interest Expense		794	790	862
Income Before Income Taxes		1,826	1,159	1,580
Income Tax Expense (Benefit) From Continuing Operations		227	113	253
Net Income		1,599	1,046	1,327
Add: Net Loss Attributable to Noncontrolling Interests		(1)	(1)
Net Income Attributable to Parent		1,598	1,045	1,327
Other Comprehensive Income, net of tax
Pension and OPEB adjustments		1	(1)	2
Net unrealized gain on cash flow hedges		3	5	5
Unrealized (losses) gains on available-for-sale securities			(1)	1
Other Comprehensive Loss, net of tax		4	3	8
Comprehensive Income		1,603	1,049	1,335
Add: Comprehensive Loss Attributable to Noncontrolling Interests		1	1
Comprehensive Income Attributable to Duke Energy Corporation		1,602	1,048	1,335
Duke Energy Progress
Operating Revenues
Total operating revenues		5,780	5,422	5,957
Operating Expenses
Fuel used in electric generation and purchased power/Cost of natural gas		1,778	1,743	2,012
Operation, maintenance and other		1,467	1,332	1,446
Depreciation and amortization		1,097	1,116	1,143
Property and other taxes		159	167	176
Impairment of assets and other charges		63	499	12
Total operating expenses		4,564	4,857	4,789
Gains (Losses) on Sales of Other Assets and Other, net		13	8
Operating Income		1,229	573	1,168
Other Income and Expenses
Other income and expenses, net		143	75	100
Total other income and expenses		143	75	100
Interest Expense		306	269	306
Income From Continuing Operations Before Income Taxes		1,066	379	962
Income Tax Expense (Benefit) From Continuing Operations		75	(36)	157
Net Income Attributable to Parent		991	415	805
Other Comprehensive Income, net of tax
Comprehensive Income Attributable to Duke Energy Corporation		991	415	805
Duke Energy Florida
Operating Revenues
Total operating revenues		5,259	5,188	5,231
Operating Expenses
Fuel used in electric generation and purchased power/Cost of natural gas		1,806	1,737	2,012
Operation, maintenance and other		1,048	1,131	1,034
Depreciation and amortization		831	702	702
Property and other taxes		383	381	392
Impairment of assets and other charges		19	(4)	(36)
Total operating expenses		4,087	3,947	4,104
Gains (Losses) on Sales of Other Assets and Other, net		1	1
Operating Income		1,173	1,242	1,127
Other Income and Expenses
Other income and expenses, net		71	53	48
Total other income and expenses		71	53	48
Interest Expense		319	326	328
Income From Continuing Operations Before Income Taxes		925	969	847
Income Tax Expense (Benefit) From Continuing Operations		187	198	155
Net Income Attributable to Parent		738	771	692
Other Comprehensive Income, net of tax
Unrealized (losses) gains on available-for-sale securities		(1)	(1)	1
Other Comprehensive Loss, net of tax		(1)	(1)	1
Comprehensive Income Attributable to Duke Energy Corporation		737	770	693
Duke Energy Ohio
Operating Revenues
Regulated electric		1,493	1,405	1,456
Regulated natural gas		544	453	484
Total operating revenues		2,037	1,858	1,940
Operating Expenses
Operation, maintenance and other		479	463	520
Depreciation and amortization		307	278	265
Property and other taxes		355	324	308
Impairment of assets and other charges		25
Total operating expenses		1,711	1,477	1,576
Gains (Losses) on Sales of Other Assets and Other, net		1
Operating Income		327	381	364
Other Income and Expenses
Other income and expenses, net		18	16	24
Total other income and expenses		18	16	24
Interest Expense		111	102	109
Income From Continuing Operations Before Income Taxes		234	295	279
Income Tax Expense (Benefit) From Continuing Operations		30	43	40
Income From Continuing Operations		204	252	239
Income (Loss) From Discontinued Operations, net of tax				(1)
Net Income Attributable to Parent		204	252	238
Other Comprehensive Income, net of tax
Comprehensive Income Attributable to Duke Energy Corporation		204	252	238
Duke Energy Ohio | Fuel used in electric generation and purchased power
Operating Expenses
Fuel used in electric generation and purchased power/Cost of natural gas		409	339	388
Duke Energy Ohio | Cost of natural gas
Operating Expenses
Fuel used in electric generation and purchased power/Cost of natural gas		136	73	95
Duke Energy Indiana
Operating Revenues
Total operating revenues		3,174	2,795	3,004
Operating Expenses
Fuel used in electric generation and purchased power/Cost of natural gas		985	767	935
Operation, maintenance and other		750	762	790
Depreciation and amortization		615	569	525
Property and other taxes		73	81	69
Impairment of assets and other charges		9
Total operating expenses		2,432	2,179	2,319
Operating Income		742	616	685
Other Income and Expenses
Other income and expenses, net		42	37	41
Total other income and expenses		42	37	41
Interest Expense		196	161	156
Income From Continuing Operations Before Income Taxes		588	492	570
Income Tax Expense (Benefit) From Continuing Operations		107	84	134
Net Income Attributable to Parent		481	408	436
Other Comprehensive Income, net of tax
Comprehensive Income Attributable to Duke Energy Corporation		481	408	436
Piedmont
Operating Revenues
Regulated natural gas		1,555	1,286	1,369
Nonregulated electric and other		14	11	12
Total operating revenues		1,569	1,297	1,381
Operating Expenses
Fuel used in electric generation and purchased power/Cost of natural gas		569	386	532
Operation, maintenance and other		327	322	328
Depreciation and amortization		213	180	172
Property and other taxes		55	53	45
Impairment of assets and other charges		10	7
Total operating expenses		1,174	948	1,077
Operating Income		395	349	304
Other Income and Expenses
Equity in earnings (losses) of unconsolidated affiliates		9	9	8
Other income and expenses, net		55	51	20
Total other income and expenses		64	60	28
Interest Expense		119	118	87
Income From Continuing Operations Before Income Taxes		340	291	245
Income Tax Expense (Benefit) From Continuing Operations		30	18	43
Net Income Attributable to Parent		310	273	202
Other Comprehensive Income, net of tax
Comprehensive Income Attributable to Duke Energy Corporation		$ 310	$ 273	$ 202
[1]	Net of income tax impacts of approximately $17 million and $35 million for the years ended December 31, 2021, and 2020, respectively. Tax impacts are immaterial for other periods presented.

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Statement of Comprehensive Income [Abstract]
Net income		$ 3,579	$ 1,082	$ 3,571
Other Comprehensive Income, net of tax
Pension and OPEB adjustments	[1]	7	6	9
Net unrealized losses on cash flow hedges	[1]	(68)	(138)	(47)
Reclassification into earnings from cash flow hedges	[1]	13	11	6
Unrealized (losses) gains on available-for-sale securities	[1]	(8)	3	8
Other Comprehensive Loss, net of tax	[1]	(56)	(118)	(24)
Comprehensive Income		3,523	964	3,547
Add: Comprehensive Loss Attributable to Noncontrolling Interests		319	306	177
Comprehensive Income Attributable to Duke Energy Corporation		3,842	1,270	3,724
Less: Preferred Dividends		106	107	41
Comprehensive Income Available to Duke Energy Corporation Common Stockholders		$ 3,736	$ 1,163	$ 3,683
[1]	Net of income tax impacts of approximately $17 million and $35 million for the years ended December 31, 2021, and 2020, respectively. Tax impacts are immaterial for other periods presented.

Consolidated Statements of Co_2

Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Statement of Comprehensive Income [Abstract]
Other comprehensive income (loss), tax	$ 17	$ 35

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Current Assets
Cash and cash equivalents	$ 343	$ 259
Receivables (net of allowance for doubtful accounts)	1,173	1,009
Receivables of VIEs (net of allowance for doubtful accounts)	2,437	2,144
Inventory	3,199	3,167
Regulatory assets (includes amounts related to VIEs)	2,150	1,641
Other (including amounts related to VIEs)	638	462
Total current assets	9,940	8,682
Property, Plant and Equipment
Cost	161,819	155,580
Accumulated depreciation and amortization	(50,555)	(48,827)
Facilities to be retired, net	144	29
Net property, plant and equipment	111,408	106,782
Other Noncurrent Assets
Goodwill	19,303	19,303
Regulatory assets (includes amounts related to VIEs)	12,487	12,421
Nuclear decommissioning trust funds	10,401	9,114
Operating lease right-of-use assets, net	1,266	1,524
Investments in equity method unconsolidated affiliates	970	961
Other (including amounts related to VIEs)	3,812	3,601
Total other noncurrent assets	48,239	46,924
Total Assets	169,587	162,388
Current Liabilities
Accounts payable	3,629	3,144
Notes payable and commercial paper	3,304	2,873
Taxes accrued	749	482
Interest accrued	533	537
Current maturities of long-term debt (includes amounts related to VIEs)	3,387	4,238
Asset retirement obligations	647	718
Regulatory liabilities	1,211	1,377
Other	2,471	2,936
Total current liabilities	15,931	16,305
Long-Term Debt (includes amounts related to VIEs)	60,448	55,625
Other Noncurrent Liabilities
Deferred income taxes	9,379	9,244
Asset retirement obligations	12,129	12,286
Regulatory liabilities	16,152	15,029
Operating lease liabilities	1,074	1,340
Accrued pension and other post-retirement benefit costs	855	969
Investment tax credits	833	687
Other (includes amounts related to VIEs)	1,650	1,719
Total other noncurrent liabilities	42,072	41,274
Commitments and Contingencies
Equity
Common stock	1	1
Additional paid-in capital	44,371	43,767
Retained earnings	3,265	2,471
Accumulated other comprehensive (loss) income	(303)	(237)
Total Parent stockholders' equity	49,296	47,964
Noncontrolling interests	1,840	1,220
Total equity	51,136	49,184
Total Liabilities and Equity	169,587	162,388
VIEs
Current Assets
Regulatory assets (includes amounts related to VIEs)	105	53
Other (including amounts related to VIEs)	256	296
Other Noncurrent Assets
Regulatory assets (includes amounts related to VIEs)	1,823	937
Other (including amounts related to VIEs)	92	81
Current Liabilities
Current maturities of long-term debt (includes amounts related to VIEs)	243	472
Long-Term Debt (includes amounts related to VIEs)	4,854	3,535
Other Noncurrent Liabilities
Other (includes amounts related to VIEs)	319	316
Series A Preferred Stock
Equity
Preferred stock	973	973
Series B Preferred Stock
Equity
Preferred stock	989	989
Duke Energy Carolinas
Current Assets
Cash and cash equivalents	7	21
Receivables (net of allowance for doubtful accounts)	300	247
Receivables of VIEs (net of allowance for doubtful accounts)	844	696
Receivables from affiliated companies	190	124
Inventory	1,026	1,010
Regulatory assets (includes amounts related to VIEs)	544	473
Other (including amounts related to VIEs)	95	20
Total current assets	3,006	2,591
Property, Plant and Equipment
Cost	51,874	50,640
Accumulated depreciation and amortization	(17,854)	(17,453)
Facilities to be retired, net	102
Net property, plant and equipment	34,122	33,187
Other Noncurrent Assets
Regulatory assets (includes amounts related to VIEs)	2,935	2,996
Nuclear decommissioning trust funds	5,759	4,977
Operating lease right-of-use assets, net	92	110
Other (including amounts related to VIEs)	1,248	1,187
Total other noncurrent assets	10,034	9,270
Total Assets	47,162	45,048
Current Liabilities
Accounts payable	988	1,000
Accounts payable to affiliated companies	266	199
Notes payable to affiliated companies	226	506
Taxes accrued	274	76
Interest accrued	125	117
Current maturities of long-term debt (includes amounts related to VIEs)	362	506
Asset retirement obligations	249	264
Regulatory liabilities	487	473
Other	546	546
Total current liabilities	3,523	3,687
Long-Term Debt (includes amounts related to VIEs)	12,595	11,412
Long-Term Debt Payable to Affiliated Companies	318	300
Other Noncurrent Liabilities
Deferred income taxes	3,634	3,842
Asset retirement obligations	5,052	5,086
Regulatory liabilities	7,198	6,535
Operating lease liabilities	78	97
Accrued pension and other post-retirement benefit costs	50	73
Investment tax credits	287	236
Other (includes amounts related to VIEs)	536	626
Total other noncurrent liabilities	16,835	16,495
Commitments and Contingencies
Equity
Member's equity	13,897	13,161
Accumulated other comprehensive (loss) income	(6)	(7)
Total member's equity	13,891	13,154
Total Liabilities and Equity	47,162	45,048
Duke Energy Carolinas | VIEs
Current Assets
Regulatory assets (includes amounts related to VIEs)	12
Other Noncurrent Assets
Regulatory assets (includes amounts related to VIEs)	220
Current Liabilities
Current maturities of long-term debt (includes amounts related to VIEs)	5
Long-Term Debt (includes amounts related to VIEs)	703
Progress Energy
Current Assets
Cash and cash equivalents	70	59
Receivables (net of allowance for doubtful accounts)	247	228
Receivables of VIEs (net of allowance for doubtful accounts)	1,006	901
Receivables from affiliated companies	121	157
Inventory	1,398	1,375
Regulatory assets (includes amounts related to VIEs)	1,030	758
Other (including amounts related to VIEs)	125	109
Total current assets	3,997	3,587
Property, Plant and Equipment
Cost	60,894	57,892
Accumulated depreciation and amortization	(19,214)	(18,368)
Facilities to be retired, net	26	29
Net property, plant and equipment	41,706	39,553
Other Noncurrent Assets
Goodwill	3,655	3,655
Regulatory assets (includes amounts related to VIEs)	5,909	5,775
Nuclear decommissioning trust funds	4,642	4,137
Operating lease right-of-use assets, net	691	690
Other (including amounts related to VIEs)	1,242	1,227
Total other noncurrent assets	16,139	15,484
Total Assets	61,842	58,624
Current Liabilities
Accounts payable	1,099	919
Accounts payable to affiliated companies	506	289
Notes payable to affiliated companies	2,809	2,969
Taxes accrued	128	121
Interest accrued	192	202
Current maturities of long-term debt (includes amounts related to VIEs)	1,082	1,426
Asset retirement obligations	275	283
Regulatory liabilities	478	640
Other	868	793
Total current liabilities	7,437	7,642
Long-Term Debt (includes amounts related to VIEs)	19,591	17,688
Long-Term Debt Payable to Affiliated Companies	150	150
Other Noncurrent Liabilities
Deferred income taxes	4,564	4,396
Asset retirement obligations	5,837	5,866
Regulatory liabilities	5,566	5,051
Operating lease liabilities	606	623
Accrued pension and other post-retirement benefit costs	417	505
Other (includes amounts related to VIEs)	526	462
Total other noncurrent liabilities	17,516	16,903
Commitments and Contingencies
Equity
Additional paid-in capital	9,149	9,143
Retained earnings	8,007	7,109
Accumulated other comprehensive (loss) income	(11)	(15)
Total Parent stockholders' equity	17,145	16,237
Noncontrolling interests	3	4
Total equity	17,148	16,241
Total Liabilities and Equity	61,842	58,624
Progress Energy | VIEs
Current Assets
Regulatory assets (includes amounts related to VIEs)	93	53
Other (including amounts related to VIEs)	39	39
Other Noncurrent Assets
Regulatory assets (includes amounts related to VIEs)	1,603	937
Current Liabilities
Current maturities of long-term debt (includes amounts related to VIEs)	71	305
Long-Term Debt (includes amounts related to VIEs)	2,293	1,252
Duke Energy Progress
Current Assets
Cash and cash equivalents	35	39
Receivables (net of allowance for doubtful accounts)	127	132
Receivables of VIEs (net of allowance for doubtful accounts)	574	500
Receivables from affiliated companies	65	50
Inventory	921	911
Regulatory assets (includes amounts related to VIEs)	533	492
Other (including amounts related to VIEs)	83	60
Total current assets	2,338	2,184
Property, Plant and Equipment
Cost	37,018	35,759
Accumulated depreciation and amortization	(13,387)	(12,801)
Facilities to be retired, net	26	29
Net property, plant and equipment	23,657	22,987
Other Noncurrent Assets
Regulatory assets (includes amounts related to VIEs)	4,118	3,976
Nuclear decommissioning trust funds	4,089	3,500
Operating lease right-of-use assets, net	389	346
Other (including amounts related to VIEs)	792	740
Total other noncurrent assets	9,388	8,562
Total Assets	35,383	33,733
Current Liabilities
Accounts payable	476	454
Accounts payable to affiliated companies	310	215
Notes payable to affiliated companies	172	295
Taxes accrued	163	85
Interest accrued	96	99
Current maturities of long-term debt (includes amounts related to VIEs)	556	603
Asset retirement obligations	274	283
Regulatory liabilities	381	530
Other	448	411
Total current liabilities	2,876	2,975
Long-Term Debt (includes amounts related to VIEs)	9,543	8,505
Long-Term Debt Payable to Affiliated Companies	150	150
Other Noncurrent Liabilities
Deferred income taxes	2,208	2,298
Asset retirement obligations	5,401	5,352
Regulatory liabilities	4,868	4,394
Operating lease liabilities	350	323
Accrued pension and other post-retirement benefit costs	221	242
Investment tax credits	128	132
Other (includes amounts related to VIEs)	87	102
Total other noncurrent liabilities	13,263	12,843
Commitments and Contingencies
Equity
Total member's equity	9,551	9,260
Total Liabilities and Equity	35,383	33,733
Duke Energy Progress | VIEs
Current Assets
Regulatory assets (includes amounts related to VIEs)	39
Other Noncurrent Assets
Regulatory assets (includes amounts related to VIEs)	720
Current Liabilities
Current maturities of long-term debt (includes amounts related to VIEs)	15
Long-Term Debt (includes amounts related to VIEs)	1,097
Duke Energy Florida
Current Assets
Cash and cash equivalents	23	11
Receivables (net of allowance for doubtful accounts)	117	94
Receivables of VIEs (net of allowance for doubtful accounts)	432	401
Receivables from affiliated companies	16	3
Inventory	477	464
Regulatory assets (includes amounts related to VIEs)	497	265
Other (including amounts related to VIEs)	80	41
Total current assets	1,642	1,279
Property, Plant and Equipment
Cost	23,865	22,123
Accumulated depreciation and amortization	(5,819)	(5,560)
Net property, plant and equipment	18,046	16,563
Other Noncurrent Assets
Regulatory assets (includes amounts related to VIEs)	1,791	1,799
Nuclear decommissioning trust funds	553	637
Operating lease right-of-use assets, net	302	344
Other (including amounts related to VIEs)	399	335
Total other noncurrent assets	3,045	3,115
Total Assets	22,733	20,957
Current Liabilities
Accounts payable	623	465
Accounts payable to affiliated companies	209	85
Notes payable to affiliated companies	199	196
Taxes accrued	51	82
Interest accrued	68	69
Current maturities of long-term debt (includes amounts related to VIEs)	76	823
Asset retirement obligations	1
Regulatory liabilities	98	110
Other	408	374
Total current liabilities	1,733	2,204
Long-Term Debt (includes amounts related to VIEs)	8,406	7,092
Other Noncurrent Liabilities
Deferred income taxes	2,434	2,191
Asset retirement obligations	436	514
Regulatory liabilities	698	658
Operating lease liabilities	256	300
Accrued pension and other post-retirement benefit costs	166	231
Other (includes amounts related to VIEs)	309	209
Total other noncurrent liabilities	4,299	4,103
Commitments and Contingencies
Equity
Member's equity	8,298	7,560
Accumulated other comprehensive (loss) income	(3)	(2)
Total member's equity	8,295	7,558
Total Liabilities and Equity	22,733	20,957
Duke Energy Florida | VIEs
Current Assets
Regulatory assets (includes amounts related to VIEs)	54	53
Other (including amounts related to VIEs)	39	39
Other Noncurrent Assets
Regulatory assets (includes amounts related to VIEs)	883	937
Current Liabilities
Current maturities of long-term debt (includes amounts related to VIEs)	56	305
Long-Term Debt (includes amounts related to VIEs)	1,196	1,002
Duke Energy Ohio
Current Assets
Cash and cash equivalents	13	14
Receivables (net of allowance for doubtful accounts)	96	98
Receivables from affiliated companies	122	102
Notes receivable from affiliated companies	15
Inventory	116	110
Regulatory assets (includes amounts related to VIEs)	72	39
Other (including amounts related to VIEs)	57	31
Total current assets	491	394
Property, Plant and Equipment
Cost	11,725	11,022
Accumulated depreciation and amortization	(3,106)	(3,013)
Facilities to be retired, net	6
Net property, plant and equipment	8,625	8,009
Other Noncurrent Assets
Goodwill	920	920
Regulatory assets (includes amounts related to VIEs)	635	610
Operating lease right-of-use assets, net	19	20
Other (including amounts related to VIEs)	84	72
Total other noncurrent assets	1,658	1,622
Total Assets	10,774	10,025
Current Liabilities
Accounts payable	348	279
Accounts payable to affiliated companies	64	68
Notes payable to affiliated companies	103	169
Taxes accrued	275	247
Interest accrued	30	31
Current maturities of long-term debt (includes amounts related to VIEs)		50
Asset retirement obligations	13	3
Regulatory liabilities	62	65
Other	82	70
Total current liabilities	977	982
Long-Term Debt (includes amounts related to VIEs)	3,168	3,014
Long-Term Debt Payable to Affiliated Companies	25	25
Other Noncurrent Liabilities
Deferred income taxes	1,050	981
Asset retirement obligations	123	108
Regulatory liabilities	739	748
Operating lease liabilities	18	20
Accrued pension and other post-retirement benefit costs	109	113
Other (includes amounts related to VIEs)	101	99
Total other noncurrent liabilities	2,140	2,069
Commitments and Contingencies
Equity
Common stock	762	762
Additional paid-in capital	3,100	2,776
Retained earnings	602	397
Total Parent stockholders' equity	4,464	3,935
Total Liabilities and Equity	10,774	10,025
Duke Energy Indiana
Current Assets
Cash and cash equivalents	6	7
Receivables (net of allowance for doubtful accounts)	100	55
Receivables from affiliated companies	98	112
Notes receivable from affiliated companies	134
Inventory	418	473
Regulatory assets (includes amounts related to VIEs)	277	125
Other (including amounts related to VIEs)	68	37
Total current assets	1,101	809
Property, Plant and Equipment
Cost	17,343	17,382
Accumulated depreciation and amortization	(5,583)	(5,661)
Net property, plant and equipment	11,760	11,721
Other Noncurrent Assets
Regulatory assets (includes amounts related to VIEs)	1,278	1,203
Operating lease right-of-use assets, net	53	55
Other (including amounts related to VIEs)	296	253
Total other noncurrent assets	1,627	1,511
Total Assets	14,488	14,041
Current Liabilities
Accounts payable	282	188
Accounts payable to affiliated companies	221	88
Notes payable to affiliated companies		131
Taxes accrued	73	62
Interest accrued	49	51
Current maturities of long-term debt (includes amounts related to VIEs)	84	70
Asset retirement obligations	110	168
Regulatory liabilities	127	111
Other	105	83
Total current liabilities	1,051	952
Long-Term Debt (includes amounts related to VIEs)	4,089	3,871
Long-Term Debt Payable to Affiliated Companies	150	150
Other Noncurrent Liabilities
Deferred income taxes	1,303	1,228
Asset retirement obligations	877	1,008
Regulatory liabilities	1,565	1,627
Operating lease liabilities	50	53
Accrued pension and other post-retirement benefit costs	167	171
Investment tax credits	177	168
Other (includes amounts related to VIEs)	44	30
Total other noncurrent liabilities	4,183	4,285
Commitments and Contingencies
Equity
Total member's equity	5,015	4,783
Total Liabilities and Equity	14,488	14,041
Piedmont
Current Assets
Receivables (net of allowance for doubtful accounts)	318	250
Receivables from affiliated companies	11	10
Inventory	109	68
Regulatory assets (includes amounts related to VIEs)	141	153
Other (including amounts related to VIEs)	9	20
Total current assets	588	501
Property, Plant and Equipment
Cost	9,918	9,134
Accumulated depreciation and amortization	(1,899)	(1,749)
Facilities to be retired, net	11
Net property, plant and equipment	8,030	7,385
Other Noncurrent Assets
Goodwill	49	49
Regulatory assets (includes amounts related to VIEs)	316	302
Operating lease right-of-use assets, net	16	20
Investments in equity method unconsolidated affiliates	95	88
Other (including amounts related to VIEs)	288	270
Total other noncurrent assets	764	729
Total Assets	9,382	8,615
Current Liabilities
Accounts payable	196	230
Accounts payable to affiliated companies	40	79
Notes payable to affiliated companies	518	530
Taxes accrued	63	23
Interest accrued	37	34
Current maturities of long-term debt (includes amounts related to VIEs)		160
Regulatory liabilities	56	88
Other	81	69
Total current liabilities	991	1,213
Long-Term Debt (includes amounts related to VIEs)	2,968	2,620
Other Noncurrent Liabilities
Deferred income taxes	815	821
Asset retirement obligations	22	20
Regulatory liabilities	1,058	1,044
Operating lease liabilities	14	19
Accrued pension and other post-retirement benefit costs	7	8
Other (includes amounts related to VIEs)	158	155
Total other noncurrent liabilities	2,074	2,067
Commitments and Contingencies
Equity
Common stock	1,635	1,310
Retained earnings	1,714	1,405
Total Parent stockholders' equity	3,349	2,715
Total Liabilities and Equity	$ 9,382	$ 8,615

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Allowance for doubtful accounts - receivables	$ 46	$ 29
Regulatory Assets: Current	2,150	1,641
Current Assets: Other	638	462
Other Noncurrent Assets: Regulatory assets	12,487	12,421
Other Noncurrent Assets: Other	3,812	3,601
Current maturities of long-term debt	3,387	4,238
Long-term debt	60,448	55,625
Other Noncurrent Liabilities: Other	$ 1,650	$ 1,719
Preferred stock, par value (in usd per share)	$ 0	$ 0
Common stock, par value (usd per share)	$ 0.001	$ 0.001
Common stock, shares authorized (in shares)	2,000,000,000
Common stock, shares outstanding (in shares)	769,000,000
Cost	$ 161,819	$ 155,580
VIEs
Allowance for doubtful accounts - receivables of VIEs	76	117
Regulatory Assets: Current	105	53
Current Assets: Other	256	296
Other Noncurrent Assets: Regulatory assets	1,823	937
Other Noncurrent Assets: Other	92	81
Current maturities of long-term debt	243	472
Long-term debt	4,854	3,535
Other Noncurrent Liabilities: Other	$ 319	$ 316
Series A Preferred Stock
Preferred stock, par value (in usd per share)	$ 0.001	$ 0.001
Preferred stock, depositary shares authorized (in shares)	40,000,000	40,000,000
Preferred stock, depositary shares outstanding (in shares)	40,000,000	40,000,000
Series B Preferred Stock
Preferred stock, par value (in usd per share)	$ 0.001	$ 0.001
Preferred stock, depositary shares authorized (in shares)	1,000,000	1,000,000
Preferred stock, depositary shares outstanding (in shares)	1,000,000	1,000,000
Duke Energy Carolinas
Allowance for doubtful accounts - receivables	$ 1	$ 1
Regulatory Assets: Current	544	473
Current Assets: Other	95	20
Other Noncurrent Assets: Regulatory assets	2,935	2,996
Other Noncurrent Assets: Other	1,248	1,187
Current maturities of long-term debt	362	506
Long-term debt	12,595	11,412
Other Noncurrent Liabilities: Other	536	626
Cost	51,874	50,640
Duke Energy Carolinas | VIEs
Allowance for doubtful accounts - receivables of VIEs	41	22
Regulatory Assets: Current	12
Other Noncurrent Assets: Regulatory assets	220
Current maturities of long-term debt	5
Long-term debt	703
Progress Energy
Allowance for doubtful accounts - receivables	11	8
Regulatory Assets: Current	1,030	758
Current Assets: Other	125	109
Other Noncurrent Assets: Regulatory assets	5,909	5,775
Other Noncurrent Assets: Other	1,242	1,227
Current maturities of long-term debt	1,082	1,426
Long-term debt	19,591	17,688
Other Noncurrent Liabilities: Other	$ 526	$ 462
Common stock, par value (usd per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	100	100
Common stock, shares outstanding (in shares)	100	100
Cost	$ 60,894	$ 57,892
Progress Energy | VIEs
Allowance for doubtful accounts - receivables of VIEs	25	29
Regulatory Assets: Current	93	53
Current Assets: Other	39	39
Other Noncurrent Assets: Regulatory assets	1,603	937
Current maturities of long-term debt	71	305
Long-term debt	2,293	1,252
Duke Energy Progress
Allowance for doubtful accounts - receivables	4	4
Regulatory Assets: Current	533	492
Current Assets: Other	83	60
Other Noncurrent Assets: Regulatory assets	4,118	3,976
Other Noncurrent Assets: Other	792	740
Current maturities of long-term debt	556	603
Long-term debt	9,543	8,505
Other Noncurrent Liabilities: Other	87	102
Cost	37,018	35,759
Duke Energy Progress | VIEs
Allowance for doubtful accounts - receivables of VIEs	17	19
Regulatory Assets: Current	39
Other Noncurrent Assets: Regulatory assets	720
Current maturities of long-term debt	15
Long-term debt	1,097
Duke Energy Florida
Allowance for doubtful accounts - receivables	8	4
Regulatory Assets: Current	497	265
Current Assets: Other	80	41
Other Noncurrent Assets: Regulatory assets	1,791	1,799
Other Noncurrent Assets: Other	399	335
Current maturities of long-term debt	76	823
Long-term debt	8,406	7,092
Other Noncurrent Liabilities: Other	309	209
Cost	23,865	22,123
Duke Energy Florida | VIEs
Allowance for doubtful accounts - receivables of VIEs	8	10
Regulatory Assets: Current	54	53
Current Assets: Other	39	39
Other Noncurrent Assets: Regulatory assets	883	937
Current maturities of long-term debt	56	305
Long-term debt	1,196	1,002
Duke Energy Ohio
Allowance for doubtful accounts - receivables	4	4
Regulatory Assets: Current	72	39
Current Assets: Other	57	31
Other Noncurrent Assets: Regulatory assets	635	610
Other Noncurrent Assets: Other	84	72
Current maturities of long-term debt		50
Long-term debt	3,168	3,014
Other Noncurrent Liabilities: Other	$ 101	$ 99
Common stock, par value (usd per share)	$ 8.50	$ 8.50
Common stock, shares authorized (in shares)	120,000,000	120,000,000
Common stock, shares outstanding (in shares)	90,000,000	90,000,000
Cost	$ 11,725	$ 11,022
Duke Energy Indiana
Allowance for doubtful accounts - receivables	3
Regulatory Assets: Current	277	125
Current Assets: Other	68	37
Other Noncurrent Assets: Regulatory assets	1,278	1,203
Other Noncurrent Assets: Other	296	253
Current maturities of long-term debt	84	70
Long-term debt	4,089	3,871
Other Noncurrent Liabilities: Other	44	30
Cost	17,343	17,382
Piedmont
Allowance for doubtful accounts - receivables	15	12
Regulatory Assets: Current	141	153
Current Assets: Other	9	20
Other Noncurrent Assets: Regulatory assets	316	302
Other Noncurrent Assets: Other	288	270
Current maturities of long-term debt		160
Long-term debt	2,968	2,620
Other Noncurrent Liabilities: Other	$ 158	$ 155
Common stock, shares authorized (in shares)	100	100
Common stock, shares outstanding (in shares)	100	100
Cost	$ 9,918	$ 9,134

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 3,579	$ 1,082	$ 3,571
Net (loss) income attributable to Duke Energy	3,908	1,377	3,748
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and accretion (including amortization of nuclear fuel)	5,663	5,486	5,176
Equity in (earnings) losses of unconsolidated affiliates	(28)	2,005	(162)
Equity component of AFUDC	(171)	(154)	(139)
Impairment of assets and other charges	356	984	(8)
Deferred income taxes	191	54	806
Payments for asset retirement obligations	(540)	(610)	(746)
Provision for rate refunds	(70)	(22)	60
Refund of AMT credit carryforwards		572	573
(Increase) decrease in
Net realized and unrealized mark-to-market and hedging transactions	50	63	(48)
Receivables	(297)	(56)	78
Inventory	(34)	66	(122)
Other current assets	(1,136)	205	10
Increase (decrease) in
Accounts payable	249	(21)	(164)
Taxes accrued	284	117	(224)
Other current liabilities	(13)	(65)	172
Other assets	112	(408)	(555)
Other liabilities	95	(442)	(69)
Net cash provided by (used in) operating activities	8,290	8,856	8,209
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(9,715)	(9,907)	(11,122)
Contributions to equity method investments	(81)	(370)	(324)
Return of investment capital	44	133	11
Purchases of debt and equity securities	(6,098)	(8,011)	(3,348)
Proceeds from sales and maturities of debt and equity securities	6,103	7,949	3,343
Disbursements to canceled equity method investments	(855)
Other	(333)	(398)	(517)
Net cash used in investing activities	(10,935)	(10,604)	(11,957)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from the issuance of long-term debt	9,052	6,330	7,091
Net proceeds from Issuance of Preferred Stock and Preference Stock			1,962
Proceeds from the issuance of common stock	5	2,745	384
Payments for the redemption of long-term debt	(5,294)	(4,506)	(3,476)
Proceeds from the issuance of short-term debt with original maturities greater than 90 days	332	3,009	397
Payments for the redemption of short-term debt with original maturities greater than 90 days	(997)	(2,147)	(479)
Notes payable and commercial paper	1,144	(1,181)	(298)
Contributions from noncontrolling interests	1,575	426	843
Dividends paid	(3,114)	(2,812)	(2,668)
Other	(94)	(133)	(26)
Net cash provided by financing activities	2,609	1,731	3,730
Net decrease in cash, cash equivalents and restricted cash	(36)	(17)	(18)
Cash, cash equivalents and restricted cash at beginning of period	556	573	591
Cash, cash equivalents and restricted cash at end of period	520	556	573
Cash, cash equivalents and restricted cash at beginning of period	259
Cash, cash equivalents and restricted cash at end of period	343	259
Supplemental Disclosures:
Cash paid for interest, net of amount capitalized	2,248	2,186	2,195
Cash received from income taxes	(3)	(585)	(651)
Significant non-cash transactions:
Accrued capital expenditures	1,325	1,116	1,356
Non-cash dividends		110	108
Duke Energy Carolinas
CASH FLOWS FROM OPERATING ACTIVITIES
Net (loss) income attributable to Duke Energy	1,336	956	1,403
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and accretion (including amortization of nuclear fuel)	1,743	1,731	1,671
Equity component of AFUDC	(65)	(62)	(42)
Impairment of assets and other charges	227	476	17
Deferred income taxes	(213)	(260)	133
Payments for asset retirement obligations	(182)	(162)	(278)
Provision for rate refunds	(46)	(5)	36
(Increase) decrease in
Net realized and unrealized mark-to-market and hedging transactions		(4)	(8)
Receivables	(99)	52	(21)
Receivables from affiliated companies	(66)	(10)	68
Inventory	(16)	(14)	(48)
Other current assets	(309)	209	(73)
Increase (decrease) in
Accounts payable	5	55	(50)
Accounts payable to affiliated companies	85	(11)	(20)
Taxes accrued	206	30	(127)
Other current liabilities	(39)	(56)	127
Other assets	21	(102)	(42)
Other liabilities	116	(47)	(37)
Net cash provided by (used in) operating activities	2,704	2,776	2,709
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(2,693)	(2,669)	(2,714)
Purchases of debt and equity securities	(3,425)	(1,602)	(1,658)
Proceeds from sales and maturities of debt and equity securities	3,425	1,602	1,658
Other	(177)	(164)	(204)
Net cash used in investing activities	(2,870)	(2,833)	(2,918)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from the issuance of long-term debt	1,651	998	886
Payments for the redemption of long-term debt	(617)	(813)	(6)
Notes payable to affiliated companies	(280)	477	(410)
Distributions to parent	(600)	(600)	(275)
Other	(1)	(2)	(1)
Net cash provided by financing activities	153	60	194
Net decrease in cash, cash equivalents and restricted cash	(13)	3	(15)
Cash, cash equivalents and restricted cash at beginning of period	21	18	33
Cash, cash equivalents and restricted cash at end of period	8	21	18
Cash, cash equivalents and restricted cash at beginning of period	21
Cash, cash equivalents and restricted cash at end of period	7	21
Supplemental Disclosures:
Cash paid for interest, net of amount capitalized	508	481	433
Cash received from income taxes	233	321	122
Significant non-cash transactions:
Accrued capital expenditures	359	365	347
Progress Energy
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	1,599	1,046	1,327
Net (loss) income attributable to Duke Energy	1,598	1,045	1,327
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and accretion (including amortization of nuclear fuel)	2,302	2,327	2,207
Equity component of AFUDC	(51)	(42)	(66)
Impairment of assets and other charges	82	495	(24)
Deferred income taxes	247	(197)	433
Payments for asset retirement obligations	(288)	(384)	(412)
Provision for rate refunds	(36)	2	15
(Increase) decrease in
Net realized and unrealized mark-to-market and hedging transactions	51	(9)	(34)
Receivables	(97)	(69)	47
Receivables from affiliated companies	18	(81)	81
Inventory	(26)	49	62
Other current assets	(551)	223	184
Increase (decrease) in
Accounts payable	59	(62)	(4)
Accounts payable to affiliated companies	217	(21)	(50)
Taxes accrued	13	75	(74)
Other current liabilities	(32)	139	25
Other assets	(110)	(137)	(341)
Other liabilities	(99)	(177)	(167)
Net cash provided by (used in) operating activities	3,298	3,177	3,209
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(3,668)	(3,488)	(3,952)
Purchases of debt and equity securities	(2,233)	(5,998)	(1,511)
Proceeds from sales and maturities of debt and equity securities	2,322	6,010	1,504
Notes receivable from affiliated companies		164	(164)
Other	(156)	(160)	(190)
Net cash used in investing activities	(3,735)	(3,472)	(4,313)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from the issuance of long-term debt	3,095	1,791	2,187
Payments for the redemption of long-term debt	(1,883)	(2,157)	(1,667)
Notes payable to affiliated companies	(160)	1,148	586
Dividends to parent	(700)	(400)
Other	(2)	(13)	12
Net cash provided by financing activities	350	369	1,118
Net decrease in cash, cash equivalents and restricted cash	(87)	74	14
Cash, cash equivalents and restricted cash at beginning of period	200	126	112
Cash, cash equivalents and restricted cash at end of period	113	200	126
Cash, cash equivalents and restricted cash at beginning of period	59
Cash, cash equivalents and restricted cash at end of period	70	59
Supplemental Disclosures:
Cash paid for interest, net of amount capitalized	813	819	892
Cash received from income taxes	14	149	(79)
Significant non-cash transactions:
Accrued capital expenditures	501	363	447
Duke Energy Progress
CASH FLOWS FROM OPERATING ACTIVITIES
Net (loss) income attributable to Duke Energy	991	415	805
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and accretion (including amortization of nuclear fuel)	1,286	1,299	1,329
Equity component of AFUDC	(34)	(29)	(60)
Impairment of assets and other charges	63	499	12
Deferred income taxes	(46)	(234)	197
Payments for asset retirement obligations	(187)	(304)	(390)
Provision for rate refunds	(36)	2	12
(Increase) decrease in
Net realized and unrealized mark-to-market and hedging transactions	48	1	(6)
Receivables	(52)	(4)	21
Receivables from affiliated companies	(33)	2	(29)
Inventory	(11)	23	20
Other current assets	(147)	98	101
Increase (decrease) in
Accounts payable	12	(127)	32
Accounts payable to affiliated companies	95	12	(75)
Taxes accrued	83	68	(46)
Other current liabilities	(23)	157	68
Other assets	(37)	(215)	(205)
Other liabilities	(16)	3	37
Net cash provided by (used in) operating activities	1,956	1,666	1,823
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(1,746)	(1,581)	(2,108)
Purchases of debt and equity securities	(1,931)	(1,555)	(842)
Proceeds from sales and maturities of debt and equity securities	1,914	1,516	810
Other	(20)	(57)	(119)
Net cash used in investing activities	(1,783)	(1,677)	(2,259)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from the issuance of long-term debt	1,959	1,296	1,269
Payments for the redemption of long-term debt	(1,308)	(1,085)	(605)
Notes payable to affiliated companies	(123)	229	(228)
Distributions to parent	(700)	(400)
Other	(1)	(12)	(1)
Net cash provided by financing activities	(173)	28	435
Net decrease in cash, cash equivalents and restricted cash		17	(1)
Cash, cash equivalents and restricted cash at beginning of period	39	22	23
Cash, cash equivalents and restricted cash at end of period	39	39	22
Cash, cash equivalents and restricted cash at beginning of period	39
Cash, cash equivalents and restricted cash at end of period	35	39
Supplemental Disclosures:
Cash paid for interest, net of amount capitalized	335	301	331
Cash received from income taxes	83	123	(30)
Significant non-cash transactions:
Accrued capital expenditures	163	149	175
Duke Energy Florida
CASH FLOWS FROM OPERATING ACTIVITIES
Net (loss) income attributable to Duke Energy	738	771	692
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and accretion (including amortization of nuclear fuel)	1,011	1,019	869
Equity component of AFUDC	(16)	(12)	(6)
Impairment of assets and other charges	19	(4)	(36)
Deferred income taxes	279	27	180
Payments for asset retirement obligations	(101)	(80)	(22)
(Increase) decrease in
Net realized and unrealized mark-to-market and hedging transactions		(14)	(33)
Receivables	(45)	(64)	26
Receivables from affiliated companies	(13)	(3)	17
Inventory	(15)	26	42
Other current assets	(451)	40	156
Increase (decrease) in
Accounts payable	47	66	(36)
Accounts payable to affiliated companies	124	(46)	40
Taxes accrued	(30)	39	(31)
Other current liabilities	(7)	(7)	(36)
Other assets	(69)	84	(131)
Other liabilities	(69)	(181)	(213)
Net cash provided by (used in) operating activities	1,402	1,661	1,478
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(1,923)	(1,907)	(1,844)
Purchases of debt and equity securities	(302)	(4,443)	(669)
Proceeds from sales and maturities of debt and equity securities	408	4,495	695
Notes receivable from affiliated companies		173	(173)
Other	(136)	(103)	(67)
Net cash used in investing activities	(1,953)	(1,785)	(2,058)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from the issuance of long-term debt	1,135	495	918
Payments for the redemption of long-term debt	(575)	(572)	(262)
Notes payable to affiliated companies	3	196	(108)
Other		(1)	13
Net cash provided by financing activities	563	118	561
Net decrease in cash, cash equivalents and restricted cash	12	(6)	(19)
Cash, cash equivalents and restricted cash at beginning of period	50	56	75
Cash, cash equivalents and restricted cash at end of period	62	50	56
Cash, cash equivalents and restricted cash at beginning of period	11
Cash, cash equivalents and restricted cash at end of period	23	11
Supplemental Disclosures:
Cash paid for interest, net of amount capitalized	308	321	332
Cash received from income taxes	(15)	138	1
Significant non-cash transactions:
Accrued capital expenditures	337	214	272
Duke Energy Ohio
CASH FLOWS FROM OPERATING ACTIVITIES
Net (loss) income attributable to Duke Energy	204	252	238
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and accretion (including amortization of nuclear fuel)	311	283	269
Equity component of AFUDC	(7)	(7)	(13)
Impairment of assets and other charges	25
Deferred income taxes	42	31	81
Payments for asset retirement obligations	(2)	(2)	(8)
Provision for rate refunds	16	14	7
(Increase) decrease in
Receivables	6	(13)	20
Receivables from affiliated companies	(25)	9	22
Inventory	(6)	25	(9)
Other current assets	(60)	(18)	(5)
Increase (decrease) in
Accounts payable	38	2	(17)
Accounts payable to affiliated companies	(4)		(10)
Taxes accrued	26	30	17
Other current liabilities	11	3	1
Other assets	(43)	(32)	(26)
Other liabilities	27	(2)	(41)
Net cash provided by (used in) operating activities	559	575	526
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(848)	(834)	(952)
Notes receivable from affiliated companies	(10)	(19)
Other	(60)	(48)	(68)
Net cash used in investing activities	(918)	(901)	(1,020)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from the issuance of long-term debt	150	467	1,003
Payments for the redemption of long-term debt	(50)		(551)
Notes payable to affiliated companies	(67)	(144)	38
Contribution from parent	325
Net cash provided by financing activities	358	323	490
Net (decrease) increase in cash, cash equivalents and restricted cash	(1)	(3)	(4)
Cash, cash equivalents and restricted cash at beginning of period	14	17	21
Cash, cash equivalents and restricted cash at end of period	13	14	17
Supplemental Disclosures:
Cash paid for interest, net of amount capitalized	107	97	97
Cash received from income taxes	9		(37)
Significant non-cash transactions:
Accrued capital expenditures	135	104	109
Duke Energy Indiana
CASH FLOWS FROM OPERATING ACTIVITIES
Net (loss) income attributable to Duke Energy	481	408	436
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and accretion (including amortization of nuclear fuel)	619	572	531
Equity component of AFUDC	(27)	(23)	(18)
Impairment of assets and other charges	9
Deferred income taxes	34	29	156
Payments for asset retirement obligations	(67)	(63)	(48)
(Increase) decrease in
Receivables	(33)	8	(8)
Receivables from affiliated companies			41
Inventory	55	44	(95)
Other current assets	(181)	(3)	76
Increase (decrease) in
Accounts payable	76	(12)	(10)
Accounts payable to affiliated companies	8	1	4
Taxes accrued	12	13	(25)
Other current liabilities	13	6	15
Other assets	20	(68)	(74)
Other liabilities	(15)	26	16
Net cash provided by (used in) operating activities	1,004	938	997
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(818)	(888)	(876)
Purchases of debt and equity securities	(142)	(37)	(26)
Proceeds from sales and maturities of debt and equity securities	65	22	20
Notes receivable from affiliated companies	(120)	(33)
Other	36	48	(49)
Net cash used in investing activities	(979)	(888)	(931)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from the issuance of long-term debt	300	544	485
Payments for the redemption of long-term debt	(70)	(513)	(213)
Notes payable to affiliated companies	(131)	101	(137)
Distributions to parent	(125)	(200)	(200)
Net cash provided by financing activities	(26)	(68)	(65)
Net (decrease) increase in cash, cash equivalents and restricted cash	(1)	(18)	1
Cash, cash equivalents and restricted cash at beginning of period	7	25	24
Cash, cash equivalents and restricted cash at end of period	6	7	25
Supplemental Disclosures:
Cash paid for interest, net of amount capitalized	194	164	150
Cash received from income taxes	56	36	(6)
Significant non-cash transactions:
Accrued capital expenditures	118	101	102
Piedmont
CASH FLOWS FROM OPERATING ACTIVITIES
Net (loss) income attributable to Duke Energy	310	273	202
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and accretion (including amortization of nuclear fuel)	216	182	174
Equity in (earnings) losses of unconsolidated affiliates	(9)	(9)	(8)
Equity component of AFUDC	(20)	(19)
Impairment of assets and other charges	10	7
Deferred income taxes	4	53	136
Provision for rate refunds	(4)	(33)	2
(Increase) decrease in
Receivables	(77)	10	28
Receivables from affiliated companies	(1)		12
Inventory	(40)	3	(2)
Other current assets	33	(66)	(25)
Increase (decrease) in
Accounts payable	(25)	16	(7)
Accounts payable to affiliated companies	(39)	76	(35)
Taxes accrued	37	3	(60)
Other current liabilities	(26)	(11)	1
Other assets	26	(11)	1
Other liabilities	(4)	7	(10)
Net cash provided by (used in) operating activities	391	481	409
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(850)	(901)	(1,053)
Contributions to equity method investments	(9)		(16)
Return of investment capital	2	2	4
Other	(31)	(28)	(14)
Net cash used in investing activities	(890)	(929)	(1,083)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from the issuance of long-term debt	347	394	596
Payments for the redemption of long-term debt	(160)		(350)
Notes payable to affiliated companies	(13)	54	278
Contribution from parent	325		150
Net cash provided by financing activities	499	448	674
Supplemental Disclosures:
Cash paid for interest, net of amount capitalized	114	115	84
Cash received from income taxes	(13)	(36)	(31)
Significant non-cash transactions:
Accrued capital expenditures	$ 97	$ 106	$ 109

Consolidated Statements of Chan

Consolidated Statements of Changes in Equity - USD ($) $ in Millions		Total		Preferred Stock	Common Stock	Additional Paid In Capital		Retained Earnings		Net Gains (Losses) on Cash Flow Hedges		Net Unrealized Gains (Losses) on Available-for-Sale Securities		Pension and OPEB Adjustments		Common Stockholders' Equity		Noncontrolling Interests		Duke Energy Carolinas		Duke Energy CarolinasMembers Equity		Duke Energy CarolinasNet Gains (Losses) on Cash Flow Hedges	Progress Energy		Progress EnergyAdditional Paid In Capital	Progress EnergyRetained Earnings		Progress EnergyNet Gains (Losses) on Cash Flow Hedges		Progress EnergyNet Unrealized Gains (Losses) on Available-for-Sale Securities		Progress EnergyPension and OPEB Adjustments		Progress EnergyCommon Stockholders' Equity		Progress EnergyNoncontrolling Interests	Duke Energy Progress	Duke Energy ProgressMembers Equity	Duke Energy Florida	Duke Energy FloridaMembers Equity	Duke Energy FloridaNet Unrealized Gains (Losses) on Available-for-Sale Securities	Duke Energy Ohio	Duke Energy OhioCommon Stock	Duke Energy OhioAdditional Paid In Capital	Duke Energy OhioRetained Earnings	Duke Energy Indiana	Duke Energy IndianaMembers Equity	Piedmont	PiedmontCommon Stock	PiedmontRetained Earnings	Common Stock	Common StockCommon Stock	Common StockAdditional Paid In Capital	Common StockCommon Stockholders' Equity	Series A Preferred Stock	[2]	Series A Preferred StockPreferred Stock	[2]	Series A Preferred StockCommon Stockholders' Equity	[2]	Series B Preferred Stock	[2]	Series B Preferred StockPreferred Stock	[2]	Series B Preferred StockCommon Stockholders' Equity	[2]
Beginning Balance (parent) at Dec. 31, 2018		$ 43,834			$ 1	$ 40,795		$ 3,113		$ (14)		$ (3)		$ (75)		$ 43,817		$ 17							$ 14,257		$ 9,143	$ 5,131		$ (12)		$ (1)		$ (7)		$ 14,254		$ 3
Beginning Members' Equity at Dec. 31, 2018																				$ 11,683		$ 11,689		$ (6)																$ 8,441	$ 6,095	$ 6,097	$ (2)						$ 4,339
Beginning Balance (Attributable to Parent) at Dec. 31, 2018																																												$ 3,445	$ 762	$ 2,776	$ (93)			$ 2,091	$ 1,160	$ 931
Balance (in shares) at Dec. 31, 2018																																																						727,000,000
Net income (loss)		3,530						3,707								3,707		(177)
Net (loss) income attributable to Duke Energy		3,748																		1,403		1,403			1,327														$ 805	805	692	692		238			238	$ 436	436	202		202
Net income		3,571																							1,327			1,327								1,327
Contribution from parent																																																		150	150
Other comprehensive income (loss), net of tax		(24)	[1]							(41)		8		9		(24)									8					5		1		2		8					1		1
Stock issuances																																																					$ 552		$ 552	$ 552	$ 973		$ 973		$ 973		$ 989		$ 989		$ 989
Stock issuances (in shares)																																																						6,000,000
Distributions/Dividends to parent		(2,735)						(2,735)								(2,735)				(275)		(275)																											(200)
Sale of noncontrolling interest	[3]	407				(466)				10						(456)		863
Contribution from noncontrolling interest	[4]	428																428
Distributions to noncontrolling interest in subsidiaries		(4)																(4)
Other		1	[5]					23	[5]	(6)	[5]	(2)	[5]	(16)	[5]	(1)	[5]	2	[5]			1		(1)	1	[6]		7	[6]	(3)	[6]	(1)	[6]	(2)	[6]	1	[6]
Ending Balance (parent) at Dec. 31, 2019		47,951		$ 1,962	1	40,881		4,108		(51)		3		(82)		46,822		1,129							15,593		9,143	6,465		(10)		(1)		(7)		15,590		3
Ending Member's Equity at Dec. 31, 2019																				12,811		12,818		(7)																9,246	6,788	6,789	(1)						4,575
Ending Balance (Attributable to Parent) at Dec. 31, 2019																																												3,683	762	2,776	145			2,443	1,310	1,133
Balance (in shares) at Dec. 31, 2019																																																						733,000,000
Net income (loss)		975						1,270								1,270		(295)
Net (loss) income attributable to Duke Energy		1,377																		956		956			1,045														415	415	771	771		252			252	408	408	273		273
Net income		1,082																							1,046			1,045								1,045		1
Other comprehensive income (loss), net of tax		(118)	[1]							(116)		3		6		(107)		(11)							3					5		(1)		(1)		3					(1)		(1)
Stock issuances																																																					2,902		2,902	2,902
Stock issuances (in shares)																																																						36,000,000
Distributions/Dividends to parent		(2,815)						(2,815)								(2,815)				(600)		(600)			(400)			(400)								(400)				(400)									(200)
Contribution from noncontrolling interest	[4]	409				(17)										(17)		426
Distributions to noncontrolling interest in subsidiaries		(30)																(30)
Other		(90)	[7]			1	[7]	(92)	[7]							(91)	[7]	1	[7]	(13)	[8]	(13)	[8]		(1)			(1)								(1)				(1)										(1)		(1)
Ending Balance (parent) at Dec. 31, 2020		49,184		1,962	1	43,767		2,471		(167)		6		(76)		47,964		1,220							16,241		9,143	7,109		(5)		(2)		(8)		16,237		4
Ending Member's Equity at Dec. 31, 2020																				13,154		13,161		(7)															9,260	9,260	7,558	7,560	(2)					4,783	4,783
Ending Balance (Attributable to Parent) at Dec. 31, 2020		47,964																							$ 16,237																			$ 3,935	762	2,776	397			$ 2,715	1,310	1,405
Balance (in shares) at Dec. 31, 2020																									100																			90,000,000						100				769,000,000
Net income (loss)		3,473						3,802								3,802		(329)
Net (loss) income attributable to Duke Energy		3,908																		1,336		1,336			$ 1,598														991	991	738	738		$ 204			204	481	481	$ 310		310
Net income		3,579																							1,599			1,598								1,598		1
Contribution from parent																																												325		325				325	325
Other comprehensive income (loss), net of tax		(56)	[1]							(65)		(8)		7		(66)		10		1				1	4					3				1		4					(1)		(1)
Stock issuances																																																					$ 68		$ 68	$ 68
Distributions/Dividends to parent		(3,008)						(3,008)								(3,008)				(600)		(600)			(700)			(700)								(700)				(700)									(250)
Sale of noncontrolling interest	[9]	999				545										545		454
Contribution from noncontrolling interest	[4]	550																550
Distributions to noncontrolling interest in subsidiaries		(66)																(66)							(1)													(1)
Other		(8)				(9)										(9)		1							5		6									6		(1)								(1)	1		1	(1)		(1)
Ending Balance (parent) at Dec. 31, 2021		51,136		$ 1,962	$ 1	$ 44,371		$ 3,265		$ (232)		$ (2)		$ (69)		$ 49,296		$ 1,840							17,148		$ 9,149	$ 8,007		$ (2)		$ (2)		$ (7)		$ 17,145		$ 3
Ending Member's Equity at Dec. 31, 2021																				$ 13,891		$ 13,897		$ (6)															$ 9,551	$ 9,551	$ 8,295	$ 8,298	$ (3)					$ 5,015	$ 5,015
Ending Balance (Attributable to Parent) at Dec. 31, 2021		$ 49,296																							$ 17,145																			$ 4,464	$ 762	$ 3,100	$ 602			$ 3,349	$ 1,635	$ 1,714
Balance (in shares) at Dec. 31, 2021		769,000,000																							100																			90,000,000						100				769,000,000
[1]	Net of income tax impacts of approximately $17 million and $35 million for the years ended December 31, 2021, and 2020, respectively. Tax impacts are immaterial for other periods presented.
[2]	Duke Energy issued 40 million depositary shares of preferred stock, Series A, in the first quarter of 2019 and 1 million shares of preferred stock, Series B, in the third quarter of 2019.
[3]	Relates to the sale of a noncontrolling interest in the Commercial Renewables segment. See Note 1 for additional discussion of the transaction.
[4]	Relates to tax equity financing activity in the Commercial Renewables segment.
[5]	Amounts in Retained Earnings and AOCI primarily represent impacts to accumulated other comprehensive income due to implementation of a new accounting standard related to Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income.
[6]	Amounts in Retained Earnings and AOCI primarily represent impacts to accumulated other comprehensive income due to implementation of a new accounting standard related to Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income.
[7]	Amounts in Retained earnings primarily represent impacts due to implementation of a new accounting standard related to Current Estimated Credit Losses. See Note 1 for additional discussion.
[8]	Amounts primarily represent impacts due to implementation of a new accounting standard related to Credit Losses. See Note 1 for additional discussion.
[9]	Relates to the sale of a noncontrolling interest in Duke Energy Indiana. See Note 1 for additional discussion

Consolidated Statements of Equi

Consolidated Statements of Equity (Parentheticals) - Preferred Stock - shares shares in Millions	3 Months Ended
	Sep. 30, 2019	Mar. 31, 2019
Series A Preferred Stock
Stock issuances (in shares)		40
Series B Preferred Stock
Stock issuances (in shares)	1

Summary of Significant Accounti

Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2021
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Index to Combined Notes To Consolidated Financial Statements The notes to the consolidated financial statements are a combined presentation. The following table indicates the registrants to which the notes apply. Applicable Notes Registrant 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 Duke Energy • • • • • • • • • • • • • • • • • • • • • • • • Duke Energy Carolinas • • • • • • • • • • • • • • • • • • • • • • Progress Energy • • • • • • • • • • • • • • • • • • • • • Duke Energy Progress • • • • • • • • • • • • • • • • • • • • • Duke Energy Florida • • • • • • • • • • • • • • • • • • • • • Duke Energy Ohio • • • • • • • • • • • • • • • • • • • • Duke Energy Indiana • • • • • • • • • • • • • • • • • • • • • • Piedmont • • • • • • • • • • • • • • • • • • • • Tables within the notes may not sum across due to (i) Progress Energy's consolidation of Duke Energy Progress, Duke Energy Florida and other subsidiaries that are not registrants and (ii) subsidiaries that are not registrants but included in the consolidated Duke Energy balances. Nature of Operations and Basis of Consolidation Duke Energy is an energy company headquartered in Charlotte, North Carolina, subject to regulation by the FERC and other regulatory agencies listed below. Duke Energy operates in the U.S. primarily through its direct and indirect subsidiaries. Certain Duke Energy subsidiaries are also subsidiary registrants, including Duke Energy Carolinas; Progress Energy; Duke Energy Progress; Duke Energy Florida; Duke Energy Ohio; Duke Energy Indiana and Piedmont. When discussing Duke Energy’s consolidated financial information, it necessarily includes the results of its separate Subsidiary Registrants, which along with Duke Energy, are collectively referred to as the Duke Energy Registrants. The information in these combined notes relates to each of the Duke Energy Registrants as noted in the Index to Combined Notes to Consolidated Financial Statements. However, none of the Subsidiary Registrants make any representation as to information related solely to Duke Energy or the Subsidiary Registrants of Duke Energy other than itself. These Consolidated Financial Statements include, after eliminating intercompany transactions and balances, the accounts of the Duke Energy Registrants and subsidiaries or VIEs where the respective Duke Energy Registrants have control. See Note 17 for additional information on VIEs. These Consolidated Financial Statements also reflect the Duke Energy Registrants’ proportionate share of certain jointly owned generation and transmission facilities. See Note 8 for additional information on joint ownership. Substantially all of the Subsidiary Registrants' operations qualify for regulatory accounting. Duke Energy Carolinas is a regulated public utility primarily engaged in the generation, transmission, distribution and sale of electricity in portions of North Carolina and South Carolina. Duke Energy Carolinas is subject to the regulatory provisions of the NCUC, PSCSC, NRC and FERC. Progress Energy is a public utility holding company, which conducts operations through its wholly owned subsidiaries, Duke Energy Progress and Duke Energy Florida. Progress Energy is subject to regulation by FERC and other regulatory agencies listed below. Duke Energy Progress is a regulated public utility primarily engaged in the generation, transmission, distribution and sale of electricity in portions of North Carolina and South Carolina. Duke Energy Progress is subject to the regulatory provisions of the NCUC, PSCSC, NRC and FERC. Duke Energy Florida is a regulated public utility primarily engaged in the generation, transmission, distribution and sale of electricity in portions of Florida. Duke Energy Florida is subject to the regulatory provisions of the FPSC, NRC and FERC. Duke Energy Ohio is a regulated public utility primarily engaged in the transmission and distribution of electricity in portions of Ohio and Kentucky, the generation and sale of electricity in portions of Kentucky and the transportation and sale of natural gas in portions of Ohio and Kentucky. Duke Energy Ohio conducts competitive auctions for retail electricity supply in Ohio whereby the energy price is recovered from retail customers and recorded in Operating Revenues on the Consolidated Statements of Operations and Comprehensive Income. Operations in Kentucky are conducted through its wholly owned subsidiary, Duke Energy Kentucky. References herein to Duke Energy Ohio collectively include Duke Energy Ohio and its subsidiaries, unless otherwise noted. Duke Energy Ohio is subject to the regulatory provisions of the PUCO, KPSC and FERC. Duke Energy Indiana is a regulated public utility primarily engaged in the generation, transmission, distribution and sale of electricity in portions of Indiana. Duke Energy Indiana is subject to the regulatory provisions of the IURC and FERC. Piedmont is a regulated public utility primarily engaged in the distribution of natural gas in portions of North Carolina, South Carolina and Tennessee. Piedmont is subject to the regulatory provisions of the NCUC, PSCSC, TPUC and FERC. Certain prior year amounts have been reclassified to conform to the current year presentation. Other Current Assets and Liabilities The following table provides a description of amounts included in Other within Current Assets or Current Liabilities that exceed 5% of total Current Assets or Current Liabilities on the Duke Energy Registrants' Consolidated Balance Sheets at either December 31, 2021, or 2020. December 31, (in millions) Location 2021 2020 Duke Energy Accrued compensation Current Liabilities $ 915 $ 662 Other accrued liabilities Current Liabilities 649 1,455 Duke Energy Carolinas Accrued compensation Current Liabilities $ 277 $ 213 Duke Energy Progress Customer deposits Current Liabilities $ 144 $ 144 Other accrued liabilities Current Liabilities 163 132 Duke Energy Florida Customer deposits Current Liabilities $ 200 $ 203 Other accrued liabilities Current Liabilities 89 81 Duke Energy Ohio Gas Storage Current Assets $ 25 $ 21 Collateral liabilities Current Liabilities 57 41 Discontinued Operations Duke Energy has elected to present cash flows of discontinued operations combined with cash flows of continuing operations. Unless otherwise noted, the notes to these consolidated financial statements exclude amounts related to discontinued operations for all periods presented. For the years ended December 31, 2021, 2020 and 2019, the Income (Loss) From Discontinued Operations, net of tax on Duke Energy's Consolidated Statements of Operations is entirely attributable to controlling interest. Noncontrolling Interest Duke Energy maintains a controlling financial interest in certain less than wholly owned nonregulated subsidiaries. As a result, Duke Energy consolidates these subsidiaries and presents the third-party investors' portion of Duke Energy's net income (loss), net assets and comprehensive income (loss) as noncontrolling interest. Noncontrolling interest is included as a component of equity on the Consolidated Balance Sheet. Several operating agreements of Duke Energy's subsidiaries with noncontrolling interest are subject to allocations of tax attributes and cash flows in accordance with contractual agreements that vary throughout the lives of the subsidiaries. Therefore, Duke Energy and the other investors' (the owners) interests in the subsidiaries are not fixed, and the subsidiaries apply the HLBV method in allocating income or loss and other comprehensive income or loss (all measured on a pretax basis) to the owners. The HLBV method measures the amounts that each owner would hypothetically claim at each balance sheet reporting date, including tax benefits realized by the owners, most of which is over the IRS recapture period, upon a hypothetical liquidation of the subsidiary at the net book value of its underlying assets. The change in the amount that each owner would hypothetically receive at the reporting date compared to the amount it would have received on the previous reporting date represents the amount of income or loss allocated to each owner for the reporting period. Other operating agreements of Duke Energy's subsidiaries with noncontrolling interest allocate profit and loss based on their pro rata shares of the ownership interest in the respective subsidiary. Therefore, Duke Energy allocates net income or loss and other comprehensive income or loss of these subsidiaries to the owners based on their pro rata shares. In 2019, Duke Energy completed a sale of minority interest in a portion of certain renewable assets within the Commercial Renewables Segment for pretax proceeds to Duke Energy of $415 million. The portion of Duke Energy's commercial renewables energy portfolio sold includes 49% of 37 operating wind, solar and battery storage assets and 33% of 11 operating solar assets across the U.S. Duke Energy retained control of these assets, and, therefore, no gain or loss was recognized on the Consolidated Statements of Operations. The difference between the consideration received and the carrying value of the noncontrolling interest claim on net assets was $466 million, net of tax benefit of $8 million, and was recorded to equity. The following table presents allocated losses to noncontrolling interest for the years ended December 31, 2021, 2020 and 2019. December 31, (in millions) 2021 2020 2019 Noncontrolling Interest Allocation of Income Allocated losses to noncontrolling tax equity members utilizing the HLBV method $ 298 $ 271 $ 165 Allocated losses to noncontrolling members based on pro rata shares of ownership 31 24 12 Total Noncontrolling Interest Allocated Losses $ 329 $ 295 $ 177 2021 Sale of Minority Interest in Duke Energy Indiana On January 28, 2021, Duke Energy executed an agreement providing for an investment by an affiliate of GIC in Duke Energy Indiana in exchange for a 19.9% minority interest issued by Duke Energy Indiana Holdco, LLC, the holding company for Duke Energy Indiana. The transaction will be completed following two closings for an aggregate purchase price of approximately $2 billion. The first closing, which occurred on September 8, 2021, resulted in Duke Energy Indiana Holdco, LLC issuing 11.05% of its membership interests in exchange for approximately $1,025 million or 50% of the purchase price. Duke Energy retained indirect control of these assets, and, therefore, no gain or loss was recognized on the Consolidated Statements of Operations. The difference between the cash consideration received, net of transaction costs of approximately $27 million, and the carrying value of the noncontrolling interest is $545 million and was recorded as an increase to equity. Under the terms of the agreement, Duke Energy has the discretion to determine the timing of the second closing, but it will occur no later than January 2023. At the second closing, Duke Energy will issue and sell additional membership interests such that GIC will own 19.9% of the membership interests for the remaining 50% of the purchase price. Acquisitions The Duke Energy Registrants consolidate assets and liabilities from acquisitions as of the purchase date and include earnings from acquisitions in consolidated earnings after the purchase date. Significant Accounting Policies Use of Estimates In preparing financial statements that conform to GAAP, the Duke Energy Registrants must make estimates and assumptions that affect the reported amounts of assets and liabilities, the reported amounts of revenues and expenses and the disclosure of contingent assets and liabilities at the date of the financial statements. Actual results could differ from those estimates. Regulatory Accounting The majority of the Duke Energy Registrants’ operations are subject to price regulation for the sale of electricity and natural gas by state utility commissions or FERC. When prices are set on the basis of specific costs of the regulated operations and an effective franchise is in place such that sufficient natural gas or electric services can be sold to recover those costs, the Duke Energy Registrants apply regulatory accounting. Regulatory accounting changes the timing of the recognition of costs or revenues relative to a company that does not apply regulatory accounting. As a result, regulatory assets and regulatory liabilities are recognized on the Consolidated Balance Sheets. Regulatory assets and liabilities are amortized consistent with the treatment of the related cost in the ratemaking process. Regulatory assets are reviewed for recoverability each reporting period. If a regulatory asset is no longer deemed probable of recovery, the deferred cost is charged to earnings. See Note 3 for further information. Regulatory accounting rules also require recognition of a disallowance (also called "impairment") loss if it becomes probable that part of the cost of a plant under construction (or a recently completed plant or an abandoned plant) will be disallowed for ratemaking purposes and a reasonable estimate of the amount of the disallowance can be made. For example, if a cost cap is set for a plant still under construction, the amount of the disallowance is a result of a judgment as to the ultimate cost of the plant. These disallowances can require judgments on allowed future rate recovery. When it becomes probable that regulated generation, transmission or distribution assets will be abandoned, the cost of the asset is removed from plant in service. The value that may be retained as a regulatory asset on the balance sheet for the abandoned property is dependent upon amounts that may be recovered through regulated rates, including any return. As such, an impairment charge could be partially or fully offset by the establishment of a regulatory asset if rate recovery is probable. The impairment charge for a disallowance of costs for regulated plants under construction, recently completed or abandoned is based on discounted cash flows. The Duke Energy Registrants utilize cost-tracking mechanisms, commonly referred to as fuel adjustment clauses or PGA clauses. These clauses allow for the recovery of fuel and fuel-related costs, portions of purchased power, natural gas costs and hedging costs through surcharges on customer rates. The difference between the costs incurred and the surcharge revenues is recorded either as an adjustment to Operating Revenues, Operating Expenses – Fuel used in electric generation or Operating Expenses – Cost of natural gas on the Consolidated Statements of Operations, with an off-setting impact on regulatory assets or liabilities. Cash, Cash Equivalents and Restricted Cash All highly liquid investments with maturities of three months or less at the date of acquisition are considered cash equivalents. Duke Energy, Progress Energy and Duke Energy Florida have restricted cash balances related primarily to collateral assets, escrow deposits and VIEs. Duke Energy Carolinas and Duke Energy Progress have restricted cash balances related to VIEs from storm recovery bonds issued in 2021. See Note 17 for additional information. Restricted cash amounts are included in Other within Current Assets and Other Noncurrent Assets on the Consolidated Balance Sheets. The following table presents the components of cash, cash equivalents and restricted cash included in the Consolidated Balance Sheets. December 31, 2021 Duke Duke Duke Duke Energy Progress Energy Energy Energy Carolinas Energy Progress Florida Current Assets Cash and cash equivalents $ 343 $ 7 $ 70 $ 35 $ 23 Other 170 — 39 — 39 Other Noncurrent Assets Other 7 1 4 4 — Total cash, cash equivalents and restricted cash $ 520 $ 8 $ 113 $ 39 $ 62 December 31, 2020 Duke Duke Duke Duke Energy Progress Energy Energy Energy Carolinas Energy Progress Florida Current Assets Cash and cash equivalents $ 259 $ 21 $ 59 $ 39 $ 11 Other 194 — 39 — 39 Other Noncurrent Assets Other 103 — 102 — — Total cash, cash equivalents and restricted cash $ 556 $ 21 $ 200 $ 39 $ 50 Inventory Inventory related to regulated operations is valued at historical cost. Inventory related to nonregulated operations is valued at the lower of cost or market. Inventory is charged to expense or capitalized to property, plant and equipment when issued, primarily using the average cost method. Excess or obsolete inventory is written down to the lower of cost or net realizable value. Once inventory has been written down, it creates a new cost basis for the inventory that is not subsequently written up. Provisions for inventory write-offs were not material at December 31, 2021, and 2020, respectively. The components of inventory are presented in the tables below. December 31, 2021 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Materials and supplies $ 2,397 $ 793 $ 1,067 $ 729 $ 338 $ 80 $ 311 $ 14 Coal 486 195 167 94 73 19 105 — Natural gas, oil and other 316 38 164 98 66 17 2 95 Total inventory $ 3,199 $ 1,026 $ 1,398 $ 921 $ 477 $ 116 $ 418 $ 109 December 31, 2020 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Materials and supplies $ 2,312 $ 785 $ 999 $ 673 $ 325 $ 78 $ 307 $ 12 Coal 561 186 193 131 63 16 165 — Natural gas, oil and other 294 39 183 107 76 16 1 56 Total inventory $ 3,167 $ 1,010 $ 1,375 $ 911 $ 464 $ 110 $ 473 $ 68 Investments in Debt and Equity Securities The Duke Energy Registrants classify investments in equity securities as FV-NI and investments in debt securities as AFS. Both categories are recorded at fair value on the Consolidated Balance Sheets. Realized and unrealized gains and losses on securities classified as FV-NI are reported through net income. Unrealized gains and losses for debt securities classified as AFS are included in AOCI until realized, unless it is determined the carrying value of an investment has a credit loss. For certain investments of regulated operations, such as substantially all of the NDTF, realized and unrealized gains and losses (including any credit losses) on debt securities are recorded as a regulatory asset or liability. The credit loss portion of debt securities of nonregulated operations are included in earnings. Investments in debt and equity securities are classified as either current or noncurrent based on management’s intent and ability to sell these securities, taking into consideration current market liquidity. See Note 15 for further information. Goodwill Duke Energy, Progress Energy, Duke Energy Ohio and Piedmont perform annual goodwill impairment tests as of August 31 each year at the reporting unit level, which is determined to be a business segment or one level below. Duke Energy, Progress Energy, Duke Energy Ohio and Piedmont update these tests between annual tests if events or circumstances occur that would more likely than not reduce the fair value of a reporting unit below its carrying value. See Note 11 for further information. Intangible Assets Intangible assets are included in Other in Other Noncurrent Assets on the Consolidated Balance Sheets. Generally, intangible assets are amortized using an amortization method that reflects the pattern in which the economic benefits of the intangible asset are consumed or on a straight-line basis if that pattern is not readily determinable. Amortization of intangibles is reflected in Depreciation and amortization on the Consolidated Statements of Operations. Intangible assets are subject to impairment testing and if impaired, the carrying value is accordingly reduced. RECs are used to measure compliance with renewable energy standards and are held primarily for consumption. See Note 11 for further information. Long-Lived Asset Impairments The Duke Energy Registrants evaluate long-lived assets, excluding goodwill, for impairment when circumstances indicate the carrying value of those assets may not be recoverable. An impairment exists when a long-lived asset’s carrying value exceeds the estimated undiscounted cash flows expected to result from the use and eventual disposition of the asset. The estimated cash flows may be based on alternative expected outcomes that are probability weighted. If the carrying value of the long-lived asset is not recoverable based on these estimated future undiscounted cash flows, the carrying value of the asset is written down to its then current estimated fair value and an impairment charge is recognized. The Duke Energy Registrants assess fair value of long-lived assets using various methods, including recent comparable third-party sales, internally developed discounted cash flow analysis and analysis from outside advisors. Triggering events to reassess cash flows may include, but are not limited to, significant changes in commodity prices, the condition of an asset or management’s interest in selling the asset. Equity Method Investment Impairments Investments in affiliates that are not controlled by Duke Energy, but over which it has significant influence, are accounted for using the equity method. Equity method investments are assessed for impairment whenever events or changes in circumstances indicate that the carrying amount of the investment may not be recoverable. If the decline in value is considered to be other than temporary, the investment is written down to its estimated fair value, which establishes a new cost basis in the investment. Impairment assessments use a discounted cash flow income approach and include consideration of the severity and duration of any decline in the fair value of the investments. The estimated cash flows may be based on alternative expected outcomes that are probability weighted. Key inputs that involve estimates and significant management judgment include cash flow projections, selection of a discount rate, probability weighting of potential outcomes, and whether any decline in value is considered temporary. Property, Plant and Equipment Property, plant and equipment are stated at the lower of depreciated historical cost net of any disallowances or fair value, if impaired. The Duke Energy Registrants capitalize all construction-related direct labor and material costs, as well as indirect construction costs such as general engineering, taxes and financing costs. See “Allowance for Funds Used During Construction and Interest Capitalized” section below for information on capitalized financing costs. Costs of renewals and betterments that extend the useful life of property, plant and equipment are also capitalized. The cost of repairs, replacements and major maintenance projects, which do not extend the useful life or increase the expected output of the asset, are expensed as incurred. Depreciation is generally computed over the estimated useful life of the asset using the composite straight-line method. Depreciation studies are conducted periodically to update composite rates and are approved by state utility commissions and/or the FERC when required. The composite weighted average depreciation rates, excluding nuclear fuel, are included in the table that follows. Years Ended December 31, 2021 2020 2019 Duke Energy 2.9 % 3.0 % 3.1 % Duke Energy Carolinas 2.7 % 2.8 % 2.8 % Progress Energy 3.1 % 3.2 % 3.1 % Duke Energy Progress 3.0 % 3.1 % 3.1 % Duke Energy Florida 3.3 % 3.3 % 3.1 % Duke Energy Ohio 2.9 % 2.9 % 2.6 % Duke Energy Indiana 3.6 % 3.5 % 3.3 % Piedmont 2.1 % 2.3 % 2.4 % In general, when the Duke Energy Registrants retire regulated property, plant and equipment, the original cost plus the cost of retirement, less salvage value and any depreciation already recognized, is charged to accumulated depreciation. However, when it becomes probable the asset will be retired substantially in advance of its original expected useful life or is abandoned, the cost of the asset and the corresponding accumulated depreciation is recognized as a separate asset. If the asset is still in operation, the net amount is classified as Facilities to be retired, net on the Consolidated Balance Sheets. If the asset is no longer operating, the net amount is classified in Regulatory assets on the Consolidated Balance Sheets if deemed recoverable (see discussion of long-lived asset impairments above). The carrying value of the asset is based on historical cost if the Duke Energy Registrants are allowed to recover the remaining net book value and a return equal to at least the incremental borrowing rate. If not, an impairment is recognized to the extent the net book value of the asset exceeds the present value of future revenues discounted at the incremental borrowing rate. When the Duke Energy Registrants sell entire regulated operating units, or retire or sell nonregulated properties, the original cost and accumulated depreciation and amortization balances are removed from Property, Plant and Equipment on the Consolidated Balance Sheets. Any gain or loss is recorded in earnings, unless otherwise required by the applicable regulatory body. See Note 10 for additional information. Leases Duke Energy determines if an arrangement is a lease at contract inception based on whether the arrangement involves the use of a physically distinct identified asset and whether Duke Energy has the right to obtain substantially all of the economic benefits from the use of the asset throughout the period as well as the right to direct the use of the asset. As a policy election, Duke Energy does not evaluate arrangements with initial contract terms of less than one year as leases. Operating leases are included in Operating lease ROU assets, net, Other current liabilities and Operating lease liabilities on the Consolidated Balance Sheets. Finance leases are included in Property, plant and equipment, Current maturities of long-term debt and Long-Term Debt on the Consolidated Balance Sheets. For lessee and lessor arrangements, Duke Energy has elected a policy to not separate lease and non-lease components for all asset classes. For lessor arrangements, lease and non-lease components are only combined under one arrangement and accounted for under the lease accounting framework if the non-lease components are not the predominant component of the arrangement and the lease component would be classified as an operating lease. Nuclear Fuel Nuclear fuel is classified as Property, Plant and Equipment on the Consolidated Balance Sheets. Nuclear fuel in the front-end fuel processing phase is considered work in progress and not amortized until placed in service. Amortization of nuclear fuel is included within Fuel used in electric generation and purchased power on the Consolidated Statements of Operations. Amortization is recorded using the units-of-production method. Allowance for Funds Used During Construction and Interest Capitalized For regulated operations, the debt and equity costs of financing the construction of property, plant and equipment are reflected as AFUDC and capitalized as a component of the cost of property, plant and equipment. AFUDC equity is reported on the Consolidated Statements of Operations as non-cash income in Other income and expenses, net. AFUDC debt is reported as a non-cash offset to Interest Expense. After construction is completed, the Duke Energy Registrants are permitted to recover these costs through their inclusion in rate base and the corresponding subsequent depreciation or amortization of those regulated assets. AFUDC equity, a permanent difference for income taxes, reduces the ETR when capitalized and increases the ETR when depreciated or amortized. See Note 23 for additional information. For nonregulated operations, interest is capitalized during the construction phase with an offsetting non-cash credit to Interest Expense on the Consolidated Statements of Operations. Asset Retirement Obligations AROs are recognized for legal obligations associated with the retirement of property, plant and equipment. Substantially all AROs are related to regulated operations. When recording an ARO, the present value of the projected liability is recognized in the period in which it is incurred, if a reasonable estimate of fair value can be made. The liability is accreted over time. For operating plants, the present value of the liability is added to the cost of the associated asset and depreciated over the remaining life of the asset. For retired plants, the present value of the liability is recorded as a regulatory asset unless determined not to be probable of recovery. The present value of the initial obligation and subsequent updates are based on discounted cash flows, which include estimates regarding timing of future cash flows, selection of discount rates and cost escalation rates, among other factors. These estimates are subject to change. Depreciation expense is adjusted prospectively for any changes to the carrying amount of the associated asset. The Duke Energy Registrants receive amounts to fund the cost of the ARO for regulated operations through a combination of regulated revenues and earnings on the NDTF. As a result, amounts recovered in regulated revenues, earnings on the NDTF, accretion expense and depreciation of the associated asset are netted and deferred as a regulatory asset or liability. Accounts Payable During 2020, Duke Energy established a supply chain finance program (the “program”) with a global financial institution. The program is voluntary and allows Duke Energy suppliers, at their sole discretion, to sell their receivables from Duke Energy to the financial institution at a rate that leverages Duke Energy’s credit rating and, which may result in favorable terms compared to the rate available to the supplier on their own credit rating. Suppliers participating in the program, determine at their sole discretion which invoices they will sell to the financial institution. Suppliers’ decisions on which invoices are sold do not impact Duke Energy’s payment terms, which are based on commercial terms negotiated between Duke Energy and the supplier regardless of program participation. The commercial terms negotiated between Duke Energy and its suppliers are consistent regardless of whether the supplier elects to participate in the program. Duke Energy does not issue any guarantees with respect to the program and does not participate in negotiations between suppliers and the financial institution. Duke Energy does not have an economic interest in the supplier’s decision to participate in the program and receives no interest, fees or other benefit from the financial institution based on supplier participation in the program. The following table presents the outstanding accounts payable balance sold to the financial institution by our suppliers and the supplier invoices sold to the financial institution under the program included within Net cash provided by operating activities on the Consolidated Statements of Cash Flows as of December 31, 2021, and December 31, 2020. December 31, 2021 December 30, 2020 Duke Duke Duke Duke Progress Energy Energy Duke Energy (in millions) Energy Energy Florida Ohio Piedmont Energy Ohio Piedmont Outstanding Accounts Payable Balance Sold $ 19 $ 9 $ 9 $ 6 $ 4 $ 15 $ 1 $ 14 Suppliers Invoices Settled Through The Program 122 10 10 12 100 45 9 36 Revenue Recognition Duke Energy recognizes revenue as customers obtain control of promised goods and services in an amount that reflects consideration expected in exchange for those goods or services. Generally, the delivery of electricity and natural gas results in the transfer of control to customers at the time the commodity is delivered and the amount of revenue recognized is equal to the amount billed to each customer, including estimated volumes delivered when billings have not yet occurred. See Note 18 for further information. Derivatives and Hedging Derivative and non-derivative instruments may be used in connection with commodity price and interest rate activities, including swaps, futures, forwards and options. All derivative instruments, except those that qualify for the NPNS exception, are recorded on the Consolidated Balance Sheets at fair value. Qualifying derivative instruments may be designated as either cash flow hedges or fair value hedges. Other derivative instruments (undesignated contracts) either have not been designated or do not qualify as hedges. The effective portion of the change in the fair value of cash flow hedges is recorded in AOCI. The effective portion of the change in the fair value of a fair value hedge is offset in net income by changes in the hedged item. For activity subject to re

Business Segments

Business Segments	12 Months Ended
	Dec. 31, 2021
Segment Reporting [Abstract]
Business Segments	BUSINESS SEGMENTS Reportable segments are determined based on information used by the chief operating decision-maker in deciding how to allocate resources and evaluate the performance of the business. Duke Energy evaluates segment performance based on segment income. Segment income is defined as income from continuing operations net of income attributable to noncontrolling interests and preferred stock dividends. Segment income, as discussed below, includes intercompany revenues and expenses that are eliminated on the Consolidated Financial Statements. Certain governance costs are allocated to each segment. In addition, direct interest expense and income taxes are included in segment income. Products and services are sold between affiliate companies and reportable segments of Duke Energy at cost. Segment assets as presented in the tables that follow exclude all intercompany assets. Duke Energy Duke Energy's segment structure includes the following segments: Electric Utilities and Infrastructure, Gas Utilities and Infrastructure and Commercial Renewables. The Electric Utilities and Infrastructure segment includes Duke Energy's regulated electric utilities in the Carolinas, Florida and the Midwest. The regulated electric utilities conduct operations through the Subsidiary Registrants that are substantially all regulated and, accordingly, qualify for regulatory accounting treatment. Electric Utilities and Infrastructure also includes Duke Energy's electric transmission infrastructure investments. The Gas Utilities and Infrastructure segment includes Piedmont, Duke Energy's natural gas local distribution companies in Ohio and Kentucky, and Duke Energy's natural gas storage and midstream pipeline investments. Gas Utilities and Infrastructure's operations are substantially all regulated and, accordingly, qualify for regulatory accounting treatment. The Commercial Renewables segment is primarily comprised of nonregulated utility-scale wind and solar generation assets located throughout the U.S. The remainder of Duke Energy’s operations is presented as Other, which is primarily comprised of interest expense on holding company debt, unallocated corporate costs and Duke Energy’s wholly owned captive insurance company, Bison. Other also includes Duke Energy's interest in NMC. See Note 12 for additional information on the investment in NMC. Business segment information is presented in the following tables. Segment assets presented exclude intercompany assets. Year Ended December 31, 2021 Electric Gas Total Utilities and Utilities and Commercial Reportable (in millions) Infrastructure Infrastructure Renewables Segments Other Eliminations Total Unaffiliated Revenues $ 22,570 $ 2,022 $ 476 $ 25,068 $ 29 $ — $ 25,097 Intersegment Revenues 33 90 — 123 82 (205) — Total Revenues $ 22,603 $ 2,112 $ 476 $ 25,191 $ 111 $ (205) $ 25,097 Interest Expense $ 1,432 $ 142 $ 72 $ 1,646 $ 643 $ (9) $ 2,280 Depreciation and amortization 4,251 303 225 4,779 237 (26) 4,990 Equity in earnings (losses) of unconsolidated affiliates 7 8 (34) (19) 47 — 28 Income tax expense (benefit) 494 55 (78) 471 (279) — 192 Segment income (loss) (a)(b)(c)(d) 3,850 396 201 4,447 (652) — 3,795 Less noncontrolling interest 329 Add back preferred stock dividend 106 Income from discontinued operations, net of tax 7 Net income $ 3,579 Capital investments expenditures and acquisitions $ 7,653 $ 1,271 $ 543 $ 9,467 $ 285 $ — $ 9,752 Segment assets 143,841 15,179 6,977 165,997 3,590 — 169,587 (a) Electric Utilities and Infrastructure includes $160 million of expense recorded within Impairment of assets and other charges, $77 million of income within Other Income and expenses, $5 million of expense within Operations, maintenance and other, $13 million of income within regulated operating revenues, $3 million of expense within interest expense and $6 million of expense within Depreciation and amortization on the Duke Energy Carolinas' Consolidated Statement of Operations related to the South Carolina Supreme Court decision on coal ash and insurance proceeds; it also includes $42 million of expense recorded within Impairment of assets and other charges, $34 million of income within Other Income and expenses, $7 million of expense within Operations, maintenance, and other, $15 million of income within Regulated electric operating revenues, $5 million of expense wit hin interest expense and $1 million of expense within Depreciation and amortization on the Duke Energy Progress' Consolidated Statement of Operations. See Notes 3 and 4 for more information. (b) Gas Utilities and Infrastructure includes $20 million, recorded within Equity in earnings (losses) of unconsolidated affiliates on the Consolidated Statements of Operations, related to natural gas pipeline investments. See Note 3 for additional information. (c) Commercial Renewables includes a $35 million loss related to Texas Storm Uri of which ($8 million) is recorded within Nonregulated electric and other revenues, $2 million within Operations, maintenance and other, $29 million within Equity in earnings (losses) of unconsolidated affiliates and $12 million within Loss Attributable to Noncontrolling Interests on the Consolidated Statements of Operations. See Note 4 for additional information. (d) Other includes $133 million recorded within Impairment of assets and other charges, $42 million within Operations, maintenance and other, and $17 million within Depreciation and amortization on the Consolidated Statements of Operations, related to the workplace and workplace realignment. See Note 10 for additional information. Year Ended December 31, 2020 Electric Gas Total Utilities and Utilities and Commercial Reportable (in millions) Infrastructure Infrastructure Renewables Segments Other Eliminations Total Unaffiliated Revenues $ 21,687 $ 1,653 $ 502 $ 23,842 $ 26 $ — $ 23,868 Intersegment Revenues 33 95 — 128 71 (199) — Total Revenues $ 21,720 $ 1,748 $ 502 $ 23,970 $ 97 $ (199) $ 23,868 Interest Expense $ 1,320 $ 135 $ 66 $ 1,521 $ 657 $ (16) $ 2,162 Depreciation and amortization 4,068 258 199 4,525 209 (29) 4,705 Equity in earnings (losses) of unconsolidated affiliates (1) (2,017) — (2,018) 13 — (2,005) Income tax expense (benefit) 340 (349) (65) (74) (162) — (236) Segment income (loss) (a)(b)(c) 2,669 (1,266) 286 1,689 (426) — 1,263 Less noncontrolling interest 295 Add back preferred stock dividend 107 Income from discontinued operations, net of tax 7 Net income $ 1,082 Capital investments expenditures and acquisitions $ 7,629 $ 1,309 $ 1,219 $ 10,157 $ 264 $ — $ 10,421 Segment assets 138,225 13,849 6,716 158,790 3,598 — 162,388 (a) Electric Utilities and Infrastructure includes $948 million of Impairment of assets and other charges and a reversal of $152 million included in Regulated electric operating revenue related to the CCR Settlement Agreement filed with the NCUC. Additionally, Electric Utilities and Infrastructure includes $19 million of Impairment of assets and other charges related to the Clemson University Combined Heat and Power Plant, $5 million of Impairment charges related to the natural gas pipeline assets and $16 million of shareholder contributions within Operations, maintenance and other related to Duke Energy Carolinas' and Duke Energy Progress' 2019 North Carolina rate cases. See Note 3 for additional information. (b) Gas Utilities and Infrastructure includes $2.1 billion recorded within Equity in (losses) earnings of unconsolidated affiliates and $7 million of Impairment of assets and other charges related to natural gas pipeline investments. See Notes 3 and 12 for additional information. (c) Other includes a $98 million reversal of 2018 severance costs due to a partial settlement in the Duke Energy Carolinas' 2019 North Carolina rate case. See Note 20 for additional information. Year Ended December 31, 2019 Electric Gas Total Utilities and Utilities and Commercial Reportable (in millions) Infrastructure Infrastructure Renewables Segments Other Eliminations Total Unaffiliated Revenues $ 22,798 $ 1,770 $ 487 $ 25,055 $ 24 $ — $ 25,079 Intersegment Revenues 33 96 — 129 71 (200) — Total Revenues $ 22,831 $ 1,866 $ 487 $ 25,184 $ 95 $ (200) $ 25,079 Interest Expense $ 1,345 $ 117 $ 95 $ 1,557 $ 705 $ (58) $ 2,204 Depreciation and amortization 3,951 256 168 4,375 178 (5) 4,548 Equity in earnings (losses) of unconsolidated affiliates 9 114 (4) 119 43 — 162 Income tax expense (benefit) 785 22 (115) 692 (173) — 519 Segment income (loss) (a)(b) 3,536 432 198 4,166 (452) — 3,714 Less noncontrolling interest 177 Add back preferred stock dividend 41 Loss from discontinued operations, net of tax (7) Net income $ 3,571 Capital investments expenditures and acquisitions $ 8,263 $ 1,539 $ 1,423 $ 11,225 $ 221 $ — $ 11,446 Segment assets 135,561 13,921 6,020 155,502 3,148 188 158,838 (a) Electric Utilities and Infrastructure includes a $27 million reduction of a prior year impairment at Citrus County CC related to the plant's cost cap. (b) Gas Utilities and Infrastructure includes an after-tax impairment charge of $19 million for the remaining investment in Constitution. See Note 12 for additional information. Geographical Information Substantially all assets and revenues from continuing operations are within the U.S. Major Customers For the year ended December 31, 2021, revenues from one customer of Duke Energy Progress are $586 million. Duke Energy Progress has one reportable segment, Electric Utilities and Infrastructure. No other Subsidiary Registrant has an individual customer representing more than 10% of its revenues. Products and Services The following table summarizes revenues of the reportable segments by type. Retail Wholesale Retail Total (in millions) Electric Electric Natural Gas Other Revenues 2021 Electric Utilities and Infrastructure $ 19,410 $ 2,216 $ — $ 977 $ 22,603 Gas Utilities and Infrastructure — — 2,025 87 2,112 Commercial Renewables — 411 — 65 476 Total Reportable Segments $ 19,410 $ 2,627 $ 2,025 $ 1,129 $ 25,191 2020 Electric Utilities and Infrastructure $ 18,898 $ 1,878 $ — $ 944 $ 21,720 Gas Utilities and Infrastructure — — 1,691 57 1,748 Commercial Renewables — 434 — 68 502 Total Reportable Segments $ 18,898 $ 2,312 $ 1,691 $ 1,069 $ 23,970 2019 Electric Utilities and Infrastructure $ 19,745 $ 2,231 $ — $ 855 $ 22,831 Gas Utilities and Infrastructure — — 1,782 84 1,866 Commercial Renewables — 389 — 98 487 Total Reportable Segments $ 19,745 $ 2,620 $ 1,782 $ 1,037 $ 25,184 Duke Energy Ohio Duke Energy Ohio has two reportable segments, Electric Utilities and Infrastructure and Gas Utilities and Infrastructure. Electric Utilities and Infrastructure transmits and distributes electricity in portions of Ohio and generates, distributes and sells electricity in portions of Northern Kentucky. Gas Utilities and Infrastructure transports and sells natural gas in portions of Ohio and Northern Kentucky. Both reportable segments conduct operations primarily through Duke Energy Ohio and its wholly owned subsidiary, Duke Energy Kentucky. The remainder of Duke Energy Ohio's operations is presented as Other. All Duke Energy Ohio assets and revenues from continuing operations are within the U.S. Year Ended December 31, 2021 Electric Gas Total Utilities and Utilities and Reportable (in millions) Infrastructure Infrastructure Segments Other Eliminations Total Total revenues $ 1,493 $ 544 $ 2,037 $ — $ — $ 2,037 Interest expense $ 87 $ 24 $ 111 $ — $ — $ 111 Depreciation and amortization 217 90 307 — — 307 Income tax expense (benefit) 15 19 34 (4) — 30 Segment income (loss)/Net income 141 78 219 (15) — 204 Capital expenditures $ 486 $ 362 $ 848 $ — $ — $ 848 Segment assets 6,882 3,892 10,774 29 (29) 10,774 Year Ended December 31, 2020 Electric Gas Total Utilities and Utilities and Reportable (in millions) Infrastructure Infrastructure Segments Other Eliminations Total Total revenues $ 1,405 $ 453 $ 1,858 $ — $ — $ 1,858 Interest expense $ 85 $ 17 $ 102 $ — $ — $ 102 Depreciation and amortization 200 78 278 — — 278 Income tax expense (benefit) 19 26 45 (2) — 43 Segment income (loss)/Net Income 162 96 258 (6) — 252 Capital expenditures $ 548 $ 286 $ 834 $ — $ — $ 834 Segment assets 6,615 3,380 9,995 32 (2) 10,025 Year Ended December 31, 2019 Electric Gas Total Utilities and Utilities and Reportable (in millions) Infrastructure Infrastructure Segments Other Eliminations Total Total revenues $ 1,456 $ 484 $ 1,940 $ — $ — $ 1,940 Interest expense $ 80 $ 29 $ 109 $ — $ — $ 109 Depreciation and amortization 182 83 265 — — 265 Income tax expense (benefit) 20 21 41 (1) — 40 Segment income (loss) 159 85 244 (5) — 239 Loss from discontinued operations, net of tax (1) Net income $ 238 Capital expenditures $ 680 $ 272 $ 952 $ — $ — $ 952 Segment assets 6,188 3,116 9,304 34 — 9,338

Regulatory Matters

Regulatory Matters	12 Months Ended
	Dec. 31, 2021
Regulated Operations [Abstract]
Regulatory Matters	REGULATORY MATTERS REGULATORY ASSETS AND LIABILITIES The Duke Energy Registrants record regulatory assets and liabilities that result from the ratemaking process. See Note 1 for further information. The following tables present the regulatory assets and liabilities recorded on the Consolidated Balance Sheets of Duke Energy and Progress Energy. See separate tables below for balances by individual registrant. Duke Energy Progress Energy December 31, December 31, (in millions) 2021 2020 2021 2020 Regulatory Assets AROs – coal ash $ 3,408 $ 3,408 $ 1,399 $ 1,357 AROs – nuclear and other 684 754 620 685 Accrued pension and OPEB 2,017 2,317 725 875 Deferred fuel and purchased power 1,253 213 718 162 Storm cost securitized balance, net 991 — 759 — Nuclear asset securitized balance, net 937 991 937 991 Debt fair value adjustment 884 950 — — Retired generation facilities 357 417 265 363 Post-in-service carrying costs (PISCC) and deferred operating expenses 356 397 47 51 Hedge costs deferrals 348 351 137 148 Deferred asset – Lee and Harris COLA 317 356 21 32 Advanced metering infrastructure (AMI) 311 311 130 102 Customer connect project 242 136 124 55 Demand side management (DSM)/Energy efficiency (EE) 235 242 230 241 Vacation accrual 221 221 42 42 Storm cost deferrals 213 1,102 189 893 NCEMPA deferrals 165 124 165 124 CEP deferral 161 117 — — Derivatives – natural gas supply contracts 139 122 — — COR settlement 123 128 32 33 Nuclear deferral 120 123 42 35 Deferred pipeline integrity costs 108 92 — — Costs of removal regulatory asset 107 — 107 — Manufactured gas plant (MGP) 104 104 — — Qualifying facility contract buyouts 94 107 94 107 ABSAT, coal ash basin closure 90 98 23 27 Incremental COVID-19 expenses 87 76 28 23 Amounts due from customers 85 110 — — Deferred severance charges 54 86 18 29 Other 426 609 87 158 Total regulatory assets 14,637 14,062 6,939 6,533 Less: current portion 2,150 1,641 1,030 758 Total noncurrent regulatory assets $ 12,487 $ 12,421 $ 5,909 $ 5,775 Regulatory Liabilities Net regulatory liability related to income taxes $ 7,199 $ 7,368 $ 2,394 $ 2,411 Costs of removal 6,150 5,883 2,955 2,666 AROs – nuclear and other 2,053 1,512 — — Provision for rate refunds 274 344 87 123 Hedge cost deferrals 271 24 117 8 Accrued pension and OPEB 213 177 — — Other 1,203 1,098 491 483 Total regulatory liabilities 17,363 16,406 6,044 5,691 Less: current portion 1,211 1,377 478 640 Total noncurrent regulatory liabilities $ 16,152 $ 15,029 $ 5,566 $ 5,051 Descriptions of regulatory assets and liabilities summarized in the tables above and below follow. See tables below for recovery and amortization periods at the separate registrants. AROs – coal ash. Represents deferred depreciation and accretion related to the legal obligation to close ash basins. The costs are deferred until recovery treatment has been determined. See Notes 1 and 9 for additional information. AROs – nuclear and other. Represents regulatory assets or liabilities, including deferred depreciation and accretion, related to legal obligations associated with the future retirement of property, plant and equipment, excluding amounts related to coal ash. The AROs relate primarily to decommissioning nuclear power facilities. The amounts also include certain deferred gains and losses on NDTF investments. See Notes 1 and 9 for additional information. Accrued pension and OPEB. Accrued pension and OPEB represent regulatory assets and liabilities related to each of the Duke Energy Registrants’ respective shares of unrecognized actuarial gains and losses and unrecognized prior service cost and credit attributable to Duke Energy’s pension plans and OPEB plans. The regulatory asset or liability is amortized with the recognition of actuarial gains and losses and prior service cost and credit to net periodic benefit costs for pension and OPEB plans. The accrued pension and OPEB regulatory assets are expected to be recovered primarily over the average remaining service periods or life expectancies of employees covered by the benefit plans. See Note 22 for additional detail. Deferred fuel and purchased power. Represents certain energy-related costs that are recoverable or refundable as approved by the applicable regulatory body. Storm cost securitized balance, net. Represents the North Carolina portion of storm restoration expenditures related to Hurricane Florence, Hurricane Michael, Hurricane Dorian and Winter Storm Diego (2018 and 2019 events). Nuclear asset securitized balance, net. Represents the balance associated with Crystal River Unit 3 retirement approved for recovery by the FPSC on September 15, 2015, and the upfront financing costs securitized in 2016 with issuance of the associated bonds. The regulatory asset balance is net of the AFUDC equity portion. Debt fair value adjustment. Purchase accounting adjustments recorded to state the carrying value of Progress Energy and Piedmont at fair value in connection with the 2012 and 2016 mergers, respectively. Amount is amortized over the life of the related debt. Retired generation facilities. Represents amounts to be recovered for facilities that have been retired and are probable of recovery. Post-in-service carrying costs (PISCC) and deferred operating expenses. Represents deferred depreciation and operating expenses as well as carrying costs on the portion of capital expenditures placed in service but not yet reflected in retail rates as plant in service. Hedge costs deferrals. Amounts relate to unrealized gains and losses on derivatives recorded as a regulatory asset or liability, respectively, until the contracts are settled. Deferred asset – Lee and Harris COLA. Represents deferred costs incurred for the canceled Lee and Harris nuclear projects. AMI. Represents deferred costs related to the installation of AMI meters and remaining net book value of non-AMI meters to be replaced at Duke Energy Carolinas, net book value of existing meters at Duke Energy Florida , Duke Energy Progress and Duke Energy Ohio and future recovery of net book value of electromechanical meters that have been replaced with AMI meters at Duke Energy Indiana. Customer connect project. Represents incremental operating expenses and carrying costs on deferred amounts related to the deployment of the new customer information system. DSM/EE. Deferred costs related to various DSM and EE programs recoverable through various mechanisms. Vacation accrual. Represents vacation entitlement, which is generally recovered in the following year. Storm cost deferrals. Represents deferred incremental costs incurred related to major weather-related events. NCEMPA deferrals. Represents retail allocated cost deferrals and returns associated with the additional ownership interest in assets acquired from NCEMPA in 2015. CEP deferral . Represents deferred depreciation, PISCC and deferred property tax for Duke Energy Ohio Gas capital assets for the Capital Expenditure Program (CEP). Derivatives – natural gas supply contracts . Represents costs for certain long-dated, fixed quantity forward natural gas supply contracts, which are recoverable through PGA clauses. COR settlement. Represents approved COR settlements that are being amortized over the average remaining lives, at the time of approval, of the associated assets. Nuclear deferral. Includes amounts related to levelizing nuclear plant outage costs, which allows for the recognition of nuclear outage expenses over the refueling cycle rather than when the outage occurs, resulting in the deferral of operations and maintenance costs associated with refueling. Deferred pipeline integrity costs. Represents pipeline integrity management costs in compliance with federal regulations. Costs of removal regulatory asset. Represents the excess of spend over funds received from customers to cover the future removal of property, plant and equipment from retired or abandoned sites as property is retired, net of certain deferred gains on NDTF investments. MGP. Represents remediation costs incurred at former MGP sites and the deferral of costs to be incurred at Duke Energy Ohio's East End and West End sites. Qualifying facility contract buyouts. Represents termination payments for regulatory recovery through the capacity clause. ABSAT, coal ash basin closure . Represents deferred depreciation and returns associated with Ash Basin Strategic Action Team (ABSAT) capital assets related to converting the ash handling system from wet to dry. Incremental COVID-19 expenses. Represents incremental costs related to ensuring continuity and quality of service in a safe manner during the COVID-19 pandemic. Amounts due from customers. Relates primarily to margin decoupling and IMR recovery mechanisms. Deferred severance charges. Represents costs incurred for employees separation from Duke Energy. Net regulatory liability related to income taxes. Amounts for all registrants include regulatory liabilities related primarily to impacts from the Tax Act. See Note 23 for additional information. Amounts have no immediate impact on rate base as regulatory assets are offset by deferred tax liabilities. Costs of removal. Represents funds received from customers to cover the future removal of property, plant and equipment from retired or abandoned sites as property is retired. Also includes certain deferred gains on NDTF investments. Provision for rate refunds. Represents estimated amounts due to customers based on recording interim rates subject to refund. Amounts to be refunded to customers. Represents required rate reductions to retail customers by the applicable regulatory body. RESTRICTIONS ON THE ABILITY OF CERTAIN SUBSIDIARIES TO MAKE DIVIDENDS, ADVANCES AND LOANS TO DUKE ENERGY As a condition to the approval of merger transactions, the NCUC, PSCSC, PUCO, KPSC and IURC imposed conditions on the ability of Duke Energy Carolinas, Duke Energy Progress, Duke Energy Ohio, Duke Energy Kentucky, Duke Energy Indiana and Piedmont to transfer funds to Duke Energy through loans or advances, as well as restricted amounts available to pay dividends to Duke Energy. Certain subsidiaries may transfer funds to the Parent by obtaining approval of the respective state regulatory commissions. These conditions imposed restrictions on the ability of the public utility subsidiaries to pay cash dividends as discussed below. Duke Energy Progress and Duke Energy Florida also have restrictions imposed by their first mortgage bond indentures, which in certain circumstances, limit their ability to make cash dividends or distributions on common stock. Amounts restricted as a result of these provisions were not material at December 31, 2021. Duke Energy Indiana has certain dividend restrictions as a result of the minority interest investment agreement entered in January 2021 with GIC. Duke Energy Indiana will declare dividends before the second closing, which is required to be completed no later than January 2023, in accordance with the agreement. See additional information in Note 1. Additionally, certain other subsidiaries of Duke Energy have restrictions on their ability to dividend, loan or advance funds to Duke Energy due to specific legal or regulatory restrictions, including, but not limited to, minimum working capital and tangible net worth requirements. The restrictions discussed below were not a material amount of Duke Energy's and Progress Energy's net assets at December 31, 2021. Duke Energy Carolinas Duke Energy Carolinas must limit cumulative distributions subsequent to mergers to (i) the amount of retained earnings on the day prior to the closing of the mergers, plus (ii) any future earnings recorded. Duke Energy Progress Duke Energy Progress must limit cumulative distributions subsequent to the mergers between Duke Energy and Progress Energy and Duke Energy and Piedmont to (i) the amount of retained earnings on the day prior to the closing of the respective mergers, plus (ii) any future earnings recorded. Duke Energy Ohio Duke Energy Ohio will not declare and pay dividends out of capital or unearned surplus without the prior authorization of the PUCO. Duke Energy Ohio received FERC and PUCO approval to pay dividends from its equity accounts that are reflective of the amount that it would have in its retained earnings account had push-down accounting for the Cinergy merger not been applied to Duke Energy Ohio’s balance sheet. The conditions include a commitment from Duke Energy Ohio that equity, adjusted to remove the impacts of push-down accounting, will not fall below 30% of total capital. Duke Energy Kentucky is required to pay dividends solely out of retained earnings and to maintain a minimum of 35% equity in its capital structure. Duke Energy Indiana Duke Energy Indiana must limit cumulative distributions subsequent to the merger between Duke Energy and Cinergy to (i) the amount of retained earnings on the day prior to the closing of the merger, plus (ii) any future earnings recorded. In addition, Duke Energy Indiana will not declare and pay dividends out of capital or unearned surplus without prior authorization of the IURC. Piedmont Piedmont must limit cumulative distributions subsequent to the acquisition of Piedmont by Duke Energy to (i) the amount of retained earnings on the day prior to the closing of the merger, plus (ii) any future earnings recorded. RATE-RELATED INFORMATION The NCUC, PSCSC, FPSC, IURC, PUCO, TPUC and KPSC approve rates for retail electric and natural gas services within their states. The FERC approves rates for electric sales to wholesale customers served under cost-based rates (excluding Ohio and Indiana), as well as sales of transmission service. The FERC also regulates certification and siting of new interstate natural gas pipeline projects. Duke Energy Carolinas and Duke Energy Progress 2021 Coal Ash Settlement On January 22 , 2021, Duke Energy Carolinas and Duke Energy Progress entered into the Coal Combustion Residuals Settlement Agreement (the “CCR Settlement Agreement”) with the North Carolina Public Staff (Public Staff), the North Carolina Attorney General’s Office and the Sierra Club (collectively, the "Settling Parties"), which was filed with the NCUC on January 25, 2021. The CCR Settlement Agreement resolves all coal ash prudence and cost recovery issues in connection with 2019 rate cases filed by Duke Energy Carolinas and Duke Energy Progress with the NCUC, as well as the equitable sharing issue on remand from the 2017 Duke Energy Carolinas and Duke Energy Progress North Carolina rate cases as a result of the December 11, 2020 North Carolina Supreme Court opinion. The settlement also provides clarity on coal ash cost recovery in North Carolina for Duke Energy Carolinas and Duke Energy Progress through January 2030 and February 2030 (the "Term"), respectively. Duke Energy Carolinas and Duke Energy Progress agreed not to seek recovery of approximately $1 billion of systemwide deferred coal ash expenditures, but will retain the ability to earn a debt and equity return during the amortization period, which shall be five years under the 2019 North Carolina rate cases and will be set by the NCUC in future rate case proceedings. The equity return and the amortization period on deferred coal ash costs under the 2017 Duke Energy Carolinas and Duke Energy Progress North Carolina rate cases will remain unaffected. The equity return on deferred coal ash costs under the 2019 North Carolina rate cases and future rate cases in North Carolina will be set at 150 basis points lower than the authorized return on equity (ROE) then in effect, with a capital structure composed of 48% debt and 52% equity. Duke Energy Carolinas and Duke Energy Progress retain the ability to earn a full WACC return during the deferral period, which is the period from when costs are incurred until they are recovered in rates. The Settling Parties agreed that execution by Duke Energy Carolinas and Duke Energy Progress of a settlement agreement between themselves and the NCDEQ dated December 31, 2019, (the “DEQ Settlement”) and the coal ash management plans included therein or subsequently approved by DEQ are reasonable and prudent. The Settling Parties retain the right to challenge the reasonableness and prudence of actions taken by Duke Energy Carolinas and Duke Energy Progress and costs incurred to implement the scope of work agreed upon in the DEQ Settlement, after February 1, 2020, and March 1, 2020, for Duke Energy Carolinas and Duke Energy Progress, respectively. The Settling Parties further agreed to waive rights through the Term to challenge the reasonableness or prudence of Duke Energy Carolinas’ and Duke Energy Progress’ historical coal ash management practices, and to waive the right to assert any arguments that future coal ash costs, including financing costs, shall be shared between either company and customers through equitable sharing or any other rate base or return adjustment that shares the revenue requirement burden of coal ash costs not otherwise disallowed due to imprudence. The Settling Parties agreed to a sharing arrangement for future coal ash insurance litigation proceeds between Duke Energy Carolinas and Duke Energy Progress and North Carolina customers. For more information, see Note 4 "Commitments and Contingencies." As a result of the CCR Settlement Agreement, Duke Energy Carolinas and Duke Energy Progress recorded a pretax charge of approximately $454 million and $494 million, respectively, in the fourth quarter of 2020 to Impairment of assets and other charges and a reversal of approximately $50 million and $102 million, respectively, to Regulated electric operating revenues on the respective Consolidated Statements of Operations. The Coal Ash Settlement was approved without modification in the NCUC Orders in the 2019 rate cases on March 31, 2021, and April 16, 2021, for Duke Energy Carolinas and Duke Energy Progress, respectively. The NCUC issued an Order on Remand Accepting CCR Settlement and Affirming Previous Orders Settling Rates and Imposing Penalties in the 2017 rate cases on June 25, 2021. Carbon Plan The NCUC is required by North Carolina House Bill 951 (HB 951) to adopt an initial Carbon Plan on or before December 31, 2022. The NCUC has directed Duke Energy Carolinas and Duke Energy Progress to file a proposed Carbon Plan on or before May 16, 2022. Duke Energy Carolinas and Duke Energy Progress cannot predict the outcome of this matter. Performance-Based Regulation Rules On February 10, 2022, the NCUC adopted rules to govern the application and review process for the Performance-Based Regulation (PBR) authorized under HB 951. The PBR rules are constructive and consistent with the policy objectives of HB 951. 2020 North Carolina Storm Securitization Filings On October 26, 2020, Duke Energy Carolinas and Duke Energy Progress filed a joint petition with the NCUC, as agreed to in partial settlements reached in the 2019 North Carolina Rate Cases for Duke Energy Carolinas and Duke Energy Progress, seeking authorization for the financing of the costs of each utility's storm recovery activities required as a result of Hurricane Florence, Hurricane Michael, Hurricane Dorian and Winter Storm Diego. Specifically, Duke Energy Carolinas and Duke Energy Progress requested that the NCUC find that their storm recovery costs and related financing costs are appropriately financed by debt secured by storm recovery property, and that the commission issue financing orders by which each utility may accomplish such financing using a securitization structure. On January 27, 2021, Duke Energy Carolinas, Duke Energy Progress and the Public Staff filed an Agreement and Stipulation of Partial Settlement, subject to review and approval of the NCUC, resolving certain accounting issues, including agreement to support an 18- to 20-year bond period. In the NCUC Orders in the 2019 rate cases issued on March 31, 2021, and April 16, 2021, for Duke Energy Carolinas and Duke Energy Progress, respectively, the reasonableness and prudence of the deferred storm costs was approved. On May 20, 2021, the NCUC issued financing orders authorizing the companies to issue storm recovery bonds, subject to the terms of the financing orders, and approving the Agreement and Stipulation of Partial Settlement in its entirety. The storm recovery bonds were issued by Duke Energy Carolinas and Duke Energy Progress on November 24, 2021. COVID-19 Filings North Carolina Duke Energy Carolinas and Duke Energy Progress filed a joint petition on August 7, 2020, with the NCUC for deferral treatment of incremental costs and the cost of waived customer fees due to the COVID-19 pandemic. On December 29, 2021, the NCUC approved Duke Energy Carolinas' and Duke Energy Progress' joint petition to defer estimated incremental pandemic-related costs, without prejudice, to the NCUC's future determination of the appropriate ratemaking treatment ultimately to be accorded such costs in future rate case proceedings. Duke Energy Carolinas Regulatory Assets and Liabilities The following tables present the regulatory assets and liabilities recorded on Duke Energy Carolinas' Consolidated Balance Sheets. December 31, Earns/Pays Recovery/Refund (in millions) 2021 2020 a Return Period Ends Regulatory Assets (a) AROs – coal ash $ 1,227 $ 1,414 (h) (b) Accrued pension and OPEB (c) 365 427 Yes (i) Deferred fuel and purchased power 339 42 (e) 2023 Storm cost securitized balance, net 232 — 2041 Retired generation facilities (c) 54 11 Yes 2023 PISCC (c) 31 32 Yes (b) Hedge costs deferrals (c) 171 174 Yes (b) Deferred asset – Lee COLA 296 324 (b) AMI 140 154 Yes (b) Customer connect project 66 50 Yes (b) Vacation accrual 83 84 2022 Storm cost deferrals 22 205 Yes (b) COR settlement 91 95 Yes (b) Nuclear deferral 78 88 2023 ABSAT, coal ash basin closure 67 71 Yes (b) Incremental COVID-19 expenses 51 31 Yes (b) Deferred severance charges 36 57 2023 Other 130 210 (b) Total regulatory assets 3,479 3,469 Less: current portion 544 473 Total noncurrent regulatory assets $ 2,935 $ 2,996 Regulatory Liabilities (a) Net regulatory liability related to income taxes (d) $ 2,785 $ 2,874 (b) Costs of removal (c) 2,009 1,975 Yes (f) AROs – nuclear and other 2,053 1,512 (b) Provision for rate refunds (c) 124 170 Yes Hedge cost deferrals 154 16 (b) Accrued pension and OPEB (c) 44 32 Yes (i) Other 516 429 (b) Total regulatory liabilities 7,685 7,008 Less: current portion 487 473 Total noncurrent regulatory liabilities $ 7,198 $ 6,535 (a) Regulatory assets and liabilities are excluded from rate base unless otherwise noted. (b) The expected recovery or refund period varies or has not been determined. (c) Included in rate base. (d) Includes regulatory liabilities related to the change in the federal tax rate as a result of the Tax Act and the change in the North Carolina tax rate, both discussed in Note 23. Portions are included in rate base. (e) Pays interest on over-recovered costs in North Carolina. Includes certain purchased power costs in North Carolina and South Carolina and costs of distributed energy in South Carolina. (f) Recovered over the life of the associated assets. (g) Includes incentives on DSM/EE investments and is recovered through an annual rider mechanism. (h) Earns a debt and equity return on coal ash expenditures for North Carolina and South Carolina retail customers as permitted by various regulatory orders. (i) Recovered primarily over the average remaining service periods or life expectancies of employees covered by the benefit plans. See Note 22 for additional detail. 2017 North Carolina Rate Case On August 25, 2017, Duke Energy Carolinas filed an application with the NCUC for a rate increase for retail customers of approximately $647 million. On February 28, 2018, Duke Energy Carolinas and the Public Staff filed an Agreement and Stipulation of Partial Settlement resolving certain portions of the proceeding. Terms of the settlement included an ROE of 9.9% and a capital structure of 52% equity and 48% debt. On June 22, 2018, the NCUC issued an order approving the Stipulation of Partial Settlement and requiring a revenue reduction. The North Carolina Attorney General and other parties separately filed Notices of Appeal to the North Carolina Supreme Court. The North Carolina Supreme Court consolidated the Duke Energy Carolinas and Duke Energy Progress appeals. On December 11, 2020, the North Carolina Supreme Court issued an opinion, which affirmed, in part, and reversed and remanded, in part, the NCUC’s decisions. In the Opinion, the court upheld the NCUC's decision to include coal ash costs in the cost of service, as well as the NCUC’s discretion to allow a return on the unamortized balance of coal ash costs. The court also remanded to the NCUC a single issue to consider the assessment of support for the Public Staff’s equitable sharing argument. On January 22, 2021, Duke Energy Carolinas and Duke Energy Progress entered into the CCR Settlement Agreement with the Settling Parties, which was filed with the NCUC on January 25, 2021, and approved by the NCUC on March 31, 2021. The NCUC issued an Order on Remand Accepting CCR Settlement and Affirming Previous Orders Setting Rates and Imposing Penalties on June 25, 2021. 2019 North Carolina Rate Case On September 30, 2019, Duke Energy Carolinas filed an application with the NCUC for a net rate increase for retail customers of approximately $291 million, which represented an approximate 6% increase in annual base revenues. The gross rate case revenue increase request was $445 million, which was offset by an EDIT rider of $154 million to return to customers North Carolina and federal EDIT resulting from recent reductions in corporate tax rates. The request for a rate increase was driven by major capital investments subsequent to the previous base rate case, coal ash pond closure costs, accelerated coal plant depreciation and deferred 2018 storm costs. Duke Energy Carolinas requested rates be effective no later than August 1, 2020. On March 25, 2020, Duke Energy Carolinas and the Public Staff filed an Agreement and Stipulation of Partial Settlement, subject to review and approval of the NCUC, resolving certain issues in the base rate proceeding. On July 24, 2020, Duke Energy Carolinas filed its request for approval of its notice to customers required to implement temporary rates. On July 27, 2020, Duke Energy Carolinas filed a joint motion with Duke Energy Progress and the Public Staff notifying the commission that the parties reached a joint partial settlement with the Public Staff. Also, on July 27, 2020, Duke Energy Carolinas filed a letter stating that it intended to update its temporary rates calculation to reflect the terms of the partial settlement. On July 31, 2020, Duke Energy Carolinas and the Public Staff filed a Second Agreement and Stipulation of Partial Settlement (Second Partial Settlement), subject to review and approval of the NCUC, resolving certain remaining issues in the base rate proceeding. The remaining items litigated at hearing included recovery of deferred coal ash compliance costs that are subject to asset retirement obligation accounting, implementation of new depreciation rates and the amortization period of the loss on the hydro station sale. On August 4, 2020, Duke Energy Carolinas filed an amended motion for approval of its amended notice to customers, seeking to exercise its statutory right to implement temporary rates subject to refund on or after August 24, 2020. The revenue requirement to be recovered, subject to refund, through the temporary rates was based on and consistent with the base rate component of the Second Partial Settlement and excluded the items to be litigated noted above. The NCUC approved the August 4, 2020 amended temporary rates motion on August 6, 2020, and temporary rates went into effect on August 24, 2020. The Duke Energy Carolinas evidentiary hearing concluded on September 18, 2020, and post-hearing filings were made with the NCUC from all parties by November 4, 2020. On January 22, 2021, Duke Energy Carolinas and Duke Energy Progress entered into the CCR Settlement Agreement with the Settling Parties, which was filed with the NCUC on January 25, 2021. On March 31, 2021, the NCUC issued an order approving the March 25, 2020, and July 31, 2020, partial settlements. The order includes approval of 1) an ROE of 9.6% based upon a capital structure of 52% equity and 48% debt; 2) deferral treatment of approximately $800 million of grid improvement projects with a return; 3) a flow back period of five years for unprotected federal EDIT; and 4) the reasonableness and prudence of $213 million of deferred storm costs, which were removed from the rate case and for which Duke Energy Carolinas filed a petition seeking securitization in October 2020. Additionally, the order approved without modification the CCR Settlement Agreement. The order denied Duke Energy Carolinas' proposal to shorten the remaining depreciable lives of certain Duke Energy Carolinas coal-fired generating units, indicating the NCUC has not had the chance to fully examine the issue within the context of an integrated resource planning (IRP) proceeding, and upon retirement the remaining net book value of these units should be placed in a regulatory asset account to be amortized over an appropriate period to be determined in a future rate case. On May 21, 2021, the NCUC issued an Order Approving Rate Schedules, which resulted in a net increase of approximately $33 million. Revised customer rates became effective on June 1, 2021. 2018 South Carolina Rate Case On November 8, 2018, Duke Energy Carolinas filed an application with the PSCSC for a rate increase for retail customers of approximately $168 million. After hearings in March 2019, the PSCSC issued an order on May 21, 2019, which included an ROE of 9.5% and a capital structure of 53% equity and 47% debt. The order also included the following material components: • Approval of cancellation of the Lee Nuclear Project, with Duke Energy Carolinas maintaining the combined operating license; • Approval of recovery of $125 million (South Carolina retail portion) of Lee Nuclear Project development costs (including AFUDC through December 2017) over a 12-year period, but denial of a return on the deferred balance of costs; • Approval of recovery of $96 million of coal ash costs over a five-year period with a return at Duke Energy Carolinas' WACC; • Denial of recovery of $115 million of certain coal ash costs deemed to be related to the Coal Ash Act and incremental to the federal CCR rule; • Approval of a $66 million decrease to base rates to reflect the change in ongoing tax expense, primarily the reduction in the federal income tax rate from 35% to 21%; • Approval of a $45 million decrease through the EDIT Rider to return EDIT resulting from the federal tax rate change and deferred revenues since January 2018 related to the change, to be returned in accordance with the Average Rate Assumption Method (ARAM) for protected EDIT, over a 20-year period for unprotected EDIT associated with Property, Plant and Equipment, over a five-year period for unprotected EDIT not associated with Property, Plant and Equipment and over a five-year period for the deferred revenues; and • Approval of a $17 million decrease through the EDIT Rider related to reductions in the North Carolina state income tax rate from 6.9% to 2.5% to be returned over a five-year period. As a result of the order, revised customer rates were effective June 1, 2019. On May 31, 2019, Duke Energy Carolinas filed a Petition for Rehearing or Reconsideration of that order contending substantial rights of Duke Energy Carolinas were prejudiced by unlawful, arbitrary and capricious rulings by the PSCSC on certain issues presented in the proceeding. On June 19, 2019, the PSCSC issued a directive denying Duke Energy Carolinas' request to rehear or reconsider the commission's rulings on certain issues presented in the proceeding including coal ash remediation and disposal costs, ROE and the recovery of a return on deferred operation and maintenance expenses. An order detailing the commission's decision in the directive was issued on October 18, 2019. Duke Energy Carolinas filed a notice of appeal on November 15, 2019, with the Supreme Court of South Carolina. On November 20, 2019, the South Carolina Energy Users Committee filed a Notice of Appeal with the Supreme Court of South Carolina. Initial briefs were filed on April 21, 2020, which included the South Carolina Energy User's Committee brief arguing that the PSCSC erred in allowing Duke Energy Carolinas' recovery of costs relat

Commitments and Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2021
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	COMMITMENTS AND CONTINGENCIES INSURANCE General Insurance The Duke Energy Registrants have insurance and reinsurance coverage either directly or through indemnification from Duke Energy’s captive insurance company, Bison, and its affiliates, consistent with companies engaged in similar commercial operations with similar type properties. The Duke Energy Registrants’ coverage includes (i) commercial general liability coverage for liabilities arising to third parties for bodily injury and property damage; (ii) workers’ compensation; (iii) automobile liability coverage; and (iv) property coverage for all real and personal property damage. Real and personal property damage coverage excludes electric transmission and distribution lines, but includes damages arising from boiler and machinery breakdowns, earthquakes, flood damage and extra expense, but not outage or replacement power coverage. All coverage is subject to certain deductibles or retentions, sublimits, exclusions, terms and conditions common for companies with similar types of operations. The Duke Energy Registrants self-insure their electric transmission and distribution lines against loss due to storm damage and other natural disasters. As discussed further in Note 3, Duke Energy Florida maintains a storm damage reserve and has a regulatory mechanism to recover the cost of named storms on an expedited basis. The cost of the Duke Energy Registrants’ coverage can fluctuate from year to year reflecting claims history and conditions of the insurance and reinsurance markets. In the event of a loss, terms and amounts of insurance and reinsurance available might not be adequate to cover claims and other expenses incurred. Uninsured losses and other expenses, to the extent not recovered by other sources, could have a material effect on the Duke Energy Registrants’ results of operations, cash flows or financial position. Each company is responsible to the extent losses may be excluded or exceed limits of the coverage available. Nuclear Insurance Duke Energy Carolinas owns and operates McGuire and Oconee and operates and has a partial ownership interest in Catawba. McGuire and Catawba each have two reactors. Oconee has three reactors. The other joint owners of Catawba reimburse Duke Energy Carolinas for certain expenses associated with nuclear insurance per the Catawba joint owner agreements. Duke Energy Progress owns and operates Robinson, Brunswick and Harris. Robinson and Harris each have one reactor. Brunswick has two reactors. Duke Energy Florida owns Crystal River Unit 3, which permanently ceased operation in 2013 and achieved a SAFSTOR condition in July 2019. On October 1, 2020, Crystal River Unit 3 changed decommissioning strategies from SAFSTOR to DECON. In the event of a loss, terms and amounts of insurance available might not be adequate to cover property damage and other expenses incurred. Uninsured losses and other expenses, to the extent not recovered by other sources, could have a material effect on Duke Energy Carolinas’, Duke Energy Progress’ and Duke Energy Florida’s results of operations, cash flows or financial position. Each company is responsible to the extent losses may be excluded or exceed limits of the coverage available. Nuclear Liability Coverage The Price-Anderson Act requires owners of nuclear reactors to provide for public nuclear liability protection per nuclear incident up to a maximum total financial protection liability. The maximum total financial protection liability, which is approximately $13.5 billion, is subject to change every five years for inflation and for the number of licensed reactors. Total nuclear liability coverage consists of a combination of private primary nuclear liability insurance coverage and a mandatory industry risk-sharing program to provide for excess nuclear liability coverage above the maximum reasonably available private primary coverage. The U.S. Congress could impose revenue-raising measures on the nuclear industry to pay claims. Primary Liability Insurance Duke Energy Carolinas and Duke Energy Progress have purchased the maximum reasonably available private primary nuclear liability insurance as required by law, which is $450 million per station. Duke Energy Florida has purchased $100 million primary nuclear liability insurance in compliance with the law. Excess Liability Program This program provides $13.1 billion of coverage per incident through the Price-Anderson Act’s mandatory industrywide excess secondary financial protection program of risk pooling. This amount is the product of potential cumulative retrospective premium assessments of $138 million times the current 95 licensed commercial nuclear reactors in the U.S. Under this program, operating unit licensees could be assessed retrospective premiums to compensate for public nuclear liability damages in the event of a nuclear incident at any licensed facility in the U.S. Retrospective premiums may be assessed at a rate not to exceed $20.5 million per year per licensed reactor for each incident. The assessment may be subject to state premium taxes. Nuclear Property and Accidental Outage Coverage Duke Energy Carolinas, Duke Energy Progress and Duke Energy Florida are members of Nuclear Electric Insurance Limited (NEIL), an industry mutual insurance company, which provides property damage, nuclear accident decontamination and premature decommissioning insurance for each station for losses resulting from damage to its nuclear plants, either due to accidents or acts of terrorism. Additionally, NEIL provides accidental outage coverage for losses in the event of a major accidental outage at an insured nuclear station. Pursuant to regulations of the NRC, each company’s property damage insurance policies provide that all proceeds from such insurance be applied, first, to place the plant in a safe and stable condition after a qualifying accident and second, to decontaminate the plant before any proceeds can be used for decommissioning, plant repair or restoration. Losses resulting from acts of terrorism are covered as common occurrences, such that if terrorist acts occur against one or more commercial nuclear power plants insured by NEIL within a 12-month period, they would be treated as one event and the owners of the plants where the act occurred would share one full limit of liability. The full limit of liability is currently $3.2 billion. NEIL sublimits the total aggregate for all of their policies for non-nuclear terrorist events to approximately $1.8 billion. Each nuclear facility has accident property damage, nuclear accident decontamination and premature decommissioning liability insurance from NEIL with limits of $1.5 billion, except for Crystal River Unit 3. Crystal River Unit 3’s limit is $50 million and is on an actual cash value basis. All nuclear facilities except for Catawba and Crystal River Unit 3 also share an additional $1.25 billion nuclear accident insurance limit above their dedicated underlying limit. This shared additional excess limit is not subject to reinstatement in the event of a loss. Catawba has a dedicated $1.25 billion of additional nuclear accident insurance limit above its dedicated underlying limit. Catawba and Oconee also have an additional $750 million of non-nuclear accident property damage limit. All coverages are subject to sublimits and significant deductibles. NEIL’s Accidental Outage policy provides some coverage, similar to business interruption, for losses in the event of a major accident property damage outage of a nuclear unit. Coverage is provided on a weekly limit basis after a significant waiting period deductible and at 100% of the applicable weekly limits for 52 weeks and 80% of the applicable weekly limits for up to the next 110 weeks. Coverage is provided until these applicable weekly periods are met, where the accidental outage policy limit will not exceed $490 million for Catawba, $434 million for McGuire, $364 million for Harris, $336 million for Brunswick, $322 million for Oconee and $280 million for Robinson. NEIL sublimits the accidental outage recovery up to the first 104 weeks of coverage not to exceed $328 million from non-nuclear accidental property damage. Coverage amounts decrease in the event more than one unit at a station is out of service due to a common accident. All coverages are subject to sublimits and significant deductibles. Potential Retroactive Premium Assessments In the event of NEIL losses, NEIL’s board of directors may assess member companies' retroactive premiums of amounts up to 10 times their annual premiums for up to six years after a loss. NEIL has never exercised this assessment. The maximum aggregate annual retrospective premium obligations for Duke Energy Carolinas, Duke Energy Progress and Duke Energy Florida are $140 million, $88 million and $1 million, respectively. Duke Energy Carolinas' maximum assessment amount includes 100% of potential obligations to NEIL for jointly owned reactors. Duke Energy Carolinas would seek reimbursement from the joint owners for their portion of these assessment amounts. ENVIRONMENTAL The Duke Energy Registrants are subject to federal, state and local laws regarding air and water quality, hazardous and solid waste disposal, coal ash and other environmental matters. These laws can be changed from time to time, imposing new obligations on the Duke Energy Registrants. The following environmental matters impact all of the Duke Energy Registrants. Remediation Activities In addition to the ARO recorded as a result of various environmental regulations, discussed in Note 9, the Duke Energy Registrants are responsible for environmental remediation at various sites. These include certain properties that are part of ongoing operations and sites formerly owned or used by Duke Energy entities. These sites are in various stages of investigation, remediation and monitoring. Managed in conjunction with relevant federal, state and local agencies, remediation activities vary based upon site conditions and location, remediation requirements, complexity and sharing of responsibility. If remediation activities involve joint and several liability provisions, strict liability, or cost recovery or contribution actions, the Duke Energy Registrants could potentially be held responsible for environmental impacts caused by other potentially responsible parties and may also benefit from insurance policies or contractual indemnities that cover some or all cleanup costs. Liabilities are recorded when losses become probable and are reasonably estimable. The total costs that may be incurred cannot be estimated because the extent of environmental impact, allocation among potentially responsible parties, remediation alternatives and/or regulatory decisions have not yet been determined at all sites. Additional costs associated with remediation activities are likely to be incurred in the future and could be significant. Costs are typically expensed as Operation, maintenance and other in the Consolidated Statements of Operations unless regulatory recovery of the costs is deemed probable. The following tables contain information regarding reserves for probable and estimable costs related to the various environmental sites. These reserves are recorded in Other within Other Noncurrent Liabilities on the Consolidated Balance Sheets. (in millions) December 31, 2021 December 31, 2020 Reserves for Environmental Remediation Duke Energy $ 88 $ 75 Duke Energy Carolinas 19 19 Progress Energy 23 19 Duke Energy Progress 11 6 Duke Energy Florida 11 12 Duke Energy Ohio 34 22 Duke Energy Indiana 4 6 Piedmont 9 10 Additional losses in excess of recorded reserves that could be incurred for the stages of investigation, remediation and monitoring for environmental sites that have been evaluated at this time are not material. LITIGATION Duke Energy Michael Johnson et al. v. Duke Energy Corporation et al. On September 23, 2020, plaintiff Michael Johnson, a former Duke Energy employee and participant in the Duke Energy Retirement Savings Plan (Plan) brought suit on his own behalf and on behalf of other participants and beneficiaries similarly situated against Duke Energy Corporation, the Duke Energy Benefits Committee, and other unnamed individual defendants. The complaint, which was subsequently amended to add a current participant as a plaintiff on November 23, 2020, alleges that the defendants breached their fiduciary duties with respect to certain fees associated with the Plan in violation of the Employee Retirement Income Security Act of 1974 and seeks certification of a class of all individuals who were participants or beneficiaries of the Plan at any time on or after September 23, 2014. The defendants filed a motion to dismiss the plaintiffs’ amended complaint on December 18, 2020. On January 31, 2022, the court denied the defendants' motion to dismiss. Duke Energy will be filing its answer to the amended complaint, following which discovery will commence. Duke Energy cannot predict the outcome of this matter. Texas Storm Uri Tort Litigation Several Duke Energy renewables project companies, located in the Electric Reliability Council of Texas (ERCOT) market, were named in lawsuits arising out of Texas Storm Uri in mid-February 2021. Several additional suits, where Duke Energy Corporation had been named, were dismissed The current lawsuits seek recovery for property damages, personal injury and for wrongful death allegedly caused by the power outages, which the plaintiffs claim was the result of collective failures of generators, transmission and distribution operators, retail energy providers and others including ERCOT. The cases have been consolidated into a Texas state court multidistrict litigation (MDL) proceeding for discovery purposes. With the exception of a few bellwether cases which are still being decided, all the lawsuits in the MDL will be stayed until motions to dismiss are filed and considered by the court in mid-2022. The bellwether cases will include those in which the Duke Energy entities are named. Duke Energy cannot predict the outcomes of these matters. Duke Energy Carolinas and Duke Energy Progress Coal Ash Insurance Coverage Litigation In March 2017, Duke Energy Carolinas and Duke Energy Progress filed a civil action in the North Carolina Business Court against various insurance providers. The lawsuit sought payment for coal ash related liabilities covered by third-party liability insurance policies. The insurance policies were issued between 1971 and 1986 and provide third-party liability insurance for property damage. The civil action sought damages for breach of contract and indemnification for costs arising from the Coal Ash Act and the EPA CCR rule at 15 coal-fired plants in North Carolina and Sout h Carolina. Duke Energy Carolinas and Duke Energy Progress have now resolved claims against all of the insurers sued in this litigation and have dismissed their claims against all of the insurers. Duke Energy Carolinas and Duke Energy Progress have received approximately $418 million of coa l ash insurance litigation proceeds from settlements with insurer-defendants and the proceeds will be distributed in accordance with the terms of the CCR settlement agreement. Duke Energy Carolinas Ruben Villano, et al. v. Duke Energy Carolinas, LLC On June 16, 2021, a group of nine individuals went over a low head dam adjacent to the Dan River Steam Station in Eden, North Carolina, while water tubing. Emergency personnel rescued four people and five others were confirmed deceased. On August 11, 2021, Duke Energy Carolinas was served with the complaint filed in Durham County Superior Court on behalf of four survivors, which was later amended to include all the decedents along with the survivors, except for one minor. The lawsuit alleges that Duke Energy Carolinas knew that the river was used for recreational purposes and that Duke Energy did not adequately warn about the dam. On September 30, 2021, Duke Energy Carolinas filed its motion to dismiss and motion for transfer of venue from Durham County to Rockingham County, both of which were denied on November 15, 2021. On November 15, 2021, Duke Energy Carolinas was also served with Plaintiffs Second Amended Complaint, which added the final minor plaintiff and consolidated all the actions into one lawsuit. Duke Energy Carolinas has filed its Answer and Affirmative Defenses to the Second Amended Complaint. Discovery has now commenced. Duke Energy Carolinas cannot predict the outcome of this matter. NTE Carolinas II, LLC Litigation In November 2017, Duke Energy Carolinas entered into a standard FERC large generator interconnection agreement (LGIA) with NTE Carolinas II, LLC (NTE), a company that proposed to build a combined-cycle natural gas plant in Rockingham County, North Carolina. On September 6, 2019, Duke Energy Carolinas filed a lawsuit in Mecklenburg County Superior Court against NTE for breach of contract, alleging that NTE's failure to pay benchmark payments for Duke Energy Carolinas' transmission system upgrades required under the interconnection agreement constituted a termination of the interconnection agreement. Duke Energy Carolinas is seeking a monetary judgment against NTE because NTE failed to make multiple milestone payments. The lawsuit was moved to federal court in North Carolina. NTE filed a motion to dismiss Duke Energy Carolinas’ complaint and brought counterclaims alleging anti-competitive conduct and violations of state and federal statutes. Duke Energy Carolinas filed a motion to dismiss NTE's counterclaims. On May 21, 2020, in response to a NTE petition challenging Duke Energy Carolinas' termination of the LGIA, FERC issued a ruling that 1) FERC has exclusive jurisdiction to determine whether a transmission provider may terminate a LGIA; 2) FERC approval is required to terminate a conforming LGIA if objected to by the interconnection customer; and 3) Duke Energy may not announce the termination of a conforming LGIA unless FERC has approved the termination. FERC's Office of Enforcement also initiated an investigation of Duke Energy Carolinas into matters pertaining to the LGIA. Duke Energy Carolinas is cooperating with the Office of Enforcement and cannot predict the outcome of this investigation. On August 17, 2020, the court denied both NTE’s and Duke Energy Carolinas’ motions to dismiss. In October 2021, NTE filed a Second Amended Counterclaim and Complaint, and in January 2022, NTE filed a Third Amended Counterclaim and Complaint. Duke Energy Carolinas has responded to these pleadings. On December 6, 2021, Duke Energy Carolinas filed an Amended Complaint. Discovery is scheduled to end by April 2022, after which the parties will file dispositive motions for the court's consideration. The case is scheduled to be trial ready by August 1, 2022. Duke Energy Carolinas cannot predict the outcome of this matter. Asbestos-related Injuries and Damages Claims Duke Energy Carolinas has experienced numerous claims for indemnification and medical cost reimbursement related to asbestos exposure. These claims relate to damages for bodily injuries alleged to have arisen from exposure to or use of asbestos in connection with construction and maintenance activities conducted on its electric generation plants prior to 1985. Duke Energy Carolinas has recognized asbestos-related reserves of $501 million and $572 million at December 31, 2021, and 2020, respectively. These reserves are classified in Other within Other Noncurrent Liabilities and Other within Current Liabilities on the Consolidated Balance Sheets. The change in the reserves is a result of a third-party study completed in 2021 as well as settlements made throughout the year. These reserves are based upon Duke Energy Carolinas' best estimate for current and future asbestos claims through 2041 and are recorded on an undiscounted basis. In light of the uncertainties inherent in a longer-term forecast, management does not believe they can reasonably estimate the indemnity and medical costs that might be incurred after 2041 related to such potential claims. It is possible Duke Energy Carolinas may incur asbestos liabilities in excess of the recorded reserves. Duke Energy Carolinas has third-party insurance to cover certain losses related to asbestos-related injuries and damages above an aggregate self-insured retention. Receivables for insurance recoveries were $644 million and $704 million at December 31, 2021, and 2020, respectively. These amounts are classified in Other within Other Noncurrent Assets and Receivables within Current Assets on the Consolidated Balance Sheets. Any future payments up to the policy limit will be reimbursed by the third-party insurance carrier. Duke Energy Carolinas is not aware of any uncertainties regarding the legal sufficiency of insurance claims. Duke Energy Carolinas believes the insurance recovery asset is probable of recovery as the insurance carrier continues to have a strong financial strength rating. As described in Note 1, Duke Energy adopted the new guidance for credit losses effective January 1, 2020, using the modified retrospective method of adoption, which does not require restatement of prior year reported results. The reserve for credit losses for insurance receivables for the asbestos-related injuries and damages based on adoption of the new standard is $12 million and $15 million for Duke Energy and Duke Energy Carolinas as of December 31, 2021, and December 31, 2020, respectively. The insurance receivable is evaluated based on the risk of default and the historical losses, current conditions and expected conditions around collectability. Management evaluates the risk of default annually based on payment history, credit rating and changes in the risk of default from credit agencies. Duke Energy Progress and Duke Energy Florida Spent Nuclear Fuel Matters On June 18, 2018, Duke Energy Progress and Duke Energy Florida sued the U.S. in the U.S. Court of Federal Claims for damages incurred for the period 2014 through 2018. The lawsuit claimed the Department of Energy breached a contract in failing to accept spent nuclear fuel under the Nuclear Waste Policy Act of 1982 and asserted damages for the cost of on-site storage in the amount of $100 million and $200 million for Duke Energy Progress and Duke Energy Florida, respectively. The Department of Energy filed a motion for partial summary judgment relating to approximately $60 million of Duke Energy Florida’s claimed damages. A hearing on the motion was held on February 9, 2022. Trial is scheduled for April 2022. Duke Energy Progress and Duke Energy Florida cannot predict the outcome of this matter. Duke Energy Florida Power Purchase Dispute Arbitration Duke Energy Florida, on behalf of its customers, entered into a PPA for the purchase of firm capacity and energy from a qualifying facility under the Public Utilities Regulatory Policies Act of 1978. Duke Energy Florida determined the qualifying facility did not perform in accordance with the PPA, and Duke Energy Florida terminated the PPA. The qualifying facility counterparty filed a confidential American Arbitration Association (AAA) arbitration demand, challenging the termination of the PPA and seeking damages. The final arbitration hearing occurred during the week of December 7, 202 0. An interim arbitral award was issued in March 2021, upholding Duke Energy Florida's positions on all issues and awarding the company termination costs. In May 2021, the final arbitral award was issued awarding Duke Energy Florida its claimed fees and costs. O n August 18, 2021, Duke Energy Florida filed a motion in Florida state court to confirm the arbitral award. On December 13, 2021, the court entered a final judgment confirming the arbitration award. Duke Energy Indiana Coal Ash Basin Closure Plan Appeal On January 27, 2020, Hoosier Environmental Council (HEC) filed a Petition for Administrative Review with the Indiana Office of Environmental Adjudication challenging the Indiana Department of Environmental Management’s (IDEM's) December 10, 2019 partial approval of Duke Energy Indiana’s ash pond closure plan at Gallagher. After hearing oral arguments in early April 2021 on Duke Energy Indiana's and HEC's competing Motions for Summary Judgment, on May 4, 2021, the administrative court rejected all of HEC’s claims and issued a ruling in favor of Duke Energy Indiana. On June 3, 2021, HEC filed an appeal in Superior Court to seek judicial review of the order . On June 25, 2021, Duke Energy Indiana filed its response to the Petition to Review. On August 30, 2021, HEC served Duke Energy Indiana with its Brief in Support of Petition for Judicial Review. On October 29, 2021, Duke Energy Indiana and IDEM filed their response briefs. On December 13, 2021, HEC filed and served its Reply Brief. On January 11, 2022, Duke Energy Indiana received a compliance obligation letter from the EPA notifying the company that the two basins at issue in the litigation are subject to requirements of the CCR Rule. The letter does not provide a deadline for compliance. Duke Energy Indiana is evaluating the EPA letter, its potential impacts on the litigation and the extent to which this letter could apply to CCR surface impoundments at its other Indiana sites. Following the January 11, 2022 EPA notice of compliance letter, the parties filed a joint motion to stay the litigation for 45 days, which was approved by the court. As a result, the oral argument scheduled for February 1, 2022, was postponed until the end of the 45-day stay. Duke Energy Indiana cannot predict the outcome of this matter. Other Litigation and Legal Proceedings The Duke Energy Registrants are involved in other legal, tax and regulatory proceedings arising in the ordinary course of business, some of which involve significant amounts. The Duke Energy Registrants believe the final disposition of these proceedings will not have a material effect on their results of operations, cash flows or financial position for the years presented. Reserves are classified on the Consolidated Balance Sheets in Other within Other Noncurrent Liabilities and Other within Current Liabilities. OTHER COMMITMENTS AND CONTINGENCIES General As part of their normal business, the Duke Energy Registrants are party to various financial guarantees, performance guarantees and other contractual commitments to extend guarantees of credit and other assistance to various subsidiaries, investees and other third parties. These guarantees involve elements of performance and credit risk, which are not fully recognized on the Consolidated Balance Sheets and have uncapped maximum potential payments. See Note 7 for more information. Purchase Obligations Purchased Power Duke Energy Progress, Duke Energy Florida and Duke Energy Ohio have ongoing purchased power contracts, including renewable energy contracts, with other utilities, wholesale marketers, co-generators and qualified facilities. These purchased power contracts generally provide for capacity and energy payments. In addition, Duke Energy Progress and Duke Energy Florida have various contracts to secure transmission rights. The following table presents executory purchased power contracts with terms exceeding one year, excluding contracts classified as leases. Minimum Purchase Amount at December 31, 2021 Contract (in millions) Expiration 2022 2023 2024 2025 2026 Thereafter Total Duke Energy Progress (a) 2028-2032 $ 22 $ 22 $ 21 $ 22 $ 18 $ 45 $ 150 Duke Energy Florida (b) 2023-2025 354 374 262 91 — — 1,081 Duke Energy Ohio (c)(d) 2023 53 34 — — — — 87 (a) Contracts represent between 18% and 100% of net plant output. (b) Contracts represent 100% of net plant output. (c) Contracts represent 15% of net plant output. (d) Excludes PPA with OVEC. See Note 17 for additional information. Gas Supply and Capacity Contracts Duke Energy Ohio and Piedmont routinely enter into long-term natural gas supply commodity and capacity commitments and other agreements that commit future cash flows to acquire services needed in their businesses. These commitments include pipeline and storage capacity contracts and natural gas supply contracts to provide service to customers. Costs arising from the natural gas supply commodity and capacity commitments, while significant, are pass-through costs to customers and are generally fully recoverable through the fuel adjustment or PGA pro cedures and prudence reviews in North Carolina and South Carolina and under the Tennessee Incentive Plan in Tennessee. In the Midwest, these costs are recovered via the Gas Cost Recovery Rate in Ohio or the Gas Cost Adjustment Clause in Kentucky. The time periods for fixed payments under pipeline and storage capacity contracts are up to 14 years. The time periods for fixed payments under natural gas supply contracts are up to five years. The time period for the natural gas supply purchase commitments is up to 10 years. Certai n storage and pipeline capacity contracts require the payment of demand charges that are based on rates approved by the FERC in order to maintain rights to access the natural gas storage or pipeline capacity on a firm basis during the contract term. The demand charges that are incurred in each period are recognized in the Consolidated Statements of Operations and Comprehensive Income as part of natural gas purchases and are included in Cost of natural gas. The following table presents future unconditional purchase obligations under natural gas supply and capacity contracts as of December 31, 2021. (in millions) 2022 2023 2024 2025 2026 Thereafter Total Duke Energy Ohio $ 62 $ 37 $ 25 $ 16 $ 13 $ 47 $ 200 Piedmont 324 272 225 134 122 503 1,580

Leases

Leases	12 Months Ended
	Dec. 31, 2021
Leases [Abstract]
Leases	LEASESAs part of its operations, Duke Energy leases certain aircraft, space on communication towers, industrial equipment, fleet vehicles, fuel transportation (barges and railcars), land and office space under various terms and expiration dates. Additionally, Duke Energy Carolinas, Duke Energy Progress and Duke Energy Indiana have finance leases related to firm natural gas pipeline transportation capacity. Duke Energy Progress and Duke Energy Florida have entered into certain PPAs, which are classified as finance and operating leases. Duke Energy has certain lease agreements, which include variable lease payments that are based on the usage of an asset. These variable lease payments are not included in the measurement of the ROU assets or operating lease liabilities on the Consolidated Financial Statements. Certain Duke Energy lease agreements include options for renewal and early termination. The intent to renew a lease varies depending on the lease type and asset. Renewal options that are reasonably certain to be exercised are included in the lease measurements. The decision to terminate a lease early is dependent on various economic factors. No termination options have been included in any of the lease measurements. Duke Energy Carolinas entered into a sale-leaseback arrangement in December 2019, to construct and occupy an office tower. The lease agreement was evaluated as a sale-leaseback of real estate and it was determined that the transaction did not qualify for sale-leaseback accounting. As a result, the transaction is being accounted for as a financing. For this transaction, Duke Energy Carolinas will continue to record the real estate on the Consolidated Balance Sheets within Property, Plant and Equipment as if it were the legal owner and will continue to recognize depreciation expense over the estimated useful life. In addition, the failed sale-leaseback obligation is reported within Long-Term Debt on the Consolidated Balance Sheets, with the monthly lease payments commencing after the construction phase being split between interest expense and principal pay down of the debt. Duke Energy operates various renewable energy projects and sells the generated output to utilities, electric cooperatives, municipalities and commercial and industrial customers through long-term PPAs. In certain situations, these PPAs and the associated renewable energy projects qualify as operating leases. Rental income from these leases is accounted for as Nonregulated electric and other revenues in the Consolidated Statements of Operations. There are no minimum lease payments as all payments are contingent based on actual electricity generated by the renewable energy projects. Contingent lease payments were $259 million, $275 million and $264 million for the years ended December 31, 2021, 2020, and 2019, respectively. Renewable energy projects owned by Duke Energy and accounted for as operating leases had a cost basis of $3,339 million and $3,335 million and accumulated depreciation of $966 million and $848 million at December 31, 2021, and 2020, respectively. These assets are principally classified as nonregulated electric generation and transmission assets. Piedmont has certain agreements with Duke Energy Carolinas for the construction and transportation of natural gas pipelines to supply its natural gas plant needs. Piedmont accounts for these pipeline lateral contracts as sales-type leases since the present value of the sum of the lease payments equals the fair value of the assets. These pipeline lateral assets owned by Piedmont had a current net investment basis of $2 million as of December 31, 2021, and 2020, and a long-term net investment basis of $203 million and $205 million as of December 31, 2021, and 2020, respectively. These assets are classified in Other, within Current Assets and Other Noncurrent Assets, respectively, on Piedmont's Consolidated Balance Sheets. Duke Energy Carolinas accounts for the contracts as finance leases. The activity for these contracts is eliminated in consolidation at Duke Energy. The following tables present the components of lease expense. Year Ended December 31, 2021 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Operating lease expense (a) $ 250 $ 43 $ 155 $ 83 $ 72 $ 11 $ 18 $ 7 Short-term lease expense (a) 5 — 2 1 1 — 2 — Variable lease expense (a) 41 17 22 10 12 — — 1 Finance lease expense Amortization of leased assets (b) 219 5 37 18 19 — 1 — Interest on lease liabilities (c) 55 33 48 42 6 — — — Total finance lease expense 274 38 85 60 25 — 1 — Total lease expense $ 570 $ 98 $ 264 $ 154 $ 110 $ 11 $ 21 $ 8 (a) Included in Operations, maintenance and other or, for barges and railcars, Fuel used in electric generation and purchased power on the Consolidated Statements of Operations. (b) Included in Depreciation and amortization on the Consolidated Statements of Operations. (c) Included in Interest Expense on the Consolidated Statements of Operations. Year Ended December 31, 2020 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Operating lease expense (a) $ 283 $ 53 $ 162 $ 72 $ 90 $ 11 $ 19 $ 7 Short-term lease expense (a) 4 — 2 1 1 — 1 — Variable lease expense (a) 30 13 13 5 8 — 1 1 Finance lease expense Amortization of leased assets (b) 119 8 24 6 18 — 1 — Interest on lease liabilities (c) 61 30 44 37 7 — — — Total finance lease expense 180 38 68 43 25 — 1 — Total lease expense $ 497 $ 104 $ 245 $ 121 $ 124 $ 11 $ 22 $ 8 (a) Included in Operations, maintenance and other or, for barges and railcars, Fuel used in electric generation and purchased power on the Consolidated Statements of Operations. (b) Included in Depreciation and amortization on the Consolidated Statements of Operations. (c) Included in Interest Expense on the Consolidated Statements of Operations. The following table presents operating lease maturities and a reconciliation of the undiscounted cash flows to operating lease liabilities. December 31, 2021 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont 2022 $ 225 $ 24 $ 118 $ 63 $ 55 $ 2 $ 6 $ 5 2023 212 21 118 64 54 2 6 5 2024 185 14 110 56 54 2 4 5 2025 156 10 96 42 54 2 4 5 2026 136 10 92 38 54 2 4 — Thereafter 594 42 290 220 70 16 50 — Total operating lease payments 1,508 121 824 483 341 26 74 20 Less: present value discount (247) (21) (124) (83) (41) (7) (20) (1) Total operating lease liabilities (a) $ 1,261 $ 100 $ 700 $ 400 $ 300 $ 19 $ 54 $ 19 (a) Certain operating lease payments include renewal options that are reasonably certain to be exercised. The following table presents finance lease maturities and a reconciliation of the undiscounted cash flows to finance lease liabilities. December 31, 2021 Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Indiana 2022 $ 201 $ 38 $ 111 $ 86 $ 25 $ 1 2023 198 38 103 78 25 1 2024 143 38 88 79 9 1 2025 76 38 85 80 5 1 2026 77 38 86 81 5 1 Thereafter 658 464 637 636 1 24 Total finance lease payments 1,353 654 1,110 1,040 70 29 Less: amounts representing interest (438) (365) (420) (411) (9) (19) Total finance lease liabilities $ 915 $ 289 $ 690 $ 629 $ 61 $ 10 The following tables contain additional information related to leases. December 31, 2021 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Classification Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Assets Operating Operating lease ROU assets, net $ 1,266 $ 92 $ 691 $ 389 $ 302 $ 19 $ 53 $ 16 Finance Net property, plant and equipment 950 302 729 627 102 — 7 — Total lease assets $ 2,216 $ 394 $ 1,420 $ 1,016 $ 404 $ 19 $ 60 $ 16 Liabilities Current Operating Other current liabilities $ 187 $ 22 $ 94 $ 50 $ 44 $ 1 $ 4 $ 5 Finance Current maturities of long-term debt 151 6 61 41 20 — — — Noncurrent Operating Operating lease liabilities 1,074 78 606 350 256 18 50 14 Finance Long-Term Debt 764 283 629 588 41 — 10 — Total lease liabilities $ 2,176 $ 389 $ 1,390 $ 1,029 $ 361 $ 19 $ 64 $ 19 December 31, 2020 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Classification Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Assets Operating Operating lease ROU assets, net $ 1,524 $ 110 $ 690 $ 346 $ 344 $ 20 $ 55 $ 20 Finance Net property, plant and equipment 797 312 416 297 119 — 7 — Total lease assets $ 2,321 $ 422 $ 1,106 $ 643 $ 463 $ 20 $ 62 $ 20 Liabilities Current Operating Other current liabilities $ 177 $ 20 $ 73 $ 31 $ 42 $ 1 $ 3 $ 4 Finance Current maturities of long-term debt 129 5 26 7 19 — — — Noncurrent Operating Operating lease liabilities 1,340 97 623 323 300 20 53 19 Finance Long-Term Debt 716 289 351 289 62 — 10 — Total lease liabilities $ 2,362 $ 411 $ 1,073 $ 650 $ 423 $ 21 $ 66 $ 23 Year Ended December 31, 2021 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Cash paid for amounts included in the measurement of lease liabilities (a) Operating cash flows from operating leases $ 245 $ 25 $ 117 $ 62 $ 55 $ 2 $ 6 $ 5 Operating cash flows from finance leases 55 33 48 42 6 — — — Financing cash flows from finance leases 219 5 37 18 19 — 1 — Lease assets obtained in exchange for new lease liabilities (non-cash) Operating (b) $ 182 $ 4 $ 99 $ 99 $ — $ — $ — $ — Finance 322 — 322 322 — — — — (a) No amounts were classified as investing cash flows from operating leases for the year ended December 31, 2021. (b) Does not include ROU assets recorded as a result of the adoption of the new lease standard. Year Ended December 31, 2020 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Cash paid for amounts included in the measurement of lease liabilities (a) Operating cash flows from operating leases $ 271 $ 31 $ 124 $ 52 $ 72 $ 2 $ 6 $ 5 Operating cash flows from finance leases 61 30 44 37 7 — — — Financing cash flows from finance leases 119 8 24 6 18 — 1 — Lease assets obtained in exchange for new lease liabilities (non-cash) Operating (b) $ 116 $ 17 $ — $ — $ — $ — $ 1 $ — Finance 125 125 — — — — — — (a) No amounts were classified as investing cash flows from operating leases for the year ended December 31, 2020. (b) Does not include ROU assets recorded as a result of the adoption of the new lease standard. December 31, 2021 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Weighted average remaining lease term (years) Operating leases 9 9 8 10 7 16 16 4 Finance leases 10 18 13 13 11 — 24 — Weighted average discount rate (a) Operating leases 3.6 % 3.5 % 3.6 % 3.4 % 3.8 % 4.2 % 4.1 % 3.6 % Finance leases 7.3 % 11.6 % 9.0 % 9.0 % 8.2 % — % 11.9 % — % (a) The discount rate is calculated using the rate implicit in a lease if it is readily determinable. Generally, the rate used by the lessor is not provided to Duke Energy and in these cases the incremental borrowing rate is used. Duke Energy will typically use its fully collateralized incremental borrowing rate as of the commencement date to calculate and record the lease. The incremental borrowing rate is influenced by the lessee’s credit rating and lease term and as such may differ for individual leases, embedded leases or portfolios of leased assets. December 31, 2020 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Weighted average remaining lease term (years) Operating leases 10 9 10 12 8 17 18 5 Finance leases 13 19 15 17 11 — 25 — Weighted average discount rate (a) Operating leases 3.8 % 3.4 % 3.8 % 3.9 % 3.8 % 4.2 % 4.2 % 3.6 % Finance leases 8.4 % 11.6 % 11.9 % 12.4 % 8.2 % — % 11.9 % — % (a) The discount rate is calculated using the rate implicit in a lease if it is readily determinable. Generally, the rate used by the lessor is not provided to Duke Energy and in these cases the incremental borrowing rate is used. Duke Energy will typically use its fully collateralized incremental borrowing rate as of the commencement date to calculate and record the lease. The incremental borrowing rate is influenced by the lessee’s credit rating and lease term and as such may differ for individual leases, embedded leases or portfolios of leased assets.
Leases	LEASESAs part of its operations, Duke Energy leases certain aircraft, space on communication towers, industrial equipment, fleet vehicles, fuel transportation (barges and railcars), land and office space under various terms and expiration dates. Additionally, Duke Energy Carolinas, Duke Energy Progress and Duke Energy Indiana have finance leases related to firm natural gas pipeline transportation capacity. Duke Energy Progress and Duke Energy Florida have entered into certain PPAs, which are classified as finance and operating leases. Duke Energy has certain lease agreements, which include variable lease payments that are based on the usage of an asset. These variable lease payments are not included in the measurement of the ROU assets or operating lease liabilities on the Consolidated Financial Statements. Certain Duke Energy lease agreements include options for renewal and early termination. The intent to renew a lease varies depending on the lease type and asset. Renewal options that are reasonably certain to be exercised are included in the lease measurements. The decision to terminate a lease early is dependent on various economic factors. No termination options have been included in any of the lease measurements. Duke Energy Carolinas entered into a sale-leaseback arrangement in December 2019, to construct and occupy an office tower. The lease agreement was evaluated as a sale-leaseback of real estate and it was determined that the transaction did not qualify for sale-leaseback accounting. As a result, the transaction is being accounted for as a financing. For this transaction, Duke Energy Carolinas will continue to record the real estate on the Consolidated Balance Sheets within Property, Plant and Equipment as if it were the legal owner and will continue to recognize depreciation expense over the estimated useful life. In addition, the failed sale-leaseback obligation is reported within Long-Term Debt on the Consolidated Balance Sheets, with the monthly lease payments commencing after the construction phase being split between interest expense and principal pay down of the debt. Duke Energy operates various renewable energy projects and sells the generated output to utilities, electric cooperatives, municipalities and commercial and industrial customers through long-term PPAs. In certain situations, these PPAs and the associated renewable energy projects qualify as operating leases. Rental income from these leases is accounted for as Nonregulated electric and other revenues in the Consolidated Statements of Operations. There are no minimum lease payments as all payments are contingent based on actual electricity generated by the renewable energy projects. Contingent lease payments were $259 million, $275 million and $264 million for the years ended December 31, 2021, 2020, and 2019, respectively. Renewable energy projects owned by Duke Energy and accounted for as operating leases had a cost basis of $3,339 million and $3,335 million and accumulated depreciation of $966 million and $848 million at December 31, 2021, and 2020, respectively. These assets are principally classified as nonregulated electric generation and transmission assets. Piedmont has certain agreements with Duke Energy Carolinas for the construction and transportation of natural gas pipelines to supply its natural gas plant needs. Piedmont accounts for these pipeline lateral contracts as sales-type leases since the present value of the sum of the lease payments equals the fair value of the assets. These pipeline lateral assets owned by Piedmont had a current net investment basis of $2 million as of December 31, 2021, and 2020, and a long-term net investment basis of $203 million and $205 million as of December 31, 2021, and 2020, respectively. These assets are classified in Other, within Current Assets and Other Noncurrent Assets, respectively, on Piedmont's Consolidated Balance Sheets. Duke Energy Carolinas accounts for the contracts as finance leases. The activity for these contracts is eliminated in consolidation at Duke Energy. The following tables present the components of lease expense. Year Ended December 31, 2021 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Operating lease expense (a) $ 250 $ 43 $ 155 $ 83 $ 72 $ 11 $ 18 $ 7 Short-term lease expense (a) 5 — 2 1 1 — 2 — Variable lease expense (a) 41 17 22 10 12 — — 1 Finance lease expense Amortization of leased assets (b) 219 5 37 18 19 — 1 — Interest on lease liabilities (c) 55 33 48 42 6 — — — Total finance lease expense 274 38 85 60 25 — 1 — Total lease expense $ 570 $ 98 $ 264 $ 154 $ 110 $ 11 $ 21 $ 8 (a) Included in Operations, maintenance and other or, for barges and railcars, Fuel used in electric generation and purchased power on the Consolidated Statements of Operations. (b) Included in Depreciation and amortization on the Consolidated Statements of Operations. (c) Included in Interest Expense on the Consolidated Statements of Operations. Year Ended December 31, 2020 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Operating lease expense (a) $ 283 $ 53 $ 162 $ 72 $ 90 $ 11 $ 19 $ 7 Short-term lease expense (a) 4 — 2 1 1 — 1 — Variable lease expense (a) 30 13 13 5 8 — 1 1 Finance lease expense Amortization of leased assets (b) 119 8 24 6 18 — 1 — Interest on lease liabilities (c) 61 30 44 37 7 — — — Total finance lease expense 180 38 68 43 25 — 1 — Total lease expense $ 497 $ 104 $ 245 $ 121 $ 124 $ 11 $ 22 $ 8 (a) Included in Operations, maintenance and other or, for barges and railcars, Fuel used in electric generation and purchased power on the Consolidated Statements of Operations. (b) Included in Depreciation and amortization on the Consolidated Statements of Operations. (c) Included in Interest Expense on the Consolidated Statements of Operations. The following table presents operating lease maturities and a reconciliation of the undiscounted cash flows to operating lease liabilities. December 31, 2021 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont 2022 $ 225 $ 24 $ 118 $ 63 $ 55 $ 2 $ 6 $ 5 2023 212 21 118 64 54 2 6 5 2024 185 14 110 56 54 2 4 5 2025 156 10 96 42 54 2 4 5 2026 136 10 92 38 54 2 4 — Thereafter 594 42 290 220 70 16 50 — Total operating lease payments 1,508 121 824 483 341 26 74 20 Less: present value discount (247) (21) (124) (83) (41) (7) (20) (1) Total operating lease liabilities (a) $ 1,261 $ 100 $ 700 $ 400 $ 300 $ 19 $ 54 $ 19 (a) Certain operating lease payments include renewal options that are reasonably certain to be exercised. The following table presents finance lease maturities and a reconciliation of the undiscounted cash flows to finance lease liabilities. December 31, 2021 Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Indiana 2022 $ 201 $ 38 $ 111 $ 86 $ 25 $ 1 2023 198 38 103 78 25 1 2024 143 38 88 79 9 1 2025 76 38 85 80 5 1 2026 77 38 86 81 5 1 Thereafter 658 464 637 636 1 24 Total finance lease payments 1,353 654 1,110 1,040 70 29 Less: amounts representing interest (438) (365) (420) (411) (9) (19) Total finance lease liabilities $ 915 $ 289 $ 690 $ 629 $ 61 $ 10 The following tables contain additional information related to leases. December 31, 2021 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Classification Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Assets Operating Operating lease ROU assets, net $ 1,266 $ 92 $ 691 $ 389 $ 302 $ 19 $ 53 $ 16 Finance Net property, plant and equipment 950 302 729 627 102 — 7 — Total lease assets $ 2,216 $ 394 $ 1,420 $ 1,016 $ 404 $ 19 $ 60 $ 16 Liabilities Current Operating Other current liabilities $ 187 $ 22 $ 94 $ 50 $ 44 $ 1 $ 4 $ 5 Finance Current maturities of long-term debt 151 6 61 41 20 — — — Noncurrent Operating Operating lease liabilities 1,074 78 606 350 256 18 50 14 Finance Long-Term Debt 764 283 629 588 41 — 10 — Total lease liabilities $ 2,176 $ 389 $ 1,390 $ 1,029 $ 361 $ 19 $ 64 $ 19 December 31, 2020 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Classification Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Assets Operating Operating lease ROU assets, net $ 1,524 $ 110 $ 690 $ 346 $ 344 $ 20 $ 55 $ 20 Finance Net property, plant and equipment 797 312 416 297 119 — 7 — Total lease assets $ 2,321 $ 422 $ 1,106 $ 643 $ 463 $ 20 $ 62 $ 20 Liabilities Current Operating Other current liabilities $ 177 $ 20 $ 73 $ 31 $ 42 $ 1 $ 3 $ 4 Finance Current maturities of long-term debt 129 5 26 7 19 — — — Noncurrent Operating Operating lease liabilities 1,340 97 623 323 300 20 53 19 Finance Long-Term Debt 716 289 351 289 62 — 10 — Total lease liabilities $ 2,362 $ 411 $ 1,073 $ 650 $ 423 $ 21 $ 66 $ 23 Year Ended December 31, 2021 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Cash paid for amounts included in the measurement of lease liabilities (a) Operating cash flows from operating leases $ 245 $ 25 $ 117 $ 62 $ 55 $ 2 $ 6 $ 5 Operating cash flows from finance leases 55 33 48 42 6 — — — Financing cash flows from finance leases 219 5 37 18 19 — 1 — Lease assets obtained in exchange for new lease liabilities (non-cash) Operating (b) $ 182 $ 4 $ 99 $ 99 $ — $ — $ — $ — Finance 322 — 322 322 — — — — (a) No amounts were classified as investing cash flows from operating leases for the year ended December 31, 2021. (b) Does not include ROU assets recorded as a result of the adoption of the new lease standard. Year Ended December 31, 2020 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Cash paid for amounts included in the measurement of lease liabilities (a) Operating cash flows from operating leases $ 271 $ 31 $ 124 $ 52 $ 72 $ 2 $ 6 $ 5 Operating cash flows from finance leases 61 30 44 37 7 — — — Financing cash flows from finance leases 119 8 24 6 18 — 1 — Lease assets obtained in exchange for new lease liabilities (non-cash) Operating (b) $ 116 $ 17 $ — $ — $ — $ — $ 1 $ — Finance 125 125 — — — — — — (a) No amounts were classified as investing cash flows from operating leases for the year ended December 31, 2020. (b) Does not include ROU assets recorded as a result of the adoption of the new lease standard. December 31, 2021 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Weighted average remaining lease term (years) Operating leases 9 9 8 10 7 16 16 4 Finance leases 10 18 13 13 11 — 24 — Weighted average discount rate (a) Operating leases 3.6 % 3.5 % 3.6 % 3.4 % 3.8 % 4.2 % 4.1 % 3.6 % Finance leases 7.3 % 11.6 % 9.0 % 9.0 % 8.2 % — % 11.9 % — % (a) The discount rate is calculated using the rate implicit in a lease if it is readily determinable. Generally, the rate used by the lessor is not provided to Duke Energy and in these cases the incremental borrowing rate is used. Duke Energy will typically use its fully collateralized incremental borrowing rate as of the commencement date to calculate and record the lease. The incremental borrowing rate is influenced by the lessee’s credit rating and lease term and as such may differ for individual leases, embedded leases or portfolios of leased assets. December 31, 2020 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Weighted average remaining lease term (years) Operating leases 10 9 10 12 8 17 18 5 Finance leases 13 19 15 17 11 — 25 — Weighted average discount rate (a) Operating leases 3.8 % 3.4 % 3.8 % 3.9 % 3.8 % 4.2 % 4.2 % 3.6 % Finance leases 8.4 % 11.6 % 11.9 % 12.4 % 8.2 % — % 11.9 % — % (a) The discount rate is calculated using the rate implicit in a lease if it is readily determinable. Generally, the rate used by the lessor is not provided to Duke Energy and in these cases the incremental borrowing rate is used. Duke Energy will typically use its fully collateralized incremental borrowing rate as of the commencement date to calculate and record the lease. The incremental borrowing rate is influenced by the lessee’s credit rating and lease term and as such may differ for individual leases, embedded leases or portfolios of leased assets.

Debt and Credit Facilities

Debt and Credit Facilities	12 Months Ended
	Dec. 31, 2021
Debt Disclosure [Abstract]
Debt and Credit Facilities	DEBT AND CREDIT FACILITIES Summary of Debt and Related Terms The following tables summarize outstanding debt. December 31, 2021 Weighted Average Duke Duke Duke Duke Duke Interest Duke Energy Progress Energy Energy Energy Energy (in millions) Rate Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Unsecured debt, maturing 2022-2082 3.71 % $ 24,564 $ 1,150 $ 2,250 $ — $ 150 $ 1,330 $ 700 $ 2,990 Secured debt, maturing 2022-2052 2.50 % 5,584 1,094 2,397 1,120 1,278 — — — First mortgage bonds, maturing 2022-2051 (a) 3.87 % 31,026 10,507 15,450 8,375 7,075 1,850 3,219 — Finance leases, maturing 2022-2051 (b) 5.81 % 915 289 690 629 61 — 10 — Tax-exempt bonds, maturing 2027-2041 (c) 0.65 % 360 — 48 48 — 27 285 — Notes payable and commercial paper (d) 0.35 % 3,929 — — — — — — — Money pool/intercompany borrowings — 526 2,959 322 199 128 150 518 Fair value hedge carrying value adjustment 4 4 — — — — — — Unamortized debt discount and premium, net (e) 1,119 (21) (34) (19) (14) (27) (18) (6) Unamortized debt issuance costs (f) (362) (67) (128) (54) (68) (13) (23) (16) Total debt 3.50 % $ 67,139 $ 13,482 $ 23,632 $ 10,421 $ 8,681 $ 3,295 $ 4,323 $ 3,486 Short-term notes payable and commercial paper (3,304) — — — — — — — Short-term money pool/intercompany borrowings — (226) (2,809) (172) (199) (103) — (518) Current maturities of long-term debt (g) (3,387) (362) (1,082) (556) (76) — (84) — Total long-term debt (g) $ 60,448 $ 12,894 $ 19,741 $ 9,693 $ 8,406 $ 3,192 $ 4,239 $ 2,968 (a) Substantially all electric utility property is mortgaged under mortgage bond indentures. (b) Duke Energy includes $256 million of finance lease purchase accounting adjustments related to Duke Energy Florida related to PPAs that are not accounted for as finance leases in their respective financial statements because of grandfathering provisions in GAAP. (c) Substantially all tax-exempt bonds are secured by first mortgage bonds, letters of credit or the Master Credit Facility. (d) Includes $625 million classified as Long-Term Debt on the Consolidated Balance Sheets due to the existence of long-term credit facilities that backstop these commercial paper balances, along with Duke Energy’s ability and intent to refinance these balances on a long-term basis. The weighted average days to maturity for Duke Energy's commercial paper program was 15 days. (e) Duke Energy includes $1,121 million and $100 million in purchase accounting adjustments related to Progress Energy and Piedmont, respectively. (f) Duke Energy includes $29 million in purchase accounting adjustments primarily related to the merger with Progress Energy. (g) Refer to Note 17 for additional information on amounts from consolidated VIEs. December 31, 2020 Weighted Average Duke Duke Duke Duke Duke Interest Duke Energy Progress Energy Energy Energy Energy (in millions) Rate Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Unsecured debt, maturing 2021-2078 3.71 % $ 23,669 $ 1,150 $ 3,150 $ 700 $ 350 $ 1,180 $ 403 $ 2,800 Secured debt, maturing 2021-2052 2.67 % 4,270 543 1,584 252 1,332 — — — First mortgage bonds, maturing 2021-2050 (a) 4.00 % 29,177 10,008 14,100 7,875 6,225 1,850 3,219 — Finance leases, maturing 2022-2051 (b) 6.96 % 845 294 377 296 81 — 10 — Tax-exempt bonds, maturing 2027-2041 (c) 0.75 % 477 — 48 48 — 77 352 — Notes payable and commercial paper (d) 0.51 % 3,407 — — — — — — — Money pool/intercompany borrowings — 806 3,119 445 196 194 281 530 Fair value hedge carrying value adjustment 4 4 — — — — — — Unamortized debt discount and premium, net (e) 1,217 (20) (31) (19) (11) (29) (18) (5) Unamortized debt issuance costs (f) (330) (62) (113) (44) (62) (14) (25) (15) Total debt 3.62 % $ 62,736 $ 12,723 $ 22,234 $ 9,553 $ 8,111 $ 3,258 $ 4,222 $ 3,310 Short-term notes payable and commercial paper (2,873) — — — — — — — Short-term money pool/intercompany borrowings — (506) (2,969) (295) (196) (169) (131) (530) Current maturities of long-term debt (g) (4,238) (506) (1,426) (603) (823) (50) (70) (160) Total long-term debt (g) $ 55,625 $ 11,711 $ 17,839 $ 8,655 $ 7,092 $ 3,039 $ 4,021 $ 2,620 (a) Substantially all electric utility property is mortgaged under mortgage bond indentures. (b) Duke Energy includes $24 million and $341 million of finance lease purchase accounting adjustments related to Duke Energy Progress and Duke Energy Florida, respectively, related to PPAs that are not accounted for as finance leases in their respective financial statements because of grandfathering provisions in GAAP. (c) Substantially all tax-exempt bonds are secured by first mortgage bonds, letters of credit or the Master Credit Facility. (d) Includes $625 million that was classified as Long-Term Debt on the Consolidated Balance Sheets due to the existence of long-term credit facilities that backstop these commercial paper balances, along with Duke Energy’s ability and intent to refinance these balances on a long-term basis. The weighted average days to maturity for Duke Energy's commercial paper programs was 23 days. (e) Duke Energy includes $1,196 million and $117 million in purchase accounting adjustments related to Progress Energy and Piedmont, respectively. (f) Duke Energy includes $33 million in purchase accounting adjustments primarily related to the merger with Progress Energy. (g) Refer to Note 17 for additional information on amounts from consolidated VIEs. Current Maturities of Long-Term Debt The following table shows the significant components of Current maturities of Long-Term Debt on the Consolidated Balance Sheets. The Duke Energy Registrants currently anticipate satisfying these obligations with cash on hand and proceeds from additional borrowings. (in millions) Maturity Date Interest Rate December 31, 2021 Unsecured Debt (a) Duke Energy (Parent) March 2022 3.227 % 300 Duke Energy (Parent) (b) March 2022 0.851 % 300 Progress Energy April 2022 3.150 % 450 Duke Energy (Parent) August 2022 3.050 % 500 Duke Energy (Parent) August 2022 2.400 % 500 First Mortgage Bonds Duke Energy Indiana January 2022 8.850 % 53 Duke Energy Carolinas May 2022 3.350 % 350 Duke Energy Progress May 2022 2.800 % 500 Other (c) 434 Current maturities of long-term debt $ 3,387 (a) In December 2021, Duke Energy Progress early retired $700 million of unsecured debt with an original maturity date of February 2022. (b) Debt has a floating interest rate. (c) Includes finance lease obligations, amortizing debt and small bullet maturities. Maturities and Call Options The following table shows the annual maturities of long-term debt for the next five years and thereafter. Amounts presented exclude short-term notes payable, commercial paper and money pool borrowings and debt issuance costs for the Subsidiary Registrants. December 31, 2021 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy (a) Carolinas Energy Progress Florida Ohio Indiana Piedmont 2022 $ 3,387 $ 362 $ 1,082 $ 556 $ 76 $ — $ 84 $ — 2023 4,725 1,018 1,046 719 327 475 303 45 2024 1,917 19 138 72 66 — 4 40 2025 3,078 496 639 575 64 245 4 205 2026 3,125 921 310 229 81 70 154 40 Thereafter 46,844 10,528 17,766 8,168 7,949 2,442 3,814 2,660 Total long-term debt, including current maturities $ 63,076 $ 13,344 $ 20,981 $ 10,319 $ 8,563 $ 3,232 $ 4,363 $ 2,990 (a) Excludes $1,250 million in purchase accounting adjustments related to the Progress Energy merger and the Piedmont acquisition. The Duke Energy Registrants have the ability under certain debt facilities to call and repay the obligation prior to its scheduled maturity. Therefore, the actual timing of future cash repayments could be materially different than as presented above. Short-Term Obligations Classified as Long-Term Debt Tax-exempt bonds that may be put to the Duke Energy Registrants at the option of the holder and certain commercial paper issuances and money pool borrowings are classified as Long-Term Debt on the Consolidated Balance Sheets. These tax-exempt bonds, commercial paper issuances and money pool borrowings, which are short-term obligations by nature, are classified as long-term due to Duke Energy’s intent and ability to utilize such borrowings as long-term financing. As Duke Energy’s Master Credit Facility and other bilateral letter of credit agreements have non-cancelable terms in excess of one year as of the balance sheet date, Duke Energy has the ability to refinance these short-term obligations on a long-term basis. The following tables show short-term obligations classified as long-term debt. December 31, 2021 Duke Duke Duke Duke Duke Energy Energy Energy Energy (in millions) Energy Carolinas Progress Ohio Indiana Tax-exempt bonds $ 312 $ — $ — $ 27 $ 285 Commercial paper (a) 625 300 150 25 150 Total $ 937 $ 300 $ 150 $ 52 $ 435 December 31, 2020 Duke Duke Duke Duke Duke Energy Energy Energy Energy (in millions) Energy Carolinas Progress Ohio Indiana Tax-exempt bonds $ 312 $ — $ — $ 27 $ 285 Commercial paper (a) 625 300 150 25 150 Total $ 937 $ 300 $ 150 $ 52 $ 435 (a) Progress Energy amounts are equal to Duke Energy Progress amounts. Summary of Significant Debt Issuances The following tables summarize significant debt issuances (in millions). Year Ended December 31, 2021 Duke Duke Duke Duke Maturity Interest Duke Energy Energy Energy Energy Issuance Date Date Rate Energy (Parent) Carolinas Progress Florida Piedmont Unsecured Debt March 2021 a) March 2031 2.500 % $ 350 $ — $ — $ — $ — $ 350 June 2021 (b)(c) June 2023 0.299 % 500 500 — — — — June 2021 (c) June 2031 2.550 % 1,000 1,000 — — — — June 2021 (c) June 2041 3.300 % 750 750 — — — — June 2021 (c) June 2051 3.500 % 750 750 — — — — September 2021 (d) January 2082 3.250 % 500 500 Secured Debt November 2021 (e) July 2031 1.679 % 100 — 100 — — — November 2021 (e) July 2041 2.617 % 137 — 137 — — — November 2021 (e) July 2028 1.295 % 221 — — 221 — — November 2021 (e) July 2037 2.387 % 352 — — 352 — — November 2021 (e) July 2041 2.799 % 197 — — 197 — — First Mortgage Bonds April 2021 (f) April 2031 2.550 % 550 — 550 — — — April 2021 (f) April 2051 3.450 % 450 — 450 — — — August 2021 (g) August 2031 2.000 % 650 — — 650 — — August 2021 (g) August 2051 2.900 % 450 — — 450 — — December 2021 (h) December 2031 2.400 % 650 — — — 650 — December 2021 (h) December 2051 3.000 % 500 — — — 500 — Total issuances $ 8,107 $ 3,500 $ 1,237 $ 1,870 $ 1,150 $ 350 (a) Debt issued to repay at maturity $160 million senior unsecured notes due June 2021, pay down short-term debt and for general corporate purposes. (b) Debt has a floating interest rate. (c) Debt issued to repay $1.75 billion of Duke Energy (Parent) debt maturities, to repay a portion of short-term debt and for general corporate purposes. (d) Debt issued to repay in October 2021 $500 million of Duke Energy (Parent) unsecured notes. The interest rate resets every five years. (e) Debt issued to finance the North Carolina portion of storm restoration expenditures related to Hurricane Florence, Hurricane Michael, Hurricane Dorian and Winter Storm Diego. (f) Debt issued to repay at maturity $500 million first mortgage bonds due June 2021, pay down short-term debt and for general company purposes. (g) Debt issued to repay at maturity a total of $600 million first mortgage bonds due September 2021, pay down short-term debt and for general company purposes. (h) Proceeds will be used to finance or refinance, in whole or in part, existing or new eligible projects under the sustainable financing framework. Year Ended December 31, 2020 Duke Duke Duke Duke Duke Duke Maturity Interest Duke Energy Energy Energy Energy Energy Energy Issuance Date Date Rate Energy (Parent) Carolinas Progress Florida Ohio Indiana Piedmont Unsecured Debt May 2020 (a) June 2030 2.450 % $ 500 $ 500 $ — $ — $ — $ — $ — $ — May 2020 (b) June 2050 3.350 % 400 — — — — — — 400 August 2020 (c)(d) February 2022 0.400 % 700 — — 700 — — — — September 2020 (e) September 2025 0.900 % 650 650 — — — — — — September 2020 (e) June 2030 2.450 % 350 350 — — — — — — First Mortgage Bonds January 2020 (f) February 2030 2.450 % 500 — 500 — — — — — January 2020 (f) August 2049 3.200 % 400 — 400 — — — — — March 2020 (g) April 2050 2.750 % 550 — — — — — 550 — May 2020 (b) June 2030 2.125 % 400 — — — — 400 — — June 2020 (b) June 2030 1.750 % 500 — — — 500 — — — August 2020 (h) August 2050 2.500 % 600 — — 600 — — — — Total issuances $ 5,550 $ 1,500 $ 900 $ 1,300 $ 500 $ 400 $ 550 $ 400 (a) Debt issued to repay $500 million borrowing made under Duke Energy (Parent) revolving credit facility in March 2020, and for general corporate purposes. (b) Debt issued to repay short-term debt and for general corporate purposes. (c) Debt issued to repay $700 million term loan due December 2020. (d) Debt issuance has a floating interest rate. (e) Debt issued to repay a portion of outstanding commercial paper, to repay a portion of Duke Energy (Parent)'s outstanding $1.7 billion term loan due March 2021 and for general corporate purposes. (f) Debt issued to repay at maturity $450 million first mortgage bonds due June 2020 and for general corporate purposes. (g) Debt issued to repay at maturity $500 million first mortgage bonds due July 2020 and to pay down short-term debt. (h) Debt issued to repay at maturity $300 million first mortgage bonds due September 2020 and for general corporate purposes. AVAILABLE CREDIT FACILITIES Master Credit Facility In March 2021, Duke Energy amended its existing $8 billion Master Credit Facility to extend the termination date to March 2026. The Duke Energy Registrants, excluding Progress Energy, have borrowing capacity under the Master Credit Facility up to a specified sublimit for each borrower. Duke Energy has the unilateral ability at any time to increase or decrease the borrowing sublimits of each borrower, subject to a maximum sublimit for each borrower. The amount available under the Master Credit Facility has been reduced to backstop issuances of commercial paper, certain letters of credit and variable-rate demand tax-exempt bonds that may be put to the Duke Energy Registrants at the option of the holder. The table below includes the current borrowing sublimits and available capacity under these credit facilities. December 31, 2021 Duke Duke Duke Duke Duke Duke Duke Energy Energy Energy Energy Energy Energy (in millions) Energy (Parent) Carolinas Progress Florida Ohio Indiana Piedmont Facility size (a) $ 8,000 $ 2,650 $ 1,225 $ 1,150 $ 900 $ 775 $ 600 $ 700 Reduction to backstop issuances Commercial paper (b) (2,863) (1,128) (506) (307) (181) (119) (150) (472) Outstanding letters of credit (38) (25) (4) (2) (7) — — — Tax-exempt bonds (81) — — — — — (81) — Available capacity $ 5,018 $ 1,497 $ 715 $ 841 $ 712 $ 656 $ 369 $ 228 (a) Represents the sublimit of each borrower. (b) Duke Energy issued $625 million of commercial paper and loaned the proceeds through the money pool to Duke Energy Carolinas, Duke Energy Progress, Duke Energy Ohio and Duke Energy Indiana. The balances are classified as Long-Term Debt Payable to Affiliated Companies in the Consolidated Balance Sheets. Three-Year Revolving Credit Facility Duke Energy (Parent) has a $1 billion revolving credit facility. In March 2021, Duke Energy extended the termination date of the facility from May 2022 to May 2024. Borrowings under this facility will be used for general corporate purposes. As of December 31, 2021, $500 million has been drawn under this facility. This balance is classified as Long-term debt on Duke Energy's Consolidated Balance Sheets. Any undrawn commitments can be drawn, and borrowings can be prepaid, at any time throughout the term of the facility. During the first quarter of 2020, an additional $500 million was drawn under this facility to manage liquidity impacts from COVID-19. The additional $500 million was paid down during the second quarter of 2020. The terms and conditions of the facility are generally consistent with those governing Duke Energy's Master Credit Facility. Duke Energy Ohio Term Loan Facility In October 2021, Duke Energy Ohio entered into a two-year term loan facility with commitments totaling $100 million. Borrowings under the facility will be used to pay down short-term debt and for general corporate purposes. The term loan was fully drawn at the time of closing in October. The balance is classified as Long-Term Debt on Duke Energy Ohio’s Consolidated Balance Sheets. Duke Energy Indiana Term Loan Facility In October 2021, Duke Energy Indiana entered into a two-year term loan facility with commitments totaling $300 million. Borrowings under the facility will be used to pay down short-term debt and for general corporate purposes. The term loan was fully drawn at the time of closing in October. The balance is classified as Long-Term Debt on Duke Energy Indiana’s Consolidated Balance Sheets. Duke Energy Kentucky Term Loan Facility In October 2021, Duke Energy Kentucky entered into a two-year term loan facility with commitments totaling $50 million. Borrowings under the facility will be used to pay down short-term debt and for general corporate purposes. The term loan was fully drawn at the time of closing in October. The balance is classified as Long-Term Debt on Duke Energy Ohio’s Consolidated Balance Sheets. Other Debt Matters In September 2019, Duke Energy filed a Form S-3 with the SEC. Under this Form S-3, which is uncapped, the Duke Energy Registrants, excluding Progress Energy, may issue debt and other securities, including preferred stock, in the future at amounts, prices and with terms to be determined at the time of future offerings. The registration statement was filed to replace a similar prior filing upon expiration of its three-year term and also allows for the issuance of common and preferred stock by Duke Energy. Duke Energy has an effective Form S-3 with the SEC to sell up to $3 billion of variable denomination floating-rate demand notes, called PremierNotes. The Form S-3 states that no more than $1.5 billion of the notes will be outstanding at any particular time. The notes are offered on a continuous basis and bear interest at a floating rate per annum determined by the Duke Energy PremierNotes Committee, or its designee, on a weekly basis. The interest rate payable on notes held by an investor may vary based on the principal amount of the investment. The notes have no stated maturity date, are non-transferable and may be redeemed in whole or in part by Duke Energy or at the investor’s option at any time. The balance as of December 31, 2021, and 2020, was $1,066 million and $1,168 million, respectively. The notes are short-term debt obligations of Duke Energy and are reflected as Notes payable and commercial paper on Duke Energy’s Consolidated Balance Sheets. Money Pool and Intercompany Credit Agreements The Subsidiary Registrants, excluding Progress Energy, are eligible to receive support for their short-term borrowing needs through participation with Duke Energy and certain of its subsidiaries in a money pool arrangement. Under this arrangement, those companies with short-term funds may provide short-term loans to affiliates participating in this arrangement. The money pool is structured such that the Subsidiary Registrants, excluding Progress Energy, separately manage their cash needs and working capital requirements. Accordingly, there is no net settlement of receivables and payables between money pool participants. Duke Energy (Parent), may loan funds to its participating subsidiaries, but may not borrow funds through the money pool. Accordingly, as the money pool activity is between Duke Energy and its wholly owned subsidiaries, all money pool balances are eliminated within Duke Energy’s Consolidated Balance Sheets. Money pool receivable balances are reflected within Notes receivable from affiliated companies on the Subsidiary Registrants’ Consolidated Balance Sheets. Money pool payable balances are reflected within either Notes payable to affiliated companies or Long-Term Debt Payable to Affiliated Companies on the Subsidiary Registrants’ Consolidated Balance Sheets. Progress Energy has a revolving credit agreement with Duke Energy (Parent) which allows up to $2.5 billion in intercompany borrowings. The balance is reflected within Notes payable to affiliated companies on the Progress Energy Consolidated Balance Sheets. Restrictive Debt Covenants The Duke Energy Registrants’ debt and credit agreements contain various financial and other covenants. Duke Energy's Master Credit Facility contains a covenant requiring the debt-to-total capitalization ratio not to exceed 65% for each borrower, excluding Piedmont, and 70% for Piedmont. Failure to meet those covenants beyond applicable grace periods could result in accelerated due dates and/or termination of the agreements. As of December 31, 2021, each of the Duke Energy Registrants was in compliance with all covenants related to their debt agreements. In addition, some credit agreements may allow for acceleration of payments or termination of the agreements due to nonpayment, or acceleration of other significant indebtedness of the borrower or some of its subsidiaries. None of the debt or credit agreements contain material adverse change clauses. Other Loans As of December 31, 2021, and 2020, Duke Energy had loans outstanding of $819 million, including $34 million at Duke Energy Progress and $817 million, including $35 million at Duke Energy Progress, respectively, against the cash surrender value of life insurance policies it owns on the lives of its executives. The amounts outstanding were carried as a reduction of the related cash surrender value that is included in Other within Other Noncurrent Assets on the Consolidated Balance Sheets.

Guarantees and Indemnifications

Guarantees and Indemnifications	12 Months Ended
	Dec. 31, 2021
Guarantees [Abstract]
Guarantees and Indemnifications	GUARANTEES AND INDEMNIFICATIONS Duke Energy has various financial and performance guarantees and indemnifications with non-consolidated entities, which are issued in the normal course of business. As discussed below, these contracts include performance guarantees, standby letters of credit, debt guarantees and indemnifications. Duke Energy enters into these arrangements to facilitate commercial transactions with third parties by enhancing the value of the transaction to the third party. At December 31, 2021, Duke Energy does not believe conditions are likely for significant performance under these guarantees. To the extent liabilities are incurred as a result of the activities covered by the guarantees, such liabilities are included on the accompanying Consolidated Balance Sheets. On January 2, 2007, Duke Energy completed the spin-off of its previously wholly owned natural gas businesses to shareholders. Guarantees issued by Duke Energy or its affiliates, or assigned to Duke Energy prior to the spin-off, remained with Duke Energy subsequent to the spin-off. Guarantees issued by Spectra Energy Capital, LLC (Spectra Capital) or its affiliates prior to the spin-off remained with Spectra Capital subsequent to the spin-off, except for guarantees that were later assigned to Duke Energy. Duke Energy has indemnified Spectra Capital against any losses incurred under certain of the guarantee obligations that remain with Spectra Capital. At December 31, 2021, the maximum potential amount of future payments associated with these guarantees were $48 million, the majority of which expire by 2028. In October 2017, ACP executed a $3.4 billion revolving credit facility with a stated maturity date of October 2021. Duke Energy entered into a guarantee agreement to support its share of the ACP revolving credit facility. In July 2020, ACP reduced the size of the credit facility to $1.9 billion. Duke Energy's maximum exposure to loss under the terms of the guarantee was $860 million as of December 31, 2020. This amount represented 47% of the outstanding borrowings under the credit facility and was recognized within Other Current Liabilities on the Consolidated Balance Sheets at December 31, 2020, of which $95 million was previously recognized due the adoption of new guidance for credit losses effective January 1, 2020. In February 2021, Duke Energy paid approximately $855 million to fund ACP's outstanding debt, relieving Duke Energy of its guarantee. See Notes 3 and 12 for more information. In addition to the Spectra Capital and ACP revolving credit facility guarantees above, Duke Energy has issued performance guarantees to customers and other third parties that guarantee the payment and performance of other parties, including certain non-wholly owned entities, as well as guarantees of debt of certain non-consolidated entities. If such entities were to default on payments or performance, Duke Energy would be required under the guarantees to make payments on the obligations of these entities. The maximum potential amount of future payments required under these guarantees as of December 31, 2021, was $53 million of which all expire between 2022 and 2030, with the remaining performance guarantees having no contractual expiration. Additionally, certain guarantees have uncapped maximum potential payments; however, Duke Energy does not believe these guarantees will have a material effect on its results of operations, cash flows or financial position. Duke Energy uses bank-issued standby letters of credit to secure the performance of wholly owned and non-wholly owned entities to a third party or customer. Under these arrangements, Duke Energy has payment obligations to the issuing bank that are triggered by a draw by the third party or customer due to the failure of the wholly owned or non-wholly owned entity to perform according to the terms of its underlying contract. At December 31, 2021, Duke Energy had issued a total of $586 million in letters of credit, which expire between 2022 and 2023. The unused amount under these letters of credit was $54 million.

Joint Ownership of Generating a

Joint Ownership of Generating and Transmission Facilities	12 Months Ended
	Dec. 31, 2021
Joint Ownership Of Generating And Transmission Facilities [Abstract]
Joint Ownership of Generating and Transmission Facilities	JOINT OWNERSHIP OF GENERATING AND TRANSMISSION FACILITIES The Duke Energy Registrants maintain ownership interests in certain jointly owned generating and transmission facilities. The Duke Energy Registrants are entitled to a share of the generating capacity and output of each unit equal to their respective ownership interests. The Duke Energy Registrants pay their ownership share of additional construction costs, fuel inventory purchases and operating expenses. The Duke Energy Registrants share of revenues and operating costs of the jointly owned facilities is included within the corresponding line in the Consolidated Statements of Operations. Each participant in the jointly owned facilities must provide its own financing. The following table presents the Duke Energy Registrants' interest of jointly owned plant or facilities and amounts included on the Consolidated Balance Sheets. All facilities are operated by the Duke Energy Registrants and are included in the Electric Utilities and Infrastructure segment. December 31, 2021 Construction Ownership Property, Plant Accumulated Work in (in millions except for ownership interest) Interest and Equipment Depreciation Progress Duke Energy Carolinas Catawba (units 1 and 2) (a) 19.25 % $ 1,044 $ 525 $ 20 W.S. Lee CC (b) 87.27 % 632 67 3 Duke Energy Indiana Gibson (unit 5) (c) 50.05 % 440 221 3 Vermillion (d) 62.50 % 175 108 5 Transmission and local facilities (c) Various 6,164 1,477 190 (a) Jointly owned with North Carolina Municipal Power Agency Number 1, NCEMC and PMPA. (b) Jointly owned with NCEMC. (c) Jointly owned with WVPA and IMPA. (d) Jointly owned with WVPA.

Asset Retirement Obligations

Asset Retirement Obligations	12 Months Ended
	Dec. 31, 2021
Asset Retirement Obligation Disclosure [Abstract]
Asset Retirement Obligations	ASSET RETIREMENT OBLIGATIONS Duke Energy records an ARO when it has a legal obligation to incur retirement costs associated with the retirement of a long-lived asset and the obligation can be reasonably estimated. Certain assets of the Duke Energy Registrants have an indeterminate life, such as transmission and distribution facilities, and thus the fair value of the retirement obligation is not reasonably estimable. A liability for these AROs will be recorded when a fair value is determinable. The Duke Energy Registrants’ regulated operations accrue costs of removal for property that does not have an associated legal retirement obligation based on regulatory orders from state commissions. These costs of removal are recorded as a regulatory liability in accordance with regulatory accounting treatment. The Duke Energy Registrants do not accrue the estimated cost of removal for any nonregulated assets. See Note 3 for the estimated cost of removal for assets without an associated legal retirement obligation, which are included in Regulatory liabilities on the Consolidated Balance Sheets. The following table presents the AROs recorded on the Consolidated Balance Sheets. December 31, 2021 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Decommissioning of nuclear power facilities (a) $ 7,046 $ 2,847 $ 4,156 $ 3,792 $ 364 $ — $ — $ — Closure of ash impoundments 5,293 2,390 1,872 1,839 33 82 949 — Other 437 64 84 44 40 54 38 22 Total asset retirement obligation $ 12,776 $ 5,301 $ 6,112 $ 5,675 $ 437 $ 136 $ 987 $ 22 Less: Current portion 647 249 275 274 1 13 110 — Total noncurrent asset retirement obligation $ 12,129 $ 5,052 $ 5,837 $ 5,401 $ 436 $ 123 $ 877 $ 22 (a) Duke Energy amount includes purchase accounting adjustments related to the merger with Progress Energy. Nuclear Decommissioning Liability AROs related to nuclear decommissioning are based on site-specific cost studies. The NCUC, PSCSC and FPSC require updated cost estimates for decommissioning nuclear plants every five years. The following table summarizes information about the most recent site-specific nuclear decommissioning cost studies. Decommissioning costs are stated in 2018 or 2019 dollars, depending on the year of the cost study, and include costs to decommission plant components not subject to radioactive contamination. Annual Funding Decommissioning (in millions) Requirement (a) Costs (a) Year of Cost Study Duke Energy $ 15 $ 9,105 2018 or 2019 Duke Energy Carolinas (b)(c) — 4,365 2018 Duke Energy Progress (d) 15 4,181 2019 Duke Energy Florida (e) — 559 N/A (a) Amount represents annual funding requirement for the current fiscal year. Amounts for Progress Energy equal the sum of Duke Energy Progress and Duke Energy Florida. (b) Decommissioning costs for Duke Energy Carolinas reflects its ownership interest in jointly owned reactors. Other joint owners are responsible for decommissioning costs related to their interest in the reactors. (c) Duke Energy Carolinas' site-specific nuclear decommissioning cost study completed in 2018 was filed with the NCUC and PSCSC in 2019. A new funding study was also completed and filed with the NCUC and PSCSC in 2019. (d) Duke Energy Progress' site-specific nuclear decommissioning cost study completed in 2019 was filed with the NCUC and PSCSC in March 2020. Duke Energy Progress also completed a funding study, which was filed with the NCUC and PSCSC in July 2020. In October 2021, Duke Energy Progress filed the 2019 nuclear decommissioning cost study with the FERC, as well as a revised rate schedule for decommissioning expense to be collected from wholesale customers. The FERC accepted the filing, as filed on December 9, 2021. (e) During 2019, Duke Energy Florida reached an agreement to transfer decommissioning work for Crystal River Unit 3 to a third party and decommissioning costs are based on the agreement with this third party rather than a cost study. Regulatory approval was received from the NRC and the FPSC in April 2020 and August 2020, respectively. Nuclear Decommissioning Trust Funds Duke Energy Carolinas, Duke Energy Progress and Duke Energy Florida each maintain NDTFs that are intended to pay for the decommissioning costs of their respective nuclear power plants. The NDTF investments are managed and invested in accordance with applicable requirements of various regulatory bodies including the NRC, FERC, NCUC, PSCSC, FPSC and the IRS. Use of the NDTF investments is restricted to nuclear decommissioning activities including license termination, spent fuel and site restoration. The license termination and spent fuel obligations relate to contaminated decommissioning and are recorded as AROs. The site restoration obligation relates to non-contaminated decommissioning and is recorded to cost of removal within Regulatory liabilities on the Consolidated Balance Sheets. The following table presents the fair value of NDTF assets legally restricted for purposes of settling AROs associated with nuclear decommissioning. Duke Energy Florida entered into an agreement with a third party to decommission Crystal River Unit 3 and was granted an exemption from the NRC, which allows for use of the NDTF for all aspects of nuclear decommissioning. The entire balance of Duke Energy Florida's NDTF may be applied toward license termination, spent fuel and site restoration costs incurred to decommission Crystal River Unit 3 and is excluded from the table below. See Note 16 for additional information related to the fair value of the Duke Energy Registrants' NDTFs. December 31, (in millions) 2021 2020 Duke Energy $ 8,933 $ 7,726 Duke Energy Carolinas 5,068 4,381 Duke Energy Progress 3,865 3,345 Nuclear Operating Licenses As described in Note 3, Duke Energy Carolinas and Duke Energy Progress intend to seek renewal of operating licenses and 20-year license extensions for all of their nuclear stations. The following table includes the current expiration of nuclear operating licenses. Unit Year of Expiration Duke Energy Carolinas Catawba Units 1 and 2 2043 McGuire Unit 1 2041 McGuire Unit 2 2043 Oconee Units 1 and 2 2033 Oconee Unit 3 2034 Duke Energy Progress Brunswick Unit 1 2036 Brunswick Unit 2 2034 Harris 2046 Robinson 2030 The NRC has acknowledged permanent cessation of operation and permanent removal of fuel from the reactor vessel at Crystal River Unit 3. Therefore, the license no longer authorizes operation of the reactor. During 2019, Duke Energy Florida entered into an agreement for the accelerated decommissioning of Crystal River Unit 3. Regulatory approval was received from the NRC and the FPSC in April 2020 and August 2020, respectively. See Note 3 for more information. Closure of Ash Impoundments The Duke Energy Registrants are subject to state and federal regulations covering the closure of coal ash impoundments, including the EPA CCR rule and the Coal Ash Act, and other agreements. AROs recorded on the Duke Energy Registrants' Consolidated Balance Sheets include the legal obligation for closure of coal ash basins and the disposal of related ash as a result of these regulations and agreements. The ARO amount recorded on the Consolidated Balance Sheets is based upon estimated closure costs for impacted ash impoundments. The amount recorded represents the discounted cash flows for estimated closure costs based upon specific closure plans. Actual costs to be incurred will be dependent upon factors that vary from site to site. The most significant factors are the method and time frame of closure at the individual sites. Closure methods considered include removing the water from ash basins, consolidating material as necessary and capping the ash with a synthetic barrier, excavating and relocating the ash to a lined structural fill or lined landfill or recycling the ash for concrete or some other beneficial use. The ultimate method and timetable for closure will be in compliance with standards set by federal and state regulations and other agreements. The ARO amount will be adjusted as additional information is gained through the closure and post-closure process, including acceptance and approval of compliance approaches, which may change management assumptions, and may result in a material change to the balance. See ARO Liability Rollforward section below for information on revisions made to the coal ash liability during 2021 and 2020. Asset retirement costs associated with the AROs for operating plants and retired plants are included in Net property, plant and equipment and Regulatory assets, respectively, on the Consolidated Balance Sheets. See Note 3 for additional information on Regulatory assets related to AROs and Note 4 for additional information on commitments and contingencies. Cost recovery for future expenditures will be pursued through the normal ratemaking process with federal and state utility commissions, which permit recovery of necessary and prudently incurred costs associated with Duke Energy’s regulated operations. See Note 3 for additional information on recovery of coal ash costs. ARO Liability Rollforward The following tables present changes in the liability associated with AROs. Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Balance at December 31, 2019 $ 13,318 $ 5,734 $ 6,471 $ 5,893 $ 578 $ 80 $ 832 $ 17 Accretion expense (a) 542 258 246 225 21 4 33 1 Liabilities settled (b) (724) (198) (451) (358) (93) (2) (74) — Liabilities incurred in the current year 22 — 5 — 5 — — — Revisions in estimates of cash flows (c) (154) (444) (122) (125) 3 29 385 2 Balance at December 31, 2020 13,004 5,350 6,149 5,635 514 111 1,176 20 Accretion expense (a) 512 242 229 212 17 4 35 1 Liabilities settled (b) (613) (210) (324) (214) (110) (3) (77) — Liabilities incurred in the current year 32 8 6 — 6 — — — Revisions in estimates of cash flows (c) (159) (89) 52 42 10 24 (147) 1 Balance at December 31, 2021 $ 12,776 $ 5,301 $ 6,112 $ 5,675 $ 437 $ 136 $ 987 $ 22 (a) Substantially all accretion expense for the years ended December 31, 2021, and 2020, relates to Duke Energy’s regulated operations and has been deferred in accordance with regulatory accounting treatment. (b) Amounts primarily relate to ash impoundment closures and nuclear decommissioning. (c) Primarily relates to decreases due to revised basin closure cost estimates, partially offset by increases related to new closure plan approvals, post closure maintenance and beneficiation costs. Duke Energy Indiana estimates also include the impacts of closure estimates for certain ash impoundments due to the impact of Hoosier Environmental Council’s petition filed with the court challenging the Indiana Department of Environmental Management’s partial approval of Duke Energy Indiana’s ash pond closure plan. See Note 4 for more information on Hoosier Environmental Council's petition. The amounts recorded represent the discounted cash flows for estimated closure costs based upon the probability weightings of the potential closure methods as evaluated on a site-by-site basis.

Property, Plant and Equipment

Property, Plant and Equipment	12 Months Ended
	Dec. 31, 2021
Property, Plant and Equipment [Abstract]
Property, Plant and Equipment	PROPERTY, PLANT AND EQUIPMENT The following tables summarize the property, plant and equipment for Duke Energy and its subsidiary registrants. December 31, 2021 Average Remaining Duke Duke Duke Duke Duke Useful Life Duke Energy Progress Energy Energy Energy Energy (in millions) (Years) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Land $ 2,162 $ 543 $ 957 $ 482 $ 475 $ 219 $ 122 $ 279 Plant – Regulated Electric generation, distribution and transmission 40 120,855 44,910 53,447 32,417 21,030 6,573 15,925 — Natural gas transmission and distribution 54 12,079 — — — — 3,347 — 8,732 Other buildings and improvements 37 1,921 550 514 228 286 381 321 155 Plant – Nonregulated Electric generation, distribution and transmission 28 7,104 — — — — — — — Other buildings and improvements 11 401 — — — — — — — Nuclear fuel 3,181 1,856 1,325 1,325 — — — — Equipment 13 2,659 614 791 497 294 403 262 122 Construction in process 6,168 2,078 2,297 954 1,343 515 460 262 Other 14 5,289 1,323 1,563 1,115 437 287 253 368 Total property, plant and equipment (a)(e) 161,819 51,874 60,894 37,018 23,865 11,725 17,343 9,918 Total accumulated depreciation – regulated (b)(c) (47,611) (17,854) (19,214) (13,387) (5,819) (3,106) (5,583) (1,899) Total accumulated depreciation – nonregulated (d)(e) (2,944) — — — — — — — Facilities to be retired, net 144 102 26 26 — 6 — 11 Total net property, plant and equipment $ 111,408 $ 34,122 $ 41,706 $ 23,657 $ 18,046 $ 8,625 $ 11,760 $ 8,030 (a) Includes finance leases of $958 million, $335 million, $729 million, $627 million, $102 million and $10 million at Duke Energy, Duke Energy Carolinas, Progress Energy, Duke Energy Progress, Duke Energy Florida and Duke Energy Indiana, respectively, primarily within Plant – Regulated. The Progress Energy, Duke Energy Progress and Duke Energy Florida amounts are net of $178 million, $45 million and $133 million, respectively, of accumulated amortization of finance leases. (b) Includes $1,799 million, $1,064 million, $735 million and $735 million of accumulated amortization of nuclear fuel at Duke Energy, Duke Energy Carolinas, Progress Energy and Duke Energy Progress, respectively. (c) Includes accumulated amortization of finance leases of $9 million, $33 million and $3 million at Duke Energy, Duke Energy Carolinas and Duke Energy Indiana, respectively. (d) Includes accumulated amortization of finance leases of ($1 million) at Duke Energy. (e) Includes gross property, plant and equipment cost of consolidated VIEs of $7,339 million and accumulated depreciation of consolidated VIEs of $1,474 million at Duke Energy. Duke Energy continues to execute on its business transformation strategy, including the evaluation of in-office work policies considering the experience with the COVID-19 pandemic and also workforce realignment of roles and responsibilities. In May 2021, Duke Energy management approved the sale of certain properties and entered into an agreement to exit certain leased space on December 31, 2021. The sale of the properties is subject to abandonment accounting and resulted in an impairment charge. Additionally, the exit of the leased space resulted in the impairment of related furniture, fixtures and equipment. During the 12 months ended December 31, 2021, Duke Energy recorded a pretax charge to earnings of $192 million on the Consolidated Statements of Operations, which includes $133 million within Impairment of assets and other charges, $42 million within Operations, maintenance and other and $17 million within Depreciation and amortization. In 2021, Duke Energy continued to monitor recoverability of its renewable merchant plants located in the Electric Reliability Council of Texas West market and in the PJM West market due to fluctuating market pricing and long-term forecasted energy prices. The assets were not impaired as of December 31, 2021, because the carrying value of approximately $200 million continues to approximate the aggregate estimated future undiscounted cash flows. A continued decline in energy market pricing or other factors unfavorably impacting the economics would likely result in a future impairment. Duke Energy retained 51% ownership interest in these facilities following the 2019 transaction to sell a minority interest in certain renewable assets. See Note 1 for further information. December 31, 2020 Average Remaining Duke Duke Duke Duke Duke Useful Life Duke Energy Progress Energy Energy Energy Energy (in millions) (Years) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Land $ 2,046 $ 536 $ 908 $ 463 $ 445 $ 171 $ 118 $ 279 Plant – Regulated Electric generation, distribution and transmission 39 117,107 44,059 50,785 31,375 19,410 6,255 16,008 — Natural gas transmission and distribution 54 10,799 — — — — 3,136 — 7,663 Other buildings and improvements 36 2,038 740 459 197 262 374 300 165 Plant – Nonregulated Electric generation, distribution and transmission 27 5,444 — — — — — — — Other buildings and improvements 10 519 — — — — — — — Nuclear fuel 3,284 1,837 1,447 1,447 — — — — Equipment 15 2,608 620 759 498 261 385 238 122 Construction in process 6,645 1,645 2,013 709 1,304 407 409 581 Other 14 5,090 1,203 1,521 1,070 441 294 309 324 Total property, plant and equipment (a)(e) 155,580 50,640 57,892 35,759 22,123 11,022 17,382 9,134 Total accumulated depreciation – regulated (b)(c) (46,216) (17,453) (18,368) (12,801) (5,560) (3,013) (5,661) (1,749) Total accumulated depreciation – nonregulated (d)(e) (2,611) — — — — — — — Facilities to be retired, net 29 — 29 29 — — — — Total net property, plant and equipment $ 106,782 $ 33,187 $ 39,553 $ 22,987 $ 16,563 $ 8,009 $ 11,721 $ 7,385 (a) Includes finance leases of $832 million, $335 million, $416 million, $297 million, $119 million, and $10 million at Duke Energy, Duke Energy Carolinas, Progress Energy, Duke Energy Progress, Duke Energy Florida and Duke Energy Indiana, respectively, primarily within Plant – Regulated. The Progress Energy, Duke Energy Progress and Duke Energy Florida amounts are net of $141 million, $24 million and $117 million, respectively, of accumulated amortization of finance leases. (b) Includes $1,832 million, $1,010 million, $822 million and $822 million of accumulated amortization of nuclear fuel at Duke Energy, Duke Energy Carolinas, Progress Energy and Duke Energy Progress, respectively. (c) Includes accumulated amortization of finance leases of $12 million, $23 million, and $3 million at Duke Energy, Duke Energy Carolinas and Duke Energy Indiana, respectively. (d) Includes accumulated amortization of finance leases of $23 million at Duke Energy. (e) Includes gross property, plant and equipment cost of consolidated VIEs of $6,394 million and accumulated depreciation of consolidated VIEs of $1,242 million at Duke Energy. The following table presents capitalized interest, which includes the debt component of AFUDC. Years Ended December 31, (in millions) 2021 2020 2019 Duke Energy $ 72 $ 112 $ 159 Duke Energy Carolinas 29 28 30 Progress Energy 20 17 31 Duke Energy Progress 14 12 28 Duke Energy Florida 6 5 3 Duke Energy Ohio 20 26 22 Duke Energy Indiana (a) (17) 10 26 Piedmont 9 8 26 (a) Duke Energy Indiana is primarily compromised of ($24 million) of PISCC amortization, which is partially offset by $7 million of the debt component of AFUDC.

Goodwill and Intangible Assets

Goodwill and Intangible Assets	12 Months Ended
	Dec. 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Intangible Assets	GOODWILL AND INTANGIBLE ASSETS GOODWILL Duke Energy The following table presents goodwill by reportable segment for Duke Energy included on Duke Energy's Consolidated Balance Sheets at December 31, 2021, and 2020. Electric Utilities Gas Utilities Commercial (in millions) and Infrastructure and Infrastructure Renewables Total Goodwill Balance at December 31, 2020 $ 17,379 $ 1,924 $ 122 $ 19,425 Accumulated impairment charges — — (122) (122) Goodwill balance at December 31, 2020, adjusted for accumulated impairment charges $ 17,379 $ 1,924 $ — $ 19,303 Goodwill Balance at December 31, 2021 $ 17,379 $ 1,924 $ 122 $ 19,425 Accumulated impairment charges — — (122) (122) Goodwill balance at December 31, 2021, adjusted for accumulated impairment charges $ 17,379 $ 1,924 $ — $ 19,303 Duke Energy Ohio Duke Energy Ohio's Goodwill balance of $920 million, allocated $596 million to Electric Utilities and Infrastructure and $324 million to Gas Utilities and Infrastructure, is presented net of accumulated impairment charges of $216 million on the Consolidated Balance Sheets at December 31, 2021, and 2020. Progress Energy Progress Energy's Goodwill is included in the Electric Utilities and Infrastructure segment and there are no accumulated impairment charges. Piedmont Piedmont's Goodwill is included in the Gas Utilities and Infrastructure segment and there are no accumulated impairment charges. Goodwill Impairment Testing Duke Energy, Progress Energy, Duke Energy Ohio and Piedmont are required to perform an annual goodwill impairment test as of the same date each year and, accordingly, perform their annual impairment testing of goodwill as of August 31. Duke Energy, Progress Energy, Duke Energy Ohio and Piedmont update their test between annual tests if events or circumstances occur that would more likely than not reduce the fair value of a reporting unit below its carrying value. As the fair value for Duke Energy, Progress Energy, Duke Energy Ohio and Piedmont exceeded their respective carrying values at the date of the annual impairment analysis, no goodwill impairment charges were recorded in 2021. INTANGIBLE ASSETS The following tables show the carrying amount and accumulated amortization of intangible assets included in Other within Other Noncurrent Assets on the Consolidated Balance Sheets of the Duke Energy Registrants at December 31, 2021, and 2020. December 31, 2021 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Emission allowances $ 8 $ — $ 5 $ 2 $ 3 $ — $ 2 $ — Renewable energy certificates 204 73 131 131 — — — — Natural gas, coal and power contracts 24 — — — — — 24 — Renewable operating and development projects 106 — — — — — — — Other 28 — — — — — — — Total gross carrying amounts 370 73 136 133 3 — 26 — Accumulated amortization – natural gas, coal and power contracts (24) — — — — — (24) — Accumulated amortization – renewable operating and development projects (38) — — — — — — — Accumulated amortization – other (4) — — — — — — — Total accumulated amortization (66) — — — — — (24) — Total intangible assets, net $ 304 $ 73 $ 136 $ 133 $ 3 $ — $ 2 $ — December 31, 2020 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Emission allowances $ 8 $ — $ 5 $ 2 $ 3 $ — $ 2 $ — Renewable energy certificates 196 65 130 130 — 1 — — Natural gas, coal and power contracts 24 — — — — — 24 — Renewable operating and development projects 107 — — — — — — — Other 20 — — — — — — — Total gross carrying amounts 355 65 135 132 3 1 26 — Accumulated amortization – natural gas, coal and power contracts (23) — — — — — (23) — Accumulated amortization – renewable operating and development projects (34) — — — — — — — Accumulated amortization – other (3) — — — — — — — Total accumulated amortization (60) — — — — — (23) — Total intangible assets, net $ 295 $ 65 $ 135 $ 132 $ 3 $ 1 $ 3 $ — Amortization Expense Amortization expense amounts for natural gas, coal and power contracts, renewable operating projects and other intangible assets are immaterial for the years ended December 31, 2021, 2020 and 2019, and are expected to be immaterial for the next five years as of December 31, 2021.

Investments in Unconsolidated A

Investments in Unconsolidated Affiliates	12 Months Ended
	Dec. 31, 2021
Equity Method Investments and Joint Ventures [Abstract]
Investments in Unconsolidated Affiliates	INVESTMENTS IN UNCONSOLIDATED AFFILIATES EQUITY METHOD INVESTMENTS Investments in affiliates that are not controlled by Duke Energy, but over which it has significant influence, are accounted for using the equity method. The following table presents Duke Energy’s investments in unconsolidated affiliates accounted for under the equity method, as well as the respective equity in earnings, by segment, for periods presented in this filing. Years Ended December 31, 2021 2020 2019 Equity in Equity in Equity in earnings earnings earnings (in millions) Investments (losses) Investments (losses) (losses) Electric Utilities and Infrastructure $ 104 $ 7 $ 105 $ (1) $ 9 Gas Utilities and Infrastructure 231 8 215 (2,017) 114 Commercial Renewables 513 (34) 534 — (4) Other 122 47 107 13 43 Total $ 970 $ 28 $ 961 $ (2,005) $ 162 During the years ended December 31, 2021, 2020 and 2019, Duke Energy received distributions from equity investments of $80 million, $37 million and $55 million, respectively, which are included in Other assets within Cash Flows from Operating Activities on the Consolidated Statements of Cash Flows. During the years ended December 31, 2021, 2020 and 2019, Duke Energy received distributions from equity investments of $44 million, $133 million and $11 million, respectively, which are included in Return of investment capital within Cash Flows from Investing Activities on the Consolidated Statements of Cash Flows. During the years ended December 31, 2021, 2020 and 2019, Piedmont received distributions from equity investments of $8 million, $2 million and $1 million, respectively, which are included in Other assets within Cash Flows from Operating Activities and $2 million, $2 million and $4 million, respectively, which are included within Cash Flows from Investing Activities on the Consolidated Statements of Cash Flows. Significant investments in affiliates accounted for under the equity method are discussed below. Electric Utilities and Infrastructure Duke Energy owns 50% interests in both DATC and Pioneer, which build, own and operate electric transmission facilities in North America. Gas Utilities and Infrastructure Pipeline Investments Piedmont owns a 21.49% investment in Cardinal, an intrastate pipeline located in North Carolina. Duke Energy owns a 7.5% interest in Sabal Trail, a 517-mile interstate natural gas pipeline, which provides natural gas to Duke Energy Florida and Florida Power and Light. Duke Energy recorded OTTIs of $25 million within Equity in earnings (losses) of unconsolidated affiliates on Duke Energy's Consolidated Statements of Operations for the year ended December 31, 2019, to completely impair its 24% ownership interest in Constitution. Duke Energy owns a 47% interest in the ACP pipeline. In 2020, Duke Energy determined it would no longer continue its investment in the construction of the ACP pipeline. See Notes 3 and 7 for further information. Storage Facilities Piedmont owns a 45% interest in Pine Needle, an interstate LNG storage facility located in North Carolina, and a 50% interest in Hardy Storage, an underground interstate natural gas storage facility located in West Virginia. Renewable Natural Gas Investments Duke Energy owns a 29.68% investment in SustainRNG, a developer of renewable natural gas projects, and a 70% interest in Sustain T&W, SustainRNG's renewable natural gas project located in Georgia. Commercial Renewables DS Cornerstone, LLC, which owns wind farm projects in the U.S. was part of a sale of minority interest in a certain portion of renewable assets in 2019. See Note 1 for more information on the sale. Prior to the sale, Duke Energy had a 50% interest in DS Cornerstone, LLC. Subsequent to the sale, Duke Energy has a 26% interest in the investment. In 2020, Duke Energy completed its acquisition of 70 distributed fuel cell projects from Bloom Energy Corporation, which approximates 43 MW of capacity serving commercial and industrial customers across the U.S. Duke Energy is not the primary beneficiary of the distributed fuel cell portfolio and does not consolidate these assets. Other Duke Energy has a 17.5% indirect economic ownership interest and a 25% board representation and voting rights interest in NMC, which owns and operates a methanol and MTBE business in Jubail, Saudi Arabia. Significant Subsidiaries For the year ended December 31, 2020, Duke Energy's investment in ACP met the requirements of S-X Rule 4-08(g) to provide summarized financial information. The following table provides summary information for ACP as required under S-X Rule 1-02(bb) for the period of significance and comparative prior year periods in Duke Energy's consolidated balance sheets and consolidated statements of operations. For the year ended December 31, 2021, there were no investments that met the significance requirements. (in millions) December 31, 2020 Current assets $ 43 Noncurrent assets 93 Current liabilities 1,965 Noncurrent liabilities 167 Membership interests (1,996) Years Ended December 31, 2020 2019 Net revenues $ — $ — Operating loss (4,612) (5) Net (loss) income (4,512) 246 Net (loss) income attributable to Duke Energy $ (2,121) $ 116

Related Party Transactions

Related Party Transactions	12 Months Ended
	Dec. 31, 2021
Related Party Transactions [Abstract]
Related Party Transactions	RELATED PARTY TRANSACTIONS The Subsidiary Registrants engage in related party transactions in accordance with the applicable state and federal commission regulations. Refer to the Consolidated Balance Sheets of the Subsidiary Registrants for balances due to or due from related parties. Material amounts related to transactions with related parties included in the Consolidated Statements of Operations and Comprehensive Income are presented in the following table. Years Ended December 31, (in millions) 2021 2020 2019 Duke Energy Carolinas Corporate governance and shared service expenses (a) $ 894 $ 753 $ 841 Indemnification coverages (b) 24 20 20 Joint Dispatch Agreement (JDA) revenue (c) 41 25 60 JDA expense (c) 207 114 186 Intercompany natural gas purchases (d) 11 15 15 Progress Energy Corporate governance and shared service expenses (a) $ 856 $ 715 $ 778 Indemnification coverages (b) 41 36 37 JDA revenue (c) 207 114 186 JDA expense (c) 41 25 60 Intercompany natural gas purchases (d) 75 75 76 Duke Energy Progress Corporate governance and shared service expenses (a) $ 504 $ 420 $ 462 Indemnification coverages (b) 19 17 15 JDA revenue (c) 207 114 186 JDA expense (c) 41 25 60 Intercompany natural gas purchases (d) 75 75 76 Duke Energy Florida Corporate governance and shared service expenses (a) $ 352 $ 295 $ 316 Indemnification coverages (b) 22 19 22 Duke Energy Ohio Corporate governance and shared service expenses (a) $ 329 $ 326 $ 354 Indemnification coverages (b) 4 4 4 Duke Energy Indiana Corporate governance and shared service expenses (a) $ 409 $ 401 $ 412 Indemnification coverages (b) 8 8 7 Piedmont Corporate governance and shared service expenses (a) $ 139 $ 140 $ 138 Indemnification coverages (b) 3 3 3 Intercompany natural gas sales (d) 86 90 91 Natural gas storage and transportation costs (e) 22 23 23 (a) The Subsidiary Registrants are charged their proportionate share of corporate governance and other shared services costs, primarily related to human resources, employee benefits, information technology, legal and accounting fees, as well as other third-party costs. These amounts are primarily recorded in Operation, maintenance and other on the Consolidated Statements of Operations and Comprehensive Income. (b) The Subsidiary Registrants incur expenses related to certain indemnification coverages through Bison, Duke Energy’s wholly owned captive insurance subsidiary. These expenses are recorded in Operation, maintenance and other on the Consolidated Statements of Operations and Comprehensive Income. (c) Duke Energy Carolinas and Duke Energy Progress participate in a JDA, which allows the collective dispatch of power plants between the service territories to reduce customer rates. Revenues from the sale of power and expenses from the purchase of power pursuant to the JDA are recorded in Operating Revenues and Fuel used in electric generation and purchased power, respectively, on the Consolidated Statements of Operations and Comprehensive Income. (d) Piedmont provides long-term natural gas delivery service to certain Duke Energy Carolinas and Duke Energy Progress natural gas-fired generation facilities. Piedmont records the sales in Operating Revenues, and Duke Energy Carolinas and Duke Energy Progress record the related purchases as a component of Fuel used in electric generation and purchased power on their respective Consolidated Statements of Operations and Comprehensive Income. These intercompany revenues and expenses are eliminated in consolidation. (e) Piedmont has related party transactions as a customer of its equity method investments in Pine Needle, Hardy Storage, and Cardinal natural gas storage and transportation facilities. These expenses are included in Cost of natural gas on Piedmont's Consolidated Statements of Operations and Comprehensive Income. In addition to the amounts presented above, the Subsidiary Registrants have other affiliate transactions, including rental of office space, participation in a money pool arrangement, other operational transactions and their proportionate share of certain charged expenses. See Note 6 for more information regarding money pool. These transactions of the Subsidiary Registrants are incurred in the ordinary course of business and are eliminated in consolidation. As discussed in Note 17, certain trade receivables have been sold by Duke Energy Ohio and Duke Energy Indiana to CRC, an affiliate formed by a subsidiary of Duke Energy. The proceeds obtained from the sales of receivables are largely cash but do include a subordinated note from CRC for a portion of the purchase price. Intercompany Income Taxes Duke Energy and the Subsidiary Registrants file a consolidated federal income tax return and other state and jurisdictional returns. The Subsidiary Registrants have a tax sharing agreement with Duke Energy for the allocation of consolidated tax liabilities and benefits. Income taxes recorded represent amounts the Subsidiary Registrants would incur as separate C-Corporations. The following table includes the balance of intercompany income tax receivables and payables for the Subsidiary Registrants. Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Carolinas Energy Progress Florida Ohio Indiana Piedmont December 31, 2021 Intercompany income tax receivable $ — $ — $ — $ 40 $ 19 $ — $ — Intercompany income tax payable 62 — 84 — — 10 27 December 31, 2020 Intercompany income tax receivable $ — $ — $ — $ — $ — $ 9 $ 10 Intercompany income tax payable 31 33 46 35 2 — —

Derivatives and Hedging

Derivatives and Hedging	12 Months Ended
	Dec. 31, 2021
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivatives and Hedging	DERIVATIVES AND HEDGING The Duke Energy Registrants use commodity and interest rate contracts to manage commodity price risk and interest rate risk. The primary use of commodity derivatives is to hedge the generation portfolio against changes in the prices of electricity and natural gas. Piedmont enters into natural gas supply contracts to provide diversification, reliability and natural gas cost benefits to its customers. Interest rate derivatives are used to manage interest rate risk associated with borrowings. All derivative instruments not identified as NPNS are recorded at fair value as assets or liabilities on the Consolidated Balance Sheets. Cash collateral related to derivative instruments executed under master netting arrangements is offset against the collateralized derivatives on the Consolidated Balance Sheets. The cash impacts of settled derivatives are recorded as operating activities on the Consolidated Statements of Cash Flows. INTEREST RATE RISK The Duke Energy Registrants are exposed to changes in interest rates as a result of their issuance or anticipated issuance of variable-rate and fixed-rate debt and commercial paper. Interest rate risk is managed by limiting variable-rate exposures to a percentage of total debt and by monitoring changes in interest rates. To manage risk associated with changes in interest rates, the Duke Energy Registrants may enter into interest rate swaps, U.S. Treasury lock agreements and other financial contracts. In anticipation of certain fixed-rate debt issuances, a series of forward-starting interest rate swaps or Treasury locks may be executed to lock in components of current market interest rates. These instruments are later terminated prior to or upon the issuance of the corresponding debt. Cash Flow Hedges For a derivative designated as hedging the exposure to variable cash flows of a future transaction, referred to as a cash flow hedge, the effective portion of the derivative's gain or loss is initially reported as a component of other comprehensive income and subsequently reclassified into earnings once the future transaction impacts earnings. Amounts for interest rate contracts are reclassified to earnings as interest expense over the term of the related debt. Gains and losses reclassified out of AOCI for the years ended December 31, 2021, 2020 and 2019, were not material. Duke Energy's interest rate derivatives designated as hedges include interest rate swaps used to hedge existing debt within the Commercial Renewables segment and forward-starting interest rate swaps not accounted for under regulatory accounting. Undesignated Contracts Undesignated contracts primarily include contracts not designated as a hedge because they are accounted for under regulatory accounting or contracts that do not qualify for hedge accounting. Duke Energy’s interest rate swaps for its regulated operations employ regulatory accounting. With regulatory accounting, the mark-to-market gains or losses on the swaps are deferred as regulatory liabilities or regulatory assets, respectively. Regulatory assets and liabilities are amortized consistent with the treatment of the related costs in the ratemaking process. The accrual of interest on the swaps is recorded as Interest Expense on the Duke Energy Registrant's Consolidated Statements of Operations and Comprehensive Income. The following tables show notional amounts of outstanding derivatives related to interest rate risk. December 31, 2021 Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy (in millions) Energy Carolinas Energy Progress Indiana Ohio Cash flow hedges $ 2,415 $ — $ — $ — $ — $ — Undesignated contracts 1,177 350 500 500 300 27 Total notional amount (a) $ 3,592 $ 350 $ 500 $ 500 $ 300 $ 27 December 31, 2020 Duke Duke Duke Duke Energy Progress Energy Energy (in millions) Energy Carolinas Energy Progress Ohio Cash flow hedges $ 632 $ — $ — $ — $ — Undesignated contracts 1,177 400 750 750 27 Total notional amount (a) $ 1,809 $ 400 $ 750 $ 750 $ 27 (a) Duke Energy includes amounts related to consolidated VIEs of $665 million in cash flow hedges as of December 31, 2021, and $632 million in cash flow hedges as of December 31, 2020. COMMODITY PRICE RISK The Duke Energy Registrants are exposed to the impact of changes in the prices of electricity purchased and sold in bulk power markets and natural gas purchases, including Piedmont's natural gas supply contracts. Exposure to commodity price risk is influenced by a number of factors including the term of contracts, the liquidity of markets and delivery locations. To manage risk associated with commodity prices, the Duke Energy Registrants may enter into long-term power purchase or sales contracts and long-term natural gas supply agreements. Cash Flow Hedges For derivatives designated as hedging the exposure to variable cash flows of a future transaction, referred to as a cash flow hedge, the derivative's gain or loss is initially reported as a component of other comprehensive income and subsequently reclassified into earnings once the future transaction impacts earnings. Gains and losses reclassified out of accumulated other comprehensive income (loss) for the year ended December 31, 2021 , 2020 and 2019, w ere not material. Duke Energy’s commodity derivatives designated as hedges include long-term electricity sales in the Commercial Renewables segment. Undesignated Contracts For the Subsidiary Registrants, bulk power electricity and natural gas purchases flow through fuel adjustment clauses, formula-based contracts or other cost sharing mechanisms. Differences between the costs included in rates and the incurred costs, including undesignated derivative contracts, are largely deferred as regulatory assets or regulatory liabilities. Piedmont policies allow for the use of financial instruments to hedge commodity price risks. The strategy and objective of these hedging programs are to use the financial instruments to reduce natural gas cost volatility for customers. Volumes The tables below include volumes of outstanding commodity derivatives. Amounts disclosed represent the absolute value of notional volumes of commodity contracts excluding NPNS. The Duke Energy Registrants have netted contractual amounts where offsetting purchase and sale contracts exist with identical delivery locations and times of delivery. Where all commodity positions are perfectly offset, no quantities are shown. December 31, 2021 Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy Carolinas Energy Progress Ohio Indiana Piedmont Electricity (GWh) (a) 22,344 — — — 1,681 10,688 — Natural gas (millions of Dth) 823 264 215 215 — 8 336 December 31, 2020 Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy Carolinas Energy Progress Ohio Indiana Piedmont Electricity (GWh) (a) 35,409 — — — 2,559 10,802 — Natural gas (millions of Dth) 678 145 158 158 — 2 373 (a) Duke Energy includes 9,975 GWh and 22,048 GWh related to cash flow hedges as of December 31, 2021, and 2020, respectively. LOCATION AND FAIR VALUE OF DERIVATIVE ASSETS AND LIABILITIES RECOGNIZED IN THE CONSOLIDATED BALANCE SHEETS The following tables show the fair value and balance sheet location of derivative instruments. Although derivatives subject to master netting arrangements are netted on the Consolidated Balance Sheets, the fair values presented below are shown gross and cash collateral on the derivatives has not been netted against the fair values shown. Derivative Assets December 31, 2021 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Commodity Contracts Not Designated as Hedging Instruments Current $ 199 $ 99 $ 72 $ 72 $ — $ 2 $ 23 $ 3 Noncurrent 113 63 50 50 — — — — Total Derivative Assets – Commodity Contracts $ 312 $ 162 $ 122 $ 122 $ — $ 2 $ 23 $ 3 Interest Rate Contracts Designated as Hedging Instruments Current $ 3 $ — $ — $ — $ — $ — $ — $ — Noncurrent 3 — — — — — — — Not Designated as Hedging Instruments Current $ 2 $ — $ 2 $ 2 $ — $ — $ — $ — Total Derivative Assets – Interest Rate Contracts $ 8 $ — $ 2 $ 2 $ — $ — $ — $ — Total Derivative Assets $ 320 $ 162 $ 124 $ 124 $ — $ 2 $ 23 $ 3 Derivative Liabilities December 31, 2021 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Commodity Contracts Designated as Hedging Instruments Current $ 27 $ — $ — $ — $ — $ — $ — $ — Noncurrent 117 — — — — — — — Not Designated as Hedging Instruments Current $ 72 $ 18 $ 19 $ 5 $ 14 $ — $ 13 $ 21 Noncurrent 132 9 5 5 — — — 118 Total Derivative Liabilities – Commodity Contracts $ 348 $ 27 $ 24 $ 10 $ 14 $ — $ 13 $ 139 Interest Rate Contracts Designated as Hedging Instruments Current $ 75 $ — $ — $ — $ — $ — $ — $ — Noncurrent 21 — — — — — — — Not Designated as Hedging Instruments Current 10 8 — — — 1 — — Noncurrent 18 — — — — 4 14 — Total Derivative Liabilities – Interest Rate Contracts $ 124 $ 8 $ — $ — $ — $ 5 $ 14 $ — Total Derivative Liabilities $ 472 $ 35 $ 24 $ 10 $ 14 $ 5 $ 27 $ 139 Derivative Assets December 31, 2020 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Commodity Contracts Not Designated as Hedging Instruments Current $ 30 $ 14 $ 9 $ 9 $ — $ 1 $ 6 $ 1 Noncurrent 13 6 6 6 — — — — Total Derivative Assets – Commodity Contracts $ 43 $ 20 $ 15 $ 15 $ — $ 1 $ 6 $ 1 Interest Rate Contracts Not Designated as Hedging Instruments Current $ 18 $ — $ 18 $ 18 $ — $ — $ — $ — Total Derivative Assets – Interest Rate Contracts $ 18 $ — $ 18 $ 18 $ — $ — $ — $ — Total Derivative Assets $ 61 $ 20 $ 33 $ 33 $ — $ 1 $ 6 $ 1 Derivative Liabilities December 31, 2020 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Commodity Contracts Designated as Hedging Instruments Current $ 14 $ — $ — $ — $ — $ — $ — $ — Noncurrent 70 — — — — — — — Not Designated as Hedging Instruments Current $ 30 $ 13 $ 2 $ 2 $ — $ — $ 1 $ 15 Noncurrent 137 3 27 12 — — — 107 Total Derivative Liabilities – Commodity Contracts $ 251 $ 16 $ 29 $ 14 $ — $ — $ 1 $ 122 Interest Rate Contracts Designated as Hedging Instruments Current $ 15 $ — $ — $ — $ — $ — $ — $ — Noncurrent 48 — — — — — — — Not Designated as Hedging Instruments Current 5 4 — — — 1 — — Noncurrent 5 — — — — 5 — — Total Derivative Liabilities – Interest Rate Contracts $ 73 $ 4 $ — $ — $ — $ 6 $ — $ — Total Derivative Liabilities $ 324 $ 20 $ 29 $ 14 $ — $ 6 $ 1 $ 122 OFFSETTING ASSETS AND LIABILITIES The following tables present the line items on the Consolidated Balance Sheets where derivatives are reported. Substantially all of Duke Energy's outstanding derivative contracts are subject to enforceable master netting arrangements. The gross amounts offset in the tables below show the effect of these netting arrangements on financial position and include collateral posted to offset the net position. The amounts shown are calculated by counterparty. Accounts receivable or accounts payable may also be available to offset exposures in the event of bankruptcy. These amounts are not included in the tables below. Derivative Assets December 31, 2021 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Current Gross amounts recognized $ 204 $ 99 $ 74 $ 74 $ — $ 2 $ 23 $ 3 Gross amounts offset (25) (16) (9) (9) — — — — Net amounts presented in Current Assets: Other $ 179 $ 83 $ 65 $ 65 $ — $ 2 $ 23 $ 3 Noncurrent Gross amounts recognized $ 116 $ 63 $ 50 $ 50 $ — $ — $ — $ — Gross amounts offset (23) (15) (8) (8) — — — — Net amounts presented in Other Noncurrent Assets: Other $ 93 $ 48 $ 42 $ 42 $ — $ — $ — $ — Derivative Liabilities December 31, 2021 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Current Gross amounts recognized $ 184 $ 26 $ 19 $ 5 $ 14 $ 1 $ 13 $ 21 Gross amounts offset (11) (6) (5) (5) — — — — Net amounts presented in Current Liabilities: Other $ 173 $ 20 $ 14 $ — $ 14 $ 1 $ 13 $ 21 Noncurrent Gross amounts recognized $ 288 $ 9 $ 5 $ 5 $ — $ 4 $ 14 $ 118 Gross amounts offset (12) (8) (5) (5) — — — — Net amounts presented in Other Noncurrent Liabilities: Other $ 276 $ 1 $ — $ — $ — $ 4 $ 14 $ 118 Derivative Assets December 31, 2020 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Current Gross amounts recognized $ 48 $ 14 $ 27 $ 27 $ — $ 1 $ 6 $ 1 Gross amounts offset (3) (2) (2) (2) — — — — Net amounts presented in Current Assets: Other $ 45 $ 12 $ 25 $ 25 $ — $ 1 $ 6 $ 1 Noncurrent Gross amounts recognized $ 13 $ 6 $ 6 $ 6 $ — $ — $ — $ — Gross amounts offset (5) (1) (4) (4) — — — — Net amounts presented in Other Noncurrent Assets: Other $ 8 $ 5 $ 2 $ 2 $ — $ — $ — $ — Derivative Liabilities December 31, 2020 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Current Gross amounts recognized $ 64 $ 17 $ 2 $ 2 $ — $ 1 $ 1 $ 15 Gross amounts offset (3) (2) (2) (2) — — — — Net amounts presented in Current Liabilities: Other $ 61 $ 15 $ — $ — $ — $ 1 $ 1 $ 15 Noncurrent Gross amounts recognized $ 260 $ 3 $ 27 $ 12 $ — $ 5 $ — $ 107 Gross amounts offset (5) (1) (4) (4) — — — — Net amounts presented in Other Noncurrent Liabilities: Other $ 255 $ 2 $ 23 $ 8 $ — $ 5 $ — $ 107

Investments in Debt and Equity

Investments in Debt and Equity Securities	12 Months Ended
	Dec. 31, 2021
Investments, Debt and Equity Securities [Abstract]
Investments in Debt and Equity Securities	INVESTMENTS IN DEBT AND EQUITY SECURITIES Duke Energy’s investments in debt and equity securities are primarily comprised of investments held in (i) the NDTF at Duke Energy Carolinas, Duke Energy Progress and Duke Energy Florida, (ii) the grantor trusts at Duke Energy Progress, Duke Energy Florida and Duke Energy Indiana related to OPEB plans and (iii) Bison. The Duke Energy Registrants classify investments in debt securities as AFS and investments in equity securities as FV-NI. For investments in debt securities classified as AFS, the unrealized gains and losses are included in other comprehensive income until realized, at which time they are reported through net income. For investments in equity securities classified as FV-NI, both realized and unrealized gains and losses are reported through net income. Substantially all of Duke Energy’s investments in debt and equity securities qualify for regulatory accounting, and accordingly, all associated realized and unrealized gains and losses on these investments are deferred as a regulatory asset or liability. Duke Energy classifies the majority of investments in debt and equity securities as long term, unless otherwise noted. Investment Trusts The investments within the Investment Trusts are managed by independent investment managers with discretion to buy, sell and invest pursuant to the objectives set forth by the investment manager agreements and trust agreements. The Duke Energy Registrants have limited oversight of the day-to-day management of these investments. As a result, the ability to hold investments in unrealized loss positions is outside the control of the Duke Energy Registrants. Accordingly, all unrealized losses associated with debt securities within the Investment Trusts are recognized immediately and deferred to regulatory accounts where appropriate. Other AFS Securities Unrealized gains and losses on all other AFS securities are included in other comprehensive income until realized, unless it is determined the carrying value of an investment has a credit loss. The Duke Energy Registrants analyze all investment holdings each reporting period to determine whether a decline in fair value is related to a credit loss. If a credit loss exists, the unrealized credit loss is included in earnings. There were no material credit losses as of December 31, 2021, and 2020. Other Investments amounts are recorded in Other within Other Noncurrent Assets on the Consolidated Balance Sheets. DUKE ENERGY The following table presents the estimated fair value of investments in debt and equity securities; equity investments are classified as FV-NI and debt investments are classified as AFS. December 31, 2021 December 31, 2020 Gross Gross Gross Gross Unrealized Unrealized Unrealized Unrealized Holding Holding Estimated Holding Holding Estimated (in millions) Gains Losses Fair Value Gains Losses Fair Value NDTF Cash and cash equivalents $ — $ — $ 160 $ — $ — $ 177 Equity securities 4,905 43 7,350 4,138 54 6,235 Corporate debt securities 39 6 829 76 1 806 Municipal bonds 14 1 314 22 — 370 U.S. government bonds 31 12 1,568 51 — 1,361 Other debt securities 3 1 180 8 — 180 Total NDTF Investments $ 4,992 $ 63 $ 10,401 $ 4,295 $ 55 $ 9,129 Other Investments Cash and cash equivalents $ — $ — $ 36 $ — $ — $ 127 Equity securities 36 — 156 79 — 146 Corporate debt securities 2 1 119 8 — 110 Municipal bonds 3 1 80 5 — 86 U.S. government bonds — — 56 — — 42 Other debt securities — 1 45 — — 47 Total Other Investments $ 41 $ 3 $ 492 $ 92 $ — $ 558 Total Investments $ 5,033 $ 66 $ 10,893 $ 4,387 $ 55 $ 9,687 Realized gains and losses, which were determined on a specific identification basis, from sales of FV-NI and AFS securities for the years ended December 31, 2021, 2020 and 2019, were as follows. Years Ended December 31, (in millions) 2021 2020 2019 FV-NI: Realized gains $ 724 $ 366 $ 172 Realized losses 141 174 151 AFS: Realized gains 56 96 94 Realized losses 54 51 67 DUKE ENERGY CAROLINAS The following table presents the estimated fair value of investments in debt and equity securities; equity investments are classified as FV-NI and debt investments are classified as AFS. December 31, 2021 December 31, 2020 Gross Gross Gross Gross Unrealized Unrealized Unrealized Unrealized Holding Holding Estimated Holding Holding Estimated (in millions) Gains Losses Fair Value Gains Losses Fair Value NDTF Cash and cash equivalents $ — $ — $ 53 $ — $ — $ 30 Equity securities 2,887 19 4,265 2,442 23 3,685 Corporate debt securities 24 4 506 49 1 510 Municipal bonds 2 — 48 6 — 91 U.S. government bonds 16 3 712 25 — 475 Other debt securities 3 1 175 7 — 174 Total NDTF Investments $ 2,932 $ 27 $ 5,759 $ 2,529 $ 24 $ 4,965 Realized gains and losses, which were determined on a specific identification basis, from sales of FV-NI and AFS securities for the years ended December 31, 2021, 2020 and 2019, were as follows. Years Ended December 31, (in millions) 2021 2020 2019 FV-NI: Realized gains $ 440 $ 64 $ 113 Realized losses 96 99 107 AFS: Realized gains 38 60 55 Realized losses 37 37 38 PROGRESS ENERGY The following table presents the estimated fair value of investments in debt and equity securities; equity investments are classified as FV-NI and debt investments are classified as AFS. December 31, 2021 December 31, 2020 Gross Gross Gross Gross Unrealized Unrealized Unrealized Unrealized Holding Holding Estimated Holding Holding Estimated (in millions) Gains Losses Fair Value Gains Losses Fair Value NDTF Cash and cash equivalents $ — $ — $ 107 $ — $ — $ 147 Equity securities 2,018 24 3,085 1,696 31 2,550 Corporate debt securities 15 2 323 27 — 296 Municipal bonds 12 1 266 16 — 279 U.S. government bonds 15 9 856 26 — 886 Other debt securities — — 5 1 — 6 Total NDTF Investments $ 2,060 $ 36 $ 4,642 $ 1,766 $ 31 $ 4,164 Other Investments Cash and cash equivalents $ — $ — $ 20 $ — $ — $ 106 Municipal bonds 2 — 26 3 — 26 Total Other Investments $ 2 $ — $ 46 $ 3 $ — $ 132 Total Investments $ 2,062 $ 36 $ 4,688 $ 1,769 $ 31 $ 4,296 Realized gains and losses, which were determined on a specific identification basis, from sales of FV-NI and AFS securities for the years ended December 31, 2021, 2020 and 2019, were as follows. Years Ended December 31, (in millions) 2021 2020 2019 FV-NI: Realized gains $ 284 $ 302 $ 59 Realized losses 45 75 44 AFS: Realized gains 16 24 36 Realized losses 14 13 29 DUKE ENERGY PROGRESS The following table presents the estimated fair value of investments in debt and equity securities; equity investments are classified as FV-NI and debt investments are classified as AFS. December 31, 2021 December 31, 2020 Gross Gross Gross Gross Unrealized Unrealized Unrealized Unrealized Holding Holding Estimated Holding Holding Estimated (in millions) Gains Losses Fair Value Gains Losses Fair Value NDTF Cash and cash equivalents $ — $ — $ 94 $ — $ — $ 76 Equity securities 1,915 23 2,970 1,617 31 2,459 Corporate debt securities 15 2 282 27 — 296 Municipal bonds 12 1 266 16 — 279 U.S. government bonds 15 3 472 26 — 412 Other debt securities — — 5 1 — 6 Total NDTF Investments $ 1,957 $ 29 $ 4,089 $ 1,687 $ 31 $ 3,528 Other Investments Cash and cash equivalents $ — $ — $ 16 $ — $ — $ 1 Total Other Investments $ — $ — $ 16 $ — $ — $ 1 Total Investments $ 1,957 $ 29 $ 4,105 $ 1,687 $ 31 $ 3,529 Realized gains and losses, which were determined on a specific identification basis, from sales of FV-NI and AFS securities for the years ended December 31, 2021, 2020 and 2019, were as follows. Years Ended December 31, (in millions) 2021 2020 2019 FV-NI: Realized gains $ 283 $ 52 $ 38 Realized losses 44 59 33 AFS: Realized gains 15 24 7 Realized losses 13 13 5 DUKE ENERGY FLORIDA The following table presents the estimated fair value of investments in debt and equity securities; equity investments are classified as FV-NI and debt investments are classified as AFS. December 31, 2021 December 31, 2020 Gross Gross Gross Gross Unrealized Unrealized Unrealized Unrealized Holding Holding Estimated Holding Holding Estimated (in millions) Gains Losses Fair Value Gains Losses Fair Value NDTF Cash and cash equivalents $ — $ — $ 13 $ — $ — $ 71 Equity securities 103 1 115 79 — 91 Corporate debt securities — — 41 — — — U.S. government bonds — 6 384 — — 474 Total NDTF Investments (a) $ 103 $ 7 $ 553 $ 79 $ — $ 636 Other Investments Cash and cash equivalents $ — $ — $ 3 $ — $ — $ 1 Municipal bonds 2 — 26 3 — 26 Total Other Investments $ 2 $ — $ 29 $ 3 $ — $ 27 Total Investments $ 105 $ 7 $ 582 $ 82 $ — $ 663 (a) During the years ended December 31, 2021, and 2020, Duke Energy Florida continued to receive reimbursements from the NDTF for costs related to ongoing decommissioning activity of the Crystal River Unit 3. Realized gains and losses, which were determined on a specific identification basis, from sales of FV-NI and AFS securities for the years ended December 31, 2021, 2020 and 2019, were as follows. Years Ended December 31, (in millions) 2021 2020 2019 FV-NI: Realized gains $ 1 $ 250 $ 21 Realized losses 1 16 11 AFS: Realized gains 1 — 29 Realized losses 1 — 24 DUKE ENERGY INDIANA The following table presents the estimated fair value of investments in debt and equity securities; equity investments are measured at FV-NI and debt investments are classified as AFS. December 31, 2021 December 31, 2020 Gross Gross Gross Gross Unrealized Unrealized Unrealized Unrealized Holding Holding Estimated Holding Holding Estimated (in millions) Gains Losses Fair Value Gains Losses Fair Value Investments Cash and cash equivalents $ — $ — $ — $ — $ — $ 1 Equity securities 6 — 97 58 — 97 Corporate debt securities — — 6 — — 3 Municipal bonds 1 1 46 1 — 38 U.S. government bonds — — 12 — — 4 Total Investments $ 7 $ 1 $ 161 $ 59 $ — $ 143 Realized gains and losses, which were determined on a specific identification basis, from sales of FV-NI and AFS securities for the years ended December 31, 2021, 2020 and 2019, were immaterial. DEBT SECURITY MATURITIES The table below summarizes the maturity date for debt securities. December 31, 2021 Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Indiana Due in one year or less $ 159 $ 3 $ 138 $ 31 $ 107 $ 7 Due after one through five years 957 337 546 256 290 25 Due after five through 10 years 550 226 248 231 17 10 Due after 10 years 1,525 875 544 507 37 22 Total $ 3,191 $ 1,441 $ 1,476 $ 1,025 $ 451 $ 64

Fair Value Measurements

Fair Value Measurements	12 Months Ended
	Dec. 31, 2021
Fair Value Disclosures [Abstract]
Fair Value Measurements	FAIR VALUE MEASUREMENTS Fair value is the exchange price to sell an asset or transfer a liability in an orderly transaction between market participants at the measurement date. The fair value definition focuses on an exit price versus the acquisition cost. Fair value measurements use market data or assumptions market participants would use in pricing the asset or liability, including assumptions about risk and the risks inherent in the inputs to the valuation technique. These inputs may be readily observable, corroborated by market data, or generally unobservable. Valuation techniques maximize the use of observable inputs and minimize the use of unobservable inputs. A midmarket pricing convention (the midpoint price between bid and ask prices) is permitted for use as a practical expedient. Fair value measurements are classified in three levels based on the fair value hierarchy as defined by GAAP. Certain investments are not categorized within the fair value hierarchy. These investments are measured at fair value using the net asset value per share practical expedient. The net asset value is derived based on the investment cost, less any impairment, plus or minus changes resulting from observable price changes for an identical or similar investment of the same issuer. Fair value accounting guidance permits entities to elect to measure certain financial instruments that are not required to be accounted for at fair value, such as equity method investments or the company’s own debt, at fair value. The Duke Energy Registrants have not elected to record any of these items at fair value. Valuation methods of the primary fair value measurements disclosed below are as follows. Investments in equity securities The majority of investments in equity securities are valued using Level 1 measurements. Investments in equity securities are typically valued at the closing price in the principal active market as of the last business day of the quarter. Principal active markets for equity prices include published exchanges such as the NYSE and Nasdaq Stock Market. Foreign equity prices are translated from their trading currency using the currency exchange rate in effect at the close of the principal active market. There was no after-hours market activity that was required to be reflected in the reported fair value measurements. Investments in debt securities Most investments in debt securities are valued using Level 2 measurements because the valuations use interest rate curves and credit spreads applied to the terms of the debt instrument (maturity and coupon interest rate) and consider the counterparty credit rating. If the market for a particular fixed-income security is relatively inactive or illiquid, the measurement is Level 3. Commodity derivatives Commodity derivatives with clearinghouses are classified as Level 1. Commodity derivatives with observable forward curves are classified as Level 2. If forward price curves are not observable for the full term of the contract and the unobservable period had more than an insignificant impact on the valuation, the commodity derivative is classified as Level 3. In isolation, increases (decreases) in natural gas forward prices result in favorable (unfavorable) fair value adjustments for natural gas purchase contracts; and increases (decreases) in electricity forward prices result in unfavorable (favorable) fair value adjustments for electricity sales contracts. Duke Energy regularly evaluates and validates pricing inputs used to estimate the fair value of natural gas commodity contracts by a market participant price verification procedure. This procedure provides a comparison of internal forward commodity curves to market participant generated curves. Interest rate derivatives Most over-the-counter interest rate contract derivatives are valued using financial models that utilize observable inputs for similar instruments and are classified as Level 2. Inputs include forward interest rate curves, notional amounts, interest rates and credit quality of the counterparties. Other fair value considerations See Note 11 for a discussion of the valuation of goodwill and intangible assets. DUKE ENERGY The following tables provide recorded balances for assets and liabilities measured at fair value on a recurring basis on the Consolidated Balance Sheets. Derivative amounts in the tables below for all Duke Energy Registrants exclude cash collateral, which is disclosed in Note 14. See Note 15 for additional information related to investments by major security type for the Duke Energy Registrants. December 31, 2021 (in millions) Total Fair Value Level 1 Level 2 Level 3 Not Categorized NDTF cash and cash equivalents $ 160 $ 160 $ — $ — $ — NDTF equity securities 7,350 7,300 — — 50 NDTF debt securities 2,891 967 1,924 — — Other equity securities 156 156 — — — Other debt securities 300 45 255 — — Other cash and cash equivalents 36 36 — — — Derivative assets 320 3 293 24 — Total assets 11,213 8,667 2,472 24 50 Derivative liabilities (472) (13) (314) (145) — Net assets (liabilities) $ 10,741 $ 8,654 $ 2,158 $ (121) $ 50 December 31, 2020 (in millions) Total Fair Value Level 1 Level 2 Level 3 Not Categorized NDTF cash and cash equivalents $ 177 $ 177 $ — $ — $ — NDTF equity securities 6,235 6,189 — — 46 NDTF debt securities 2,717 874 1,843 — — Other equity securities 146 146 — — — Other debt securities 285 37 248 — — Other cash and cash equivalents 127 127 — — — Derivative assets 61 1 53 7 — Total assets 9,748 7,551 2,144 7 46 Derivative liabilities (324) — (240) (84) — Net assets (liabilities) $ 9,424 $ 7,551 $ 1,904 $ (77) $ 46 The following table provides reconciliations of beginning and ending balances of assets and liabilities measured at fair value using Level 3 measurements. Derivatives (net) Years Ended December 31, (in millions) 2021 2020 Balance at beginning of period $ (77) $ (102) Total pretax realized or unrealized losses included in comprehensive income (75) (84) Purchases, sales, issuances and settlements: Purchases 21 14 Settlements (5) (19) Net transfers Out of Level 3 (a) — 117 Total gains (losses) included on the Consolidated Balance Sheet 15 (3) Balance at end of period $ (121) $ (77) (a) Transferred from Level 3 to Level 2 because observable market data became available. DUKE ENERGY CAROLINAS The following tables provide recorded balances for assets and liabilities measured at fair value on a recurring basis on the Consolidated Balance Sheets. December 31, 2021 (in millions) Total Fair Value Level 1 Level 2 Not Categorized NDTF cash and cash equivalents $ 53 $ 53 $ — $ — NDTF equity securities 4,265 4,215 — 50 NDTF debt securities 1,441 339 1,102 — Derivative assets 162 — 162 — Total assets 5,921 4,607 1,264 50 Derivative liabilities (35) — (35) — Net assets $ 5,886 $ 4,607 $ 1,229 $ 50 December 31, 2020 (in millions) Total Fair Value Level 1 Level 2 Not Categorized NDTF cash and cash equivalents $ 30 $ 30 $ — $ — NDTF equity securities 3,685 3,639 — 46 NDTF debt securities 1,250 192 1,058 — Derivative assets 20 — 20 — Total assets 4,985 3,861 1,078 46 Derivative liabilities (20) — (20) — Net assets $ 4,965 $ 3,861 $ 1,058 $ 46 PROGRESS ENERGY The following table provides recorded balances for assets and liabilities measured at fair value on a recurring basis on the Consolidated Balance Sheets. December 31, 2021 December 31, 2020 (in millions) Total Fair Value Level 1 Level 2 Total Fair Value Level 1 Level 2 NDTF cash and cash equivalents $ 107 $ 107 $ — $ 147 $ 147 $ — NDTF equity securities 3,085 3,085 — 2,550 2,550 — NDTF debt securities 1,450 628 822 1,467 682 785 Other debt securities 26 — 26 26 — 26 Other cash and cash equivalents 20 20 — 106 106 Derivative assets 124 — 124 33 — 33 Total assets 4,812 3,840 972 4,329 3,485 844 Derivative liabilities (24) — (24) (29) — (29) Net assets $ 4,788 $ 3,840 $ 948 $ 4,300 $ 3,485 $ 815 DUKE ENERGY PROGRESS The following table provides recorded balances for assets and liabilities measured at fair value on a recurring basis on the Consolidated Balance Sheets. December 31, 2021 December 31, 2020 (in millions) Total Fair Value Level 1 Level 2 Total Fair Value Level 1 Level 2 NDTF cash and cash equivalents $ 94 $ 94 $ — $ 76 $ 76 $ — NDTF equity securities 2,970 2,970 — 2,459 2,459 — NDTF debt securities 1,025 289 736 993 237 756 Other cash and cash equivalents 16 16 — 1 1 — Derivative assets 124 — 124 33 — 33 Total assets 4,229 3,369 860 3,562 2,773 789 Derivative liabilities (10) — (10) (14) — (14) Net assets $ 4,219 $ 3,369 $ 850 $ 3,548 $ 2,773 $ 775 DUKE ENERGY FLORIDA The following table provides recorded balances for assets and liabilities measured at fair value on a recurring basis on the Consolidated Balance Sheets. December 31, 2021 December 31, 2020 (in millions) Total Fair Value Level 1 Level 2 Total Fair Value Level 1 Level 2 NDTF cash and cash equivalents $ 13 $ 13 $ — $ 71 $ 71 $ — NDTF equity securities 115 115 — 91 91 — NDTF debt securities 425 339 86 474 445 29 Other debt securities 26 — 26 26 — 26 Other cash and cash equivalents 3 3 — 1 1 — Total assets 582 470 112 663 608 55 Derivative liabilities (14) — (14) — — — Net assets $ 568 $ 470 $ 98 $ 663 $ 608 $ 55 DUKE ENERGY OHIO The recorded balances for assets and liabilities measured at fair value on a recurring basis on the Consolidated Balance Sheets were not material at December 31, 2021, and 2020. DUKE ENERGY INDIANA The following table provides recorded balances for assets and liabilities measured at fair value on a recurring basis on the Consolidated Balance Sheets. December 31, 2021 December 31, 2020 (in millions) Total Fair Value Level 1 Level 2 Level 3 Total Fair Value Level 1 Level 2 Level 3 Other equity securities $ 97 $ 97 $ — $ — $ 97 $ 97 $ — $ — Other debt securities 64 — 64 — 45 — 45 — Other cash equivalents — — — — 1 1 — — Derivative assets 23 1 — 22 6 — — 6 Total assets 184 98 64 22 149 98 45 6 Derivative liabilities (27) (13) (14) — (1) (1) — — Net assets $ 157 $ 85 $ 50 $ 22 $ 148 $ 97 $ 45 $ 6 The following table provides a reconciliation of beginning and ending balances of assets and liabilities measured at fair value using Level 3 measurements. Derivatives (net) Years Ended December 31, (in millions) 2021 2020 Balance at beginning of period $ 6 $ 11 Purchases, sales, issuances and settlements: Purchases 18 10 Settlements (16) (13) Total gains (losses) included on the Consolidated Balance Sheet 14 (2) Balance at end of period $ 22 $ 6 PIEDMONT The following table provides recorded balances for assets and liabilities measured at fair value on a recurring basis on the Consolidated Balance Sheets. December 31, 2021 December 31, 2020 (in millions) Total Fair Value Level 1 Level 2 Total Fair Value Level 1 Level 2 Derivative assets $ 3 $ 3 $ — $ 1 $ 1 $ — Derivative liabilities (139) — (139) (122) — (122) Net (liabilities) assets $ (136) $ 3 $ (139) $ (121) $ 1 $ (122) The following table provides a reconciliation of beginning and ending balances of assets and liabilities measured at fair value using Level 3 measurements. Derivatives (net) Year Ended December 31, (in millions) 2020 Balance at beginning of period $ (117) Net transfers Out of Level 3 (a) 117 Balance at end of period $ — (a) Transferred from Level 3 to Level 2 because observable market data became available. QUANTITATIVE INFORMATION ABOUT UNOBSERVABLE INPUTS The following tables include quantitative information about the Duke Energy Registrants' derivatives classified as Level 3. December 31, 2021 Weighted Fair Value Average Investment Type (in millions) Valuation Technique Unobservable Input Range Range Duke Energy Electricity contracts $ (145) RTO forward pricing Forward electricity curves – price per MWh $ 19.04 – $ 139.11 $ 37.57 Duke Energy Ohio FTRs 2 RTO auction pricing FTR price – per MWh 0.06 – 1.79 0.96 Duke Energy Indiana FTRs 22 RTO auction pricing FTR price – per MWh (1.18) – 13.11 2.68 Duke Energy Total Level 3 derivatives $ (121) December 31, 2020 Weighted Fair Value Average Investment Type (in millions) Valuation Technique Unobservable Input Range Range Duke Energy Electricity contracts $ (84) Discounted cash flow Forward electricity curves – price per MWh $ 14.68 – $ 151.84 $ 28.84 Duke Energy Ohio FTRs 1 RTO auction pricing FTR price – per MWh 0.25 – 1.68 0.79 Duke Energy Indiana FTRs 6 RTO auction pricing FTR price – per MWh (2.40) – 7.41 1.05 Duke Energy Total Level 3 derivatives $ (77) OTHER FAIR VALUE DISCLOSURES The fair value and book value of long-term debt, including current maturities, is summarized in the following table. Estimates determined are not necessarily indicative of amounts that could have been settled in current markets. Fair value of long-term debt uses Level 2 measurements. December 31, 2021 December 31, 2020 (in millions) Book Value Fair Value Book Value Fair Value Duke Energy (a) $ 63,835 $ 69,683 $ 59,863 $ 69,292 Duke Energy Carolinas 13,275 15,101 12,218 14,917 Progress Energy 20,823 23,751 19,264 23,470 Duke Energy Progress 10,249 11,252 9,258 10,862 Duke Energy Florida 8,482 9,772 7,915 9,756 Duke Energy Ohio 3,193 3,570 3,089 3,650 Duke Energy Indiana 4,323 5,067 4,091 5,204 Piedmont 2,968 3,278 2,780 3,306 (a) Book value of long-term de bt includes $1.25 billion as of December 31, 2021, and $1.3 billion as of December 31, 2020, of unamortized debt discount and premium, net in purchase accounting adjustments related to the mergers with Progress Energy and Piedmont that are excluded from fair value of long-term debt. At both December 31, 2021, and December 31, 2020, fair value of cash and cash equivalents, accounts and notes receivable, accounts payable, notes payable and commercial paper, and nonrecourse notes payable of VIEs are not materially different from their carrying amounts because of the short-term nature of these instruments and/or because the stated rates approximate market rates.

Variable Interest Entities

Variable Interest Entities	12 Months Ended
	Dec. 31, 2021
Variable Interest Entities [Abstract]
Variable Interest Entities	VARIABLE INTEREST ENTITIES A VIE is an entity that is evaluated for consolidation using more than a simple analysis of voting control. The analysis to determine whether an entity is a VIE considers contracts with an entity, credit support for an entity, the adequacy of the equity investment of an entity and the relationship of voting power to the amount of equity invested in an entity. This analysis is performed either upon the creation of a legal entity or upon the occurrence of an event requiring reevaluation, such as a significant change in an entity’s assets or activities. A qualitative analysis of control determines the party that consolidates a VIE. This assessment is based on (i) what party has the power to direct the activities of the VIE that most significantly impact its economic performance and (ii) what party has rights to receive benefits or is obligated to absorb losses that could potentially be significant to the VIE. The analysis of the party that consolidates a VIE is a continual reassessment. CONSOLIDATED VIEs The obligations of the consolidated VIEs discussed in the following paragraphs are nonrecourse to the Duke Energy Registrants. The registrants have no requirement to provide liquidity to, purchase assets of or guarantee performance of these VIEs unless noted in the following paragraphs. No financial support was provided to any of the consolidated VIEs during the years ended December 31, 2021, 2020 and 2019, or is expected to be provided in the future, that was not previously contractually required. Receivables Financing – DERF/DEPR/DEFR DERF, DEPR and DEFR are bankruptcy remote, special purpose subsidiaries of Duke Energy Carolinas, Duke Energy Progress and Duke Energy Florida, respectively. DERF, DEPR and DEFR are wholly owned LLCs with separate legal existence from their parent companies, and their assets are not generally available to creditors of their parent companies. On a revolving basis, DERF, DEPR and DEFR buy certain accounts receivable arising from the sale of electricity and related services from their parent companies. DERF, DEPR and DEFR borrow amounts under credit facilities to buy these receivables. Borrowing availability from the credit facilities is limited to the amount of qualified receivables purchased, which generally exclude receivables past due more than a predetermined number of days and reserves for expected past-due balances. The sole source of funds to satisfy the related debt obligations is cash collections from the receivables. Amounts borrowed under the credit facilities are reflected on the Consolidated Balance Sheets as Long-Term Debt. The most significant activity that impacts the economic performance of DERF, DEPR and DEFR are the decisions made to manage delinquent receivables. Duke Energy Carolinas, Duke Energy Progress and Duke Energy Florida are considered the primary beneficiaries and consolidate DERF, DEPR and DEFR, respectively, as they make those decisions. Receivables Financing – CRC CRC is a bankruptcy remote, special purpose entity indirectly owned by Duke Energy. On a revolving basis, CRC buys certain accounts receivable arising from the sale of electricity, natural gas and related services from Duke Energy Ohio and Duke Energy Indiana. CRC borrows amounts under a credit facility to buy the receivables from Duke Energy Ohio and Duke Energy Indiana. Borrowing availability from the credit facility is limited to the amount of qualified receivables sold to CRC, which generally exclude receivables past due more than a predetermined number of days and reserves for expected past-due balances. The sole source of funds to satisfy the related debt obligation is cash collections from the receivables. Amounts borrowed under the credit facility are reflected on Duke Energy's Consolidated Balance Sheets as Long-Term Debt. The proceeds Duke Energy Ohio and Duke Energy Indiana receive from the sale of receivables to CRC are approximately 75% cash and 25% in the form of a subordinated note from CRC. The subordinated note is a retained interest in the receivables sold. Depending on collection experience, additional equity infusions to CRC may be required by Duke Energy to maintain a minimum equity balance of $3 million. CRC is considered a VIE because (i) equity capitalization is insufficient to support its operations, (ii) power to direct the activities that most significantly impact the economic performance of the entity is not held by the equity holder and (iii) deficiencies in net worth of CRC are funded by Duke Energy. The most significant activities that impact the economic performance of CRC are decisions made to manage delinquent receivables. Duke Energy is considered the primary beneficiary and consolidates CRC as it makes these decisions. Neither Duke Energy Ohio nor Duke Energy Indiana consolidate CRC. Receivables Financing – Credit Facilities The following table summarizes the amounts and expiration dates of the credit facilities and associated restricted receivables described above. Duke Energy Duke Energy Duke Energy Duke Energy Carolinas Progress Florida (in millions) CRC DERF DEPR DEFR Expiration date February 2023 January 2025 April 2023 April 2023 Credit facility amount $ 350 $ 475 $ 350 $ 250 Amounts borrowed at December 31, 2021 350 475 350 250 Amounts borrowed at December 31, 2020 350 364 250 250 Restricted Receivables at December 31, 2021 587 844 574 427 Restricted Receivables at December 31, 2020 547 696 500 397 Nuclear Asset-Recovery Bonds – Duke Energy Florida Project Finance, LLC (DEFPF) DEFPF is a bankruptcy remote, wholly owned special purpose subsidiary of Duke Energy Florida. DEFPF was formed in 2016 for the sole purpose of issuing nuclear asset-recovery bonds to finance Duke Energy Florida's unrecovered regulatory asset related to Crystal River Unit 3. In 2016, DEFPF issued senior secured bonds and used the proceeds to acquire nuclear asset-recovery property from Duke Energy Florida. The nuclear asset-recovery property acquired includes the right to impose, bill, collect and adjust a non-bypassable nuclear asset-recovery charge from all Duke Energy Florida retail customers until the bonds are paid in full and all financing costs have been recovered. The nuclear asset-recovery bonds are secured by the nuclear asset-recovery property and cash collections from the nuclear asset-recovery charges are the sole source of funds to satisfy the debt obligation. The bondholders have no recourse to Duke Energy Florida. DEFPF is considered a VIE primarily because the equity capitalization is insufficient to support its operations. Duke Energy Florida has the power to direct the significant activities of the VIE as described above and therefore Duke Energy Florida is considered the primary beneficiary and consolidates DEFPF. The following table summarizes the impact of DEFPF on Duke Energy Florida's Consolidated Balance Sheets. December 31, (in millions) 2021 2020 Receivables of VIEs $ 5 $ 4 Regulatory Assets: Current 54 53 Current Assets: Other 39 39 Other Noncurrent Assets: Regulatory assets 883 937 Current Liabilities: Other 9 10 Current maturities of long-term debt 56 55 Long-Term Debt 946 1,002 Storm Recovery Bonds – Duke Energy Carolinas NC Storm Funding and Duke Energy Progress NC Storm Funding Duke Energy Carolinas NC Storm Funding, LLC. (DECNCSF) and Duke Energy Progress NC Storm Funding, LLC. (DEPNCSF) are bankruptcy remote, wholly owned special purpose subsidiaries of Duke Energy Carolinas and Duke Energy Progress, respectively. These entities were formed in 2021 for the sole purpose of issuing storm recovery bonds to finance certain of Duke Energy Carolinas’ and Duke Energy Progress’ unrecovered regulatory assets related to storm costs. In November 2021, DECNCSF and DEPNCSF issued $237 million and $770 million of senior secured bonds, respectively and used the proceeds to acquire storm recovery property from Duke Energy Carolinas and Duke Energy Progress. The storm recovery property was created by state legislation and NCUC financing orders for the purpose of financing storm costs incurred in 2018 and 2019. The storm recovery property acquired includes the right to impose, bill, collect and adjust a non-bypassable charge from all Duke Energy Carolinas’ and Duke Energy Progress’ retail customers until the bonds are paid in full and all financing costs have been recovered. The storm recovery bonds are secured by the storm recovery property and cash collections from the storm recovery charges are the sole source of funds to satisfy the debt obligation. The bondholders have no recourse to Duke Energy Carolinas or Duke Energy Progress. For additional information, see Notes 3 and 6. DECNCSF and DEPNCSF are considered VIEs primarily because the equity capitalization is insufficient to support their operations. Duke Energy Carolinas and Duke Energy Progress have the power to direct the significant activities of the VIEs as described above and therefore Duke Energy Carolinas and Duke Energy Progress are considered the primary beneficiaries and consolidate DECNCSF and DEPNCSF, respectively. The following table summarizes the impact of these VIEs on Duke Energy Carolinas’ and Duke Energy Progress’ Consolidated Balance Sheets. December 31, 2021 Duke Energy Duke Energy (in millions) Carolinas Progress Regulatory Assets: Current $ 12 $ 39 Other Noncurrent Assets: Regulatory assets 220 720 Other Noncurrent Assets: Other 1 4 Interest Accrued 1 2 Current maturities of long-term debt 5 15 Long-Term Debt 228 747 Commercial Renewables Certain of Duke Energy’s renewable energy facilities are VIEs due to Duke Energy issuing guarantees for debt service and operations and maintenance reserves in support of debt financings. Assets are restricted and cannot be pledged as collateral or sold to third parties without prior approval of debt holders. Additionally, Duke Energy has VIEs associated with tax equity arrangements entered into with third-party investors in order to finance the cost of renewable assets eligible for tax credits. The activities that most significantly impacted the economic performance of these renewable energy facilities were decisions associated with siting, negotiating PPAs and EPC agreements, and decisions associated with ongoing operations and maintenance-related activities. Duke Energy is considered the primary beneficiary and consolidates the entities as it is responsible for all of these decisions. The table below presents material balances reported on Duke Energy's Consolidated Balance Sheets related to Commercial Renewables VIEs. December 31, (in millions) 2021 2020 Current Assets: Other $ 215 $ 257 Property, Plant and Equipment: Cost 7,339 6,394 Accumulated depreciation and amortization (1,474) (1,242) Other Noncurrent Assets: Other 62 67 Current maturities of long-term debt 167 167 Long-Term Debt 1,475 1,569 Other Noncurrent Liabilities: AROs 173 148 Other Noncurrent Liabilities: Other 319 316 NON-CONSOLIDATED VIEs The following tables summarize the impact of non-consolidated VIEs on the Consolidated Balance Sheets. December 31, 2021 Duke Energy Duke Duke Pipeline Commercial Energy Energy (in millions) Investments Renewables Total Ohio Indiana Receivables from affiliated companies $ — $ — $ — $ 79 $ 97 Investments in equity method unconsolidated affiliates 15 508 523 — — Other noncurrent assets 61 — 61 — — Total assets $ 76 $ 508 $ 584 $ 79 $ 97 Other current liabilities 47 4 51 — — Other noncurrent liabilities 54 3 57 — — Total liabilities $ 101 $ 7 $ 108 $ — $ — Net (liabilities) assets $ (25) $ 501 $ 476 $ 79 $ 97 December 31, 2020 Duke Energy Duke Duke Pipeline Commercial Energy Energy (in millions) Investments Renewables Total Ohio Indiana Receivables from affiliated companies $ — $ — $ — $ 83 $ 110 Investments in equity method unconsolidated affiliates — 530 530 — — Other noncurrent assets 31 — 31 — — Total assets $ 31 $ 530 $ 561 $ 83 $ 110 Other current liabilities 928 5 933 — — Other noncurrent liabilities 8 10 18 — — Total liabilities $ 936 $ 15 $ 951 $ — $ — Net (liabilities) assets $ (905) $ 515 $ (390) $ 83 $ 110 The Duke Energy Registrants are not aware of any situations where the maximum exposure to loss significantly exceeds the carrying values shown above except for certain renewable energy project entities guarantees for debt services and operations and maintenance, as discussed below. Pipeline Investments Duke Energy has investments in various joint ventures to construct and operate pipeline projects. These entities are considered VIEs due to having insufficient equity to finance their own activities without subordinated financial support. Duke Energy does not have the power to direct the activities that most significantly impact the economic performance, the obligation to absorb losses or the right to receive benefits of these VIEs and therefore does not consolidate these entities. Duke Energy has a 47% ownership interest in ACP. In 2020, Duke Energy determined that it would no longer invest in the construction of the ACP pipeline. In February 2021, Duke Energy paid approximately $855 million to fund ACP's outstanding debt, relieving Duke Energy of its guarantee. See Notes 3, 7 and 12 for further information regarding this transaction. Commercial Renewables Duke Energy has investments in various renewable energy project entities. Duke Energy has a 50% ownership in a VIE, which owns a portfolio of wind projects. This entity is a VIE as a result of Duke Energy issuing guarantees for debt service and operations and maintenance reserves in support of debt financings. Duke Energy does not consolidate this VIE because power to direct and control key activities is shared jointly by Duke Energy and the other owner. Duke Energy also has equity ownership in an entity, which owns a portfolio of fuel cell projects. Duke Energy does not consolidate the fuel cell portfolio as it does not have the power to direct the activities that most significantly impact the economic performance of the entity. OVEC Duke Energy Ohio’s 9% ownership interest in OVEC is considered a non-consolidated VIE due to OVEC having insufficient equity to finance its activities without subordinated financial support. The activities that most significantly impact OVEC's economic performance include fuel strategy and supply activities and decisions associated with ongoing operations and maintenance-related activities. Duke Energy Ohio does not have the unilateral power to direct these activities, and therefore, does not consolidate OVEC. As a counterparty to an Inter-Company Power Agreement (ICPA), Duke Energy Ohio has a contractual arrangement to receive entitlements to capacity and energy from OVEC’s power plants through June 2040 commensurate with its power participation ratio, which is equivalent to Duke Energy Ohio's ownership interest. Costs, including fuel, operating expenses, fixed costs, debt amortization and interest expense, are allocated to counterparties to the ICPA based on their power participation ratio. The value of the ICPA is subject to variability due to fluctuation in power prices and changes in OVEC's cost of business. See Note 3 for additional information. CRC See discussion under Consolidated VIEs for additional information related to CRC. Amounts included in Receivables from affiliated companies in the above table for Duke Energy Ohio and Duke Energy Indiana reflect their retained interest in receivables sold to CRC. These subordinated notes held by Duke Energy Ohio and Duke Energy Indiana are stated at fair value. Carrying values of retained interests are determined by allocating carrying value of the receivables between assets sold and interests retained based on relative fair value. The allocated bases of the subordinated notes are not materially different than their face value because (i) the receivables generally turnover in less than two months, (ii) credit losses are reasonably predictable due to the broad customer base and lack of significant concentration and (iii) the equity in CRC is subordinate to all retained interests and thus would absorb losses first. The hypothetical effect on fair value of the retained interests assuming both a 10% and a 20% unfavorable variation in credit losses or discount rates is not material due to the short turnover of receivables and historically low credit loss history. Interest accrues to Duke Energy Ohio and Duke Energy Indiana on the retained interests using the acceptable yield method. This method generally approximates the stated rate on the notes since the allocated basis and the face value are nearly equivalent. An impairment charge is recorded against the carrying value of both retained interests and purchased beneficial interest whenever it is determined that an OTTI has occurred. Key assumptions used in estimating fair value are detailed in the following table. Duke Energy Ohio Duke Energy Indiana 2021 2020 2021 2020 Anticipated credit loss ratio 0.5 % 0.5 % 0.3 % 0.3 % Discount rate 1.1 % 1.6 % 1.1 % 1.6 % Receivable turnover rate 13.5 % 13.4 % 11.3 % 11.3 % The following table shows the gross and net receivables sold. Duke Energy Ohio Duke Energy Indiana December 31, December 31, (in millions) 2021 2020 2021 2020 Receivables sold $ 269 $ 270 $ 328 $ 344 Less: Retained interests 79 83 97 110 Net receivables sold $ 190 $ 187 $ 231 $ 234 The following table shows sales and cash flows related to receivables sold. Duke Energy Ohio Duke Energy Indiana Years Ended December 31, Years Ended December 31, (in millions) 2021 2020 2019 2021 2020 2019 Sales Receivables sold $ 2,023 $ 1,905 $ 1,979 $ 2,909 $ 2,631 $ 2,837 Loss recognized on sale 10 10 14 13 12 17 Cash flows Cash proceeds from receivables sold 2,018 1,875 1,993 2,909 2,586 2,860 Collection fees received 1 1 1 1 1 1 Return received on retained interests 4 4 6 6 5 9 Cash flows from sales of receivables are reflected within Cash Flows From Operating Activities and Cash Flows from Investing Activities on Duke Energy Ohio’s and Duke Energy Indiana’s Consolidated Statements of Cash Flows. Collection fees received in connection with servicing transferred accounts receivable are included in Operation, maintenance and other on Duke Energy Ohio’s and Duke Energy Indiana’s Consolidated Statements of Operations and Comprehensive Income. The loss recognized on sales of receivables is calculated monthly by multiplying receivables sold during the month by the required discount. The required discount is derived monthly utilizing a three-year weighted average formula that considers charge-off history, late charge history and turnover history on the sold receivables, as well as a component for the time value of money. The discount rate, or component for the time value of money, is the prior month-end LIBOR plus a fixed rate of 1%.

Revenue

Revenue	12 Months Ended
	Dec. 31, 2021
Revenue from Contract with Customer [Abstract]
Revenue	REVENUE Duke Energy recognizes revenue consistent with amounts billed under tariff offerings or at contractually agreed upon rates based on actual physical delivery of electric or natural gas service, including estimated volumes delivered when billings have not yet occurred. As such, the majority of Duke Energy’s revenues have fixed pricing based on the contractual terms of the published tariffs, with variability in expected cash flows attributable to the customer’s volumetric demand and ultimate quantities of energy or natural gas supplied and used during the billing period. The stand-alone selling price of related sales are designed to support recovery of prudently incurred costs and an appropriate return on invested assets and are primarily governed by published tariff rates or contractual agreements approved by relevant regulatory bodies. As described in Note 1, certain excise taxes and franchise fees levied by state or local governments are required to be paid even if not collected from the customer. These taxes are recognized on a gross basis as part of revenues. Duke Energy elects to account for all other taxes net of revenues. Performance obligations are satisfied over time as energy or natural gas is delivered and consumed with billings generally occurring monthly and related payments due within 30 days, depending on regulatory requirements. In no event does the timing between payment and delivery of the goods and services exceed one year. Using this output method for revenue recognition provides a faithful depiction of the transfer of electric and natural gas service as customers obtain control of the commodity and benefit from its use at delivery. Additionally, Duke Energy has an enforceable right to consideration for energy or natural gas delivered at any discrete point in time and will recognize revenue at an amount that reflects the consideration to which Duke Energy is entitled for the energy or natural gas delivered. As described above, the majority of Duke Energy’s tariff revenues are at-will and, as such, related contracts with customers have an expected duration of one year or less and will not have future performance obligations for disclosure. Additionally, other long-term revenue streams, including wholesale contracts, generally provide services that are part of a single performance obligation, the delivery of electricity or natural gas. As such, other than material fixed consideration under long-term contracts, related disclosures for future performance obligations are also not applicable. Duke Energy earns substantially all of its revenues through its reportable segments, Electric Utilities and Infrastructure, Gas Utilities and Infrastructure and Commercial Renewables. Electric Utilities and Infrastructure Electric Utilities and Infrastructure earns the majority of its revenues through retail and wholesale electric service through the generation, transmission, distribution and sale of electricity. Duke Energy generally provides retail and wholesale electric service customers with their full electric load requirements or with supplemental load requirements when the customer has other sources of electricity. Retail electric service is generally marketed throughout Duke Energy's electric service territory through standard service offers. The standard service offers are through tariffs determined by regulators in Duke Energy's regulated service territory. Each tariff, which is assigned to customers based on customer class, has multiple components such as an energy charge, a demand charge, a basic facilities charge and applicable riders. Duke Energy considers each of these components to be aggregated into a single performance obligation for providing electric service, or in the case of distribution only customers in Duke Energy Ohio, for delivering electricity. Electricity is considered a single performance obligation satisfied over time consistent with the series guidance and is provided and consumed over the billing period, generally one month. Retail electric service is typically provided to at-will customers who can cancel service at any time, without a substantive penalty. Additionally, Duke Energy adheres to applicable regulatory requirements in each jurisdiction to ensure the collectability of amounts billed and appropriate mitigating procedures are followed when necessary. As such, revenue from contracts with customers for such contracts is equivalent to the electricity supplied and billed in that period (including unbilled estimates). Wholesale electric service is generally provided under long-term contracts using cost-based pricing. FERC regulates costs that may be recovered from customers and the amount of return companies are permitted to earn. Wholesale contracts include both energy and demand charges. For full requirements contracts, Duke Energy considers both charges as a single performance obligation for providing integrated electric service. For contracts where energy and demand charges are considered separate performance obligations, energy and demand are each a distinct performance obligation under the series guidance and are satisfied as energy is delivered and stand-ready service is provided on a monthly basis. This service represents consumption over the billing period and revenue is recognized consistent with billings and unbilled estimates, which generally occur monthly. Contractual amounts owed are typically trued up annually based upon incurred costs in accordance with FERC published filings and the specific customer’s actual peak demand. Estimates of variable consideration related to potential additional billings or refunds owed are updated quarterly. The majority of wholesale revenues are full requirements contracts where the customers purchase the substantial majority of their energy needs and do not have a fixed quantity of contractually required energy or capacity. As such, related forecasted revenues are considered optional purchases. Supplemental requirements contracts that include contracted blocks of energy and capacity at contractually fixed prices have the following estimated remaining performance obligations: Remaining Performance Obligations (in millions) 2022 2023 2024 2025 2026 Thereafter Total Progress Energy $ 109 $ 53 $ 45 $ 7 $ 7 $ 43 $ 264 Duke Energy Progress 8 8 8 — — — 24 Duke Energy Florida 101 45 37 7 7 43 240 Duke Energy Indiana 1 9 14 14 14 12 64 Revenues for block sales are recognized monthly as energy is delivered and stand-ready service is provided, consistent with invoiced amounts and unbilled estimates. Gas Utilities and Infrastructure Gas Utilities and Infrastructure earns its revenue through retail and wholesale natural gas service through the transportation, distribution and sale of natural gas. Duke Energy generally provides retail and wholesale natural gas service customers with all natural gas load requirements. Additionally, while natural gas can be stored, substantially all natural gas provided by Duke Energy is consumed by customers simultaneously with receipt of delivery. Retail natural gas service is marketed throughout Duke Energy's natural gas service territory using published tariff rates. The tariff rates are established by regulators in Duke Energy's service territories. Each tariff, which is assigned to customers based on customer class, have multiple components, such as a commodity charge, demand charge, customer or monthly charge and transportation costs. Duke Energy considers each of these components to be aggregated into a single performance obligation for providing natural gas service. For contracts where Duke Energy provides all of the customer’s natural gas needs, the delivery of natural gas is considered a single performance obligation satisfied over time, and revenue is recognized monthly based on billings and unbilled estimates as service is provided and the commodity is consumed over the billing period. Additionally, natural gas service is typically at-will and customers can cancel service at any time, without a substantive penalty. Duke Energy also adheres to applicable regulatory requirements to ensure the collectability of amounts billed and receivable and appropriate mitigating procedures are followed when necessary. Certain long-term individually negotiated contracts exist to provide natural gas service. These contracts are regulated and approved by state commissions. The negotiated contracts have multiple components, including a natural gas and a demand charge, similar to retail natural gas contracts. Duke Energy considers each of these components to be a single performance obligation for providing natural gas service. This service represents consumption over the billing period, generally one month. Fixed capacity payments under long-term contracts for the Gas Utilities and Infrastructure segment include minimum margin contracts and supply arrangements with municipalities and power generation facilities. Revenues for related sales are recognized monthly as natural gas is delivered and stand-ready service is provided, consistent with invoiced amounts and unbilled estimates. Estimated remaining performance obligations are as follows: Remaining Performance Obligations (in millions) 2022 2023 2024 2025 2026 Thereafter Total Piedmont $ 71 $ 64 $ 61 $ 60 $ 50 $ 286 $ 592 Commercial Renewables Commercial Renewables earns the majority of its revenues through long-term PPAs and generally sells all of its wind and solar facility output, electricity and RECs to customers. The majority of these PPAs have historically been accounted for as leases. For PPAs that are not accounted for as leases, the delivery of electricity and the delivery of RECs are considered separate performance obligations. The delivery of electricity is a performance obligation satisfied over time and represents generation and consumption of the electricity over the billing period, generally one month. The delivery of RECs is a performance obligation satisfied at a point in time and represents delivery of each REC generated by the wind or solar facility. The majority of self-generated RECs are bundled with energy in Duke Energy’s contracts and, as such, related revenues are recognized as energy is generated and delivered as that pattern is consistent with Duke Energy’s performance. Commercial Renewables recognizes revenue based on the energy generated and billed for the period, generally one month, at contractual rates (including unbilled estimates) according to the invoice practical expedient. Amounts are typically due within 30 days of invoice. Commercial Renewables also earns revenues from installation of distributed solar generation resources, which is primarily composed of EPC projects to deliver functioning solar power systems, generally completed within two to 12 months from commencement of construction. The installation of distributed solar generation resources is a performance obligation that is satisfied over time. Revenue from fixed-price EPC contracts is recognized using the input method as work is performed based on the estimated ratio of incurred costs to estimated total costs. Other The remainder of Duke Energy’s operations is presented as Other, which does not include material revenues from contracts with customers. Disaggregated Revenues For the Electric and Gas Utility and Infrastructure segments, revenue by customer class is most meaningful to Duke Energy as each respective customer class collectively represents unique customer expectations of service, generally has different energy and demand requirements, and operates under tailored, regulatory approved pricing structures. Additionally, each customer class is impacted differently by weather and a variety of economic factors including the level of population growth, economic investment, employment levels, and regulatory activities in each of Duke Energy’s jurisdictions. As such, analyzing revenues disaggregated by customer class allows Duke Energy to understand the nature, amount, timing and uncertainty of revenue and cash flows arising from contracts with customers. For the Commercial Renewables segment, the majority of revenues from contracts with customers are from selling all of the unit-contingent output at contractually defined pricing under long-term PPAs with consistent expectations regarding the timing and certainty of cash flows. Disaggregated revenues are presented as follows: Year Ended December 31, 2021 Duke Duke Duke Duke Duke (in millions) Duke Energy Progress Energy Energy Energy Energy By market or type of customer Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Electric Utilities and Infrastructure Residential $ 10,097 $ 3,054 $ 5,084 $ 2,156 $ 2,928 $ 767 $ 1,188 $ — General 6,375 2,210 2,883 1,378 1,505 440 825 — Industrial 2,924 1,145 894 634 260 135 750 — Wholesale 2,199 472 1,385 1,164 221 56 285 — Other revenues 879 264 716 387 329 83 86 — Total Electric Utilities and Infrastructure revenue from contracts with customers $ 22,474 $ 7,145 $ 10,962 $ 5,719 $ 5,243 $ 1,481 $ 3,134 $ — Gas Utilities and Infrastructure Residential $ 1,131 $ — $ — $ — $ — $ 354 $ — $ 777 Commercial 561 — — — — 143 — 418 Industrial 158 — — — — 20 — 137 Power Generation — — — — — — — 92 Other revenues 133 — — — — 28 — 45 Total Gas Utilities and Infrastructure revenue from contracts with customers $ 1,983 $ — $ — $ — $ — $ 545 $ — $ 1,469 Commercial Renewables Revenue from contracts with customers $ 217 $ — $ — $ — $ — $ — $ — $ — Other Revenue from contracts with customers $ 29 $ — $ — $ — $ — $ — $ — $ — Total revenue from contracts with customers $ 24,703 $ 7,145 $ 10,962 $ 5,719 $ 5,243 $ 2,026 $ 3,134 $ 1,469 Other revenue sources (a) $ 394 $ (43) $ 95 $ 61 $ 16 $ 11 $ 40 $ 100 Total revenues $ 25,097 $ 7,102 $ 11,057 $ 5,780 $ 5,259 $ 2,037 $ 3,174 $ 1,569 (a) Other revenue sources include revenues from leases, derivatives and alternative revenue programs that are not considered revenues from contracts with customers. Alternative revenue programs in certain jurisdictions include regulatory mechanisms that periodically adjust for over or under collection of related revenues. Year Ended December 31, 2020 Duke Duke Duke Duke Duke (in millions) Duke Energy Progress Energy Energy Energy Energy By market or type of customer Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Electric Utilities and Infrastructure Residential $ 9,806 $ 2,997 $ 5,017 $ 2,059 $ 2,958 $ 726 $ 1,064 $ — General 6,194 2,233 2,779 1,312 1,467 442 740 — Industrial 2,859 1,137 901 649 252 137 683 — Wholesale 1,864 380 1,228 1,034 194 32 224 — Other revenues 914 281 596 294 302 82 72 — Total Electric Utilities and Infrastructure revenue from contracts with customers $ 21,637 $ 7,028 $ 10,521 $ 5,348 $ 5,173 $ 1,419 $ 2,783 $ — Gas Utilities and Infrastructure Residential $ 930 $ — $ — $ — $ — $ 300 $ — $ 630 Commercial 446 — — — — 117 — 329 Industrial 127 — — — — 17 — 110 Power Generation — — — — — — — 34 Other revenues 87 — — — — 17 — 70 Total Gas Utilities and Infrastructure revenue from contracts with customers $ 1,590 $ — $ — $ — $ — $ 451 $ — $ 1,173 Commercial Renewables Revenue from contracts with customers $ 227 $ — $ — $ — $ — $ — $ — $ — Other Revenue from contracts with customers $ 26 $ — $ — $ — $ — $ — $ — $ — Total revenue from contracts with customers $ 23,480 $ 7,028 $ 10,521 $ 5,348 $ 5,173 $ 1,870 $ 2,783 $ 1,173 Other revenue sources (a) $ 388 $ (13) $ 106 $ 74 $ 15 $ (12) $ 12 $ 124 Total revenues $ 23,868 $ 7,015 $ 10,627 $ 5,422 $ 5,188 $ 1,858 $ 2,795 $ 1,297 (a) Other revenue sources include revenues from leases, derivatives and alternative revenue programs that are not considered revenues from contracts with customers. Alternative revenue programs in certain jurisdictions include regulatory mechanisms that periodically adjust for over or under collection of related revenues. Year Ended December 31, 2019 Duke Duke Duke Duke Duke (in millions) Duke Energy Progress Energy Energy Energy Energy By market or type of customer Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Electric Utilities and Infrastructure Residential $ 9,863 $ 3,044 $ 4,998 $ 2,144 $ 2,854 $ 733 $ 1,087 $ — General 6,431 2,244 2,935 1,368 1,567 451 802 — Industrial 3,071 1,215 934 675 259 147 774 — Wholesale 2,212 462 1,468 1,281 187 46 235 — Other revenues 770 276 548 317 231 80 89 — Total Electric Utilities and Infrastructure revenue from contracts with customers $ 22,347 $ 7,241 $ 10,883 $ 5,785 $ 5,098 $ 1,457 $ 2,987 $ — Gas Utilities and Infrastructure Residential $ 976 $ — $ — $ — $ — $ 315 $ — $ 661 Commercial 508 — — — — 130 — 378 Industrial 141 — — — — 19 — 122 Power Generation — — — — — — — 51 Other revenues 129 — — — — 19 — 110 Total Gas Utilities and Infrastructure revenue from contracts with customers $ 1,754 $ — $ — $ — $ — $ 483 $ — $ 1,322 Commercial Renewables Revenue from contracts with customers $ 223 $ — $ — $ — $ — $ — $ — $ — Other Revenue from contracts with customers $ 24 $ — $ — $ — $ — $ — $ — $ — Total revenue from contracts with customers $ 24,348 $ 7,241 $ 10,883 $ 5,785 $ 5,098 $ 1,940 $ 2,987 $ 1,322 Other revenue sources (a) $ 731 $ 154 $ 319 $ 172 $ 133 $ — $ 17 $ 59 Total revenues $ 25,079 $ 7,395 $ 11,202 $ 5,957 $ 5,231 $ 1,940 $ 3,004 $ 1,381 (a) Other revenue sources include revenues from leases, derivatives and alternative revenue programs that are not considered revenues from contracts with customers. Alternative revenue programs in certain jurisdictions include regulatory mechanisms that periodically adjust for over or under collection of related revenues. As described in Note 1, Duke Energy adopted the new guidance for credit losses effective January 1, 2020, using the modified retrospective method of adoption, which does not require restatement of prior year reported results. The following table presents the reserve for credit losses for trade and other receivables based on adoption of the new standard. Years Ended December 31, 2020 and 2021 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Balance at December 31, 2019 $ 76 $ 10 $ 16 $ 8 $ 7 $ 4 $ 3 $ 6 Cumulative Change in Accounting Principle 5 1 2 1 1 — — 1 Write-Offs (58) (13) (23) (8) (14) — — (6) Credit Loss Expense 75 13 29 9 20 — — 11 Other Adjustments 48 12 13 13 — — — — Balance at December 31, 2020 $ 146 $ 23 $ 37 $ 23 $ 14 $ 4 $ 3 $ 12 Write-Offs (58) (21) (25) (12) (13) — — (9) Credit Loss Expense 54 27 25 11 14 — — 7 Other Adjustments (20) 13 (1) (1) 1 — — 5 Balance at December 31, 2021 $ 122 $ 42 $ 36 $ 21 $ 16 $ 4 $ 3 $ 15 Trade and other receivables are evaluated based on an estimate of the risk of loss over the life of the receivable and current and historical conditions using supportable assumptions. Management evaluates the risk of loss for trade and other receivables by comparing the historical write-off amounts to total revenue over a specified period. Historical loss rates are adjusted due to the impact of current conditions, as well as forecasted conditions over a reasonable time period. The calculated write-off rate can be applied to the receivable balance for which an established reserve does not already exist. Management reviews the assumptions and risk of loss periodically for trade and other receivables. The aging of trade receivables is presented in the table below. Duke Energy considers receivables greater than 30 days outstanding past due. December 31, 2021 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Unbilled Receivables (a)(b) $ 964 $ 316 $ 266 $ 193 $ 73 $ 4 $ 27 $ 106 0-30 days 2,104 595 800 405 393 42 51 202 30-60 days 212 77 72 44 28 4 13 12 60-90 days 88 37 41 21 20 1 1 2 90+ days 249 106 65 37 28 47 11 7 Deferred Payment Arrangements (c) 115 55 45 22 23 2 — 4 Trade and Other Receivables $ 3,732 $ 1,186 $ 1,289 $ 722 $ 565 $ 100 $ 103 $ 333 December 31, 2020 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Unbilled Receivables (a)(b) $ 969 $ 328 $ 283 $ 167 $ 116 $ 2 $ 16 $ 86 0-30 days 1,789 445 707 398 307 60 26 149 30-60 days 185 80 54 25 29 8 3 8 60-90 days 22 1 10 4 6 2 1 3 90+ days 119 16 32 9 23 30 12 9 Deferred Payment Arrangements (c) 215 96 80 52 28 — — 7 Trade and Other Receivables $ 3,299 $ 966 $ 1,166 $ 655 $ 509 $ 102 $ 58 $ 262 (a) Unbilled revenues are recognized by applying customer billing rates to the estimated volumes of energy or natural gas delivered but not yet billed and are included within Receivables and Receivables of VIEs on the Consolidated Balance Sheets. (b) Duke Energy Ohio and Duke Energy Indiana sell, on a revolving basis, nearly all of their retail accounts receivable, including receivables for unbilled revenues, to an affiliate, CRC, and account for the transfers of receivables as sales. Accordingly, the receivables sold are not reflected on the Consolidated Balance Sheets of Duke Energy Ohio and Duke Energy Indiana. See Note 17 for further information. These receivables for unbilled revenues are $82 million and $121 million for Duke Energy Ohio and Duke Energy Indiana, respectively, as of December 31, 2021, and $87 million and $134 million for Duke Energy Ohio and Duke Energy Indiana, respectively, as of December 31, 2020. (c) Due to certain customer financial hardships created by the COVID-19 pandemic and resulting stay-at-home orders, Duke Energy permitted customers to defer payment of past-due amounts through an installment payment plan over a period of several months.

Stockholders' Equity

Stockholders' Equity	12 Months Ended
	Dec. 31, 2021
Equity [Abstract]
Stockholders' Equity	STOCKHOLDERS' EQUITYBasic EPS is computed by dividing net income available to Duke Energy common stockholders, as adjusted for distributed and undistributed earnings allocated to participating securities and accumulated preferred dividends, by the weighted average number of common shares outstanding during the period. Diluted EPS is computed by dividing net income available to Duke Energy common stockholders, as adjusted for distributed and undistributed earnings allocated to participating securities and accumulated preferred dividends, by the diluted weighted average number of common shares outstanding during the period. Diluted EPS reflects the potential dilution that could occur if securities or other agreements to issue common stock, such as equity forward sale agreements, were exercised or settled. Duke Energy’s participating securities are RSUs that are entitled to dividends declared on Duke Energy common stock during the RSUs vesting periods. Dividends declared on preferred stock are recorded on the Consolidated Statements of Operations as a reduction of net income to arrive at net income available to Duke Energy common stockholders. Dividends accumulated on preferred stock are an adjustment to net income used in the calculation of basic and diluted EPS. The following table presents Duke Energy’s basic and diluted EPS calculations, the weighted average number of common shares outstanding and common and preferred share dividends declared. Years Ended December 31, (in millions, except per share amounts) 2021 2020 2019 Net Income available to Duke Energy common stockholders $ 3,802 $ 1,270 $ 3,707 Less: Income (Loss) from discontinued operations 7 7 (7) Accumulated preferred stock dividends adjustment — 1 (15) Less: Impact of participating securities 4 2 5 Income from continuing operations available to Duke Energy common stockholders $ 3,791 $ 1,262 $ 3,694 Weighted average common shares outstanding – basic 769 737 729 Equity forwards — 1 — Weighted average common shares outstanding – diluted 769 738 729 EPS from continuing operations available to Duke Energy common stockholders Basic and Diluted $ 4.93 $ 1.71 $ 5.07 Potentially dilutive items excluded from the calculation (a) 2 2 2 Dividends declared per common share $ 3.90 $ 3.82 $ 3.75 Dividends declared on Series A preferred stock per depositary share $ 1.437 $ 1.437 $ 1.03 Dividends declared on Series B preferred stock per share $ 48.750 $ 49.292 $ — (a) Performance stock awards were not included in the dilutive securities calculation because the performance measures related to the awards had not been met. Common Stock In November 2019, Duke Energy filed a prospectus supplement and executed an Equity Distribution Agreement (EDA) under which it may sell up to $1.5 billion of its common stock through a new at-the-market (ATM) offering program, including an equity forward sales component. Under the terms of the EDA, Duke Energy may issue and sell shares of common stock through September 2022. Separately, in November 2019, Duke Energy marketed an equity offering of 28.75 million shares of common stock through an Underwriting Agreement. In connection with the offering, Duke Energy entered into equity forward sales agreements with an initial forward price of $85.99 per share. In March 2020, Duke Energy marketed approximately 940,000 shares of common stock through an equity forward transaction under the ATM with an initial forward price of $89.76 per share. In May 2020, Duke Energy marketed approximately 903,000 shares of common stock through an equity forward transaction under the ATM with an initial forward price of $82.44 per share. In August 2020, Duke Energy marketed approximately 936,000 shares of common stock through an equity forward transaction under the ATM with an initial forward price of $79.52 per share. In December 2020, Duke Energy physically settled the equity forwards by delivering 32 million shares of common stock in exchange for net cash proceeds of approximately $2.6 billion. Preferred Stock On March 29, 2019, Duke Energy completed the issuance of 40 million depositary shares, each representing 1/1,000th share of its Series A Cumulative Redeemable Perpetual Preferred Stock, at a price of $25 per depositary share. The transaction resulted in net proceeds of $973 million after issuance costs with proceeds used for general corporate purposes and to reduce short-term debt. The preferred stock has a $25 liquidation preference per depositary share and earns dividends on a cumulative basis at a rate of 5.75% per annum. Dividends are payable quarterly in arrears on the 16th day of March, June, September and December, and began on June 16, 2019. The Series A Preferred Stock has no maturity or mandatory redemption date, is not redeemable at the option of the holders and includes separate call options. The first call option allows Duke Energy to call the Series A Preferred Stock at a redemption price of $25.50 per depositary share prior to June 15, 2024, in whole but not in part, at any time within 120 days after a ratings event where a rating agency amends, clarifies or changes the criteria it uses to assign equity credit for securities such as the preferred stock. The second call option allows Duke Energy to call the preferred stock, in whole or in part, at any time, on or after June 15, 2024, at a redemption price of $25 per depositary share. Duke Energy is also required to redeem all accumulated and unpaid dividends if either call option is exercised. On September 12, 2019, Duke Energy completed the issuance of 1 million shares of its Series B Fixed-Rate Reset Cumulative Redeemable Perpetual Preferred Stock, at a price of $1,000 per share. The transaction resulted in net proceeds of $989 million after issuance costs with proceeds being used to pay down short-term debt, repay at maturity $500 million senior notes due September 2019, and for general corporate purposes. The preferred stock has a $1,000 liquidation preference per share and earns dividends on a cumulative basis at an initial rate of 4.875% per annum. Dividends are payable semiannually in arrears on the 16th day of March and September, and began on March 16, 2020. On September 16, 2024, the First Call Date, and any fifth anniversary of the First Call Date (each a Reset Date), the dividend rate will reset based on the then current five-year U.S. Treasury rate plus a spread of 3.388%. The Series B Preferred Stock has no maturity or mandatory redemption date, is not redeemable at the option of the holders and includes separate call options. The first call option allows Duke Energy to call the Series B Preferred Stock at a redemption price of $1,020 per share, in whole but not in part, at any time within 120 days after a ratings event. The second call option allows Duke Energy to call the preferred stock, in whole or in part, on the First Call Date or any subsequent Reset Date at a redemption price in cash equal to $1,000 per share. Duke Energy is also required to redeem all accumulated and unpaid dividends if either call option is exercised. Dividends issued on its Series A and Series B Preferred Stock are subject to approval by the Board of Directors. However, the deferral of dividend payments on the preferred stock prohibits the declaration of common stock dividends. The Series A and Series B Preferred Stock rank, with respect to dividends and distributions upon liquidation or dissolution: • senior to Common Stock and to each other class or series of capital stock established after the original issue date of the Series A and Series B Preferred Stock that is expressly made subordinated to the Series A and Series B Preferred Stock; • on a parity with any class or series of capital stock established after the original issue date of the Series A and Series B Preferred Stock that is not expressly made senior or subordinated to the Series A or Series B Preferred Stock; • junior to any class or series of capital stock established after the original issue date of the Series A and Series B Preferred Stock that is expressly made senior to the Series A or Series B Preferred Stock; • junior to all existing and future indebtedness (including indebtedness outstanding under Duke Energy's credit facilities, unsecured senior notes, junior subordinated debentures and commercial paper) and other liabilities with respect to assets available to satisfy claims against Duke Energy; and • structurally subordinated to existing and future indebtedness and other liabilities of Duke Energy's subsidiaries and future preferred stock of subsidiaries. Holders of Series A and Series B Preferred Stock have no voting rights with respect to matters that generally require the approval of voting stockholders. The limited voting rights of holders of Series A and Series B Preferred Stock include the right to vote as a single class, respectively, on certain matters that may affect the preference or special rights of the preferred stock, except in the instance that Duke Energy elects to defer the payment of dividends for a total of six quarterly full dividend periods for Series A Preferred Stock or three semiannual full dividend periods for Series B Preferred Stock. If dividends are deferred for a cumulative total of six quarterly full dividend periods for Series A Preferred Stock or three semiannual full dividend periods for Series B Preferred Stock, whether or not for consecutive dividend periods, holders of the respective preferred stock have the right to elect two additional Board members to the Board of Directors.

Severance

Severance	12 Months Ended
	Dec. 31, 2021
Restructuring and Related Activities [Abstract]
Severance	SEVERANCE During 2021, Duke Energy reviewed its operations and identified opportunities for improvement to better serve its customers. This operational review included workforce realignment to ensure the company is staffed with the right skill sets and number of teammates to execute the long-term vision for Duke Energy. As such, Duke Energy extended involuntary severance benefits to certain employees in specific areas as a part of these workforce realignment efforts. During 2020, as a result of partial settlements between Duke Energy Carolinas, Duke Energy Progress and the Public Staff, Duke Energy Carolinas and Duke Energy Progress deferred as Regulatory assets on the Consolidated Balance Sheets, approximately $65 million and $33 million, respectively, of previously recorded severance charges within Operation, maintenance and other on the Consolidated Statements of Operations. These severance charges were previously recorded during 2018, as Duke Energy reviewed its operations and identified opportunities for improvement to better serve its customers. This operational review included the company's workforce strategy and staffing levels to ensure the company was staffed with the right skill sets and number of teammates to execute the long-term vision for Duke Energy. As such, Duke Energy extended voluntary and involuntary severance benefits to certain employees in specific areas as a part of workforce planning and digital transformation efforts. The following table presents the direct and allocated severance and related charges accrued for approximately 290 employees in 2021, 30 e mployees in 2020 and 140 employees in 2019, by the Duke Energy Registrants within Operation, maintenance and other on the Consolidated Statements of Operations. Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Year Ended December 31, 2021 (a)(b) $ 69 $ 33 $ 26 $ 20 $ 6 $ 2 $ 3 $ 2 Year Ended December 31, 2020 (c)(d) (85) (58) (28) (31) 3 — — — Year Ended December 31, 2019 16 8 6 3 3 — 1 1 (a) Includes amortization of deferred severance charges of approximately $33 million, $22 million, $11 million and $11 million for Duke Energy, Duke Energy Carolinas, Progress Energy and Duke Energy Progress, respectively. (b) Includes adjustments associated with 2018 severance charges of approximately $(3) million, $(2) million and $(1) million for Duke Energy, Duke Energy Carolinas and Duke Energy Indiana, respectively. (c) Includes unamortized deferred severance charges of approximately $(86) million, $(57) million, $(29) million and $(29) million for Duke Energy, Duke Energy Carolinas, Progress Energy and Duke Energy Progress, respectively. (d) Includes adjustments associated with 2018 severance charges of approximately $(6) million, $(2) million, $(3) million and $(2) million for Duke Energy, Duke Energy Carolinas, Progress Energy and Duke Energy Progress, respectively. The table below presents the severance liability for past and ongoing severance plans including the plans described above. Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Balance at December 31, 2020 $ 11 $ 2 $ 3 $ 1 $ 2 $ — $ 1 $ — Provision/Adjustments 36 1 1 1 — — — — Cash Reductions (8) (1) (2) (1) (1) — (1) — Balance at December 31, 2021 $ 39 $ 2 $ 2 $ 1 $ 1 $ — $ — $ —

Stock-Based Compensation

Stock-Based Compensation	12 Months Ended
	Dec. 31, 2021
Share-based Payment Arrangement [Abstract]
Stock-Based Compensation	STOCK-BASED COMPENSATION The Duke Energy Corporation 2015 Long-Term Incentive Plan (the 2015 Plan) provides for the grant of stock-based compensation awards to employees and outside directors. The 2015 Plan reserves 10 million shares of common stock for issuance. Duke Energy has historically issued new shares upon exercising or vesting of share-based awards. However, Duke Energy may use a combination of new share issuances and open market repurchases for share-based awards that are exercised or vest in the future. Duke Energy has not determined with certainty the amount of such new share issuances or open market repurchases. The following table summarizes the total expense recognized by the Duke Energy Registrants, net of tax, for stock-based compensation. Years Ended December 31, (in millions) 2021 2020 2019 Duke Energy $ 64 $ 61 $ 65 Duke Energy Carolinas 23 22 24 Progress Energy 24 23 24 Duke Energy Progress 15 15 15 Duke Energy Florida 9 9 9 Duke Energy Ohio 5 4 5 Duke Energy Indiana 6 6 6 Piedmont 3 3 3 Duke Energy's pretax stock-based compensation costs, the tax benefit associated with stock-based compensation expense and stock-based compensation costs capitalized are included in the following table. Years Ended December 31, (in millions) 2021 2020 2019 RSU awards $ 49 $ 46 $ 44 Performance awards 39 38 45 Pretax stock-based compensation cost $ 88 $ 84 $ 89 Stock-based compensation costs capitalized 5 5 5 Stock-based compensation expense $ 83 $ 79 $ 84 Tax benefit associated with stock-based compensation expense $ 19 $ 18 $ 19 RESTRICTED STOCK UNIT AWARDS RSU awards generally vest over periods from immediate to three years. Fair value amounts are based on the market price of Duke Energy's common stock on the grant date. The following table includes information related to RSU awards. Years Ended December 31, 2021 2020 2019 Shares granted (in thousands) 673 498 571 Fair value (in millions) $ 59 $ 50 $ 51 The following table summarizes information about RSU awards outstanding. Weighted Average Shares Grant Date Fair Value (in thousands) (per share) Outstanding at December 31, 2020 939 $ 93 Granted 673 88 Vested (502) 89 Forfeited (67) 92 Outstanding at December 31, 2021 1,043 92 RSU awards expected to vest 996 92 The total grant date fair value of shares vested during the years ended December 31, 2021, 2020 and 2019, was $45 million, $43 million and $49 million, respectively. At December 31, 2021, Duke Energy had $35 million of unrecognized compensation cost, which is expected to be recognized over a weighted average period of 23 months. PERFORMANCE AWARDS Stock-based performance awards generally vest after three years if performance targets are met. The actual number of shares issued will range from zero to 200% of target shares, depending on the level of performance achieved. Performance awards contain performance conditions and a market condition. The performance conditions are based on Duke Energy's cumulative adjusted EPS and total incident case rate (total incident case rate is one of our key employee safety metrics). The market condition is based on TSR of Duke Energy relative to a predefined peer group. Relative TSR is valued using a path-dependent model that incorporates expected relative TSR into the fair value determination of Duke Energy’s performance-based share awards. The model uses three-year historical volatilities and correlations for all companies in the predefined peer group, including Duke Energy, to simulate Duke Energy’s relative TSR as of the end of the performance period. For each simulation, Duke Energy’s relative TSR associated with the simulated stock price at the end of the performance period plus expected dividends within the period results in a value per share for the award portfolio. The average of these simulations is the expected portfolio value per share. Actual life to date results of Duke Energy’s relative TSR for each grant are incorporated within the model. For performance awards granted in 2021, the model used a risk-free interest rate of 0.24%, which reflects the yield on three-year Treasury bonds as of the grant date, and an expected volatility of 26.9% based on Duke Energy's historical volatility over three years using daily stock prices. The following table includes information related to stock-based performance awards. Years Ended December 31, 2021 2020 2019 Shares granted assuming target performance (in thousands) 380 319 320 Fair value (in millions) $ 33 $ 34 $ 27 The following table summarizes information about stock-based performance awards outstanding and assumes payout at the target level. Weighted Average Shares Grant Date Fair Value (in thousands) (per share) Outstanding at December 31, 2020 962 $ 87 Granted 380 88 Vested (346) 73 Forfeited (44) 92 Outstanding at December 31, 2021 952 93 Stock-based performance awards expected to vest 927 93 The total grant date fair value of shares vested during the years ended December 31, 2021, and 2020, was $25 million and $36 million, respectively. At December 31, 2021, Duke Energy had $20 million of unrecognized compensation cost, which is expected to be recognized over a weighted average period of 22 months.

Employee Benefit Plans

Employee Benefit Plans	12 Months Ended
	Dec. 31, 2021
Retirement Benefits [Abstract]
Employee Benefit Plans	EMPLOYEE BENEFIT PLANS DEFINED BENEFIT RETIREMENT PLANS Duke Energy and certain subsidiaries maintain, and the Subsidiary Registrants participate in, qualified, non-contributory defined benefit retirement plans. The Duke Energy plans cover most employees using a cash balance formula. Under a cash balance formula, a plan participant accumulates a retirement benefit consisting of pay credits based upon a percentage of current eligible earnings, age or age and years of service and interest credits. Certain employees are eligible for benefits that use a final average earnings formula. Under these final average earnings formulas, a plan participant accumulates a retirement benefit equal to the sum of percentages of their (i) highest three-, four-, or five-year average earnings, (ii) highest three-, four-, or five-year average earnings in excess of covered compensation per year of participation (maximum of 35 years) or (iii) highest three-year average earnings times years of participation in excess of 35 years. Duke Energy also maintains, and the Subsidiary Registrants participate in, non-qualified, non-contributory defined benefit retirement plans that cover certain executives. The qualified and non-qualified, non-contributory defined benefit plans are closed to new participants. Duke Energy uses a December 31 measurement date for its defined benefit retirement plan assets and obligations. Actuarial losses experienced by the defined benefit retirement plans in remeasuring plan assets as of December 31, 2021, were primarily attributable to actual investment performance that was less than expected investment performance. Actuarial gains experienced by the defined benefit retirement plans in remeasuring plan obligations as of December 31, 2021, were primarily attributable to the increase in the discount rate used to measure plan obligations. Actuarial gains experienced by the defined benefit retirement plans in remeasuring plan assets as of December 31, 2020, were attributable to actual investment performance that exceeded expected investment performance. Actuarial losses experienced by the defined benefit retirement plans in remeasuring plan obligations as of December 31, 2020, were primarily attributable to the decrease in the discount rate used to measure plan obligations. Net periodic benefit costs disclosed in the tables below represent the cost of the respective benefit plan for the periods presented prior to capitalization of amounts reflected as Net property, plant and equipment, on the Consolidated Balance Sheets. Only the service cost component of net periodic benefit costs is eligible to be capitalized. The remaining non-capitalized portions of net periodic benefit costs are classified as either: (1) service cost, which is recorded in Operations, maintenance and other on the Consolidated Statements of Operations; or as (2) components of non-service cost, which is recorded in Other income and expenses, net on the Consolidated Statements of Operations. Amounts presented in the tables below for the Subsidiary Registrants represent the amounts of pension and other post-retirement benefit cost allocated by Duke Energy for employees of the Subsidiary Registrants. Additionally, the Consolidated Statements of Operations of the Subsidiary Registrants also include allocated net periodic benefit costs for their proportionate share of pension and post-retirement benefit cost for employees of Duke Energy’s shared services affiliate that provide support to the Subsidiary Registrants. However, in the tables below, these amounts are only presented within the Duke Energy column (except for amortization of settlement charges). These allocated amounts are included in the governance and shared service costs discussed in Note 13. Duke Energy’s policy is to fund amounts on an actuarial basis to provide assets sufficient to meet benefit payments to be paid to plan participants. Duke Energy does not anticipate making any contributions in 2022. The following table includes information related to the Duke Energy Registrants’ contributions to its qualified defined benefit pension plans. Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Contributions Made: 2021 $ — $ — $ — $ — $ — $ — $ — $ — 2020 — — — — — — — — 2019 77 7 57 4 53 2 2 1 QUALIFIED PENSION PLANS Components of Net Periodic Pension Costs Year Ended December 31, 2021 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Service cost $ 176 $ 56 $ 50 $ 29 $ 21 $ 5 $ 10 $ 6 Interest cost on projected benefit obligation 220 51 70 30 39 13 18 7 Expected return on plan assets (558) (141) (187) (84) (102) (28) (40) (20) Amortization of actuarial loss 133 29 38 18 20 7 13 10 Amortization of prior service credit (29) (8) (2) (1) (1) (1) (2) (9) Amortization of settlement charges 9 5 2 2 1 — — 1 Net periodic pension costs (a)(b) $ (49) $ (8) $ (29) $ (6) $ (22) $ (4) $ (1) $ (5) Year Ended December 31, 2020 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Service cost $ 165 $ 51 $ 48 $ 27 $ 21 $ 5 $ 9 $ 6 Interest cost on projected benefit obligation 269 62 85 38 46 15 22 9 Expected return on plan assets (572) (145) (190) (87) (101) (28) (42) (21) Amortization of actuarial loss 128 28 41 18 23 6 12 9 Amortization of prior service credit (32) (8) (3) (2) (1) — (2) (9) Amortization of settlement charges 18 9 7 6 1 — 1 1 Net periodic pension costs (a)(b) $ (24) $ (3) $ (12) $ — $ (11) $ (2) $ — $ (5) Year Ended December 31, 2019 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Service cost $ 158 $ 49 $ 46 $ 26 $ 20 $ 4 $ 9 $ 5 Interest cost on projected benefit obligation 317 75 100 45 54 18 26 10 Expected return on plan assets (567) (147) (178) (88) (89) (28) (43) (22) Amortization of actuarial loss 108 24 39 15 24 4 8 8 Amortization of prior service credit (32) (8) (3) (2) (1) — (2) (9) Amortization of settlement charge 6 2 1 1 — 2 — — Net periodic pension costs (a)(b) $ (10) $ (5) $ 5 $ (3) $ 8 $ — $ (2) $ (8) (a) Duke Energy amounts exclude $3 million, $4 million and $4 million for the years ended December 2021, 2020 and 2019, respectively, of regulatory asset amortization resulting from purchase accounting adjustments associated with Duke Energy's merger with Cinergy in April 2006. (b) Duke Energy Ohio amounts exclude $1 million, $2 million and $2 million for the years ended December 2021, 2020 and 2019, respectively, of regulatory asset amortization resulting from purchase accounting adjustments associated with Duke Energy's merger with Cinergy in April 2006. Amounts Recognized in Accumulated Other Comprehensive Income and Regulatory Assets Year Ended December 31, 2021 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Regulatory assets, net decrease $ (261) $ (57) $ (128) $ (31) $ (97) $ (17) $ (19) $ (5) Accumulated other comprehensive loss (income) Deferred income tax expense $ 1 $ — $ — $ — $ — $ — $ — $ — Amortization of prior year service credit 1 — — — — — — — Amortization of prior year actuarial losses (8) — (1) — — — — — Net amount recognized in accumulated other comprehensive income $ (6) $ — $ (1) $ — $ — $ — $ — $ — Year Ended December 31, 2020 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Regulatory assets, net (decrease) increase $ (62) $ (39) $ (26) $ (30) $ 4 $ (2) $ 5 $ (1) Accumulated other comprehensive loss (income) Deferred income tax expense $ 2 $ — $ 1 $ — $ 1 $ — $ — $ — Amortization of prior year service credit 1 — — — — — — — Amortization of prior year actuarial losses (11) — (1) — (3) — — — Net amount recognized in accumulated other comprehensive income $ (8) $ — $ — $ — $ (2) $ — $ — $ — Reconciliation of Funded Status to Net Amount Recognized Year Ended December 31, 2021 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Change in Projected Benefit Obligation Obligation at prior measurement date $ 8,634 $ 1,988 $ 2,715 $ 1,193 $ 1,507 $ 502 $ 715 $ 293 Service cost 168 54 48 28 20 5 9 6 Interest cost 220 51 70 30 39 13 18 7 Actuarial gain (200) (42) (108) (18) (89) (10) (10) (5) Benefits paid (615) (148) (161) (80) (81) (50) (52) (28) Transfers — — (4) — (4) (10) — — Obligation at measurement date $ 8,207 $ 1,903 $ 2,560 $ 1,153 $ 1,392 $ 450 $ 680 $ 273 Accumulated Benefit Obligation at measurement date $ 8,144 $ 1,904 $ 2,529 $ 1,154 $ 1,361 $ 439 $ 672 $ 274 Change in Fair Value of Plan Assets Plan assets at prior measurement date $ 9,337 $ 2,381 $ 3,049 $ 1,422 $ 1,605 $ 472 $ 684 $ 343 Actual return on plan assets 513 132 169 79 90 26 37 19 Benefits paid (615) (148) (161) (80) (81) (50) (52) (28) Transfers — — (4) — (4) (10) — — Plan assets at measurement date $ 9,235 $ 2,365 $ 3,053 $ 1,421 $ 1,610 $ 438 $ 669 $ 334 Funded status of plan $ 1,028 $ 462 $ 493 $ 268 $ 218 $ (12) $ (11) $ 61 Year Ended December 31, 2020 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Change in Projected Benefit Obligation Obligation at prior measurement date $ 8,321 $ 1,923 $ 2,608 $ 1,170 $ 1,424 $ 481 $ 693 $ 292 Service cost 157 49 46 26 20 4 8 5 Interest cost 269 62 85 38 46 15 22 9 Actuarial loss 433 83 144 50 93 21 46 14 Benefits paid (541) (137) (160) (83) (76) (34) (49) (27) Benefits paid – settlements (5) — — — — — (5) — Transfers — 8 (8) (8) — 15 — — Obligation at measurement date $ 8,634 $ 1,988 $ 2,715 $ 1,193 $ 1,507 $ 502 $ 715 $ 293 Accumulated Benefit Obligation at measurement date $ 8,577 $ 1,989 $ 2,684 $ 1,194 $ 1,476 $ 493 $ 709 $ 294 Change in Fair Value of Plan Assets Plan assets at prior measurement date $ 8,910 $ 2,263 $ 2,898 $ 1,364 $ 1,515 $ 443 $ 667 $ 335 Actual return on plan assets 973 247 319 149 166 48 71 35 Benefits paid (541) (137) (160) (83) (76) (34) (49) (27) Benefits paid – settlements (5) — — — — — (5) — Transfers — 8 (8) (8) — 15 — — Plan assets at measurement date $ 9,337 $ 2,381 $ 3,049 $ 1,422 $ 1,605 $ 472 $ 684 $ 343 Funded status of plan $ 703 $ 393 $ 334 $ 229 $ 98 $ (30) $ (31) $ 50 Amounts Recognized in the Consolidated Balance Sheets December 31, 2021 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Prefunded pension (a) $ 1,071 $ 462 $ 494 $ 268 $ 219 $ 74 $ 100 $ 61 Noncurrent pension liability (b) $ 43 $ — $ 1 $ — $ 1 $ 86 $ 111 $ — Net asset (liability) recognized $ 1,028 $ 462 $ 493 $ 268 $ 218 $ (12) $ (11) $ 61 Regulatory assets $ 1,649 $ 324 $ 563 $ 252 $ 311 $ 93 $ 190 $ 75 Accumulated other comprehensive (income) loss Deferred income tax benefit $ (20) $ — $ — $ — $ — $ — $ — $ — Prior service credit (1) — — — — — — — Net actuarial loss 92 — 1 — — — — — Net amounts recognized in accumulated other comprehensive loss $ 71 $ — $ 1 $ — $ — $ — $ — $ — December 31, 2020 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Prefunded pension (a) $ 780 $ 393 $ 379 $ 229 $ 143 $ 58 $ 79 $ 50 Noncurrent pension liability (b) $ 77 $ — $ 45 $ — $ 45 $ 88 $ 110 $ — Net asset (liability) recognized $ 703 $ 393 $ 334 $ 229 $ 98 $ (30) $ (31) $ 50 Regulatory assets $ 1,910 $ 381 $ 691 $ 283 $ 408 $ 110 $ 209 $ 80 Accumulated other comprehensive (income) loss Deferred income tax benefit $ (21) $ — $ — $ — $ — $ — $ — $ — Prior service credit (2) — — — — — — — Net actuarial loss 100 — 2 — — — — — Net amounts recognized in accumulated other comprehensive loss $ 77 $ — $ 2 $ — $ — $ — $ — $ — (a) Included in Other within Other Noncurrent Assets on the Consolidated Balance Sheets. (b) Included in Accrued pension and other post-retirement benefit costs on the Consolidated Balance Sheets. Information for Plans with Accumulated Benefit Obligation in Excess of Plan Assets December 31, 2021 Duke Duke Energy Energy (in millions) Ohio Indiana Projected benefit obligation $ 153 $ 284 Accumulated benefit obligation 143 275 Fair value of plan assets 67 173 December 31, 2020 Duke Duke Duke Duke Progress Energy Energy Energy (in millions) Energy Energy Florida Ohio Indiana Projected benefit obligation $ 4,914 $ 828 $ 828 $ 184 $ 293 Accumulated benefit obligation 4,856 796 796 176 285 Fair value of plan assets 4,837 783 783 96 183 Assumptions Used for Pension Benefits Accounting The discount rate used to determine the current year pension obligation and following year’s pension expense is based on a bond selection-settlement portfolio approach. This approach develops a discount rate by selecting a portfolio of high-quality corporate bonds that generate sufficient cash flow to provide for projected benefit payments of the plan. The selected bond portfolio is derived from a universe of non-callable corporate bonds rated Aa quality or higher. After the bond portfolio is selected, a single interest rate is determined that equates the present value of the plan’s projected benefit payments discounted at this rate with the market value of the bonds selected. The average remaining service period for participants in active plans and life expectancy of participants in inactive plans is 14 years for Duke Energy, Duke Energy Progress and Duke Energy Ohio, 15 years for Progress Energy and Duke Energy Florida, 13 years for Duke Energy Carolinas and Duke Energy Indiana and nine years for Piedmont. The following tables present the assumptions or range of assumptions used for pension benefit accounting. December 31, 2021 2020 2019 Benefit Obligations Discount rate 2.90% 2.60% 3.30% Interest crediting rate 4.00% 4.00% 4.00% Salary increase 3.50 % – 4.00% 3.50 % – 4.00% 3.50 % – 4.00% Net Periodic Benefit Cost Discount rate 2.60% 3.30% 4.30% Interest crediting rate 4.00% 4.00% 4.00% Salary increase 3.50 % – 4.00% 3.50 % – 4.00% 3.50 % – 4.00% Expected long-term rate of return on plan assets 6.50% 6.85% 6.85% Expected Benefit Payments Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Years ending December 31, 2022 $ 652 $ 174 $ 177 $ 95 $ 81 $ 37 $ 48 $ 27 2023 653 173 180 97 82 36 48 24 2024 645 171 181 96 84 35 47 23 2025 632 168 180 94 85 34 47 20 2026 605 155 176 90 86 33 45 21 2027-2031 2,705 655 818 389 426 149 218 85 NON-QUALIFIED PENSION PLANS The accumulated benefit obligation, which equals the projected benefit obligation for non-qualified pension plans, was $300 million for Duke Energy, $12 million for Duke Energy Carolinas, $104 million for Progress Energy, $31 million for Duke Energy Progress, $41 million for Duke Energy Florida, $3 million for Duke Energy Ohio, $2 million for Duke Energy Indiana and $3 million for Piedmont as of December 31, 2021. Employer contributions, which equal benefits paid for non-qualified pension plans, were $24 million for Duke Energy, $1 million for Duke Energy Carolinas, $8 million for Progress Energy, $3 million for Duke Energy Progress and $3 million for Duke Energy Florida for the year ended December 31, 2021. Employer contributions were not material for Duke Energy Ohio, Duke Energy Indiana or Piedmont for the year ended December 31, 2021. Net periodic pension costs for non-qualified pension plans were not material for the years ended December 31, 2021, 2020 or 2019. OTHER POST-RETIREMENT BENEFIT PLANS Duke Energy provides, and the Subsidiary Registrants participate in, some health care and life insurance benefits for retired employees on a contributory and non-contributory basis. Employees are eligible for these benefits if they have met age and service requirements at retirement, as defined in the plans. The health care benefits include medical, dental, vision and prescription drug coverage and are subject to certain limitations, such as deductibles and copayments. Duke Energy did not make any pre-funding contributions to its other post-retirement benefit plans during the years ended December 31, 2021, 2020 or 2019. Components of Net Periodic Other Post-Retirement Benefit Costs Year Ended December 31, 2021 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Service cost $ 4 $ 1 $ 1 $ — $ — $ — $ 1 $ — Interest cost on accumulated post-retirement benefit obligation 18 4 7 4 3 1 1 1 Expected return on plan assets (11) (7) — — — — — (2) Amortization of actuarial loss 2 — 1 — 1 — 4 — Amortization of prior service credit (13) (4) (2) (1) (1) (1) (1) (2) Net periodic post-retirement benefit costs (a)(b) $ — $ (6) $ 7 $ 3 $ 3 $ — $ 5 $ (3) Year Ended December 31, 2020 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Service cost $ 4 $ 1 $ 1 $ — $ — $ — $ 1 $ — Interest cost on accumulated post-retirement benefit obligation 23 5 10 5 4 1 2 1 Expected return on plan assets (13) (8) — — — — — (2) Amortization of actuarial loss 2 — 1 — 1 — 4 — Amortization of prior service credit (14) (4) (3) (1) (2) (1) (1) (2) Net periodic post-retirement benefit costs (a)(b) $ 2 $ (6) $ 9 $ 4 $ 3 $ — $ 6 $ (3) Year Ended December 31, 2019 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Service cost $ 4 $ 1 $ 1 $ — $ 1 $ — $ 1 $ — Interest cost on accumulated post-retirement benefit obligation 30 7 12 7 5 1 3 1 Expected return on plan assets (12) (7) — — — — — (1) Amortization of actuarial loss 4 2 1 — 1 — 4 — Amortization of prior service credit (19) (5) (8) (1) (7) (1) (1) (2) Net periodic post-retirement benefit costs (a)(b) $ 7 $ (2) $ 6 $ 6 $ — $ — $ 7 $ (2) (a) Duke Energy amounts exclude $5 million, $6 million and $6 million for the years ended December 2021, 2020 and 2019, respectively, of regulatory asset amortization resulting from purchase accounting adjustments associated with Duke Energy's merger with Cinergy in April 2006. (b) Duke Energy Ohio amounts exclude $1 million, $1 million and $2 million for the years ended December 2021, 2020 and 2019, respectively, of regulatory asset amortization resulting from purchase accounting adjustments associated with Duke Energy's merger with Cinergy in April 2006. Amounts Recognized in Accumulated Other Comprehensive Income and Regulatory Assets and Liabilities Year Ended December 31, 2021 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Regulatory assets, net (decrease) increase $ (15) $ — $ (18) $ (9) $ (9) $ 4 $ (4) $ — Regulatory liabilities, net increase $ 23 $ 12 $ — $ — $ — $ 4 $ 1 $ 2 Accumulated other comprehensive (income) loss Amortization of prior year actuarial gain $ (1) $ — $ — $ — $ — $ — $ — $ — Net amount recognized in accumulated other comprehensive income $ (1) $ — $ — $ — $ — $ — $ — $ — Year Ended December 31, 2020 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Regulatory assets, net increase (decrease) $ 9 $ — $ 9 $ 6 $ 3 $ — $ (4) $ — Regulatory liabilities, net decrease $ (10) $ (7) $ — $ — $ — $ — $ (1) $ — Accumulated other comprehensive (income) loss Amortization of prior year service credit $ 1 $ — $ — $ — $ — $ — $ — $ — Net amount recognized in accumulated other comprehensive income $ 1 $ — $ — $ — $ — $ — $ — $ — Reconciliation of Funded Status to Accrued Other Post-Retirement Benefit Costs Year Ended December 31, 2021 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Change in Projected Benefit Obligation Accumulated post-retirement benefit obligation at prior measurement date $ 709 $ 174 $ 299 $ 166 $ 130 $ 27 $ 61 $ 30 Service cost 4 1 1 — — — 1 — Interest cost 18 4 7 4 3 1 1 1 Plan participants' contributions 14 3 5 3 2 1 2 — Actuarial gains (47) (14) (20) (10) (10) (1) (2) (2) Benefits paid (73) (19) (29) (16) (13) (3) (9) (2) Accumulated post-retirement benefit obligation at measurement date $ 625 $ 149 $ 263 $ 147 $ 112 $ 25 $ 54 $ 27 Change in Fair Value of Plan Assets Plan assets at prior measurement date $ 237 $ 139 $ (1) $ (2) $ (1) $ 9 $ 7 $ 37 Actual return on plan assets 15 9 — — — 1 — 3 Benefits paid (73) (19) (29) (16) (13) (3) (9) (2) Employer contributions 18 3 24 13 10 1 6 1 Plan participants' contributions 14 3 5 3 2 1 2 — Plan assets at measurement date $ 211 $ 135 $ (1) $ (2) $ (2) $ 9 $ 6 $ 39 Funded status of plan $ (414) $ (14) $ (264) $ (149) $ (114) $ (16) $ (48) $ 12 Year Ended December 31, 2020 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Change in Projected Benefit Obligation Accumulated post-retirement benefit obligation at prior measurement date $ 723 $ 175 $ 303 $ 168 $ 135 $ 29 $ 64 $ 30 Service cost 4 1 1 — — — 1 — Interest cost 23 5 10 5 4 1 2 1 Plan participants' contributions 15 3 5 3 2 1 2 — Actuarial losses 19 8 8 5 2 — 1 1 Benefits paid (75) (18) (28) (15) (13) (4) (9) (2) Accumulated post-retirement benefit obligation at measurement date $ 709 $ 174 $ 299 $ 166 $ 130 $ 27 $ 61 $ 30 Change in Fair Value of Plan Assets Plan assets at prior measurement date $ 220 $ 130 $ (1) $ (1) $ — $ 9 $ 5 $ 34 Actual return on plan assets 24 14 — — — — 1 4 Benefits paid (75) (18) (28) (15) (13) (4) (9) (2) Employer contributions 53 10 23 11 10 3 8 1 Plan participants' contributions 15 3 5 3 2 1 2 — Plan assets at measurement date $ 237 $ 139 $ (1) $ (2) $ (1) $ 9 $ 7 $ 37 Funded status of plan $ (472) $ (35) $ (300) $ (168) $ (131) $ (18) $ (54) $ 7 Amounts Recognized in the Consolidated Balance Sheets December 31, 2021 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Prefunded post-retirement benefit $ 12 $ — $ — $ — $ — $ 1 $ — $ 12 Current post-retirement liability (a) 9 — 5 3 2 1 — — Noncurrent post-retirement liability (b) 417 14 259 146 112 16 48 — Net liability (asset) recognized $ 414 $ 14 $ 264 $ 149 $ 114 $ 16 $ 48 $ (12) Regulatory assets $ 129 $ — $ 126 $ 79 $ 47 $ 4 $ 28 $ — Regulatory liabilities $ 162 $ 44 $ — $ — $ — $ 21 $ 63 $ 5 Accumulated other comprehensive (income) loss Deferred income tax expense $ 3 $ — $ — $ — $ — $ — $ — $ — Prior service credit (1) — — — — — — — Net actuarial gain (14) — — — — — — — Net amounts recognized in accumulated other comprehensive income $ (12) $ — $ — $ — $ — $ — $ — $ — December 31, 2020 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Prefunded post-retirement benefit $ 8 $ — $ — $ — $ — $ 1 $ — $ 7 Current post-retirement liability (a) 9 — 6 4 2 2 — — Noncurrent post-retirement liability (b) 471 35 294 164 129 17 54 — Net liability (asset) recognized $ 472 $ 35 $ 300 $ 168 $ 131 $ 18 $ 54 $ (7) Regulatory assets $ 144 $ — $ 144 $ 88 $ 56 $ — $ 32 $ — Regulatory liabilities $ 139 $ 32 $ — $ — $ — $ 17 $ 62 $ 3 Accumulated other comprehensive (income) loss Deferred income tax expense $ 3 $ — $ — $ — $ — $ — $ — $ — Prior service credit (1) — — — — — — — Net actuarial gain (13) — — — — — — — Net amounts recognized in accumulated other comprehensive income $ (11) $ — $ — $ — $ — $ — $ — $ — (a) Included in Other within Current Liabilities on the Consolidated Balance Sheets. (b) Included in Accrued pension and other post-retirement benefit costs on the Consolidated Balance Sheets. Assumptions Used for Other Post-Retirement Benefits Accounting The discount rate used to determine the current year other post-retirement benefits obligation and following year’s other post-retirement benefits expense is based on a bond selection-settlement portfolio approach. This approach develops a discount rate by selecting a portfolio of high-quality corporate bonds that generate sufficient cash flow to provide for projected benefit payments of the plan. The selected bond portfolio is derived from a universe of non-callable corporate bonds rated Aa quality or higher. After the bond portfolio is selected, a single interest rate is determined that equates the present value of the plan’s projected benefit payments discounted at this rate with the market value of the bonds selected. The average remaining service period of active covered employees is four years for Duke Energy, seven years for Duke Energy Florida, six years for Duke Energy Carolinas, Progress Energy, Duke Energy Progress, Duke Energy Indiana and Piedmont and five years for Duke Energy Ohio. The following tables present the assumptions used for other post-retirement benefits accounting. December 31, 2021 2020 2019 Benefit Obligations Discount rate 2.90 % 2.60 % 3.30 % Net Periodic Benefit Cost Discount rate 2.60 % 3.30 % 4.30 % Expected long-term rate of return on plan assets 6.50 % 6.85 % 6.85 % Assumed Health Care Cost Trend Rate December 31, 2021 2020 Health care cost trend rate assumed for next year 6.25 % 6.25 % Rate to which the cost trend is assumed to decline (the ultimate trend rate) 4.75 % 4.75 % Year that rate reaches ultimate trend 2028 2028 Expected Benefit Payments Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Years ending December 31, 2022 $ 70 $ 17 $ 26 $ 15 $ 12 $ 3 $ 7 $ 2 2023 62 15 25 14 11 3 6 2 2024 58 14 23 13 11 3 6 2 2025 54 13 22 12 10 2 5 2 2026 50 12 21 12 9 2 5 2 2027-2031 207 50 87 49 38 8 19 10 PLAN ASSETS Description and Allocations Duke Energy Master Retirement Trust Assets for both the qualified pension and other post-retirement benefits are maintained in the Duke Energy Master Retirement Trust. Approximately 98% of the Duke Energy Master Retirement Trust assets were allocated to qualified pension plans and approximately 2% were allocated to other post-retirement plans (comprised of 401(h) accounts), as of December 31, 2021, and 2020. The investment objective of the Duke Energy Master Retirement Trust is to invest in a diverse portfolio of assets that is expected to generate positive surplus return over time (i.e., asset growth greater than liability growth) subject to a prudent level of portfolio risk, for the purpose of enhancing the security of benefits for plan participants. As of December 31, 2021, Duke Energy assumes pension and other post-retirement plan assets will generate a long-term rate of return of 6.5%. The expected long-term rate of return was developed using a weighted average calculation of expected returns based primarily on future expected returns across asset classes considering the use of active asset managers, where applicable. The asset allocation targets were set after considering the investment objective and the risk profile. Equity securities are held for their higher expected returns. Debt securities are primarily held to hedge the qualified pension plan. Return seeking debt securities, hedge funds and other global securities are held for diversification. Investments within asset classes are diversified to achieve broad market participation and reduce the impact of individual managers or investments. Effective January 1, 2022, the target asset allocation for the Duke Energy Retirement Master Trust is 60% liability hedging assets and 40% return-seeking assets. Duke Energy periodically reviews its asset allocation targets, and over time, as the funded status of the benefit plans increase, the level of asset risk relative to plan liabilities may be reduced to better manage Duke Energy's benefit plan liabilities and reduce funded status volatility. The Duke Energy Master Retirement Trust is authorized to engage in the lending of certain plan assets. Securities lending is an investment management enhancement that utilizes certain existing securities of the Duke Energy Master Retirement Trust to earn additional income. Securities lending involves the loaning of securities to approved parties. In return for the loaned securities, the Duke Energy Master Retirement Trust receives collateral in the form of cash and securities as a safeguard against possible default of any borrower on the return of the loan under terms that permit the Duke Energy Master Retirement Trust to sell the securities. The Duke Energy Master Retirement Trust mitigates credit risk associated with securities lending arrangements by monitoring the fair value of the securities loaned, with additional collateral obtained or refunded as necessary. The fair value of securities on loan was approximately $542 million and $482 million at December 31, 2021, and 2020, respectively. Cash and securities obtained as collateral exceeded the fair value of the securities loaned at December 31, 2021, and 2020, respectively. Securities lending income earned by the Duke Energy Master Retirement Trust was immaterial for the years ended December 31, 2021, 2020 and 2019, respectively. Qualified pension and other post-retirement benefits for the Subsidiary Registrants are derived from the Duke Energy Master Retirement Trust, as such, each are allocated their proportionate share of the assets discussed below. The following table includes the target asset allocations by asset class at December 31, 2021, and the actual asset allocations for the Duke Energy Master Retirement Trust. Actual Allocation at Target December 31, Allocation 2021 2020 Global equity securities 27 % 24 % 30 % Global private equity securities 1 % 1 % 1 % Debt securities 62 % 62 % 55 % Return seeking debt securities 4 % 4 % 5 % Hedge funds 2 % 3 % 3 % Real estate and cash 4 % 6 % 6 % Total 100 % 100 % 100 % Other post-retirement assets Duke Energy's other post-retirement assets are comprised of Voluntary Employees' Beneficiary Association (VEBA) trusts and 401(h) accounts held within the Duke Energy Master Retirement Trust. Duke Energy's investment objective is to achieve sufficient returns, subject to a prudent level of portfolio risk, for the purpose of promoting the security of plan benefits for participants. The following table presents target and actual asset allocations for the VEBA trusts at December 31, 2021. Actual Allocation at Target December 31, Allocation 2021 2020 U.S. equity securities 30 % 19 % 36 % Non-U.S. equity securities 5 % 5 % 6 % Real estate 2 % 3 % 2 % Debt securities 45 % 18 % 42 % Cash 18 % 55 % 14 % Total 100 % 100 % 100 % Fair Value Measurements Duke Energy classifies recurring and non-recurring fair value measurements based on the fair value hierarchy as discussed in Note 16. Valuation methods of the primary fair value measurements disclosed below are as follows: Investments in equity securities Investments in equity securities are typically valued at the closing price in the principal active market as of the last business day of the reporting period. Principal active markets for equity prices include published exchanges such as NASDAQ and NYSE. Foreign equity prices are translated from their trading currency using the currency exchange rate in effect at the close of the principal active market. Prices have not been adjusted to reflect after-hours market activity. The majority of investments in equity securities are valued using Level 1 measurements. When the price of an institutional commingled fund is unpublished, it is not categorized in the fair value hierarchy, even though the funds are readily available at the fair value. Investments in corporate debt securities and U.S. government securities Most debt investments are valued based on a calculation using interest rate curves and credit spreads applied to the terms of the debt instrument (maturity and coupon interest rate) and consider the counterparty credit rating. Most debt valuations are Level 2 measurements. If the market for a particular fixed-income security is relatively inactive or illiquid, the measu

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2021
Income Tax Disclosure [Abstract]
Income Taxes	INCOME TAXES North Carolina's 2021 Appropriations Act On November 18, 2021, North Carolina Senate Bill 105 (SB 105) was signed into law by Governor Roy Cooper. Starting with tax year 2025, SB 105 begins phasing out the North Carolina corporate income tax rate over five years, from a statutory rate of 2.5% to zero. Duke Energy recorded a net reduction of approximately $490 million to its North Carolina deferred tax liability in the fourth quarter of 2021. The majority of this deferred tax liability reduction was offset by recording a regulatory liability pending NCUC determination of the disposition of the amounts related to Duke Energy Carolinas, Duke Energy Progress and Piedmont. In addition, Duke Energy recorded a net reduction of North Carolina consolidating deferred tax assets of approximately $25 million to deferred state income tax expense in the fourth quarter of 2021. North Carolina SB 105 did not have a significant impact on the financial position, results of operation, or cash flows of Duke Energy, Duke Energy Carolinas, Progress Energy, Duke Energy Progress or Piedmont. Consolidated Appropriations Act On December 27, 2020, the Consolidated Appropriations Act (CAA) was signed into law. In addition to the CAA providing funding for government operations, it also provided tax provisions to assist with COVID-19 relief, including extending certain expiring tax provisions. The company has reviewed the provisions of the CAA and has determined that there are no material impacts on the financial statements as a result of the CAA being signed into law. CARES Act On March 27, 2020, the CARES Act was enacted. The CARES Act is an emergency economic stimulus package in response to the COVID-19 pandemic. Among other provisions, the CARES Act accelerates the remaining AMT credit refund allowances resulting in taxpayers being able to immediately claim a refund in full for any AMT credit carryforwards and deferral of certain 2020 payroll taxes. In the third quarter of 2020, Duke Energy received $572 million related to these AMT credit carryforwards and $19 million of interest income. In addition, the company deferred approximately $117 million of payroll taxes, of which, 50% were paid by December 31, 2021, with the remaining 50% payable by December 31, 2022. The other provisions within the CARES Act do not materially impact Duke Energy's income tax accounting. Income Tax Expense Components of Income Tax Expense Year Ended December 31, 2021 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Current income taxes Federal $ (2) $ 241 $ (15) $ 113 $ (75) $ (8) $ 65 $ 23 State 2 23 (4) 8 (17) (2) 7 3 Foreign 2 — — — — — — — Total current income taxes 2 264 (19) 121 (92) (10) 72 26 Deferred income taxes Federal 199 (130) 203 (16) 202 35 19 17 State (1) (79) 47 (26) 77 5 16 (13) Total deferred income taxes (a) 198 (209) 250 (42) 279 40 35 4 ITC amortization (8) (4) (4) (4) — — — — Total income tax expense included in Consolidated Statements of Operations $ 192 $ 51 $ 227 $ 75 $ 187 $ 30 $ 107 $ 30 (a) Total deferred income taxes includes the generation of NOL carryforwards and tax credit carryforwards of $32 million at Duke Energy Carolinas, $8 million at Duke Energy Indiana, and $3 million at Piedmont. In addition, total deferred income taxes includes utilization of NOL carryforwards and tax credit carryforwards of $150 million at Duke Energy, $95 million at Progress Energy, $14 million at Duke Energy Progress, $64 million at Duke Energy Florida, and $2 million at Duke Energy Ohio. Year Ended December 31, 2020 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Current income taxes Federal $ (281) $ 314 $ 280 $ 181 $ 148 $ 10 $ 48 $ (27) State (9) 35 29 17 24 1 7 (8) Foreign 1 — — — — — — — Total current income taxes (289) 349 309 198 172 11 55 (35) Deferred income taxes Federal 155 (171) (167) (180) 1 30 12 60 State (92) (86) (24) (49) 25 2 17 (7) Total deferred income taxes (a) 63 (257) (191) (229) 26 32 29 53 ITC amortization (10) (4) (5) (5) — — — — Income tax (benefit) expense from continuing operations (236) 88 113 (36) 198 43 84 18 Tax expense from discontinued operations 2 — — — — — — — Total income tax (benefit) expense included in Consolidated Statements of Operations $ (234) $ 88 $ 113 $ (36) $ 198 $ 43 $ 84 $ 18 (a) Total deferred income taxes includes the generation of NOL carryforwards and tax credit carryforwards of $20 million at Duke Energy Carolinas, $3 million at Duke Energy Progress, $8 million at Duke Energy Indiana, and $11 million at Piedmont. In addition, total deferred income taxes includes utilization of NOL carryforwards and tax credit carryforwards of $39 million at Progress Energy, $30 million at Duke Energy Florida and $79 million at Duke Energy. Year Ended December 31, 2019 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Current income taxes Federal $ (299) $ 164 $ (173) $ (36) $ (43) $ (41) $ (23) $ (92) State 10 13 (7) (3) 18 (1) 1 (1) Foreign 2 — — — — — — — Total current income taxes (287) 177 (180) (39) (25) (42) (22) (93) Deferred income taxes Federal 855 175 422 220 153 77 128 133 State (38) (37) 17 (18) 27 5 28 3 Total deferred income taxes (a) 817 138 439 202 180 82 156 136 ITC amortization (11) (4) (6) (6) — — — — Income tax expense from continuing operations 519 311 253 157 155 40 134 43 Tax benefit from discontinued operations (2) — — — — — — — Total income tax expense included in Consolidated Statements of Operations $ 517 $ 311 $ 253 $ 157 $ 155 $ 40 $ 134 $ 43 (a) Total deferred income taxes includes the generation of tax credit carryforwards of $8 million at Duke Energy Carolinas. In addition, total deferred income taxes includes utilization of NOL carryforwards and tax credit carryforwards of $243 million at Progress Energy, $35 million at Duke Energy Progress, $152 million at Duke Energy Florida, $25 million at Duke Energy Ohio, $60 million at Duke Energy Indiana, $90 million at Piedmont and $775 million at Duke Energy. Duke Energy Income from Continuing Operations before Income Taxes Years Ended December 31, (in millions) 2021 2020 2019 Domestic $ 3,720 $ 826 $ 4,053 Foreign 44 13 44 Income from continuing operations before income taxes $ 3,764 $ 839 $ 4,097 Statutory Rate Reconciliation The following tables present a reconciliation of income tax expense at the U.S. federal statutory tax rate to the actual tax expense from continuing operations. Year Ended December 31, 2021 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Income tax expense, computed at the statutory rate of 21% $ 790 $ 291 $ 384 $ 224 $ 194 $ 49 $ 123 $ 71 State income tax, net of federal income tax effect 1 (44) 34 (14) 47 2 18 (8) Amortization of excess deferred income tax (438) (184) (174) (120) (54) (22) (34) (25) AFUDC equity income (34) (14) (11) (7) (3) (2) (4) (4) AFUDC equity depreciation 35 18 10 5 5 2 5 — Noncontrolling Interests 72 — — — — — — — Renewable energy PTCs (100) — — — — — — — Other tax credits (30) (12) (11) (8) (3) (1) (2) (4) Valuation Allowance (a) (85) — — — — — — — Other items, net (19) (4) (5) (5) 1 2 1 — Income tax expense from continuing operations $ 192 $ 51 $ 227 $ 75 $ 187 $ 30 $ 107 $ 30 Effective tax rate 5.1 % 3.7 % 12.4 % 7.0 % 20.2 % 12.8 % 18.2 % 8.8 % (a) In the fourth quarter of 2021, the company recognized a federal capital gain in the amount of $426 million. As a result, a valuation allowance of $85 million related to a federal capital loss carryforward was released. This valuation allowance was originally recorded as a result of the 2019 sale of minority interest of certain renewable assets within the Commercial Renewables segment. Year Ended December 31, 2020 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Income tax expense, computed at the statutory rate of 21% $ 176 $ 219 $ 243 $ 80 $ 204 $ 62 $ 103 $ 61 State income tax, net of federal income tax effect (80) (40) 4 (25) 39 2 19 (12) Amortization of excess deferred income tax (276) (82) (118) (68) (49) (20) (36) (21) AFUDC equity income (48) (13) (9) (6) (3) (2) (4) (10) AFUDC equity depreciation 103 19 10 5 5 1 4 — Noncontrolling Interests 62 — — — — — — — Renewable energy PTCs (110) — — — — — — — Other tax credits (37) (13) (16) (14) (2) (1) (3) (2) Tax true up (12) (3) 1 (5) 5 — (1) 1 Other items, net (14) 1 (2) (3) (1) 1 2 1 Income tax (benefit) expense from continuing operations $ (236) $ 88 $ 113 $ (36) $ 198 $ 43 $ 84 $ 18 Effective tax rate (28.1) % 8.4 % 9.7 % (9.5) % 20.4 % 14.6 % 17.1 % 6.2 % Year Ended December 31, 2019 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Income tax expense, computed at the statutory rate of 21% $ 860 $ 360 $ 332 $ 202 $ 178 $ 59 $ 120 $ 51 State income tax, net of federal income tax effect (22) (19) 8 (17) 35 3 22 2 Amortization of excess deferred income tax (121) (29) (64) (10) (54) (12) (6) (10) AFUDC equity income (52) (9) (14) (13) (1) (3) (3) — AFUDC equity depreciation 34 19 10 5 5 1 4 — Renewable energy PTCs (120) — — — — — — — Other tax credits (23) (11) (9) (7) (2) (1) (1) (1) Tax true up (64) (9) (8) (3) (5) (7) (1) — Other items, net 27 9 (2) — (1) — (1) 1 Income tax expense from continuing operations $ 519 $ 311 $ 253 $ 157 $ 155 $ 40 $ 134 $ 43 Effective tax rate 12.7 % 18.1 % 16.0 % 16.3 % 18.3 % 14.3 % 23.5 % 17.6 % Valuation allowances have been established for certain state NOL carryforwards and state income tax credits that reduce deferred tax assets to an amount that will be realized on a more-likely-than-not basis. The net change in the total valuation allowance is included in state income tax, net of federal income tax effect, in the above tables. DEFERRED TAXES Net Deferred Income Tax Liability Components December 31, 2021 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Deferred credits and other liabilities $ 347 $ 121 $ 101 $ 60 $ 40 $ 19 $ 7 $ 18 Lease obligations 346 91 197 121 76 4 16 4 Pension, post-retirement and other employee benefits 207 (36) 30 17 7 11 20 (8) Progress Energy merger purchase accounting adjustments (a) 340 — — — — — — — Tax credits and NOL carryforwards 3,784 349 497 160 306 13 195 29 Regulatory liabilities and deferred credits — 11 — — — 16 — 6 Investments and other assets — — — — — 5 6 — Other 85 12 12 7 4 7 2 8 Valuation allowance (518) — — — — — — — Total deferred income tax assets 4,591 548 837 365 433 75 246 57 Investments and other assets (2,428) (1,205) (742) (610) (135) — — (39) Accelerated depreciation rates (10,391) (2,977) (3,891) (1,546) (2,382) (1,125) (1,496) (833) Regulatory assets and deferred debits, net (1,151) — (768) (417) (350) — (53) — Total deferred income tax liabilities (13,970) (4,182) (5,401) (2,573) (2,867) (1,125) (1,549) (872) Net deferred income tax liabilities $ (9,379) $ (3,634) $ (4,564) $ (2,208) $ (2,434) $ (1,050) $ (1,303) $ (815) (a) Primarily related to lease obligations and debt fair value adjustments. The following table presents the expiration of tax credits and NOL carryforwards. December 31, 2021 (in millions) Amount Expiration Year General Business Credits $ 2,312 2024 — 2041 Federal NOL carryforwards (a) 4 2024 — 2026 State carryforwards and credits (b) (e) 328 2022 — Indefinite Foreign NOL carryforwards (c) 12 2027 — 2037 Foreign Tax Credits (d) 1,128 2024 — 2027 Total tax credits and NOL carryforwards $ 3,784 (a) A valuation allowance of $4 million has been recorded on the Federal NOL carryforwards, as presented in the Net Deferred Income Tax Liability Components table. (b) A valuation allowance of $112 million has been recorded on the state NOL and attribute carryforwards, as presented in the Net Deferred Income Tax Liability Components table. (c) A valuation allowance of $12 million has been recorded on the foreign NOL carryforwards, as presented in the Net Deferred Income Tax Liability Components table. (d) A valuation allowance of $390 million has been recorded on the foreign tax credits, as presented in the Net Deferred Income Tax Liability Components table. (e) Indefinite carryforward for Federal NOLs, and NOLs for states that have adopted the Tax Act's NOL provisions, generated in tax years beginning after December 31, 2017. December 31, 2020 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Deferred credits and other liabilities $ 286 $ 85 $ 87 $ 67 $ 18 $ 21 $ 7 $ 38 Lease obligations 515 96 208 120 87 5 16 5 Pension, post-retirement and other employee benefits 236 (30) 68 24 38 16 26 (5) Progress Energy merger purchase accounting adjustments (a) 441 — — — — — — — Tax credits and NOL carryforwards 3,909 285 508 179 282 16 183 29 Regulatory liabilities and deferred credits — 11 — — — 18 — — Investments and other assets — — — — — 7 — Other 93 8 14 9 4 7 1 8 Valuation allowance (586) — — — — — — — Total deferred income tax assets 4,894 455 885 399 429 90 233 75 Investments and other assets (2,267) (1,127) (669) (507) (164) — (14) (48) Accelerated depreciation rates (10,729) (3,170) (3,868) (1,778) (2,124) (1,071) (1,433) (844) Regulatory assets and deferred debits, net (1,142) — (744) (412) (332) — (14) (4) Total deferred income tax liabilities (14,138) (4,297) (5,281) (2,697) (2,620) (1,071) (1,461) (896) Net deferred income tax liabilities $ (9,244) $ (3,842) $ (4,396) $ (2,298) $ (2,191) $ (981) $ (1,228) $ (821) (a) Primarily related to lease obligations and debt fair value adjustments. UNRECOGNIZED TAX BENEFITS The following tables present changes to unrecognized tax benefits. Year Ended December 31, 2021 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Unrecognized tax benefits – January 1 $ 125 $ 10 $ 10 $ 6 $ 3 $ 1 $ 1 $ 1 Gross decreases – tax positions in prior periods (a) (86) — — — — — — — Gross increases – current period tax positions 12 3 5 4 1 — 1 3 Total changes (74) 3 5 4 1 — 1 3 Unrecognized tax benefits – December 31 $ 51 $ 13 $ 15 $ 10 $ 4 $ 1 $ 2 $ 4 (a) In the fourth quarter of 2021, the company recognized a federal capital gain in the amount of $426 million. As a result of the capital gain, a previously recorded unrecognized tax benefit related to the character of a taxable loss has been reversed. See note (a) under the Statutory Rate Reconciliation table for more details. Year Ended December 31, 2020 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Unrecognized tax benefits – January 1 $ 126 $ 8 $ 9 $ 6 $ 3 $ 1 $ 1 $ 4 Gross decreases – tax positions in prior periods (2) — — — — — — — Gross increases – current period tax positions 4 2 1 — — — — — Reduction due to lapse of statute of limitations (3) — — — — — — (3) Total changes (1) 2 1 — — — — (3) Unrecognized tax benefits – December 31 $ 125 $ 10 $ 10 $ 6 $ 3 $ 1 $ 1 $ 1 Year Ended December 31, 2019 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Unrecognized tax benefits – January 1 $ 24 $ 6 $ 9 $ 6 $ 3 $ 1 $ 1 $ 4 Unrecognized tax benefits increases 105 2 1 1 — — — — Gross decreases – tax positions in prior periods (3) — (1) (1) — — — — Total changes 102 2 — — — — — — Unrecognized tax benefits – December 31 $ 126 $ 8 $ 9 $ 6 $ 3 $ 1 $ 1 $ 4 The following table includes additional information regarding the Duke Energy Registrants' unrecognized tax benefits at December 31, 2021. Duke Energy Registrants do not anticipate a material increase or decrease in unrecognized tax benefits within the next 12 months. December 31, 2021 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Amount that if recognized, would affect the effective tax rate or regulatory liability (a) $ 47 $ 13 $ 14 $ 10 $ 4 $ 1 $ 2 $ 4 (a) The Duke Energy Registrants are unable to estimate the specific amounts that would affect the ETR versus the regulatory liability. Duke Energy and its subsidiaries are no longer subject to federal, state, local or non-U.S. income tax examinations by tax authorities for years before 2016, aside from certain state tax attributes carried forward for utilization in future years.

Other Income and Expenses, Net

Other Income and Expenses, Net	12 Months Ended
	Dec. 31, 2021
Other Income and Expenses [Abstract]
Other Income and Expenses, Net	OTHER INCOME AND EXPENSES, NET The components of Other income and expenses, net on the Consolidated Statements of Operations are as follows. Year Ended December 31, 2021 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Interest income $ 16 $ 4 $ 8 $ 6 $ 2 $ 4 $ 6 $ 19 AFUDC equity 171 65 51 34 16 7 27 20 Post in-service equity returns 39 21 16 16 — 1 1 — Nonoperating income, other 417 180 140 87 53 6 8 16 Other income and expense, net $ 643 $ 270 $ 215 $ 143 $ 71 $ 18 $ 42 $ 55 Year Ended December 31, 2020 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Interest income $ 32 $ 4 $ 8 $ 2 $ 6 $ 4 $ 6 $ 17 AFUDC equity 154 62 42 29 12 7 23 19 Post in-service equity returns 27 17 8 8 — 1 1 — Nonoperating income, other 240 94 71 36 35 4 7 15 Other income and expense, net $ 453 $ 177 $ 129 $ 75 $ 53 $ 16 $ 37 $ 51 Year Ended December 31, 2019 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Interest income $ 31 $ 1 $ 11 $ — $ 11 $ 10 $ 10 $ 1 AFUDC equity 139 42 66 60 6 13 18 — Post in-service equity returns 29 20 7 7 — 1 — — Nonoperating income, other 231 88 57 33 31 — 13 19 Other income and expense, net $ 430 $ 151 $ 141 $ 100 $ 48 $ 24 $ 41 $ 20

Subsequent Events

Subsequent Events	12 Months Ended
	Dec. 31, 2021
Subsequent Events [Abstract]
Subsequent Events	SUBSEQUENT EVENTSFor information on subsequent events related to regulatory matters and commitments and contingencies, see Notes 3 and 4, respectively.

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policy)	12 Months Ended
	Dec. 31, 2021
Accounting Policies [Abstract]
Nature of Operations and Basis of Consolidation	Nature of Operations and Basis of Consolidation Duke Energy is an energy company headquartered in Charlotte, North Carolina, subject to regulation by the FERC and other regulatory agencies listed below. Duke Energy operates in the U.S. primarily through its direct and indirect subsidiaries. Certain Duke Energy subsidiaries are also subsidiary registrants, including Duke Energy Carolinas; Progress Energy; Duke Energy Progress; Duke Energy Florida; Duke Energy Ohio; Duke Energy Indiana and Piedmont. When discussing Duke Energy’s consolidated financial information, it necessarily includes the results of its separate Subsidiary Registrants, which along with Duke Energy, are collectively referred to as the Duke Energy Registrants. The information in these combined notes relates to each of the Duke Energy Registrants as noted in the Index to Combined Notes to Consolidated Financial Statements. However, none of the Subsidiary Registrants make any representation as to information related solely to Duke Energy or the Subsidiary Registrants of Duke Energy other than itself. These Consolidated Financial Statements include, after eliminating intercompany transactions and balances, the accounts of the Duke Energy Registrants and subsidiaries or VIEs where the respective Duke Energy Registrants have control. See Note 17 for additional information on VIEs. These Consolidated Financial Statements also reflect the Duke Energy Registrants’ proportionate share of certain jointly owned generation and transmission facilities. See Note 8 for additional information on joint ownership. Substantially all of the Subsidiary Registrants' operations qualify for regulatory accounting. Duke Energy Carolinas is a regulated public utility primarily engaged in the generation, transmission, distribution and sale of electricity in portions of North Carolina and South Carolina. Duke Energy Carolinas is subject to the regulatory provisions of the NCUC, PSCSC, NRC and FERC. Progress Energy is a public utility holding company, which conducts operations through its wholly owned subsidiaries, Duke Energy Progress and Duke Energy Florida. Progress Energy is subject to regulation by FERC and other regulatory agencies listed below. Duke Energy Progress is a regulated public utility primarily engaged in the generation, transmission, distribution and sale of electricity in portions of North Carolina and South Carolina. Duke Energy Progress is subject to the regulatory provisions of the NCUC, PSCSC, NRC and FERC. Duke Energy Florida is a regulated public utility primarily engaged in the generation, transmission, distribution and sale of electricity in portions of Florida. Duke Energy Florida is subject to the regulatory provisions of the FPSC, NRC and FERC. Duke Energy Ohio is a regulated public utility primarily engaged in the transmission and distribution of electricity in portions of Ohio and Kentucky, the generation and sale of electricity in portions of Kentucky and the transportation and sale of natural gas in portions of Ohio and Kentucky. Duke Energy Ohio conducts competitive auctions for retail electricity supply in Ohio whereby the energy price is recovered from retail customers and recorded in Operating Revenues on the Consolidated Statements of Operations and Comprehensive Income. Operations in Kentucky are conducted through its wholly owned subsidiary, Duke Energy Kentucky. References herein to Duke Energy Ohio collectively include Duke Energy Ohio and its subsidiaries, unless otherwise noted. Duke Energy Ohio is subject to the regulatory provisions of the PUCO, KPSC and FERC. Duke Energy Indiana is a regulated public utility primarily engaged in the generation, transmission, distribution and sale of electricity in portions of Indiana. Duke Energy Indiana is subject to the regulatory provisions of the IURC and FERC. Piedmont is a regulated public utility primarily engaged in the distribution of natural gas in portions of North Carolina, South Carolina and Tennessee. Piedmont is subject to the regulatory provisions of the NCUC, PSCSC, TPUC and FERC. Certain prior year amounts have been reclassified to conform to the current year presentation.
Discontinued Operations	Discontinued OperationsDuke Energy has elected to present cash flows of discontinued operations combined with cash flows of continuing operations. Unless otherwise noted, the notes to these consolidated financial statements exclude amounts related to discontinued operations for all periods presented. For the years ended December 31, 2021, 2020 and 2019, the Income (Loss) From Discontinued Operations, net of tax on Duke Energy's Consolidated Statements of Operations is entirely attributable to controlling interest.
Noncontrolling Interest	Noncontrolling Interest Duke Energy maintains a controlling financial interest in certain less than wholly owned nonregulated subsidiaries. As a result, Duke Energy consolidates these subsidiaries and presents the third-party investors' portion of Duke Energy's net income (loss), net assets and comprehensive income (loss) as noncontrolling interest. Noncontrolling interest is included as a component of equity on the Consolidated Balance Sheet. Several operating agreements of Duke Energy's subsidiaries with noncontrolling interest are subject to allocations of tax attributes and cash flows in accordance with contractual agreements that vary throughout the lives of the subsidiaries. Therefore, Duke Energy and the other investors' (the owners) interests in the subsidiaries are not fixed, and the subsidiaries apply the HLBV method in allocating income or loss and other comprehensive income or loss (all measured on a pretax basis) to the owners. The HLBV method measures the amounts that each owner would hypothetically claim at each balance sheet reporting date, including tax benefits realized by the owners, most of which is over the IRS recapture period, upon a hypothetical liquidation of the subsidiary at the net book value of its underlying assets. The change in the amount that each owner would hypothetically receive at the reporting date compared to the amount it would have received on the previous reporting date represents the amount of income or loss allocated to each owner for the reporting period. Other operating agreements of Duke Energy's subsidiaries with noncontrolling interest allocate profit and loss based on their pro rata shares of the ownership interest in the respective subsidiary. Therefore, Duke Energy allocates net income or loss and other comprehensive income or loss of these subsidiaries to the owners based on their pro rata shares.
Acquisitions	Acquisitions The Duke Energy Registrants consolidate assets and liabilities from acquisitions as of the purchase date and include earnings from acquisitions in consolidated earnings after the purchase date.
Use of Estimates	Use of Estimates In preparing financial statements that conform to GAAP, the Duke Energy Registrants must make estimates and assumptions that affect the reported amounts of assets and liabilities, the reported amounts of revenues and expenses and the disclosure of contingent assets and liabilities at the date of the financial statements. Actual results could differ from those estimates.
Regulatory Accounting	Regulatory Accounting The majority of the Duke Energy Registrants’ operations are subject to price regulation for the sale of electricity and natural gas by state utility commissions or FERC. When prices are set on the basis of specific costs of the regulated operations and an effective franchise is in place such that sufficient natural gas or electric services can be sold to recover those costs, the Duke Energy Registrants apply regulatory accounting. Regulatory accounting changes the timing of the recognition of costs or revenues relative to a company that does not apply regulatory accounting. As a result, regulatory assets and regulatory liabilities are recognized on the Consolidated Balance Sheets. Regulatory assets and liabilities are amortized consistent with the treatment of the related cost in the ratemaking process. Regulatory assets are reviewed for recoverability each reporting period. If a regulatory asset is no longer deemed probable of recovery, the deferred cost is charged to earnings. See Note 3 for further information. Regulatory accounting rules also require recognition of a disallowance (also called "impairment") loss if it becomes probable that part of the cost of a plant under construction (or a recently completed plant or an abandoned plant) will be disallowed for ratemaking purposes and a reasonable estimate of the amount of the disallowance can be made. For example, if a cost cap is set for a plant still under construction, the amount of the disallowance is a result of a judgment as to the ultimate cost of the plant. These disallowances can require judgments on allowed future rate recovery. When it becomes probable that regulated generation, transmission or distribution assets will be abandoned, the cost of the asset is removed from plant in service. The value that may be retained as a regulatory asset on the balance sheet for the abandoned property is dependent upon amounts that may be recovered through regulated rates, including any return. As such, an impairment charge could be partially or fully offset by the establishment of a regulatory asset if rate recovery is probable. The impairment charge for a disallowance of costs for regulated plants under construction, recently completed or abandoned is based on discounted cash flows.
Regulated Fuel Costs and Purchased Power	The Duke Energy Registrants utilize cost-tracking mechanisms, commonly referred to as fuel adjustment clauses or PGA clauses. These clauses allow for the recovery of fuel and fuel-related costs, portions of purchased power, natural gas costs and hedging costs through surcharges on customer rates. The difference between the costs incurred and the surcharge revenues is recorded either as an adjustment to Operating Revenues, Operating Expenses – Fuel used in electric generation or Operating Expenses – Cost of natural gas on the Consolidated Statements of Operations, with an off-setting impact on regulatory assets or liabilities
Cash, Cash Equivalents and Restricted Cash	Cash, Cash Equivalents and Restricted CashAll highly liquid investments with maturities of three months or less at the date of acquisition are considered cash equivalents. Duke Energy, Progress Energy and Duke Energy Florida have restricted cash balances related primarily to collateral assets, escrow deposits and VIEs. Duke Energy Carolinas and Duke Energy Progress have restricted cash balances related to VIEs from storm recovery bonds issued in 2021. See Note 17 for additional information. Restricted cash amounts are included in Other within Current Assets and Other Noncurrent Assets on the Consolidated Balance Sheets.
Inventory	InventoryInventory related to regulated operations is valued at historical cost. Inventory related to nonregulated operations is valued at the lower of cost or market. Inventory is charged to expense or capitalized to property, plant and equipment when issued, primarily using the average cost method. Excess or obsolete inventory is written down to the lower of cost or net realizable value. Once inventory has been written down, it creates a new cost basis for the inventory that is not subsequently written up. Provisions for inventory write-offs were not material at December 31, 2021, and 2020, respectively.
Investments in Debt and Equity Securities	Investments in Debt and Equity SecuritiesThe Duke Energy Registrants classify investments in equity securities as FV-NI and investments in debt securities as AFS. Both categories are recorded at fair value on the Consolidated Balance Sheets. Realized and unrealized gains and losses on securities classified as FV-NI are reported through net income. Unrealized gains and losses for debt securities classified as AFS are included in AOCI until realized, unless it is determined the carrying value of an investment has a credit loss. For certain investments of regulated operations, such as substantially all of the NDTF, realized and unrealized gains and losses (including any credit losses) on debt securities are recorded as a regulatory asset or liability. The credit loss portion of debt securities of nonregulated operations are included in earnings. Investments in debt and equity securities are classified as either current or noncurrent based on management’s intent and ability to sell these securities, taking into consideration current market liquidity.
Goodwill and Intangible Assets	Goodwill Duke Energy, Progress Energy, Duke Energy Ohio and Piedmont perform annual goodwill impairment tests as of August 31 each year at the reporting unit level, which is determined to be a business segment or one level below. Duke Energy, Progress Energy, Duke Energy Ohio and Piedmont update these tests between annual tests if events or circumstances occur that would more likely than not reduce the fair value of a reporting unit below its carrying value. See Note 11 for further information. Intangible Assets Intangible assets are included in Other in Other Noncurrent Assets on the Consolidated Balance Sheets. Generally, intangible assets are amortized using an amortization method that reflects the pattern in which the economic benefits of the intangible asset are consumed or on a straight-line basis if that pattern is not readily determinable. Amortization of intangibles is reflected in Depreciation and amortization on the Consolidated Statements of Operations. Intangible assets are subject to impairment testing and if impaired, the carrying value is accordingly reduced.
Long-Lived Asset Impairments	Long-Lived Asset Impairments The Duke Energy Registrants evaluate long-lived assets, excluding goodwill, for impairment when circumstances indicate the carrying value of those assets may not be recoverable. An impairment exists when a long-lived asset’s carrying value exceeds the estimated undiscounted cash flows expected to result from the use and eventual disposition of the asset. The estimated cash flows may be based on alternative expected outcomes that are probability weighted. If the carrying value of the long-lived asset is not recoverable based on these estimated future undiscounted cash flows, the carrying value of the asset is written down to its then current estimated fair value and an impairment charge is recognized. The Duke Energy Registrants assess fair value of long-lived assets using various methods, including recent comparable third-party sales, internally developed discounted cash flow analysis and analysis from outside advisors. Triggering events to reassess cash flows may include, but are not limited to, significant changes in commodity prices, the condition of an asset or management’s interest in selling the asset.
Equity Method Investment Impairments	Equity Method Investment Impairments Investments in affiliates that are not controlled by Duke Energy, but over which it has significant influence, are accounted for using the equity method. Equity method investments are assessed for impairment whenever events or changes in circumstances indicate that the carrying amount of the investment may not be recoverable. If the decline in value is considered to be other than temporary, the investment is written down to its estimated fair value, which establishes a new cost basis in the investment. Impairment assessments use a discounted cash flow income approach and include consideration of the severity and duration of any decline in the fair value of the investments. The estimated cash flows may be based on alternative expected outcomes that are probability weighted. Key inputs that involve estimates and significant management judgment include cash flow projections, selection of a discount rate, probability weighting of potential outcomes, and whether any decline in value is considered temporary.
Property, Plant and Equipment	Property, Plant and Equipment Property, plant and equipment are stated at the lower of depreciated historical cost net of any disallowances or fair value, if impaired. The Duke Energy Registrants capitalize all construction-related direct labor and material costs, as well as indirect construction costs such as general engineering, taxes and financing costs. See “Allowance for Funds Used During Construction and Interest Capitalized” section below for information on capitalized financing costs. Costs of renewals and betterments that extend the useful life of property, plant and equipment are also capitalized. The cost of repairs, replacements and major maintenance projects, which do not extend the useful life or increase the expected output of the asset, are expensed as incurred. Depreciation is generally computed over the estimated useful life of the asset using the composite straight-line method. Depreciation studies are conducted periodically to update composite rates and are approved by state utility commissions and/or the FERC when required. The composite weighted average depreciation rates, excluding nuclear fuel, are included in the table that follows. Years Ended December 31, 2021 2020 2019 Duke Energy 2.9 % 3.0 % 3.1 % Duke Energy Carolinas 2.7 % 2.8 % 2.8 % Progress Energy 3.1 % 3.2 % 3.1 % Duke Energy Progress 3.0 % 3.1 % 3.1 % Duke Energy Florida 3.3 % 3.3 % 3.1 % Duke Energy Ohio 2.9 % 2.9 % 2.6 % Duke Energy Indiana 3.6 % 3.5 % 3.3 % Piedmont 2.1 % 2.3 % 2.4 % In general, when the Duke Energy Registrants retire regulated property, plant and equipment, the original cost plus the cost of retirement, less salvage value and any depreciation already recognized, is charged to accumulated depreciation. However, when it becomes probable the asset will be retired substantially in advance of its original expected useful life or is abandoned, the cost of the asset and the corresponding accumulated depreciation is recognized as a separate asset. If the asset is still in operation, the net amount is classified as Facilities to be retired, net on the Consolidated Balance Sheets. If the asset is no longer operating, the net amount is classified in Regulatory assets on the Consolidated Balance Sheets if deemed recoverable (see discussion of long-lived asset impairments above). The carrying value of the asset is based on historical cost if the Duke Energy Registrants are allowed to recover the remaining net book value and a return equal to at least the incremental borrowing rate. If not, an impairment is recognized to the extent the net book value of the asset exceeds the present value of future revenues discounted at the incremental borrowing rate. When the Duke Energy Registrants sell entire regulated operating units, or retire or sell nonregulated properties, the original cost and accumulated depreciation and amortization balances are removed from Property, Plant and Equipment on the Consolidated Balance Sheets. Any gain or loss is recorded in earnings, unless otherwise required by the applicable regulatory body. See Note 10 for additional information.
Leases	Leases Duke Energy determines if an arrangement is a lease at contract inception based on whether the arrangement involves the use of a physically distinct identified asset and whether Duke Energy has the right to obtain substantially all of the economic benefits from the use of the asset throughout the period as well as the right to direct the use of the asset. As a policy election, Duke Energy does not evaluate arrangements with initial contract terms of less than one year as leases. Operating leases are included in Operating lease ROU assets, net, Other current liabilities and Operating lease liabilities on the Consolidated Balance Sheets. Finance leases are included in Property, plant and equipment, Current maturities of long-term debt and Long-Term Debt on the Consolidated Balance Sheets. For lessee and lessor arrangements, Duke Energy has elected a policy to not separate lease and non-lease components for all asset classes. For lessor arrangements, lease and non-lease components are only combined under one arrangement and accounted for under the lease accounting framework if the non-lease components are not the predominant component of the arrangement and the lease component would be classified as an operating lease.
Leases	Leases Duke Energy determines if an arrangement is a lease at contract inception based on whether the arrangement involves the use of a physically distinct identified asset and whether Duke Energy has the right to obtain substantially all of the economic benefits from the use of the asset throughout the period as well as the right to direct the use of the asset. As a policy election, Duke Energy does not evaluate arrangements with initial contract terms of less than one year as leases. Operating leases are included in Operating lease ROU assets, net, Other current liabilities and Operating lease liabilities on the Consolidated Balance Sheets. Finance leases are included in Property, plant and equipment, Current maturities of long-term debt and Long-Term Debt on the Consolidated Balance Sheets. For lessee and lessor arrangements, Duke Energy has elected a policy to not separate lease and non-lease components for all asset classes. For lessor arrangements, lease and non-lease components are only combined under one arrangement and accounted for under the lease accounting framework if the non-lease components are not the predominant component of the arrangement and the lease component would be classified as an operating lease.
Nuclear Fuel	Nuclear Fuel Nuclear fuel is classified as Property, Plant and Equipment on the Consolidated Balance Sheets. Nuclear fuel in the front-end fuel processing phase is considered work in progress and not amortized until placed in service. Amortization of nuclear fuel is included within Fuel used in electric generation and purchased power on the Consolidated Statements of Operations. Amortization is recorded using the units-of-production method.
Allowance for Funds Used During Construction and Interest Capitalized	Allowance for Funds Used During Construction and Interest Capitalized For regulated operations, the debt and equity costs of financing the construction of property, plant and equipment are reflected as AFUDC and capitalized as a component of the cost of property, plant and equipment. AFUDC equity is reported on the Consolidated Statements of Operations as non-cash income in Other income and expenses, net. AFUDC debt is reported as a non-cash offset to Interest Expense. After construction is completed, the Duke Energy Registrants are permitted to recover these costs through their inclusion in rate base and the corresponding subsequent depreciation or amortization of those regulated assets. AFUDC equity, a permanent difference for income taxes, reduces the ETR when capitalized and increases the ETR when depreciated or amortized. See Note 23 for additional information.
Asset Retirement Obligations	Asset Retirement Obligations AROs are recognized for legal obligations associated with the retirement of property, plant and equipment. Substantially all AROs are related to regulated operations. When recording an ARO, the present value of the projected liability is recognized in the period in which it is incurred, if a reasonable estimate of fair value can be made. The liability is accreted over time. For operating plants, the present value of the liability is added to the cost of the associated asset and depreciated over the remaining life of the asset. For retired plants, the present value of the liability is recorded as a regulatory asset unless determined not to be probable of recovery. The present value of the initial obligation and subsequent updates are based on discounted cash flows, which include estimates regarding timing of future cash flows, selection of discount rates and cost escalation rates, among other factors. These estimates are subject to change. Depreciation expense is adjusted prospectively for any changes to the carrying amount of the associated asset. The Duke Energy Registrants receive amounts to fund the cost of the ARO for regulated operations through a combination of regulated revenues and earnings on the NDTF. As a result, amounts recovered in regulated revenues, earnings on the NDTF, accretion expense and depreciation of the associated asset are netted and deferred as a regulatory asset or liability.
Accounts Payable	Accounts PayableDuring 2020, Duke Energy established a supply chain finance program (the “program”) with a global financial institution. The program is voluntary and allows Duke Energy suppliers, at their sole discretion, to sell their receivables from Duke Energy to the financial institution at a rate that leverages Duke Energy’s credit rating and, which may result in favorable terms compared to the rate available to the supplier on their own credit rating. Suppliers participating in the program, determine at their sole discretion which invoices they will sell to the financial institution. Suppliers’ decisions on which invoices are sold do not impact Duke Energy’s payment terms, which are based on commercial terms negotiated between Duke Energy and the supplier regardless of program participation. The commercial terms negotiated between Duke Energy and its suppliers are consistent regardless of whether the supplier elects to participate in the program. Duke Energy does not issue any guarantees with respect to the program and does not participate in negotiations between suppliers and the financial institution. Duke Energy does not have an economic interest in the supplier’s decision to participate in the program and receives no interest, fees or other benefit from the financial institution based on supplier participation in the program.
Revenue Recognition	Revenue Recognition Duke Energy recognizes revenue as customers obtain control of promised goods and services in an amount that reflects consideration expected in exchange for those goods or services. Generally, the delivery of electricity and natural gas results in the transfer of control to customers at the time the commodity is delivered and the amount of revenue recognized is equal to the amount billed to each customer, including estimated volumes delivered when billings have not yet occurred. See Note 18 for further information.
Derivatives and Hedging	Derivatives and Hedging Derivative and non-derivative instruments may be used in connection with commodity price and interest rate activities, including swaps, futures, forwards and options. All derivative instruments, except those that qualify for the NPNS exception, are recorded on the Consolidated Balance Sheets at fair value. Qualifying derivative instruments may be designated as either cash flow hedges or fair value hedges. Other derivative instruments (undesignated contracts) either have not been designated or do not qualify as hedges. The effective portion of the change in the fair value of cash flow hedges is recorded in AOCI. The effective portion of the change in the fair value of a fair value hedge is offset in net income by changes in the hedged item. For activity subject to regulatory accounting, gains and losses on derivative contracts are reflected as regulatory assets or liabilities and not as other comprehensive income or current period income. As a result, changes in fair value of these derivatives have no immediate earnings impact. Formal documentation, including transaction type and risk management strategy, is maintained for all contracts accounted for as a hedge. At inception and at least every three months thereafter, the hedge contract is assessed to see if it is highly effective in offsetting changes in cash flows or fair values of hedged items.
Captive Insurance Reserves	Captive Insurance Reserves Duke Energy has captive insurance subsidiaries that provide coverage, on an indemnity basis, to the Subsidiary Registrants as well as certain third parties, on a limited basis, for financial losses, primarily related to property, workers’ compensation and general liability. Liabilities include provisions for estimated losses incurred but not reported (IBNR), as well as estimated provisions for known claims. IBNR reserve estimates are primarily based upon historical loss experience, industry data and other actuarial assumptions. Reserve estimates are adjusted in future periods as actual losses differ from experience.
Unamortized Debt Premium, Discount and Expense	Unamortized Debt Premium, Discount and Expense Premiums, discounts and expenses incurred with the issuance of outstanding long-term debt are amortized over the term of the debt issue. The gain or loss on extinguishment associated with refinancing higher-cost debt obligations in the regulated operations is amortized over the remaining life of the original instrument. Amortization expense is recorded as Interest Expense in the Consolidated Statements of Operations and is reflected as Depreciation, amortization and accretion within Net cash provided by operating activities on the Consolidated Statements of Cash Flows. Premiums, discounts and expenses are presented as an adjustment to the carrying value of the debt amount and included in Long-Term Debt on the Consolidated Balance Sheets presented.
Preferred Stock	Preferred Stock Preferred stock is reviewed to determine the appropriate balance sheet classification and embedded features, such as call options, are evaluated to determine if they should be bifurcated and accounted for separately. Costs directly related to the issuance of preferred stock are recorded as a reduction of the proceeds received. The liability for the dividend is recognized when declared. The accumulated dividends on the cumulative preferred stock is recognized to net income available to Duke Energy Corporation in the EPS calculation. See Note 19 for further information.
Loss Contingencies and Environmental Liabilities	Loss Contingencies and Environmental Liabilities Contingent losses are recorded when it is probable a loss has occurred and the loss can be reasonably estimated. When a range of the probable loss exists and no amount within the range is a better estimate than any other amount, the minimum amount in the range is recorded. Unless otherwise required by GAAP, legal fees are expensed as incurred. Environmental liabilities are recorded on an undiscounted basis when environmental remediation or other liabilities become probable and can be reasonably estimated. Environmental expenditures related to past operations that do not generate current or future revenues are expensed. Environmental expenditures related to operations that generate current or future revenues are expensed or capitalized, as appropriate. Certain environmental expenditures receive regulatory accounting treatment and are recorded as regulatory assets.
Pension and Other Post-Retirement Benefit Plans	Pension and Other Post-Retirement Benefit PlansDuke Energy maintains qualified, non-qualified and other post-retirement benefit plans. Eligible employees of the Subsidiary Registrants participate in the respective qualified, non-qualified and other post-retirement benefit plans and the Subsidiary Registrants are allocated their proportionate share of benefit costs.
Severance and Special Termination Benefits	Severance and Special Termination BenefitsDuke Energy has severance plans under which in general, the longer a terminated employee worked prior to termination the greater the amount of severance benefits. A liability for involuntary severance is recorded once an involuntary severance plan is committed to by management if involuntary severances are probable and can be reasonably estimated. For involuntary severance benefits incremental to its ongoing severance plan benefits, the fair value of the obligation is expensed at the communication date if there are no future service requirements or over the required future service period. Duke Energy also offers special termination benefits under voluntary severance programs. Special termination benefits are recorded immediately upon employee acceptance absent a significant retention period. Otherwise, the cost is recorded over the remaining service period. Employee acceptance of voluntary severance benefits is determined by management based on the facts and circumstances of the benefits being offered.
Guarantees	GuaranteesIf necessary, liabilities are recognized at the time of issuance or material modification of a guarantee for the estimated fair value of the obligation it assumes. Fair value is estimated using a probability weighted approach. The obligation is reduced over the term of the guarantee or related contract in a systematic and rational method as risk is reduced. Duke Energy recognizes a liability for the best estimate of its loss due to the nonperformance of the guaranteed party. This liability is recognized at the inception of a guarantee and is updated periodically.
Stock-Based Compensation	Stock-Based CompensationStock-based compensation represents costs related to stock-based awards granted to employees and Board of Directors members. Duke Energy recognizes stock-based compensation based upon the estimated fair value of awards, net of estimated forfeitures at the date of issuance. The recognition period for these costs begins at either the applicable service inception date or grant date and continues throughout the requisite service period. Compensation cost is recognized as expense or capitalized as a component of property, plant and equipment.
Income Taxes	Income Taxes Duke Energy and its subsidiaries file a consolidated federal income tax return and other state and foreign jurisdictional returns. The Subsidiary Registrants are parties to a tax-sharing agreement with Duke Energy. Income taxes recorded represent amounts the Subsidiary Registrants would incur as separate C-Corporations. Deferred income taxes have been provided for temporary differences between GAAP and tax bases of assets and liabilities because the differences create taxable or tax-deductible amounts for future periods. ITCs associated with regulated operations are deferred and amortized as a reduction of income tax expense over the estimated useful lives of the related properties. For ITCs associated with nonregulated operations see “Accounting for Renewable Energy Tax Credits.” Accumulated deferred income taxes are valued using the enacted tax rate expected to apply to taxable income in the periods in which the deferred tax asset or liability is expected to be settled or realized. In the event of a change in tax rates, deferred tax assets and liabilities are remeasured as of the enactment date of the new rate. To the extent that the change in the value of the deferred tax represents an obligation to customers, the impact of the remeasurement is deferred to a regulatory liability. Remaining impacts are recorded in income from continuing operations. Duke Energy's results of operations could be impacted if the estimate of the tax effect of reversing temporary differences is not reflective of actual outcomes, is modified to reflect new developments or interpretations of the tax law, revised to incorporate new accounting principles, or changes in the expected timing or manner of a reversal. Tax-related interest and penalties are recorded in Interest Expense and Other Income and Expenses, net in the Consolidated Statements of Operations.
Accounting for Renewable Energy Tax Credits	Accounting for Renewable Energy Tax Credits When Duke Energy receives ITCs on wind or solar facilities associated with its nonregulated operations, it reduces the basis of the property recorded on the Consolidated Balance Sheets by the amount of the ITC and, therefore, the ITC benefit is ultimately recognized in the statement of operations through reduced depreciation expense. Additionally, certain tax credits and government grants result in an initial tax depreciable base in excess of the book carrying value by an amount equal to one half of the ITC. Deferred tax benefits are recorded as a reduction to income tax expense in the period that the basis difference is created. Duke Energy receives PTCs on wind facilities that are recognized as electricity is produced and records related amounts as a reduction of income tax expense.
Excise Taxes	Excise TaxesCertain excise taxes levied by state or local governments are required to be paid even if not collected from the customer. These taxes are recognized on a gross basis. Taxes for which Duke Energy operates merely as a collection agent for the state and local government are accounted for on a net basis.
Dividend Restrictions and Unappropriated Retained Earnings	Dividend Restrictions and Unappropriated Retained Earnings Duke Energy does not have any current legal, regulatory or other restrictions on paying common stock dividends to shareholders. However, if Duke Energy were to defer dividend payments on the preferred stock, the declaration of common stock dividends would be prohibited. See Note 19 for more information. Additionally, as further described in Note 3, Duke Energy Carolinas, Duke Energy Progress, Duke Energy Ohio, Duke Energy Indiana and Piedmont have restrictions on paying dividends or otherwise advancing funds to Duke Energy due to conditions established by regulators in conjunction with merger transaction approvals. At December 31, 2021, and 2020, an insignificant amount of Duke Energy’s consolidated Retained earnings balance represents undistributed earnings of equity method investments.
New Accounting Standard	New Accounting Standards The following new accounting standard was adopted by the Duke Energy Registrants in 2021. Leases with Variable Lease Payments. In July 2021, the FASB issued new accounting guidance requiring lessors to classify a lease with variable lease payments that do not depend on a reference index or rate as an operating lease if both of the following are met: (1) the lease would have to be classified as a sales-type or direct financing lease under prior guidance, and (2) the lessor would have recognized a day-one loss. Duke Energy elected to adopt the guidance immediately upon issuance of the new standard and will be applying the new standard prospectively to new lease arrangements meeting the criteria. Duke Energy did not have any lease arrangements that this new accounting guidance materially impacted. The following new accounting standard was adopted by Duke Energy Registrants in 2020. Current Expected Credit Losses. In June 2016, the FASB issued new accounting guidance for credit losses. Duke Energy adopted the new accounting guidance for credit losses effective January 1, 2020, using the modified retrospective method of adoption, which does not require restatement of prior year results. Duke Energy did not adopt any practical expedients. Duke Energy recognizes allowances for credit losses based on management's estimate of losses expected to be incurred over the lives of certain assets or guarantees. Management monitors credit quality, changes in expected credit losses and the appropriateness of the allowance for credit losses on a forward-looking basis. Management reviews the risk of loss periodically as part of the existing assessment of collectability of receivables. The following new accounting standard has been issued but not yet adopted by the Duke Energy Registrants as of December 31, 2021. Reference Rate Reform. In March 2020, the FASB issued new accounting guidance for reference rate reform. This guidance is elective and provides expedients to facilitate financial reporting for the anticipated transition away from the London Inter-bank Offered Rate (LIBOR) and other interbank reference rates starting in 2021 with all rates expected to be fully phased out in 2023. The optional expedients are effective for modification of existing contracts or new arrangements executed between March 12, 2020, through December 31, 2022. Duke Energy has variable-rate debt and manages interest rate risk by entering into financial contracts including interest rate swaps that are generally indexed to LIBOR. Impacted financial arrangements extending beyond the phase out of the applicable LIBOR rate may require contractual amendment or termination to fully adapt to a post-LIBOR environment. Duke Energy is assessing these financial arrangements and is evaluating the use of optional expedients outlined in the new accounting guidance. Alternative index provisions are also being assessed and incorporated into new financial arrangements that extend beyond the phase out of the applicable LIBOR rate. The full outcome of the transition away from LIBOR cannot be determined at this time, but is not expected to have a material impact on the financial statements.
Earnings Per Share	Basic EPS is computed by dividing net income available to Duke Energy common stockholders, as adjusted for distributed and undistributed earnings allocated to participating securities and accumulated preferred dividends, by the weighted average number of common shares outstanding during the period. Diluted EPS is computed by dividing net income available to Duke Energy common stockholders, as adjusted for distributed and undistributed earnings allocated to participating securities and accumulated preferred dividends, by the diluted weighted average number of common shares outstanding during the period. Diluted EPS reflects the potential dilution that could occur if securities or other agreements to issue common stock, such as equity forward sale agreements, were exercised or settled.

Summary of Significant Accoun_3

Summary of Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2021
Accounting Policies [Abstract]
Schedule of Current and Noncurrent Assets and Liabilities	The following table provides a description of amounts included in Other within Current Assets or Current Liabilities that exceed 5% of total Current Assets or Current Liabilities on the Duke Energy Registrants' Consolidated Balance Sheets at either December 31, 2021, or 2020. December 31, (in millions) Location 2021 2020 Duke Energy Accrued compensation Current Liabilities $ 915 $ 662 Other accrued liabilities Current Liabilities 649 1,455 Duke Energy Carolinas Accrued compensation Current Liabilities $ 277 $ 213 Duke Energy Progress Customer deposits Current Liabilities $ 144 $ 144 Other accrued liabilities Current Liabilities 163 132 Duke Energy Florida Customer deposits Current Liabilities $ 200 $ 203 Other accrued liabilities Current Liabilities 89 81 Duke Energy Ohio Gas Storage Current Assets $ 25 $ 21 Collateral liabilities Current Liabilities 57 41
Noncontrolling Divestitures And Allocated Losses	The following table presents allocated losses to noncontrolling interest for the years ended December 31, 2021, 2020 and 2019. December 31, (in millions) 2021 2020 2019 Noncontrolling Interest Allocation of Income Allocated losses to noncontrolling tax equity members utilizing the HLBV method $ 298 $ 271 $ 165 Allocated losses to noncontrolling members based on pro rata shares of ownership 31 24 12 Total Noncontrolling Interest Allocated Losses $ 329 $ 295 $ 177
Schedule of Cash and Cash Equivalents	The following table presents the components of cash, cash equivalents and restricted cash included in the Consolidated Balance Sheets. December 31, 2021 Duke Duke Duke Duke Energy Progress Energy Energy Energy Carolinas Energy Progress Florida Current Assets Cash and cash equivalents $ 343 $ 7 $ 70 $ 35 $ 23 Other 170 — 39 — 39 Other Noncurrent Assets Other 7 1 4 4 — Total cash, cash equivalents and restricted cash $ 520 $ 8 $ 113 $ 39 $ 62 December 31, 2020 Duke Duke Duke Duke Energy Progress Energy Energy Energy Carolinas Energy Progress Florida Current Assets Cash and cash equivalents $ 259 $ 21 $ 59 $ 39 $ 11 Other 194 — 39 — 39 Other Noncurrent Assets Other 103 — 102 — — Total cash, cash equivalents and restricted cash $ 556 $ 21 $ 200 $ 39 $ 50
Components of Inventory	The components of inventory are presented in the tables below. December 31, 2021 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Materials and supplies $ 2,397 $ 793 $ 1,067 $ 729 $ 338 $ 80 $ 311 $ 14 Coal 486 195 167 94 73 19 105 — Natural gas, oil and other 316 38 164 98 66 17 2 95 Total inventory $ 3,199 $ 1,026 $ 1,398 $ 921 $ 477 $ 116 $ 418 $ 109 December 31, 2020 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Materials and supplies $ 2,312 $ 785 $ 999 $ 673 $ 325 $ 78 $ 307 $ 12 Coal 561 186 193 131 63 16 165 — Natural gas, oil and other 294 39 183 107 76 16 1 56 Total inventory $ 3,167 $ 1,010 $ 1,375 $ 911 $ 464 $ 110 $ 473 $ 68
Schedule of Property, Plant and Equipment	The composite weighted average depreciation rates, excluding nuclear fuel, are included in the table that follows. Years Ended December 31, 2021 2020 2019 Duke Energy 2.9 % 3.0 % 3.1 % Duke Energy Carolinas 2.7 % 2.8 % 2.8 % Progress Energy 3.1 % 3.2 % 3.1 % Duke Energy Progress 3.0 % 3.1 % 3.1 % Duke Energy Florida 3.3 % 3.3 % 3.1 % Duke Energy Ohio 2.9 % 2.9 % 2.6 % Duke Energy Indiana 3.6 % 3.5 % 3.3 % Piedmont 2.1 % 2.3 % 2.4 % The following tables summarize the property, plant and equipment for Duke Energy and its subsidiary registrants. December 31, 2021 Average Remaining Duke Duke Duke Duke Duke Useful Life Duke Energy Progress Energy Energy Energy Energy (in millions) (Years) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Land $ 2,162 $ 543 $ 957 $ 482 $ 475 $ 219 $ 122 $ 279 Plant – Regulated Electric generation, distribution and transmission 40 120,855 44,910 53,447 32,417 21,030 6,573 15,925 — Natural gas transmission and distribution 54 12,079 — — — — 3,347 — 8,732 Other buildings and improvements 37 1,921 550 514 228 286 381 321 155 Plant – Nonregulated Electric generation, distribution and transmission 28 7,104 — — — — — — — Other buildings and improvements 11 401 — — — — — — — Nuclear fuel 3,181 1,856 1,325 1,325 — — — — Equipment 13 2,659 614 791 497 294 403 262 122 Construction in process 6,168 2,078 2,297 954 1,343 515 460 262 Other 14 5,289 1,323 1,563 1,115 437 287 253 368 Total property, plant and equipment (a)(e) 161,819 51,874 60,894 37,018 23,865 11,725 17,343 9,918 Total accumulated depreciation – regulated (b)(c) (47,611) (17,854) (19,214) (13,387) (5,819) (3,106) (5,583) (1,899) Total accumulated depreciation – nonregulated (d)(e) (2,944) — — — — — — — Facilities to be retired, net 144 102 26 26 — 6 — 11 Total net property, plant and equipment $ 111,408 $ 34,122 $ 41,706 $ 23,657 $ 18,046 $ 8,625 $ 11,760 $ 8,030 (a) Includes finance leases of $958 million, $335 million, $729 million, $627 million, $102 million and $10 million at Duke Energy, Duke Energy Carolinas, Progress Energy, Duke Energy Progress, Duke Energy Florida and Duke Energy Indiana, respectively, primarily within Plant – Regulated. The Progress Energy, Duke Energy Progress and Duke Energy Florida amounts are net of $178 million, $45 million and $133 million, respectively, of accumulated amortization of finance leases. (b) Includes $1,799 million, $1,064 million, $735 million and $735 million of accumulated amortization of nuclear fuel at Duke Energy, Duke Energy Carolinas, Progress Energy and Duke Energy Progress, respectively. (c) Includes accumulated amortization of finance leases of $9 million, $33 million and $3 million at Duke Energy, Duke Energy Carolinas and Duke Energy Indiana, respectively. (d) Includes accumulated amortization of finance leases of ($1 million) at Duke Energy. (e) Includes gross property, plant and equipment cost of consolidated VIEs of $7,339 million and accumulated depreciation of consolidated VIEs of $1,474 million at Duke Energy. December 31, 2020 Average Remaining Duke Duke Duke Duke Duke Useful Life Duke Energy Progress Energy Energy Energy Energy (in millions) (Years) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Land $ 2,046 $ 536 $ 908 $ 463 $ 445 $ 171 $ 118 $ 279 Plant – Regulated Electric generation, distribution and transmission 39 117,107 44,059 50,785 31,375 19,410 6,255 16,008 — Natural gas transmission and distribution 54 10,799 — — — — 3,136 — 7,663 Other buildings and improvements 36 2,038 740 459 197 262 374 300 165 Plant – Nonregulated Electric generation, distribution and transmission 27 5,444 — — — — — — — Other buildings and improvements 10 519 — — — — — — — Nuclear fuel 3,284 1,837 1,447 1,447 — — — — Equipment 15 2,608 620 759 498 261 385 238 122 Construction in process 6,645 1,645 2,013 709 1,304 407 409 581 Other 14 5,090 1,203 1,521 1,070 441 294 309 324 Total property, plant and equipment (a)(e) 155,580 50,640 57,892 35,759 22,123 11,022 17,382 9,134 Total accumulated depreciation – regulated (b)(c) (46,216) (17,453) (18,368) (12,801) (5,560) (3,013) (5,661) (1,749) Total accumulated depreciation – nonregulated (d)(e) (2,611) — — — — — — — Facilities to be retired, net 29 — 29 29 — — — — Total net property, plant and equipment $ 106,782 $ 33,187 $ 39,553 $ 22,987 $ 16,563 $ 8,009 $ 11,721 $ 7,385 (a) Includes finance leases of $832 million, $335 million, $416 million, $297 million, $119 million, and $10 million at Duke Energy, Duke Energy Carolinas, Progress Energy, Duke Energy Progress, Duke Energy Florida and Duke Energy Indiana, respectively, primarily within Plant – Regulated. The Progress Energy, Duke Energy Progress and Duke Energy Florida amounts are net of $141 million, $24 million and $117 million, respectively, of accumulated amortization of finance leases. (b) Includes $1,832 million, $1,010 million, $822 million and $822 million of accumulated amortization of nuclear fuel at Duke Energy, Duke Energy Carolinas, Progress Energy and Duke Energy Progress, respectively. (c) Includes accumulated amortization of finance leases of $12 million, $23 million, and $3 million at Duke Energy, Duke Energy Carolinas and Duke Energy Indiana, respectively. (d) Includes accumulated amortization of finance leases of $23 million at Duke Energy. (e) Includes gross property, plant and equipment cost of consolidated VIEs of $6,394 million and accumulated depreciation of consolidated VIEs of $1,242 million at Duke Energy.
Schedule of Accounts Payable and Supplier Invoices Sold	The following table presents the outstanding accounts payable balance sold to the financial institution by our suppliers and the supplier invoices sold to the financial institution under the program included within Net cash provided by operating activities on the Consolidated Statements of Cash Flows as of December 31, 2021, and December 31, 2020. December 31, 2021 December 30, 2020 Duke Duke Duke Duke Progress Energy Energy Duke Energy (in millions) Energy Energy Florida Ohio Piedmont Energy Ohio Piedmont Outstanding Accounts Payable Balance Sold $ 19 $ 9 $ 9 $ 6 $ 4 $ 15 $ 1 $ 14 Suppliers Invoices Settled Through The Program 122 10 10 12 100 45 9 36
Schedule of Excise Taxes	Excise taxes accounted for on a gross basis within both Operating Revenues and Property and other taxes in the Consolidated Statements of Operations were as follows. Years Ended December 31, (in millions) 2021 2020 2019 Duke Energy $ 420 $ 415 $ 421 Duke Energy Carolinas 44 43 39 Progress Energy 250 249 256 Duke Energy Progress 22 26 21 Duke Energy Florida 228 223 235 Duke Energy Ohio 102 96 101 Duke Energy Indiana 23 25 23 Piedmont 1 2 2
Summary of Effects of New Accounting Pronouncements	Duke Energy recorded an adjustment for the cumulative effect of a change in accounting principle due to the adoption of this standard on January 1, 2020, as shown in the table below: January 1, 2020 Duke Duke Duke Duke Energy Progress Energy Energy (in millions) Energy Carolinas Energy Progress Florida Piedmont Total pretax impact to Retained Earnings $ 120 $ 16 $ 2 $ 1 $ 1 $ 1

Business Segments (Tables)

Business Segments (Tables)	12 Months Ended
	Dec. 31, 2021
Segment Reporting Information [Line Items]
Business Segment Data	Business segment information is presented in the following tables. Segment assets presented exclude intercompany assets. Year Ended December 31, 2021 Electric Gas Total Utilities and Utilities and Commercial Reportable (in millions) Infrastructure Infrastructure Renewables Segments Other Eliminations Total Unaffiliated Revenues $ 22,570 $ 2,022 $ 476 $ 25,068 $ 29 $ — $ 25,097 Intersegment Revenues 33 90 — 123 82 (205) — Total Revenues $ 22,603 $ 2,112 $ 476 $ 25,191 $ 111 $ (205) $ 25,097 Interest Expense $ 1,432 $ 142 $ 72 $ 1,646 $ 643 $ (9) $ 2,280 Depreciation and amortization 4,251 303 225 4,779 237 (26) 4,990 Equity in earnings (losses) of unconsolidated affiliates 7 8 (34) (19) 47 — 28 Income tax expense (benefit) 494 55 (78) 471 (279) — 192 Segment income (loss) (a)(b)(c)(d) 3,850 396 201 4,447 (652) — 3,795 Less noncontrolling interest 329 Add back preferred stock dividend 106 Income from discontinued operations, net of tax 7 Net income $ 3,579 Capital investments expenditures and acquisitions $ 7,653 $ 1,271 $ 543 $ 9,467 $ 285 $ — $ 9,752 Segment assets 143,841 15,179 6,977 165,997 3,590 — 169,587 (a) Electric Utilities and Infrastructure includes $160 million of expense recorded within Impairment of assets and other charges, $77 million of income within Other Income and expenses, $5 million of expense within Operations, maintenance and other, $13 million of income within regulated operating revenues, $3 million of expense within interest expense and $6 million of expense within Depreciation and amortization on the Duke Energy Carolinas' Consolidated Statement of Operations related to the South Carolina Supreme Court decision on coal ash and insurance proceeds; it also includes $42 million of expense recorded within Impairment of assets and other charges, $34 million of income within Other Income and expenses, $7 million of expense within Operations, maintenance, and other, $15 million of income within Regulated electric operating revenues, $5 million of expense wit hin interest expense and $1 million of expense within Depreciation and amortization on the Duke Energy Progress' Consolidated Statement of Operations. See Notes 3 and 4 for more information. (b) Gas Utilities and Infrastructure includes $20 million, recorded within Equity in earnings (losses) of unconsolidated affiliates on the Consolidated Statements of Operations, related to natural gas pipeline investments. See Note 3 for additional information. (c) Commercial Renewables includes a $35 million loss related to Texas Storm Uri of which ($8 million) is recorded within Nonregulated electric and other revenues, $2 million within Operations, maintenance and other, $29 million within Equity in earnings (losses) of unconsolidated affiliates and $12 million within Loss Attributable to Noncontrolling Interests on the Consolidated Statements of Operations. See Note 4 for additional information. (d) Other includes $133 million recorded within Impairment of assets and other charges, $42 million within Operations, maintenance and other, and $17 million within Depreciation and amortization on the Consolidated Statements of Operations, related to the workplace and workplace realignment. See Note 10 for additional information. Year Ended December 31, 2020 Electric Gas Total Utilities and Utilities and Commercial Reportable (in millions) Infrastructure Infrastructure Renewables Segments Other Eliminations Total Unaffiliated Revenues $ 21,687 $ 1,653 $ 502 $ 23,842 $ 26 $ — $ 23,868 Intersegment Revenues 33 95 — 128 71 (199) — Total Revenues $ 21,720 $ 1,748 $ 502 $ 23,970 $ 97 $ (199) $ 23,868 Interest Expense $ 1,320 $ 135 $ 66 $ 1,521 $ 657 $ (16) $ 2,162 Depreciation and amortization 4,068 258 199 4,525 209 (29) 4,705 Equity in earnings (losses) of unconsolidated affiliates (1) (2,017) — (2,018) 13 — (2,005) Income tax expense (benefit) 340 (349) (65) (74) (162) — (236) Segment income (loss) (a)(b)(c) 2,669 (1,266) 286 1,689 (426) — 1,263 Less noncontrolling interest 295 Add back preferred stock dividend 107 Income from discontinued operations, net of tax 7 Net income $ 1,082 Capital investments expenditures and acquisitions $ 7,629 $ 1,309 $ 1,219 $ 10,157 $ 264 $ — $ 10,421 Segment assets 138,225 13,849 6,716 158,790 3,598 — 162,388 (a) Electric Utilities and Infrastructure includes $948 million of Impairment of assets and other charges and a reversal of $152 million included in Regulated electric operating revenue related to the CCR Settlement Agreement filed with the NCUC. Additionally, Electric Utilities and Infrastructure includes $19 million of Impairment of assets and other charges related to the Clemson University Combined Heat and Power Plant, $5 million of Impairment charges related to the natural gas pipeline assets and $16 million of shareholder contributions within Operations, maintenance and other related to Duke Energy Carolinas' and Duke Energy Progress' 2019 North Carolina rate cases. See Note 3 for additional information. (b) Gas Utilities and Infrastructure includes $2.1 billion recorded within Equity in (losses) earnings of unconsolidated affiliates and $7 million of Impairment of assets and other charges related to natural gas pipeline investments. See Notes 3 and 12 for additional information. (c) Other includes a $98 million reversal of 2018 severance costs due to a partial settlement in the Duke Energy Carolinas' 2019 North Carolina rate case. See Note 20 for additional information. Year Ended December 31, 2019 Electric Gas Total Utilities and Utilities and Commercial Reportable (in millions) Infrastructure Infrastructure Renewables Segments Other Eliminations Total Unaffiliated Revenues $ 22,798 $ 1,770 $ 487 $ 25,055 $ 24 $ — $ 25,079 Intersegment Revenues 33 96 — 129 71 (200) — Total Revenues $ 22,831 $ 1,866 $ 487 $ 25,184 $ 95 $ (200) $ 25,079 Interest Expense $ 1,345 $ 117 $ 95 $ 1,557 $ 705 $ (58) $ 2,204 Depreciation and amortization 3,951 256 168 4,375 178 (5) 4,548 Equity in earnings (losses) of unconsolidated affiliates 9 114 (4) 119 43 — 162 Income tax expense (benefit) 785 22 (115) 692 (173) — 519 Segment income (loss) (a)(b) 3,536 432 198 4,166 (452) — 3,714 Less noncontrolling interest 177 Add back preferred stock dividend 41 Loss from discontinued operations, net of tax (7) Net income $ 3,571 Capital investments expenditures and acquisitions $ 8,263 $ 1,539 $ 1,423 $ 11,225 $ 221 $ — $ 11,446 Segment assets 135,561 13,921 6,020 155,502 3,148 188 158,838 (a) Electric Utilities and Infrastructure includes a $27 million reduction of a prior year impairment at Citrus County CC related to the plant's cost cap. (b) Gas Utilities and Infrastructure includes an after-tax impairment charge of $19 million for the remaining investment in Constitution. See Note 12 for additional information.
Schedule of Revenue, By Products and Services	Products and Services The following table summarizes revenues of the reportable segments by type. Retail Wholesale Retail Total (in millions) Electric Electric Natural Gas Other Revenues 2021 Electric Utilities and Infrastructure $ 19,410 $ 2,216 $ — $ 977 $ 22,603 Gas Utilities and Infrastructure — — 2,025 87 2,112 Commercial Renewables — 411 — 65 476 Total Reportable Segments $ 19,410 $ 2,627 $ 2,025 $ 1,129 $ 25,191 2020 Electric Utilities and Infrastructure $ 18,898 $ 1,878 $ — $ 944 $ 21,720 Gas Utilities and Infrastructure — — 1,691 57 1,748 Commercial Renewables — 434 — 68 502 Total Reportable Segments $ 18,898 $ 2,312 $ 1,691 $ 1,069 $ 23,970 2019 Electric Utilities and Infrastructure $ 19,745 $ 2,231 $ — $ 855 $ 22,831 Gas Utilities and Infrastructure — — 1,782 84 1,866 Commercial Renewables — 389 — 98 487 Total Reportable Segments $ 19,745 $ 2,620 $ 1,782 $ 1,037 $ 25,184
Duke Energy Ohio
Segment Reporting Information [Line Items]
Business Segment Data	Year Ended December 31, 2021 Electric Gas Total Utilities and Utilities and Reportable (in millions) Infrastructure Infrastructure Segments Other Eliminations Total Total revenues $ 1,493 $ 544 $ 2,037 $ — $ — $ 2,037 Interest expense $ 87 $ 24 $ 111 $ — $ — $ 111 Depreciation and amortization 217 90 307 — — 307 Income tax expense (benefit) 15 19 34 (4) — 30 Segment income (loss)/Net income 141 78 219 (15) — 204 Capital expenditures $ 486 $ 362 $ 848 $ — $ — $ 848 Segment assets 6,882 3,892 10,774 29 (29) 10,774 Year Ended December 31, 2020 Electric Gas Total Utilities and Utilities and Reportable (in millions) Infrastructure Infrastructure Segments Other Eliminations Total Total revenues $ 1,405 $ 453 $ 1,858 $ — $ — $ 1,858 Interest expense $ 85 $ 17 $ 102 $ — $ — $ 102 Depreciation and amortization 200 78 278 — — 278 Income tax expense (benefit) 19 26 45 (2) — 43 Segment income (loss)/Net Income 162 96 258 (6) — 252 Capital expenditures $ 548 $ 286 $ 834 $ — $ — $ 834 Segment assets 6,615 3,380 9,995 32 (2) 10,025 Year Ended December 31, 2019 Electric Gas Total Utilities and Utilities and Reportable (in millions) Infrastructure Infrastructure Segments Other Eliminations Total Total revenues $ 1,456 $ 484 $ 1,940 $ — $ — $ 1,940 Interest expense $ 80 $ 29 $ 109 $ — $ — $ 109 Depreciation and amortization 182 83 265 — — 265 Income tax expense (benefit) 20 21 41 (1) — 40 Segment income (loss) 159 85 244 (5) — 239 Loss from discontinued operations, net of tax (1) Net income $ 238 Capital expenditures $ 680 $ 272 $ 952 $ — $ — $ 952 Segment assets 6,188 3,116 9,304 34 — 9,338

Regulatory Matters (Tables)

Regulatory Matters (Tables)	12 Months Ended
	Dec. 31, 2021
Public Utilities, General Disclosures [Line Items]
Schedule of Regulatory Assets	The following tables present the regulatory assets and liabilities recorded on the Consolidated Balance Sheets of Duke Energy and Progress Energy. See separate tables below for balances by individual registrant. Duke Energy Progress Energy December 31, December 31, (in millions) 2021 2020 2021 2020 Regulatory Assets AROs – coal ash $ 3,408 $ 3,408 $ 1,399 $ 1,357 AROs – nuclear and other 684 754 620 685 Accrued pension and OPEB 2,017 2,317 725 875 Deferred fuel and purchased power 1,253 213 718 162 Storm cost securitized balance, net 991 — 759 — Nuclear asset securitized balance, net 937 991 937 991 Debt fair value adjustment 884 950 — — Retired generation facilities 357 417 265 363 Post-in-service carrying costs (PISCC) and deferred operating expenses 356 397 47 51 Hedge costs deferrals 348 351 137 148 Deferred asset – Lee and Harris COLA 317 356 21 32 Advanced metering infrastructure (AMI) 311 311 130 102 Customer connect project 242 136 124 55 Demand side management (DSM)/Energy efficiency (EE) 235 242 230 241 Vacation accrual 221 221 42 42 Storm cost deferrals 213 1,102 189 893 NCEMPA deferrals 165 124 165 124 CEP deferral 161 117 — — Derivatives – natural gas supply contracts 139 122 — — COR settlement 123 128 32 33 Nuclear deferral 120 123 42 35 Deferred pipeline integrity costs 108 92 — — Costs of removal regulatory asset 107 — 107 — Manufactured gas plant (MGP) 104 104 — — Qualifying facility contract buyouts 94 107 94 107 ABSAT, coal ash basin closure 90 98 23 27 Incremental COVID-19 expenses 87 76 28 23 Amounts due from customers 85 110 — — Deferred severance charges 54 86 18 29 Other 426 609 87 158 Total regulatory assets 14,637 14,062 6,939 6,533 Less: current portion 2,150 1,641 1,030 758 Total noncurrent regulatory assets $ 12,487 $ 12,421 $ 5,909 $ 5,775 Regulatory Liabilities Net regulatory liability related to income taxes $ 7,199 $ 7,368 $ 2,394 $ 2,411 Costs of removal 6,150 5,883 2,955 2,666 AROs – nuclear and other 2,053 1,512 — — Provision for rate refunds 274 344 87 123 Hedge cost deferrals 271 24 117 8 Accrued pension and OPEB 213 177 — — Other 1,203 1,098 491 483 Total regulatory liabilities 17,363 16,406 6,044 5,691 Less: current portion 1,211 1,377 478 640 Total noncurrent regulatory liabilities $ 16,152 $ 15,029 $ 5,566 $ 5,051
Schedule Of Regulatory Liabilities	The following tables present the regulatory assets and liabilities recorded on the Consolidated Balance Sheets of Duke Energy and Progress Energy. See separate tables below for balances by individual registrant. Duke Energy Progress Energy December 31, December 31, (in millions) 2021 2020 2021 2020 Regulatory Assets AROs – coal ash $ 3,408 $ 3,408 $ 1,399 $ 1,357 AROs – nuclear and other 684 754 620 685 Accrued pension and OPEB 2,017 2,317 725 875 Deferred fuel and purchased power 1,253 213 718 162 Storm cost securitized balance, net 991 — 759 — Nuclear asset securitized balance, net 937 991 937 991 Debt fair value adjustment 884 950 — — Retired generation facilities 357 417 265 363 Post-in-service carrying costs (PISCC) and deferred operating expenses 356 397 47 51 Hedge costs deferrals 348 351 137 148 Deferred asset – Lee and Harris COLA 317 356 21 32 Advanced metering infrastructure (AMI) 311 311 130 102 Customer connect project 242 136 124 55 Demand side management (DSM)/Energy efficiency (EE) 235 242 230 241 Vacation accrual 221 221 42 42 Storm cost deferrals 213 1,102 189 893 NCEMPA deferrals 165 124 165 124 CEP deferral 161 117 — — Derivatives – natural gas supply contracts 139 122 — — COR settlement 123 128 32 33 Nuclear deferral 120 123 42 35 Deferred pipeline integrity costs 108 92 — — Costs of removal regulatory asset 107 — 107 — Manufactured gas plant (MGP) 104 104 — — Qualifying facility contract buyouts 94 107 94 107 ABSAT, coal ash basin closure 90 98 23 27 Incremental COVID-19 expenses 87 76 28 23 Amounts due from customers 85 110 — — Deferred severance charges 54 86 18 29 Other 426 609 87 158 Total regulatory assets 14,637 14,062 6,939 6,533 Less: current portion 2,150 1,641 1,030 758 Total noncurrent regulatory assets $ 12,487 $ 12,421 $ 5,909 $ 5,775 Regulatory Liabilities Net regulatory liability related to income taxes $ 7,199 $ 7,368 $ 2,394 $ 2,411 Costs of removal 6,150 5,883 2,955 2,666 AROs – nuclear and other 2,053 1,512 — — Provision for rate refunds 274 344 87 123 Hedge cost deferrals 271 24 117 8 Accrued pension and OPEB 213 177 — — Other 1,203 1,098 491 483 Total regulatory liabilities 17,363 16,406 6,044 5,691 Less: current portion 1,211 1,377 478 640 Total noncurrent regulatory liabilities $ 16,152 $ 15,029 $ 5,566 $ 5,051
Schedule of Potential Plant Retirements	The table below contains the net carrying value of generating facilities planned for retirement or included in recent IRPs as evaluated for potential retirement. Dollar amounts in the table below are included in Net property, plant and equipment on the Consolidated Balance Sheets as of December 31, 2021, and exclude capitalized asset retirement costs. Remaining Net Capacity Book Value (in MW) (in millions) Duke Energy Carolinas Allen Steam Station Unit 1 (a) 167 $ 12 Allen Steam Station Unit 5 (b) 259 277 Cliffside Unit 5 (b) 546 365 Duke Energy Progress Mayo Unit 1 (b) 713 631 Roxboro Units 3-4 (b) 1,409 457 Duke Energy Florida Crystal River Units 4-5 (c) 1,442 1,650 Duke Energy Indiana (d) Gibson Units 1-5 (e) 2,845 1,829 Cayuga Units 1-2 (e) 1,005 696 Total Duke Energy 8,386 $ 5,917 (a) As part of the 2015 resolution of a lawsuit involving alleged New Source Review violations, Duke Energy Carolinas must retire Allen Steam Station Units 1 through 3 by December 31, 2024. The long-term energy options considered in the IRP could result in retirement of these units earlier than their current estimated useful lives. Unit 3 with a capacity of 270 MW and a net book value of $26 million at December 31, 2020, was retired in March 2021, and unit 2 with a capacity of 167 MW and a net book value of $44 million at December 31, 2020, was retired in December 2021. (b) These units were included in the IRP filed by Duke Energy Carolinas and Duke Energy Progress in North Carolina and South Carolina on September 1, 2020. The long-term energy options considered in the IRP could result in retirement of these units earlier than their current estimated useful lives. In 2019, Duke Energy Carolinas and Duke Energy Progress filed North Carolina rate cases that included depreciation studies that accelerate end-of-life dates for these plants. The NCUC issued orders in the 2019 rate cases of Duke Energy Carolinas and Duke Energy Progress on March 31, 2021, and April 16, 2021, respectively, in which the proposals to shorten the remaining depreciable lives of these units were denied, while indicating the IRP proceeding was the appropriate proceeding for the review of generating plant retirements. Allen Unit 4 with a capacity of 267 MW and a net book value of $170 million at December 31, 2020, was retired in December 2021. (c) On January 14, 2021, Duke Energy Florida filed the 2021 Settlement with the FPSC, which proposed depreciation rates reflecting retirement dates for Duke Energy Florida's last two coal-fired generating facilities, Crystal River Units 4-5, eight years ahead of schedule in 2034 rather than in 2042. The FPSC approved the 2021 Settlement on May 4, 2021. (d) Gallagher Units 2 and 4 with a total capacity of 280 MW and a total net book value of $102 million at December 31, 2020, were retired on June 1, 2021. (e) The rate case filed July 2, 2019, included proposed depreciation rates reflecting retirement dates from 2026 to 2038. The depreciation rates reflecting these updated retirement dates were approved by the IURC as part of the rate case order issued on June 29, 2020.
Duke Energy Carolinas
Public Utilities, General Disclosures [Line Items]
Schedule of Regulatory Assets	The following tables present the regulatory assets and liabilities recorded on Duke Energy Carolinas' Consolidated Balance Sheets. December 31, Earns/Pays Recovery/Refund (in millions) 2021 2020 a Return Period Ends Regulatory Assets (a) AROs – coal ash $ 1,227 $ 1,414 (h) (b) Accrued pension and OPEB (c) 365 427 Yes (i) Deferred fuel and purchased power 339 42 (e) 2023 Storm cost securitized balance, net 232 — 2041 Retired generation facilities (c) 54 11 Yes 2023 PISCC (c) 31 32 Yes (b) Hedge costs deferrals (c) 171 174 Yes (b) Deferred asset – Lee COLA 296 324 (b) AMI 140 154 Yes (b) Customer connect project 66 50 Yes (b) Vacation accrual 83 84 2022 Storm cost deferrals 22 205 Yes (b) COR settlement 91 95 Yes (b) Nuclear deferral 78 88 2023 ABSAT, coal ash basin closure 67 71 Yes (b) Incremental COVID-19 expenses 51 31 Yes (b) Deferred severance charges 36 57 2023 Other 130 210 (b) Total regulatory assets 3,479 3,469 Less: current portion 544 473 Total noncurrent regulatory assets $ 2,935 $ 2,996 Regulatory Liabilities (a) Net regulatory liability related to income taxes (d) $ 2,785 $ 2,874 (b) Costs of removal (c) 2,009 1,975 Yes (f) AROs – nuclear and other 2,053 1,512 (b) Provision for rate refunds (c) 124 170 Yes Hedge cost deferrals 154 16 (b) Accrued pension and OPEB (c) 44 32 Yes (i) Other 516 429 (b) Total regulatory liabilities 7,685 7,008 Less: current portion 487 473 Total noncurrent regulatory liabilities $ 7,198 $ 6,535 (a) Regulatory assets and liabilities are excluded from rate base unless otherwise noted. (b) The expected recovery or refund period varies or has not been determined. (c) Included in rate base. (d) Includes regulatory liabilities related to the change in the federal tax rate as a result of the Tax Act and the change in the North Carolina tax rate, both discussed in Note 23. Portions are included in rate base. (e) Pays interest on over-recovered costs in North Carolina. Includes certain purchased power costs in North Carolina and South Carolina and costs of distributed energy in South Carolina. (f) Recovered over the life of the associated assets. (g) Includes incentives on DSM/EE investments and is recovered through an annual rider mechanism. (h) Earns a debt and equity return on coal ash expenditures for North Carolina and South Carolina retail customers as permitted by various regulatory orders. (i) Recovered primarily over the average remaining service periods or life expectancies of employees covered by the benefit plans. See Note 22 for additional detail.
Schedule Of Regulatory Liabilities	The following tables present the regulatory assets and liabilities recorded on Duke Energy Carolinas' Consolidated Balance Sheets. December 31, Earns/Pays Recovery/Refund (in millions) 2021 2020 a Return Period Ends Regulatory Assets (a) AROs – coal ash $ 1,227 $ 1,414 (h) (b) Accrued pension and OPEB (c) 365 427 Yes (i) Deferred fuel and purchased power 339 42 (e) 2023 Storm cost securitized balance, net 232 — 2041 Retired generation facilities (c) 54 11 Yes 2023 PISCC (c) 31 32 Yes (b) Hedge costs deferrals (c) 171 174 Yes (b) Deferred asset – Lee COLA 296 324 (b) AMI 140 154 Yes (b) Customer connect project 66 50 Yes (b) Vacation accrual 83 84 2022 Storm cost deferrals 22 205 Yes (b) COR settlement 91 95 Yes (b) Nuclear deferral 78 88 2023 ABSAT, coal ash basin closure 67 71 Yes (b) Incremental COVID-19 expenses 51 31 Yes (b) Deferred severance charges 36 57 2023 Other 130 210 (b) Total regulatory assets 3,479 3,469 Less: current portion 544 473 Total noncurrent regulatory assets $ 2,935 $ 2,996 Regulatory Liabilities (a) Net regulatory liability related to income taxes (d) $ 2,785 $ 2,874 (b) Costs of removal (c) 2,009 1,975 Yes (f) AROs – nuclear and other 2,053 1,512 (b) Provision for rate refunds (c) 124 170 Yes Hedge cost deferrals 154 16 (b) Accrued pension and OPEB (c) 44 32 Yes (i) Other 516 429 (b) Total regulatory liabilities 7,685 7,008 Less: current portion 487 473 Total noncurrent regulatory liabilities $ 7,198 $ 6,535 (a) Regulatory assets and liabilities are excluded from rate base unless otherwise noted. (b) The expected recovery or refund period varies or has not been determined. (c) Included in rate base. (d) Includes regulatory liabilities related to the change in the federal tax rate as a result of the Tax Act and the change in the North Carolina tax rate, both discussed in Note 23. Portions are included in rate base. (e) Pays interest on over-recovered costs in North Carolina. Includes certain purchased power costs in North Carolina and South Carolina and costs of distributed energy in South Carolina. (f) Recovered over the life of the associated assets. (g) Includes incentives on DSM/EE investments and is recovered through an annual rider mechanism. (h) Earns a debt and equity return on coal ash expenditures for North Carolina and South Carolina retail customers as permitted by various regulatory orders. (i) Recovered primarily over the average remaining service periods or life expectancies of employees covered by the benefit plans. See Note 22 for additional detail.
Duke Energy Progress
Public Utilities, General Disclosures [Line Items]
Schedule of Regulatory Assets	The following tables present the regulatory assets and liabilities recorded on Duke Energy Progress' Consolidated Balance Sheets. December 31, Earns/Pays Recovery/Refund (in millions) 2021 2020 a Return Period Ends Regulatory Assets (a) AROs – coal ash $ 1,389 $ 1,347 (h) (b) AROs – nuclear and other 613 683 (c) Accrued pension and OPEB 351 393 (k) Deferred fuel and purchased power 303 158 (f) 2023 Storm cost securitized balance, net 759 — 2041 Retired generation facilities 171 189 Yes (b) PISCC and deferred operating expenses 47 51 Yes 2054 Hedge costs deferrals 60 89 (b) Deferred asset – Harris COLA 21 32 (b) AMI 92 57 Yes (b) Customer connect project 57 25 Yes (b) DSM/EE (e) 218 224 (i) (i) Vacation accrual 42 42 2022 Storm cost deferrals (d) 170 785 Yes (b) NCEMPA deferrals 165 124 (g) 2042 COR settlement 32 33 Yes (b) Nuclear deferral 42 35 2023 ABSAT, coal ash basin closure 23 27 Yes (b) Incremental COVID-19 expenses 28 23 Yes (b) Deferred severance charges 18 29 2023 Other 50 122 (b) Total regulatory assets 4,651 4,468 Less: current portion 533 492 Total noncurrent regulatory assets $ 4,118 $ 3,976 Regulatory Liabilities (a) Net regulatory liability related to income taxes (l) $ 1,695 $ 1,662 (b) Costs of removal 2,955 2,666 Yes (j) Provision for rate refunds 87 123 Yes Hedge cost deferrals 117 8 (b) Other 395 465 (b) Total regulatory liabilities 5,249 4,924 Less: current portion 381 530 Total noncurrent regulatory liabilities $ 4,868 $ 4,394 (a) Regulatory assets and liabilities are excluded from rate base unless otherwise noted. (b) The expected recovery or refund period varies or has not been determined. (c) Recovery period for costs related to nuclear facilities runs through the decommissioning period of each unit. (d) South Carolina storm costs are included in rate base. (e) Included in rate base. (f) Pays interest on over-recovered costs in North Carolina. Includes certain purchased power costs in North Carolina and South Carolina and costs of distributed energy in South Carolina. (g) South Carolina retail allocated costs are earning a return. (h) Earns a debt and equity return on coal ash expenditures for North Carolina and South Carolina retail customers as permitted by various regulatory orders. (i) Includes incentives on DSM/EE investments and is recovered through an annual rider mechanism. (j) Recovered over the life of the associated assets. (k) Recovered primarily over the average remaining service periods or life expectancies of employees covered by the benefit plans. See Note 22 for additional detail. (l) Includes regulatory liabilities related to the change in the federal tax rate as a result of the Tax Act and the change in the North Carolina tax rate, both discussed in Note 23. Portions are included in rate base.
Schedule Of Regulatory Liabilities	The following tables present the regulatory assets and liabilities recorded on Duke Energy Progress' Consolidated Balance Sheets. December 31, Earns/Pays Recovery/Refund (in millions) 2021 2020 a Return Period Ends Regulatory Assets (a) AROs – coal ash $ 1,389 $ 1,347 (h) (b) AROs – nuclear and other 613 683 (c) Accrued pension and OPEB 351 393 (k) Deferred fuel and purchased power 303 158 (f) 2023 Storm cost securitized balance, net 759 — 2041 Retired generation facilities 171 189 Yes (b) PISCC and deferred operating expenses 47 51 Yes 2054 Hedge costs deferrals 60 89 (b) Deferred asset – Harris COLA 21 32 (b) AMI 92 57 Yes (b) Customer connect project 57 25 Yes (b) DSM/EE (e) 218 224 (i) (i) Vacation accrual 42 42 2022 Storm cost deferrals (d) 170 785 Yes (b) NCEMPA deferrals 165 124 (g) 2042 COR settlement 32 33 Yes (b) Nuclear deferral 42 35 2023 ABSAT, coal ash basin closure 23 27 Yes (b) Incremental COVID-19 expenses 28 23 Yes (b) Deferred severance charges 18 29 2023 Other 50 122 (b) Total regulatory assets 4,651 4,468 Less: current portion 533 492 Total noncurrent regulatory assets $ 4,118 $ 3,976 Regulatory Liabilities (a) Net regulatory liability related to income taxes (l) $ 1,695 $ 1,662 (b) Costs of removal 2,955 2,666 Yes (j) Provision for rate refunds 87 123 Yes Hedge cost deferrals 117 8 (b) Other 395 465 (b) Total regulatory liabilities 5,249 4,924 Less: current portion 381 530 Total noncurrent regulatory liabilities $ 4,868 $ 4,394 (a) Regulatory assets and liabilities are excluded from rate base unless otherwise noted. (b) The expected recovery or refund period varies or has not been determined. (c) Recovery period for costs related to nuclear facilities runs through the decommissioning period of each unit. (d) South Carolina storm costs are included in rate base. (e) Included in rate base. (f) Pays interest on over-recovered costs in North Carolina. Includes certain purchased power costs in North Carolina and South Carolina and costs of distributed energy in South Carolina. (g) South Carolina retail allocated costs are earning a return. (h) Earns a debt and equity return on coal ash expenditures for North Carolina and South Carolina retail customers as permitted by various regulatory orders. (i) Includes incentives on DSM/EE investments and is recovered through an annual rider mechanism. (j) Recovered over the life of the associated assets. (k) Recovered primarily over the average remaining service periods or life expectancies of employees covered by the benefit plans. See Note 22 for additional detail. (l) Includes regulatory liabilities related to the change in the federal tax rate as a result of the Tax Act and the change in the North Carolina tax rate, both discussed in Note 23. Portions are included in rate base.
Duke Energy Florida
Public Utilities, General Disclosures [Line Items]
Schedule of Regulatory Assets	The following tables present the regulatory assets and liabilities recorded on Duke Energy Florida's Consolidated Balance Sheets. December 31, Earns/Pays Recovery/Refund (in millions) 2021 2020 a Return Period Ends Regulatory Assets (a) AROs – coal ash $ 10 $ 10 (b) AROs – nuclear and other 7 2 (b) Accrued pension and OPEB (c) 374 482 Yes (g) Deferred fuel and purchased power 415 4 (f) 2022 Nuclear asset securitized balance, net 937 991 2036 Retired generation facilities (c) 94 174 Yes 2044 Hedge costs deferrals (c) 77 59 Yes 2038 AMI (c) 38 45 Yes 2032 Customer connect project 67 30 2037 DSM/EE (c) 12 17 Yes 2025 Storm cost deferrals (c) 19 108 (e) (b) Costs of removal regulatory asset (c) 107 — (d) (b) Qualifying facility contract buyouts (c) 94 107 Yes 2034 Other 37 35 (d) (b) Total regulatory assets 2,288 2,064 Less: current portion 497 265 Total noncurrent regulatory assets $ 1,791 $ 1,799 Regulatory Liabilities (a) Net regulatory liability related to income taxes (c) $ 699 $ 749 (b) Other 97 19 (d) (b) Total regulatory liabilities 796 768 Less: current portion 98 110 Total noncurrent regulatory liabilities $ 698 $ 658 (a) Regulatory assets and liabilities are excluded from rate base unless otherwise noted. (b) The expected recovery or refund period varies or has not been determined. (c) Included in rate base. (d) Certain costs earn/pay a return. (e) Earns a debt return/interest once collections begin. (f) Earns commercial paper rate. (g) Recovered primarily over the average remaining service periods or life expectancies of employees covered by the benefit plans. See Note 22 for additional detail.
Schedule Of Regulatory Liabilities	The following tables present the regulatory assets and liabilities recorded on Duke Energy Florida's Consolidated Balance Sheets. December 31, Earns/Pays Recovery/Refund (in millions) 2021 2020 a Return Period Ends Regulatory Assets (a) AROs – coal ash $ 10 $ 10 (b) AROs – nuclear and other 7 2 (b) Accrued pension and OPEB (c) 374 482 Yes (g) Deferred fuel and purchased power 415 4 (f) 2022 Nuclear asset securitized balance, net 937 991 2036 Retired generation facilities (c) 94 174 Yes 2044 Hedge costs deferrals (c) 77 59 Yes 2038 AMI (c) 38 45 Yes 2032 Customer connect project 67 30 2037 DSM/EE (c) 12 17 Yes 2025 Storm cost deferrals (c) 19 108 (e) (b) Costs of removal regulatory asset (c) 107 — (d) (b) Qualifying facility contract buyouts (c) 94 107 Yes 2034 Other 37 35 (d) (b) Total regulatory assets 2,288 2,064 Less: current portion 497 265 Total noncurrent regulatory assets $ 1,791 $ 1,799 Regulatory Liabilities (a) Net regulatory liability related to income taxes (c) $ 699 $ 749 (b) Other 97 19 (d) (b) Total regulatory liabilities 796 768 Less: current portion 98 110 Total noncurrent regulatory liabilities $ 698 $ 658 (a) Regulatory assets and liabilities are excluded from rate base unless otherwise noted. (b) The expected recovery or refund period varies or has not been determined. (c) Included in rate base. (d) Certain costs earn/pay a return. (e) Earns a debt return/interest once collections begin. (f) Earns commercial paper rate. (g) Recovered primarily over the average remaining service periods or life expectancies of employees covered by the benefit plans. See Note 22 for additional detail.
Duke Energy Ohio
Public Utilities, General Disclosures [Line Items]
Schedule of Regulatory Assets	The following tables present the regulatory assets and liabilities recorded on Duke Energy Ohio's Consolidated Balance Sheets. December 31, Earns/Pays Recovery/Refund (in millions) 2021 2020 a Return Period Ends Regulatory Assets (a) AROs – coal ash $ 33 $ 22 Yes (b) Accrued pension and OPEB 133 149 (g) Deferred fuel and purchased power 38 — 2022 PISCC and deferred operating expenses (c) 16 16 Yes 2083 Hedge costs deferrals 5 7 (b) AMI 24 36 (b) Customer connect project 41 26 (b) DSM/EE 5 1 (f) (e) Vacation accrual 6 6 2022 Storm cost deferrals 2 4 2023 CEP deferral 161 117 Yes (b) Deferred pipeline integrity costs 24 21 Yes (b) MGP 104 104 (b) Other 115 140 (b) Total regulatory assets 707 649 Less: current portion 72 39 Total noncurrent regulatory assets $ 635 $ 610 Regulatory Liabilities (a) Net regulatory liability related to income taxes $ 602 $ 628 (b) Costs of removal 39 68 (d) Provision for rate refunds 61 45 (b) Accrued pension and OPEB 21 17 (g) Other 78 55 (b) Total regulatory liabilities 801 813 Less: current portion 62 65 Total noncurrent regulatory liabilities $ 739 $ 748 (a) Regulatory assets and liabilities are excluded from rate base unless otherwise noted. (b) The expected recovery or refund period varies or has not been determined. (c) Included in rate base. (d) Recovery over the life of the associated assets. (e) Recovered via a rider mechanism. (f) Includes incentives on DSM/EE investments. (g) Recovered primarily over the average remaining service periods or life expectancies of employees covered by the benefit plans. See Note 22 for additional detail.
Schedule Of Regulatory Liabilities	The following tables present the regulatory assets and liabilities recorded on Duke Energy Ohio's Consolidated Balance Sheets. December 31, Earns/Pays Recovery/Refund (in millions) 2021 2020 a Return Period Ends Regulatory Assets (a) AROs – coal ash $ 33 $ 22 Yes (b) Accrued pension and OPEB 133 149 (g) Deferred fuel and purchased power 38 — 2022 PISCC and deferred operating expenses (c) 16 16 Yes 2083 Hedge costs deferrals 5 7 (b) AMI 24 36 (b) Customer connect project 41 26 (b) DSM/EE 5 1 (f) (e) Vacation accrual 6 6 2022 Storm cost deferrals 2 4 2023 CEP deferral 161 117 Yes (b) Deferred pipeline integrity costs 24 21 Yes (b) MGP 104 104 (b) Other 115 140 (b) Total regulatory assets 707 649 Less: current portion 72 39 Total noncurrent regulatory assets $ 635 $ 610 Regulatory Liabilities (a) Net regulatory liability related to income taxes $ 602 $ 628 (b) Costs of removal 39 68 (d) Provision for rate refunds 61 45 (b) Accrued pension and OPEB 21 17 (g) Other 78 55 (b) Total regulatory liabilities 801 813 Less: current portion 62 65 Total noncurrent regulatory liabilities $ 739 $ 748 (a) Regulatory assets and liabilities are excluded from rate base unless otherwise noted. (b) The expected recovery or refund period varies or has not been determined. (c) Included in rate base. (d) Recovery over the life of the associated assets. (e) Recovered via a rider mechanism. (f) Includes incentives on DSM/EE investments. (g) Recovered primarily over the average remaining service periods or life expectancies of employees covered by the benefit plans. See Note 22 for additional detail.
Schedule of MISO Exit Fee Obligations	The following table provides a reconciliation of the beginning and ending balance of Duke Energy Ohio’s recorded liability for its exit obligation and share of MTEP costs recorded in Other within Current Liabilities and Other Noncurrent Liabilities on the Consolidated Balance Sheets. The retail portions of MTEP costs billed by MISO are recovered by Duke Energy Ohio through a non-bypassable rider. As of December 31, 2021, and 2020, $33 million and $37 million, respectively, are recorded in Regulatory assets on Duke Energy Ohio's Consolidated Balance Sheets. Provisions/ Cash (in millions) December 31, 2020 Adjustments Reductions December 31, 2021 Duke Energy Ohio $ 50 $ — $ (4) $ 46
Duke Energy Indiana
Public Utilities, General Disclosures [Line Items]
Schedule of Regulatory Assets	The following tables present the regulatory assets and liabilities recorded on Duke Energy Indiana's Consolidated Balance Sheets. December 31, Earns/Pays Recovery/Refund (in millions) 2021 2020 a Return Period Ends Regulatory Assets (a) AROs – coal ash $ 749 $ 615 Yes (b) Accrued pension and OPEB 222 245 (e) Deferred fuel and purchased power 158 9 2022 Retired generation facilities (c) 38 43 Yes 2030 PISCC and deferred operating expenses (c) 262 298 Yes (b) Hedge costs deferrals 35 22 (b) AMI 17 19 2031 Customer connect project 11 5 (b) Vacation accrual 13 12 2022 Other 50 60 (b) Total regulatory assets 1,555 1,328 Less: current portion 277 125 Total noncurrent regulatory assets $ 1,278 $ 1,203 Regulatory Liabilities (a) Net regulatory liability related to income taxes $ 908 $ 956 (b) Costs of removal 575 599 (d) Accrued pension and OPEB 113 100 (e) Other 96 83 (b) Total regulatory liabilities 1,692 1,738 Less: current portion 127 111 Total noncurrent regulatory liabilities $ 1,565 $ 1,627 (a) Regulatory assets and liabilities are excluded from rate base unless otherwise noted. (b) The expected recovery or refund period varies or has not been determined. (c) Included in rate base. (d) Refunded over the life of the associated assets. (e) Recovered primarily over the average remaining service periods or life expectancies of employees covered by the benefit plans. See Note 22 for additional detail.
Schedule Of Regulatory Liabilities	The following tables present the regulatory assets and liabilities recorded on Duke Energy Indiana's Consolidated Balance Sheets. December 31, Earns/Pays Recovery/Refund (in millions) 2021 2020 a Return Period Ends Regulatory Assets (a) AROs – coal ash $ 749 $ 615 Yes (b) Accrued pension and OPEB 222 245 (e) Deferred fuel and purchased power 158 9 2022 Retired generation facilities (c) 38 43 Yes 2030 PISCC and deferred operating expenses (c) 262 298 Yes (b) Hedge costs deferrals 35 22 (b) AMI 17 19 2031 Customer connect project 11 5 (b) Vacation accrual 13 12 2022 Other 50 60 (b) Total regulatory assets 1,555 1,328 Less: current portion 277 125 Total noncurrent regulatory assets $ 1,278 $ 1,203 Regulatory Liabilities (a) Net regulatory liability related to income taxes $ 908 $ 956 (b) Costs of removal 575 599 (d) Accrued pension and OPEB 113 100 (e) Other 96 83 (b) Total regulatory liabilities 1,692 1,738 Less: current portion 127 111 Total noncurrent regulatory liabilities $ 1,565 $ 1,627 (a) Regulatory assets and liabilities are excluded from rate base unless otherwise noted. (b) The expected recovery or refund period varies or has not been determined. (c) Included in rate base. (d) Refunded over the life of the associated assets. (e) Recovered primarily over the average remaining service periods or life expectancies of employees covered by the benefit plans. See Note 22 for additional detail.
Piedmont
Public Utilities, General Disclosures [Line Items]
Schedule of Regulatory Assets	The following tables present the regulatory assets and liabilities recorded on Piedmont's Consolidated Balance Sheets. December 31, Earns/Pays Recovery/Refund (in millions) 2021 2020 a Return Period Ends Regulatory Assets (a) AROs – nuclear and other $ 22 $ 20 (d) Accrued pension and OPEB (c) 82 88 (g) Vacation accrual 12 12 2022 Derivatives – natural gas supply contracts (f) 139 122 Deferred pipeline integrity costs (c) 84 71 2025 Amounts due from customers 85 110 (e) (b) Other 33 32 (b) Total regulatory assets 457 455 Less: current portion 141 153 Total noncurrent regulatory assets $ 316 $ 302 Regulatory Liabilities (a) Net regulatory liability related to income taxes $ 510 $ 499 (b) Costs of removal (c) 572 575 (d) Provision for rate refunds 2 6 Accrued pension and OPEB (c) 5 3 (g) Other 25 49 (e) (b) Total regulatory liabilities 1,114 1,132 Less: current portion 56 88 Total noncurrent regulatory liabilities $ 1,058 $ 1,044 (a) Regulatory assets and liabilities are excluded from rate base unless otherwise noted. (b) The expected recovery or refund period varies or has not been determined. (c) Included in rate base. (d) Recovery over the life of the associated assets. (e) Certain costs earn/pay a return. (f) Balance will fluctuate with changes in the market. Current contracts extend into 2031. (g) Recovered primarily over the average remaining service periods or life expectancies of employees covered by the benefit plans. See Note 22 for additional detail.
Schedule Of Regulatory Liabilities	The following tables present the regulatory assets and liabilities recorded on Piedmont's Consolidated Balance Sheets. December 31, Earns/Pays Recovery/Refund (in millions) 2021 2020 a Return Period Ends Regulatory Assets (a) AROs – nuclear and other $ 22 $ 20 (d) Accrued pension and OPEB (c) 82 88 (g) Vacation accrual 12 12 2022 Derivatives – natural gas supply contracts (f) 139 122 Deferred pipeline integrity costs (c) 84 71 2025 Amounts due from customers 85 110 (e) (b) Other 33 32 (b) Total regulatory assets 457 455 Less: current portion 141 153 Total noncurrent regulatory assets $ 316 $ 302 Regulatory Liabilities (a) Net regulatory liability related to income taxes $ 510 $ 499 (b) Costs of removal (c) 572 575 (d) Provision for rate refunds 2 6 Accrued pension and OPEB (c) 5 3 (g) Other 25 49 (e) (b) Total regulatory liabilities 1,114 1,132 Less: current portion 56 88 Total noncurrent regulatory liabilities $ 1,058 $ 1,044 (a) Regulatory assets and liabilities are excluded from rate base unless otherwise noted. (b) The expected recovery or refund period varies or has not been determined. (c) Included in rate base. (d) Recovery over the life of the associated assets. (e) Certain costs earn/pay a return. (f) Balance will fluctuate with changes in the market. Current contracts extend into 2031. (g) Recovered primarily over the average remaining service periods or life expectancies of employees covered by the benefit plans. See Note 22 for additional detail.

Commitments and Contingencies (

Commitments and Contingencies (Tables)	12 Months Ended
	Dec. 31, 2021
Commitments and Contingencies Disclosure [Abstract]
Schedule of Legal Reserves	The following tables contain information regarding reserves for probable and estimable costs related to the various environmental sites. These reserves are recorded in Other within Other Noncurrent Liabilities on the Consolidated Balance Sheets. (in millions) December 31, 2021 December 31, 2020 Reserves for Environmental Remediation Duke Energy $ 88 $ 75 Duke Energy Carolinas 19 19 Progress Energy 23 19 Duke Energy Progress 11 6 Duke Energy Florida 11 12 Duke Energy Ohio 34 22 Duke Energy Indiana 4 6 Piedmont 9 10
Schedule of Purchase Power Obligations	The following table presents executory purchased power contracts with terms exceeding one year, excluding contracts classified as leases. Minimum Purchase Amount at December 31, 2021 Contract (in millions) Expiration 2022 2023 2024 2025 2026 Thereafter Total Duke Energy Progress (a) 2028-2032 $ 22 $ 22 $ 21 $ 22 $ 18 $ 45 $ 150 Duke Energy Florida (b) 2023-2025 354 374 262 91 — — 1,081 Duke Energy Ohio (c)(d) 2023 53 34 — — — — 87 (a) Contracts represent between 18% and 100% of net plant output. (b) Contracts represent 100% of net plant output. (c) Contracts represent 15% of net plant output. (d) Excludes PPA with OVEC. See Note 17 for additional information.
Schedule of Natural Gas Supply Contract Commitments	The following table presents future unconditional purchase obligations under natural gas supply and capacity contracts as of December 31, 2021. (in millions) 2022 2023 2024 2025 2026 Thereafter Total Duke Energy Ohio $ 62 $ 37 $ 25 $ 16 $ 13 $ 47 $ 200 Piedmont 324 272 225 134 122 503 1,580

Leases (Tables)

Leases (Tables)	12 Months Ended
	Dec. 31, 2021
Leases [Abstract]
Lease Costs and Cash Flows Information	The following tables present the components of lease expense. Year Ended December 31, 2021 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Operating lease expense (a) $ 250 $ 43 $ 155 $ 83 $ 72 $ 11 $ 18 $ 7 Short-term lease expense (a) 5 — 2 1 1 — 2 — Variable lease expense (a) 41 17 22 10 12 — — 1 Finance lease expense Amortization of leased assets (b) 219 5 37 18 19 — 1 — Interest on lease liabilities (c) 55 33 48 42 6 — — — Total finance lease expense 274 38 85 60 25 — 1 — Total lease expense $ 570 $ 98 $ 264 $ 154 $ 110 $ 11 $ 21 $ 8 (a) Included in Operations, maintenance and other or, for barges and railcars, Fuel used in electric generation and purchased power on the Consolidated Statements of Operations. (b) Included in Depreciation and amortization on the Consolidated Statements of Operations. (c) Included in Interest Expense on the Consolidated Statements of Operations. Year Ended December 31, 2020 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Operating lease expense (a) $ 283 $ 53 $ 162 $ 72 $ 90 $ 11 $ 19 $ 7 Short-term lease expense (a) 4 — 2 1 1 — 1 — Variable lease expense (a) 30 13 13 5 8 — 1 1 Finance lease expense Amortization of leased assets (b) 119 8 24 6 18 — 1 — Interest on lease liabilities (c) 61 30 44 37 7 — — — Total finance lease expense 180 38 68 43 25 — 1 — Total lease expense $ 497 $ 104 $ 245 $ 121 $ 124 $ 11 $ 22 $ 8 (a) Included in Operations, maintenance and other or, for barges and railcars, Fuel used in electric generation and purchased power on the Consolidated Statements of Operations. (b) Included in Depreciation and amortization on the Consolidated Statements of Operations. (c) Included in Interest Expense on the Consolidated Statements of Operations. Year Ended December 31, 2021 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Cash paid for amounts included in the measurement of lease liabilities (a) Operating cash flows from operating leases $ 245 $ 25 $ 117 $ 62 $ 55 $ 2 $ 6 $ 5 Operating cash flows from finance leases 55 33 48 42 6 — — — Financing cash flows from finance leases 219 5 37 18 19 — 1 — Lease assets obtained in exchange for new lease liabilities (non-cash) Operating (b) $ 182 $ 4 $ 99 $ 99 $ — $ — $ — $ — Finance 322 — 322 322 — — — — (a) No amounts were classified as investing cash flows from operating leases for the year ended December 31, 2021. (b) Does not include ROU assets recorded as a result of the adoption of the new lease standard. Year Ended December 31, 2020 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Cash paid for amounts included in the measurement of lease liabilities (a) Operating cash flows from operating leases $ 271 $ 31 $ 124 $ 52 $ 72 $ 2 $ 6 $ 5 Operating cash flows from finance leases 61 30 44 37 7 — — — Financing cash flows from finance leases 119 8 24 6 18 — 1 — Lease assets obtained in exchange for new lease liabilities (non-cash) Operating (b) $ 116 $ 17 $ — $ — $ — $ — $ 1 $ — Finance 125 125 — — — — — — (a) No amounts were classified as investing cash flows from operating leases for the year ended December 31, 2020.
Operating Lease Maturities	The following table presents operating lease maturities and a reconciliation of the undiscounted cash flows to operating lease liabilities. December 31, 2021 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont 2022 $ 225 $ 24 $ 118 $ 63 $ 55 $ 2 $ 6 $ 5 2023 212 21 118 64 54 2 6 5 2024 185 14 110 56 54 2 4 5 2025 156 10 96 42 54 2 4 5 2026 136 10 92 38 54 2 4 — Thereafter 594 42 290 220 70 16 50 — Total operating lease payments 1,508 121 824 483 341 26 74 20 Less: present value discount (247) (21) (124) (83) (41) (7) (20) (1) Total operating lease liabilities (a) $ 1,261 $ 100 $ 700 $ 400 $ 300 $ 19 $ 54 $ 19 (a) Certain operating lease payments include renewal options that are reasonably certain to be exercised.
Maturities of Finance Lease Liabilities	The following table presents finance lease maturities and a reconciliation of the undiscounted cash flows to finance lease liabilities. December 31, 2021 Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Indiana 2022 $ 201 $ 38 $ 111 $ 86 $ 25 $ 1 2023 198 38 103 78 25 1 2024 143 38 88 79 9 1 2025 76 38 85 80 5 1 2026 77 38 86 81 5 1 Thereafter 658 464 637 636 1 24 Total finance lease payments 1,353 654 1,110 1,040 70 29 Less: amounts representing interest (438) (365) (420) (411) (9) (19) Total finance lease liabilities $ 915 $ 289 $ 690 $ 629 $ 61 $ 10
Balance Sheet Amounts Recorded for Operating and Finance Leases	The following tables contain additional information related to leases. December 31, 2021 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Classification Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Assets Operating Operating lease ROU assets, net $ 1,266 $ 92 $ 691 $ 389 $ 302 $ 19 $ 53 $ 16 Finance Net property, plant and equipment 950 302 729 627 102 — 7 — Total lease assets $ 2,216 $ 394 $ 1,420 $ 1,016 $ 404 $ 19 $ 60 $ 16 Liabilities Current Operating Other current liabilities $ 187 $ 22 $ 94 $ 50 $ 44 $ 1 $ 4 $ 5 Finance Current maturities of long-term debt 151 6 61 41 20 — — — Noncurrent Operating Operating lease liabilities 1,074 78 606 350 256 18 50 14 Finance Long-Term Debt 764 283 629 588 41 — 10 — Total lease liabilities $ 2,176 $ 389 $ 1,390 $ 1,029 $ 361 $ 19 $ 64 $ 19 December 31, 2020 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Classification Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Assets Operating Operating lease ROU assets, net $ 1,524 $ 110 $ 690 $ 346 $ 344 $ 20 $ 55 $ 20 Finance Net property, plant and equipment 797 312 416 297 119 — 7 — Total lease assets $ 2,321 $ 422 $ 1,106 $ 643 $ 463 $ 20 $ 62 $ 20 Liabilities Current Operating Other current liabilities $ 177 $ 20 $ 73 $ 31 $ 42 $ 1 $ 3 $ 4 Finance Current maturities of long-term debt 129 5 26 7 19 — — — Noncurrent Operating Operating lease liabilities 1,340 97 623 323 300 20 53 19 Finance Long-Term Debt 716 289 351 289 62 — 10 — Total lease liabilities $ 2,362 $ 411 $ 1,073 $ 650 $ 423 $ 21 $ 66 $ 23
Supplemental Lease Information	December 31, 2021 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Weighted average remaining lease term (years) Operating leases 9 9 8 10 7 16 16 4 Finance leases 10 18 13 13 11 — 24 — Weighted average discount rate (a) Operating leases 3.6 % 3.5 % 3.6 % 3.4 % 3.8 % 4.2 % 4.1 % 3.6 % Finance leases 7.3 % 11.6 % 9.0 % 9.0 % 8.2 % — % 11.9 % — % (a) The discount rate is calculated using the rate implicit in a lease if it is readily determinable. Generally, the rate used by the lessor is not provided to Duke Energy and in these cases the incremental borrowing rate is used. Duke Energy will typically use its fully collateralized incremental borrowing rate as of the commencement date to calculate and record the lease. The incremental borrowing rate is influenced by the lessee’s credit rating and lease term and as such may differ for individual leases, embedded leases or portfolios of leased assets. December 31, 2020 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Weighted average remaining lease term (years) Operating leases 10 9 10 12 8 17 18 5 Finance leases 13 19 15 17 11 — 25 — Weighted average discount rate (a) Operating leases 3.8 % 3.4 % 3.8 % 3.9 % 3.8 % 4.2 % 4.2 % 3.6 % Finance leases 8.4 % 11.6 % 11.9 % 12.4 % 8.2 % — % 11.9 % — % (a) The discount rate is calculated using the rate implicit in a lease if it is readily determinable. Generally, the rate used by the lessor is not provided to Duke Energy and in these cases the incremental borrowing rate is used. Duke Energy will typically use its fully collateralized incremental borrowing rate as of the commencement date to calculate and record the lease. The incremental borrowing rate is influenced by the lessee’s credit rating and lease term and as such may differ for individual leases, embedded leases or portfolios of leased assets.

Debt and Credit Facilities (Tab

Debt and Credit Facilities (Tables)	12 Months Ended
	Dec. 31, 2021
Debt Disclosure [Abstract]
Schedule of Debt	The following tables summarize outstanding debt. December 31, 2021 Weighted Average Duke Duke Duke Duke Duke Interest Duke Energy Progress Energy Energy Energy Energy (in millions) Rate Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Unsecured debt, maturing 2022-2082 3.71 % $ 24,564 $ 1,150 $ 2,250 $ — $ 150 $ 1,330 $ 700 $ 2,990 Secured debt, maturing 2022-2052 2.50 % 5,584 1,094 2,397 1,120 1,278 — — — First mortgage bonds, maturing 2022-2051 (a) 3.87 % 31,026 10,507 15,450 8,375 7,075 1,850 3,219 — Finance leases, maturing 2022-2051 (b) 5.81 % 915 289 690 629 61 — 10 — Tax-exempt bonds, maturing 2027-2041 (c) 0.65 % 360 — 48 48 — 27 285 — Notes payable and commercial paper (d) 0.35 % 3,929 — — — — — — — Money pool/intercompany borrowings — 526 2,959 322 199 128 150 518 Fair value hedge carrying value adjustment 4 4 — — — — — — Unamortized debt discount and premium, net (e) 1,119 (21) (34) (19) (14) (27) (18) (6) Unamortized debt issuance costs (f) (362) (67) (128) (54) (68) (13) (23) (16) Total debt 3.50 % $ 67,139 $ 13,482 $ 23,632 $ 10,421 $ 8,681 $ 3,295 $ 4,323 $ 3,486 Short-term notes payable and commercial paper (3,304) — — — — — — — Short-term money pool/intercompany borrowings — (226) (2,809) (172) (199) (103) — (518) Current maturities of long-term debt (g) (3,387) (362) (1,082) (556) (76) — (84) — Total long-term debt (g) $ 60,448 $ 12,894 $ 19,741 $ 9,693 $ 8,406 $ 3,192 $ 4,239 $ 2,968 (a) Substantially all electric utility property is mortgaged under mortgage bond indentures. (b) Duke Energy includes $256 million of finance lease purchase accounting adjustments related to Duke Energy Florida related to PPAs that are not accounted for as finance leases in their respective financial statements because of grandfathering provisions in GAAP. (c) Substantially all tax-exempt bonds are secured by first mortgage bonds, letters of credit or the Master Credit Facility. (d) Includes $625 million classified as Long-Term Debt on the Consolidated Balance Sheets due to the existence of long-term credit facilities that backstop these commercial paper balances, along with Duke Energy’s ability and intent to refinance these balances on a long-term basis. The weighted average days to maturity for Duke Energy's commercial paper program was 15 days. (e) Duke Energy includes $1,121 million and $100 million in purchase accounting adjustments related to Progress Energy and Piedmont, respectively. (f) Duke Energy includes $29 million in purchase accounting adjustments primarily related to the merger with Progress Energy. (g) Refer to Note 17 for additional information on amounts from consolidated VIEs. December 31, 2020 Weighted Average Duke Duke Duke Duke Duke Interest Duke Energy Progress Energy Energy Energy Energy (in millions) Rate Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Unsecured debt, maturing 2021-2078 3.71 % $ 23,669 $ 1,150 $ 3,150 $ 700 $ 350 $ 1,180 $ 403 $ 2,800 Secured debt, maturing 2021-2052 2.67 % 4,270 543 1,584 252 1,332 — — — First mortgage bonds, maturing 2021-2050 (a) 4.00 % 29,177 10,008 14,100 7,875 6,225 1,850 3,219 — Finance leases, maturing 2022-2051 (b) 6.96 % 845 294 377 296 81 — 10 — Tax-exempt bonds, maturing 2027-2041 (c) 0.75 % 477 — 48 48 — 77 352 — Notes payable and commercial paper (d) 0.51 % 3,407 — — — — — — — Money pool/intercompany borrowings — 806 3,119 445 196 194 281 530 Fair value hedge carrying value adjustment 4 4 — — — — — — Unamortized debt discount and premium, net (e) 1,217 (20) (31) (19) (11) (29) (18) (5) Unamortized debt issuance costs (f) (330) (62) (113) (44) (62) (14) (25) (15) Total debt 3.62 % $ 62,736 $ 12,723 $ 22,234 $ 9,553 $ 8,111 $ 3,258 $ 4,222 $ 3,310 Short-term notes payable and commercial paper (2,873) — — — — — — — Short-term money pool/intercompany borrowings — (506) (2,969) (295) (196) (169) (131) (530) Current maturities of long-term debt (g) (4,238) (506) (1,426) (603) (823) (50) (70) (160) Total long-term debt (g) $ 55,625 $ 11,711 $ 17,839 $ 8,655 $ 7,092 $ 3,039 $ 4,021 $ 2,620 (a) Substantially all electric utility property is mortgaged under mortgage bond indentures. (b) Duke Energy includes $24 million and $341 million of finance lease purchase accounting adjustments related to Duke Energy Progress and Duke Energy Florida, respectively, related to PPAs that are not accounted for as finance leases in their respective financial statements because of grandfathering provisions in GAAP. (c) Substantially all tax-exempt bonds are secured by first mortgage bonds, letters of credit or the Master Credit Facility. (d) Includes $625 million that was classified as Long-Term Debt on the Consolidated Balance Sheets due to the existence of long-term credit facilities that backstop these commercial paper balances, along with Duke Energy’s ability and intent to refinance these balances on a long-term basis. The weighted average days to maturity for Duke Energy's commercial paper programs was 23 days. (e) Duke Energy includes $1,196 million and $117 million in purchase accounting adjustments related to Progress Energy and Piedmont, respectively. (f) Duke Energy includes $33 million in purchase accounting adjustments primarily related to the merger with Progress Energy. (g) Refer to Note 17 for additional information on amounts from consolidated VIEs. The following table shows the significant components of Current maturities of Long-Term Debt on the Consolidated Balance Sheets. The Duke Energy Registrants currently anticipate satisfying these obligations with cash on hand and proceeds from additional borrowings. (in millions) Maturity Date Interest Rate December 31, 2021 Unsecured Debt (a) Duke Energy (Parent) March 2022 3.227 % 300 Duke Energy (Parent) (b) March 2022 0.851 % 300 Progress Energy April 2022 3.150 % 450 Duke Energy (Parent) August 2022 3.050 % 500 Duke Energy (Parent) August 2022 2.400 % 500 First Mortgage Bonds Duke Energy Indiana January 2022 8.850 % 53 Duke Energy Carolinas May 2022 3.350 % 350 Duke Energy Progress May 2022 2.800 % 500 Other (c) 434 Current maturities of long-term debt $ 3,387 (a) In December 2021, Duke Energy Progress early retired $700 million of unsecured debt with an original maturity date of February 2022. (b) Debt has a floating interest rate. (c) Includes finance lease obligations, amortizing debt and small bullet maturities. December 31, 2021 Duke Duke Duke Duke Duke Energy Energy Energy Energy (in millions) Energy Carolinas Progress Ohio Indiana Tax-exempt bonds $ 312 $ — $ — $ 27 $ 285 Commercial paper (a) 625 300 150 25 150 Total $ 937 $ 300 $ 150 $ 52 $ 435 December 31, 2020 Duke Duke Duke Duke Duke Energy Energy Energy Energy (in millions) Energy Carolinas Progress Ohio Indiana Tax-exempt bonds $ 312 $ — $ — $ 27 $ 285 Commercial paper (a) 625 300 150 25 150 Total $ 937 $ 300 $ 150 $ 52 $ 435 (a) Progress Energy amounts are equal to Duke Energy Progress amounts.
Schedule of Maturities of Long-term Debt	The following table shows the annual maturities of long-term debt for the next five years and thereafter. Amounts presented exclude short-term notes payable, commercial paper and money pool borrowings and debt issuance costs for the Subsidiary Registrants. December 31, 2021 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy (a) Carolinas Energy Progress Florida Ohio Indiana Piedmont 2022 $ 3,387 $ 362 $ 1,082 $ 556 $ 76 $ — $ 84 $ — 2023 4,725 1,018 1,046 719 327 475 303 45 2024 1,917 19 138 72 66 — 4 40 2025 3,078 496 639 575 64 245 4 205 2026 3,125 921 310 229 81 70 154 40 Thereafter 46,844 10,528 17,766 8,168 7,949 2,442 3,814 2,660 Total long-term debt, including current maturities $ 63,076 $ 13,344 $ 20,981 $ 10,319 $ 8,563 $ 3,232 $ 4,363 $ 2,990 (a) Excludes $1,250 million in purchase accounting adjustments related to the Progress Energy merger and the Piedmont acquisition.
Schedule of Long-term Debt Instruments	The following tables summarize significant debt issuances (in millions). Year Ended December 31, 2021 Duke Duke Duke Duke Maturity Interest Duke Energy Energy Energy Energy Issuance Date Date Rate Energy (Parent) Carolinas Progress Florida Piedmont Unsecured Debt March 2021 a) March 2031 2.500 % $ 350 $ — $ — $ — $ — $ 350 June 2021 (b)(c) June 2023 0.299 % 500 500 — — — — June 2021 (c) June 2031 2.550 % 1,000 1,000 — — — — June 2021 (c) June 2041 3.300 % 750 750 — — — — June 2021 (c) June 2051 3.500 % 750 750 — — — — September 2021 (d) January 2082 3.250 % 500 500 Secured Debt November 2021 (e) July 2031 1.679 % 100 — 100 — — — November 2021 (e) July 2041 2.617 % 137 — 137 — — — November 2021 (e) July 2028 1.295 % 221 — — 221 — — November 2021 (e) July 2037 2.387 % 352 — — 352 — — November 2021 (e) July 2041 2.799 % 197 — — 197 — — First Mortgage Bonds April 2021 (f) April 2031 2.550 % 550 — 550 — — — April 2021 (f) April 2051 3.450 % 450 — 450 — — — August 2021 (g) August 2031 2.000 % 650 — — 650 — — August 2021 (g) August 2051 2.900 % 450 — — 450 — — December 2021 (h) December 2031 2.400 % 650 — — — 650 — December 2021 (h) December 2051 3.000 % 500 — — — 500 — Total issuances $ 8,107 $ 3,500 $ 1,237 $ 1,870 $ 1,150 $ 350 (a) Debt issued to repay at maturity $160 million senior unsecured notes due June 2021, pay down short-term debt and for general corporate purposes. (b) Debt has a floating interest rate. (c) Debt issued to repay $1.75 billion of Duke Energy (Parent) debt maturities, to repay a portion of short-term debt and for general corporate purposes. (d) Debt issued to repay in October 2021 $500 million of Duke Energy (Parent) unsecured notes. The interest rate resets every five years. (e) Debt issued to finance the North Carolina portion of storm restoration expenditures related to Hurricane Florence, Hurricane Michael, Hurricane Dorian and Winter Storm Diego. (f) Debt issued to repay at maturity $500 million first mortgage bonds due June 2021, pay down short-term debt and for general company purposes. (g) Debt issued to repay at maturity a total of $600 million first mortgage bonds due September 2021, pay down short-term debt and for general company purposes. (h) Proceeds will be used to finance or refinance, in whole or in part, existing or new eligible projects under the sustainable financing framework. Year Ended December 31, 2020 Duke Duke Duke Duke Duke Duke Maturity Interest Duke Energy Energy Energy Energy Energy Energy Issuance Date Date Rate Energy (Parent) Carolinas Progress Florida Ohio Indiana Piedmont Unsecured Debt May 2020 (a) June 2030 2.450 % $ 500 $ 500 $ — $ — $ — $ — $ — $ — May 2020 (b) June 2050 3.350 % 400 — — — — — — 400 August 2020 (c)(d) February 2022 0.400 % 700 — — 700 — — — — September 2020 (e) September 2025 0.900 % 650 650 — — — — — — September 2020 (e) June 2030 2.450 % 350 350 — — — — — — First Mortgage Bonds January 2020 (f) February 2030 2.450 % 500 — 500 — — — — — January 2020 (f) August 2049 3.200 % 400 — 400 — — — — — March 2020 (g) April 2050 2.750 % 550 — — — — — 550 — May 2020 (b) June 2030 2.125 % 400 — — — — 400 — — June 2020 (b) June 2030 1.750 % 500 — — — 500 — — — August 2020 (h) August 2050 2.500 % 600 — — 600 — — — — Total issuances $ 5,550 $ 1,500 $ 900 $ 1,300 $ 500 $ 400 $ 550 $ 400 (a) Debt issued to repay $500 million borrowing made under Duke Energy (Parent) revolving credit facility in March 2020, and for general corporate purposes. (b) Debt issued to repay short-term debt and for general corporate purposes. (c) Debt issued to repay $700 million term loan due December 2020. (d) Debt issuance has a floating interest rate. (e) Debt issued to repay a portion of outstanding commercial paper, to repay a portion of Duke Energy (Parent)'s outstanding $1.7 billion term loan due March 2021 and for general corporate purposes. (f) Debt issued to repay at maturity $450 million first mortgage bonds due June 2020 and for general corporate purposes. (g) Debt issued to repay at maturity $500 million first mortgage bonds due July 2020 and to pay down short-term debt. (h) Debt issued to repay at maturity $300 million first mortgage bonds due September 2020 and for general corporate purposes.
Schedule Of Line Of Credit Facilities	The table below includes the current borrowing sublimits and available capacity under these credit facilities. December 31, 2021 Duke Duke Duke Duke Duke Duke Duke Energy Energy Energy Energy Energy Energy (in millions) Energy (Parent) Carolinas Progress Florida Ohio Indiana Piedmont Facility size (a) $ 8,000 $ 2,650 $ 1,225 $ 1,150 $ 900 $ 775 $ 600 $ 700 Reduction to backstop issuances Commercial paper (b) (2,863) (1,128) (506) (307) (181) (119) (150) (472) Outstanding letters of credit (38) (25) (4) (2) (7) — — — Tax-exempt bonds (81) — — — — — (81) — Available capacity $ 5,018 $ 1,497 $ 715 $ 841 $ 712 $ 656 $ 369 $ 228 (a) Represents the sublimit of each borrower. (b) Duke Energy issued $625 million of commercial paper and loaned the proceeds through the money pool to Duke Energy Carolinas, Duke Energy Progress, Duke Energy Ohio and Duke Energy Indiana. The balances are classified as Long-Term Debt Payable to Affiliated Companies in the Consolidated Balance Sheets.

Joint Ownership of Generating_2

Joint Ownership of Generating and Transmission Facilities (Tables)	12 Months Ended
	Dec. 31, 2021
Joint Ownership Of Generating And Transmission Facilities [Abstract]
Schedule Joint Ownership of Generating and Transmission Facilities	The following table presents the Duke Energy Registrants' interest of jointly owned plant or facilities and amounts included on the Consolidated Balance Sheets. All facilities are operated by the Duke Energy Registrants and are included in the Electric Utilities and Infrastructure segment. December 31, 2021 Construction Ownership Property, Plant Accumulated Work in (in millions except for ownership interest) Interest and Equipment Depreciation Progress Duke Energy Carolinas Catawba (units 1 and 2) (a) 19.25 % $ 1,044 $ 525 $ 20 W.S. Lee CC (b) 87.27 % 632 67 3 Duke Energy Indiana Gibson (unit 5) (c) 50.05 % 440 221 3 Vermillion (d) 62.50 % 175 108 5 Transmission and local facilities (c) Various 6,164 1,477 190 (a) Jointly owned with North Carolina Municipal Power Agency Number 1, NCEMC and PMPA. (b) Jointly owned with NCEMC. (c) Jointly owned with WVPA and IMPA. (d) Jointly owned with WVPA.

Asset Retirement Obligations (T

Asset Retirement Obligations (Tables)	12 Months Ended
	Dec. 31, 2021
Asset Retirement Obligation Disclosure [Abstract]
Schedule of Asset Retirement Obligations by Category	The following table presents the AROs recorded on the Consolidated Balance Sheets. December 31, 2021 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Decommissioning of nuclear power facilities (a) $ 7,046 $ 2,847 $ 4,156 $ 3,792 $ 364 $ — $ — $ — Closure of ash impoundments 5,293 2,390 1,872 1,839 33 82 949 — Other 437 64 84 44 40 54 38 22 Total asset retirement obligation $ 12,776 $ 5,301 $ 6,112 $ 5,675 $ 437 $ 136 $ 987 $ 22 Less: Current portion 647 249 275 274 1 13 110 — Total noncurrent asset retirement obligation $ 12,129 $ 5,052 $ 5,837 $ 5,401 $ 436 $ 123 $ 877 $ 22 (a) Duke Energy amount includes purchase accounting adjustments related to the merger with Progress Energy.
Public Utilities General Disclosures	The following table summarizes information about the most recent site-specific nuclear decommissioning cost studies. Decommissioning costs are stated in 2018 or 2019 dollars, depending on the year of the cost study, and include costs to decommission plant components not subject to radioactive contamination. Annual Funding Decommissioning (in millions) Requirement (a) Costs (a) Year of Cost Study Duke Energy $ 15 $ 9,105 2018 or 2019 Duke Energy Carolinas (b)(c) — 4,365 2018 Duke Energy Progress (d) 15 4,181 2019 Duke Energy Florida (e) — 559 N/A (a) Amount represents annual funding requirement for the current fiscal year. Amounts for Progress Energy equal the sum of Duke Energy Progress and Duke Energy Florida. (b) Decommissioning costs for Duke Energy Carolinas reflects its ownership interest in jointly owned reactors. Other joint owners are responsible for decommissioning costs related to their interest in the reactors. (c) Duke Energy Carolinas' site-specific nuclear decommissioning cost study completed in 2018 was filed with the NCUC and PSCSC in 2019. A new funding study was also completed and filed with the NCUC and PSCSC in 2019. (d) Duke Energy Progress' site-specific nuclear decommissioning cost study completed in 2019 was filed with the NCUC and PSCSC in March 2020. Duke Energy Progress also completed a funding study, which was filed with the NCUC and PSCSC in July 2020. In October 2021, Duke Energy Progress filed the 2019 nuclear decommissioning cost study with the FERC, as well as a revised rate schedule for decommissioning expense to be collected from wholesale customers. The FERC accepted the filing, as filed on December 9, 2021. (e) During 2019, Duke Energy Florida reached an agreement to transfer decommissioning work for Crystal River Unit 3 to a third party and decommissioning costs are based on the agreement with this third party rather than a cost study. Regulatory approval was received from the NRC and the FPSC in April 2020 and August 2020, respectively. The following table presents the fair value of NDTF assets legally restricted for purposes of settling AROs associated with nuclear decommissioning. Duke Energy Florida entered into an agreement with a third party to decommission Crystal River Unit 3 and was granted an exemption from the NRC, which allows for use of the NDTF for all aspects of nuclear decommissioning. The entire balance of Duke Energy Florida's NDTF may be applied toward license termination, spent fuel and site restoration costs incurred to decommission Crystal River Unit 3 and is excluded from the table below. See Note 16 for additional information related to the fair value of the Duke Energy Registrants' NDTFs. December 31, (in millions) 2021 2020 Duke Energy $ 8,933 $ 7,726 Duke Energy Carolinas 5,068 4,381 Duke Energy Progress 3,865 3,345 Unit Year of Expiration Duke Energy Carolinas Catawba Units 1 and 2 2043 McGuire Unit 1 2041 McGuire Unit 2 2043 Oconee Units 1 and 2 2033 Oconee Unit 3 2034 Duke Energy Progress Brunswick Unit 1 2036 Brunswick Unit 2 2034 Harris 2046 Robinson 2030
Rollforward Schedule of Asset Retirement Obligations	The following tables present changes in the liability associated with AROs. Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Balance at December 31, 2019 $ 13,318 $ 5,734 $ 6,471 $ 5,893 $ 578 $ 80 $ 832 $ 17 Accretion expense (a) 542 258 246 225 21 4 33 1 Liabilities settled (b) (724) (198) (451) (358) (93) (2) (74) — Liabilities incurred in the current year 22 — 5 — 5 — — — Revisions in estimates of cash flows (c) (154) (444) (122) (125) 3 29 385 2 Balance at December 31, 2020 13,004 5,350 6,149 5,635 514 111 1,176 20 Accretion expense (a) 512 242 229 212 17 4 35 1 Liabilities settled (b) (613) (210) (324) (214) (110) (3) (77) — Liabilities incurred in the current year 32 8 6 — 6 — — — Revisions in estimates of cash flows (c) (159) (89) 52 42 10 24 (147) 1 Balance at December 31, 2021 $ 12,776 $ 5,301 $ 6,112 $ 5,675 $ 437 $ 136 $ 987 $ 22 (a) Substantially all accretion expense for the years ended December 31, 2021, and 2020, relates to Duke Energy’s regulated operations and has been deferred in accordance with regulatory accounting treatment. (b) Amounts primarily relate to ash impoundment closures and nuclear decommissioning. (c) Primarily relates to decreases due to revised basin closure cost estimates, partially offset by increases related to new closure plan approvals, post closure maintenance and beneficiation costs. Duke Energy Indiana estimates also include the impacts of closure estimates for certain ash impoundments due to the impact of Hoosier Environmental Council’s petition filed with the court challenging the Indiana Department of Environmental Management’s partial approval of Duke Energy Indiana’s ash pond closure plan. See Note 4 for more information on Hoosier Environmental Council's petition. The amounts recorded represent the discounted cash flows for estimated closure costs based upon the probability weightings of the potential closure methods as evaluated on a site-by-site basis.

Property, Plant and Equipment (

Property, Plant and Equipment (Tables)	12 Months Ended
	Dec. 31, 2021
Property, Plant and Equipment [Abstract]
Schedule of Property, Plant and Equipment	The composite weighted average depreciation rates, excluding nuclear fuel, are included in the table that follows. Years Ended December 31, 2021 2020 2019 Duke Energy 2.9 % 3.0 % 3.1 % Duke Energy Carolinas 2.7 % 2.8 % 2.8 % Progress Energy 3.1 % 3.2 % 3.1 % Duke Energy Progress 3.0 % 3.1 % 3.1 % Duke Energy Florida 3.3 % 3.3 % 3.1 % Duke Energy Ohio 2.9 % 2.9 % 2.6 % Duke Energy Indiana 3.6 % 3.5 % 3.3 % Piedmont 2.1 % 2.3 % 2.4 % The following tables summarize the property, plant and equipment for Duke Energy and its subsidiary registrants. December 31, 2021 Average Remaining Duke Duke Duke Duke Duke Useful Life Duke Energy Progress Energy Energy Energy Energy (in millions) (Years) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Land $ 2,162 $ 543 $ 957 $ 482 $ 475 $ 219 $ 122 $ 279 Plant – Regulated Electric generation, distribution and transmission 40 120,855 44,910 53,447 32,417 21,030 6,573 15,925 — Natural gas transmission and distribution 54 12,079 — — — — 3,347 — 8,732 Other buildings and improvements 37 1,921 550 514 228 286 381 321 155 Plant – Nonregulated Electric generation, distribution and transmission 28 7,104 — — — — — — — Other buildings and improvements 11 401 — — — — — — — Nuclear fuel 3,181 1,856 1,325 1,325 — — — — Equipment 13 2,659 614 791 497 294 403 262 122 Construction in process 6,168 2,078 2,297 954 1,343 515 460 262 Other 14 5,289 1,323 1,563 1,115 437 287 253 368 Total property, plant and equipment (a)(e) 161,819 51,874 60,894 37,018 23,865 11,725 17,343 9,918 Total accumulated depreciation – regulated (b)(c) (47,611) (17,854) (19,214) (13,387) (5,819) (3,106) (5,583) (1,899) Total accumulated depreciation – nonregulated (d)(e) (2,944) — — — — — — — Facilities to be retired, net 144 102 26 26 — 6 — 11 Total net property, plant and equipment $ 111,408 $ 34,122 $ 41,706 $ 23,657 $ 18,046 $ 8,625 $ 11,760 $ 8,030 (a) Includes finance leases of $958 million, $335 million, $729 million, $627 million, $102 million and $10 million at Duke Energy, Duke Energy Carolinas, Progress Energy, Duke Energy Progress, Duke Energy Florida and Duke Energy Indiana, respectively, primarily within Plant – Regulated. The Progress Energy, Duke Energy Progress and Duke Energy Florida amounts are net of $178 million, $45 million and $133 million, respectively, of accumulated amortization of finance leases. (b) Includes $1,799 million, $1,064 million, $735 million and $735 million of accumulated amortization of nuclear fuel at Duke Energy, Duke Energy Carolinas, Progress Energy and Duke Energy Progress, respectively. (c) Includes accumulated amortization of finance leases of $9 million, $33 million and $3 million at Duke Energy, Duke Energy Carolinas and Duke Energy Indiana, respectively. (d) Includes accumulated amortization of finance leases of ($1 million) at Duke Energy. (e) Includes gross property, plant and equipment cost of consolidated VIEs of $7,339 million and accumulated depreciation of consolidated VIEs of $1,474 million at Duke Energy. December 31, 2020 Average Remaining Duke Duke Duke Duke Duke Useful Life Duke Energy Progress Energy Energy Energy Energy (in millions) (Years) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Land $ 2,046 $ 536 $ 908 $ 463 $ 445 $ 171 $ 118 $ 279 Plant – Regulated Electric generation, distribution and transmission 39 117,107 44,059 50,785 31,375 19,410 6,255 16,008 — Natural gas transmission and distribution 54 10,799 — — — — 3,136 — 7,663 Other buildings and improvements 36 2,038 740 459 197 262 374 300 165 Plant – Nonregulated Electric generation, distribution and transmission 27 5,444 — — — — — — — Other buildings and improvements 10 519 — — — — — — — Nuclear fuel 3,284 1,837 1,447 1,447 — — — — Equipment 15 2,608 620 759 498 261 385 238 122 Construction in process 6,645 1,645 2,013 709 1,304 407 409 581 Other 14 5,090 1,203 1,521 1,070 441 294 309 324 Total property, plant and equipment (a)(e) 155,580 50,640 57,892 35,759 22,123 11,022 17,382 9,134 Total accumulated depreciation – regulated (b)(c) (46,216) (17,453) (18,368) (12,801) (5,560) (3,013) (5,661) (1,749) Total accumulated depreciation – nonregulated (d)(e) (2,611) — — — — — — — Facilities to be retired, net 29 — 29 29 — — — — Total net property, plant and equipment $ 106,782 $ 33,187 $ 39,553 $ 22,987 $ 16,563 $ 8,009 $ 11,721 $ 7,385 (a) Includes finance leases of $832 million, $335 million, $416 million, $297 million, $119 million, and $10 million at Duke Energy, Duke Energy Carolinas, Progress Energy, Duke Energy Progress, Duke Energy Florida and Duke Energy Indiana, respectively, primarily within Plant – Regulated. The Progress Energy, Duke Energy Progress and Duke Energy Florida amounts are net of $141 million, $24 million and $117 million, respectively, of accumulated amortization of finance leases. (b) Includes $1,832 million, $1,010 million, $822 million and $822 million of accumulated amortization of nuclear fuel at Duke Energy, Duke Energy Carolinas, Progress Energy and Duke Energy Progress, respectively. (c) Includes accumulated amortization of finance leases of $12 million, $23 million, and $3 million at Duke Energy, Duke Energy Carolinas and Duke Energy Indiana, respectively. (d) Includes accumulated amortization of finance leases of $23 million at Duke Energy. (e) Includes gross property, plant and equipment cost of consolidated VIEs of $6,394 million and accumulated depreciation of consolidated VIEs of $1,242 million at Duke Energy.
Schedule Of Capitalized Interest	The following table presents capitalized interest, which includes the debt component of AFUDC. Years Ended December 31, (in millions) 2021 2020 2019 Duke Energy $ 72 $ 112 $ 159 Duke Energy Carolinas 29 28 30 Progress Energy 20 17 31 Duke Energy Progress 14 12 28 Duke Energy Florida 6 5 3 Duke Energy Ohio 20 26 22 Duke Energy Indiana (a) (17) 10 26 Piedmont 9 8 26 (a) Duke Energy Indiana is primarily compromised of ($24 million) of PISCC amortization, which is partially offset by $7 million of the debt component of AFUDC.

Goodwill and Intangible Assets

Goodwill and Intangible Assets (Tables)	12 Months Ended
	Dec. 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill By Reportable Operating Segment	The following table presents goodwill by reportable segment for Duke Energy included on Duke Energy's Consolidated Balance Sheets at December 31, 2021, and 2020. Electric Utilities Gas Utilities Commercial (in millions) and Infrastructure and Infrastructure Renewables Total Goodwill Balance at December 31, 2020 $ 17,379 $ 1,924 $ 122 $ 19,425 Accumulated impairment charges — — (122) (122) Goodwill balance at December 31, 2020, adjusted for accumulated impairment charges $ 17,379 $ 1,924 $ — $ 19,303 Goodwill Balance at December 31, 2021 $ 17,379 $ 1,924 $ 122 $ 19,425 Accumulated impairment charges — — (122) (122) Goodwill balance at December 31, 2021, adjusted for accumulated impairment charges $ 17,379 $ 1,924 $ — $ 19,303
Schedule of Intangible Assets	The following tables show the carrying amount and accumulated amortization of intangible assets included in Other within Other Noncurrent Assets on the Consolidated Balance Sheets of the Duke Energy Registrants at December 31, 2021, and 2020. December 31, 2021 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Emission allowances $ 8 $ — $ 5 $ 2 $ 3 $ — $ 2 $ — Renewable energy certificates 204 73 131 131 — — — — Natural gas, coal and power contracts 24 — — — — — 24 — Renewable operating and development projects 106 — — — — — — — Other 28 — — — — — — — Total gross carrying amounts 370 73 136 133 3 — 26 — Accumulated amortization – natural gas, coal and power contracts (24) — — — — — (24) — Accumulated amortization – renewable operating and development projects (38) — — — — — — — Accumulated amortization – other (4) — — — — — — — Total accumulated amortization (66) — — — — — (24) — Total intangible assets, net $ 304 $ 73 $ 136 $ 133 $ 3 $ — $ 2 $ — December 31, 2020 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Emission allowances $ 8 $ — $ 5 $ 2 $ 3 $ — $ 2 $ — Renewable energy certificates 196 65 130 130 — 1 — — Natural gas, coal and power contracts 24 — — — — — 24 — Renewable operating and development projects 107 — — — — — — — Other 20 — — — — — — — Total gross carrying amounts 355 65 135 132 3 1 26 — Accumulated amortization – natural gas, coal and power contracts (23) — — — — — (23) — Accumulated amortization – renewable operating and development projects (34) — — — — — — — Accumulated amortization – other (3) — — — — — — — Total accumulated amortization (60) — — — — — (23) — Total intangible assets, net $ 295 $ 65 $ 135 $ 132 $ 3 $ 1 $ 3 $ —

Investments in Unconsolidated_2

Investments in Unconsolidated Affiliates (Tables)	12 Months Ended
	Dec. 31, 2021
Investments In Unconsolidated Affiliates [Line Items]
Investments in Equity Method Unconsolidated Affiliates	The following table presents Duke Energy’s investments in unconsolidated affiliates accounted for under the equity method, as well as the respective equity in earnings, by segment, for periods presented in this filing. Years Ended December 31, 2021 2020 2019 Equity in Equity in Equity in earnings earnings earnings (in millions) Investments (losses) Investments (losses) (losses) Electric Utilities and Infrastructure $ 104 $ 7 $ 105 $ (1) $ 9 Gas Utilities and Infrastructure 231 8 215 (2,017) 114 Commercial Renewables 513 (34) 534 — (4) Other 122 47 107 13 43 Total $ 970 $ 28 $ 961 $ (2,005) $ 162
ACP
Investments In Unconsolidated Affiliates [Line Items]
Investments in Equity Method Unconsolidated Affiliates	For the year ended December 31, 2020, Duke Energy's investment in ACP met the requirements of S-X Rule 4-08(g) to provide summarized financial information. The following table provides summary information for ACP as required under S-X Rule 1-02(bb) for the period of significance and comparative prior year periods in Duke Energy's consolidated balance sheets and consolidated statements of operations. For the year ended December 31, 2021, there were no investments that met the significance requirements. (in millions) December 31, 2020 Current assets $ 43 Noncurrent assets 93 Current liabilities 1,965 Noncurrent liabilities 167 Membership interests (1,996) Years Ended December 31, 2020 2019 Net revenues $ — $ — Operating loss (4,612) (5) Net (loss) income (4,512) 246 Net (loss) income attributable to Duke Energy $ (2,121) $ 116

Related Party Transactions (Tab

Related Party Transactions (Tables)	12 Months Ended
	Dec. 31, 2021
Related Party Transactions [Abstract]
Related Party Transactions, Other Revenue and Expense	Material amounts related to transactions with related parties included in the Consolidated Statements of Operations and Comprehensive Income are presented in the following table. Years Ended December 31, (in millions) 2021 2020 2019 Duke Energy Carolinas Corporate governance and shared service expenses (a) $ 894 $ 753 $ 841 Indemnification coverages (b) 24 20 20 Joint Dispatch Agreement (JDA) revenue (c) 41 25 60 JDA expense (c) 207 114 186 Intercompany natural gas purchases (d) 11 15 15 Progress Energy Corporate governance and shared service expenses (a) $ 856 $ 715 $ 778 Indemnification coverages (b) 41 36 37 JDA revenue (c) 207 114 186 JDA expense (c) 41 25 60 Intercompany natural gas purchases (d) 75 75 76 Duke Energy Progress Corporate governance and shared service expenses (a) $ 504 $ 420 $ 462 Indemnification coverages (b) 19 17 15 JDA revenue (c) 207 114 186 JDA expense (c) 41 25 60 Intercompany natural gas purchases (d) 75 75 76 Duke Energy Florida Corporate governance and shared service expenses (a) $ 352 $ 295 $ 316 Indemnification coverages (b) 22 19 22 Duke Energy Ohio Corporate governance and shared service expenses (a) $ 329 $ 326 $ 354 Indemnification coverages (b) 4 4 4 Duke Energy Indiana Corporate governance and shared service expenses (a) $ 409 $ 401 $ 412 Indemnification coverages (b) 8 8 7 Piedmont Corporate governance and shared service expenses (a) $ 139 $ 140 $ 138 Indemnification coverages (b) 3 3 3 Intercompany natural gas sales (d) 86 90 91 Natural gas storage and transportation costs (e) 22 23 23 (a) The Subsidiary Registrants are charged their proportionate share of corporate governance and other shared services costs, primarily related to human resources, employee benefits, information technology, legal and accounting fees, as well as other third-party costs. These amounts are primarily recorded in Operation, maintenance and other on the Consolidated Statements of Operations and Comprehensive Income. (b) The Subsidiary Registrants incur expenses related to certain indemnification coverages through Bison, Duke Energy’s wholly owned captive insurance subsidiary. These expenses are recorded in Operation, maintenance and other on the Consolidated Statements of Operations and Comprehensive Income. (c) Duke Energy Carolinas and Duke Energy Progress participate in a JDA, which allows the collective dispatch of power plants between the service territories to reduce customer rates. Revenues from the sale of power and expenses from the purchase of power pursuant to the JDA are recorded in Operating Revenues and Fuel used in electric generation and purchased power, respectively, on the Consolidated Statements of Operations and Comprehensive Income. (d) Piedmont provides long-term natural gas delivery service to certain Duke Energy Carolinas and Duke Energy Progress natural gas-fired generation facilities. Piedmont records the sales in Operating Revenues, and Duke Energy Carolinas and Duke Energy Progress record the related purchases as a component of Fuel used in electric generation and purchased power on their respective Consolidated Statements of Operations and Comprehensive Income. These intercompany revenues and expenses are eliminated in consolidation. (e) Piedmont has related party transactions as a customer of its equity method investments in Pine Needle, Hardy Storage, and Cardinal natural gas storage and transportation facilities. These expenses are included in Cost of natural gas on Piedmont's Consolidated Statements of Operations and Comprehensive Income. Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Carolinas Energy Progress Florida Ohio Indiana Piedmont December 31, 2021 Intercompany income tax receivable $ — $ — $ — $ 40 $ 19 $ — $ — Intercompany income tax payable 62 — 84 — — 10 27 December 31, 2020 Intercompany income tax receivable $ — $ — $ — $ — $ — $ 9 $ 10 Intercompany income tax payable 31 33 46 35 2 — —

Derivatives and Hedging (Tables

Derivatives and Hedging (Tables)	12 Months Ended
	Dec. 31, 2021
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Notional Amounts of Outstanding Derivative Positions	The following tables show notional amounts of outstanding derivatives related to interest rate risk. December 31, 2021 Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy (in millions) Energy Carolinas Energy Progress Indiana Ohio Cash flow hedges $ 2,415 $ — $ — $ — $ — $ — Undesignated contracts 1,177 350 500 500 300 27 Total notional amount (a) $ 3,592 $ 350 $ 500 $ 500 $ 300 $ 27 December 31, 2020 Duke Duke Duke Duke Energy Progress Energy Energy (in millions) Energy Carolinas Energy Progress Ohio Cash flow hedges $ 632 $ — $ — $ — $ — Undesignated contracts 1,177 400 750 750 27 Total notional amount (a) $ 1,809 $ 400 $ 750 $ 750 $ 27 (a) Duke Energy includes amounts related to consolidated VIEs of $665 million in cash flow hedges as of December 31, 2021, and $632 million in cash flow hedges as of December 31, 2020. The tables below include volumes of outstanding commodity derivatives. Amounts disclosed represent the absolute value of notional volumes of commodity contracts excluding NPNS. The Duke Energy Registrants have netted contractual amounts where offsetting purchase and sale contracts exist with identical delivery locations and times of delivery. Where all commodity positions are perfectly offset, no quantities are shown. December 31, 2021 Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy Carolinas Energy Progress Ohio Indiana Piedmont Electricity (GWh) (a) 22,344 — — — 1,681 10,688 — Natural gas (millions of Dth) 823 264 215 215 — 8 336 December 31, 2020 Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy Carolinas Energy Progress Ohio Indiana Piedmont Electricity (GWh) (a) 35,409 — — — 2,559 10,802 — Natural gas (millions of Dth) 678 145 158 158 — 2 373 (a) Duke Energy includes 9,975 GWh and 22,048 GWh related to cash flow hedges as of December 31, 2021, and 2020, respectively.
Location and Fair Value of Derivatives Recognized in the Consolidated Balance Sheets	The following tables show the fair value and balance sheet location of derivative instruments. Although derivatives subject to master netting arrangements are netted on the Consolidated Balance Sheets, the fair values presented below are shown gross and cash collateral on the derivatives has not been netted against the fair values shown. Derivative Assets December 31, 2021 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Commodity Contracts Not Designated as Hedging Instruments Current $ 199 $ 99 $ 72 $ 72 $ — $ 2 $ 23 $ 3 Noncurrent 113 63 50 50 — — — — Total Derivative Assets – Commodity Contracts $ 312 $ 162 $ 122 $ 122 $ — $ 2 $ 23 $ 3 Interest Rate Contracts Designated as Hedging Instruments Current $ 3 $ — $ — $ — $ — $ — $ — $ — Noncurrent 3 — — — — — — — Not Designated as Hedging Instruments Current $ 2 $ — $ 2 $ 2 $ — $ — $ — $ — Total Derivative Assets – Interest Rate Contracts $ 8 $ — $ 2 $ 2 $ — $ — $ — $ — Total Derivative Assets $ 320 $ 162 $ 124 $ 124 $ — $ 2 $ 23 $ 3 Derivative Liabilities December 31, 2021 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Commodity Contracts Designated as Hedging Instruments Current $ 27 $ — $ — $ — $ — $ — $ — $ — Noncurrent 117 — — — — — — — Not Designated as Hedging Instruments Current $ 72 $ 18 $ 19 $ 5 $ 14 $ — $ 13 $ 21 Noncurrent 132 9 5 5 — — — 118 Total Derivative Liabilities – Commodity Contracts $ 348 $ 27 $ 24 $ 10 $ 14 $ — $ 13 $ 139 Interest Rate Contracts Designated as Hedging Instruments Current $ 75 $ — $ — $ — $ — $ — $ — $ — Noncurrent 21 — — — — — — — Not Designated as Hedging Instruments Current 10 8 — — — 1 — — Noncurrent 18 — — — — 4 14 — Total Derivative Liabilities – Interest Rate Contracts $ 124 $ 8 $ — $ — $ — $ 5 $ 14 $ — Total Derivative Liabilities $ 472 $ 35 $ 24 $ 10 $ 14 $ 5 $ 27 $ 139 Derivative Assets December 31, 2020 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Commodity Contracts Not Designated as Hedging Instruments Current $ 30 $ 14 $ 9 $ 9 $ — $ 1 $ 6 $ 1 Noncurrent 13 6 6 6 — — — — Total Derivative Assets – Commodity Contracts $ 43 $ 20 $ 15 $ 15 $ — $ 1 $ 6 $ 1 Interest Rate Contracts Not Designated as Hedging Instruments Current $ 18 $ — $ 18 $ 18 $ — $ — $ — $ — Total Derivative Assets – Interest Rate Contracts $ 18 $ — $ 18 $ 18 $ — $ — $ — $ — Total Derivative Assets $ 61 $ 20 $ 33 $ 33 $ — $ 1 $ 6 $ 1 Derivative Liabilities December 31, 2020 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Commodity Contracts Designated as Hedging Instruments Current $ 14 $ — $ — $ — $ — $ — $ — $ — Noncurrent 70 — — — — — — — Not Designated as Hedging Instruments Current $ 30 $ 13 $ 2 $ 2 $ — $ — $ 1 $ 15 Noncurrent 137 3 27 12 — — — 107 Total Derivative Liabilities – Commodity Contracts $ 251 $ 16 $ 29 $ 14 $ — $ — $ 1 $ 122 Interest Rate Contracts Designated as Hedging Instruments Current $ 15 $ — $ — $ — $ — $ — $ — $ — Noncurrent 48 — — — — — — — Not Designated as Hedging Instruments Current 5 4 — — — 1 — — Noncurrent 5 — — — — 5 — — Total Derivative Liabilities – Interest Rate Contracts $ 73 $ 4 $ — $ — $ — $ 6 $ — $ — Total Derivative Liabilities $ 324 $ 20 $ 29 $ 14 $ — $ 6 $ 1 $ 122
Offsetting Assets	The following tables present the line items on the Consolidated Balance Sheets where derivatives are reported. Substantially all of Duke Energy's outstanding derivative contracts are subject to enforceable master netting arrangements. The gross amounts offset in the tables below show the effect of these netting arrangements on financial position and include collateral posted to offset the net position. The amounts shown are calculated by counterparty. Accounts receivable or accounts payable may also be available to offset exposures in the event of bankruptcy. These amounts are not included in the tables below. Derivative Assets December 31, 2021 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Current Gross amounts recognized $ 204 $ 99 $ 74 $ 74 $ — $ 2 $ 23 $ 3 Gross amounts offset (25) (16) (9) (9) — — — — Net amounts presented in Current Assets: Other $ 179 $ 83 $ 65 $ 65 $ — $ 2 $ 23 $ 3 Noncurrent Gross amounts recognized $ 116 $ 63 $ 50 $ 50 $ — $ — $ — $ — Gross amounts offset (23) (15) (8) (8) — — — — Net amounts presented in Other Noncurrent Assets: Other $ 93 $ 48 $ 42 $ 42 $ — $ — $ — $ — Derivative Assets December 31, 2020 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Current Gross amounts recognized $ 48 $ 14 $ 27 $ 27 $ — $ 1 $ 6 $ 1 Gross amounts offset (3) (2) (2) (2) — — — — Net amounts presented in Current Assets: Other $ 45 $ 12 $ 25 $ 25 $ — $ 1 $ 6 $ 1 Noncurrent Gross amounts recognized $ 13 $ 6 $ 6 $ 6 $ — $ — $ — $ — Gross amounts offset (5) (1) (4) (4) — — — — Net amounts presented in Other Noncurrent Assets: Other $ 8 $ 5 $ 2 $ 2 $ — $ — $ — $ —
Offsetting Liabilities	Derivative Liabilities December 31, 2021 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Current Gross amounts recognized $ 184 $ 26 $ 19 $ 5 $ 14 $ 1 $ 13 $ 21 Gross amounts offset (11) (6) (5) (5) — — — — Net amounts presented in Current Liabilities: Other $ 173 $ 20 $ 14 $ — $ 14 $ 1 $ 13 $ 21 Noncurrent Gross amounts recognized $ 288 $ 9 $ 5 $ 5 $ — $ 4 $ 14 $ 118 Gross amounts offset (12) (8) (5) (5) — — — — Net amounts presented in Other Noncurrent Liabilities: Other $ 276 $ 1 $ — $ — $ — $ 4 $ 14 $ 118 Derivative Liabilities December 31, 2020 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Current Gross amounts recognized $ 64 $ 17 $ 2 $ 2 $ — $ 1 $ 1 $ 15 Gross amounts offset (3) (2) (2) (2) — — — — Net amounts presented in Current Liabilities: Other $ 61 $ 15 $ — $ — $ — $ 1 $ 1 $ 15 Noncurrent Gross amounts recognized $ 260 $ 3 $ 27 $ 12 $ — $ 5 $ — $ 107 Gross amounts offset (5) (1) (4) (4) — — — — Net amounts presented in Other Noncurrent Liabilities: Other $ 255 $ 2 $ 23 $ 8 $ — $ 5 $ — $ 107

Investments in Debt and Equit_2

Investments in Debt and Equity Securities (Tables)	12 Months Ended
	Dec. 31, 2021
Investment [Line Items]
Summary of Investments in Debt and Equity Securities	The following table presents the estimated fair value of investments in debt and equity securities; equity investments are classified as FV-NI and debt investments are classified as AFS. December 31, 2021 December 31, 2020 Gross Gross Gross Gross Unrealized Unrealized Unrealized Unrealized Holding Holding Estimated Holding Holding Estimated (in millions) Gains Losses Fair Value Gains Losses Fair Value NDTF Cash and cash equivalents $ — $ — $ 160 $ — $ — $ 177 Equity securities 4,905 43 7,350 4,138 54 6,235 Corporate debt securities 39 6 829 76 1 806 Municipal bonds 14 1 314 22 — 370 U.S. government bonds 31 12 1,568 51 — 1,361 Other debt securities 3 1 180 8 — 180 Total NDTF Investments $ 4,992 $ 63 $ 10,401 $ 4,295 $ 55 $ 9,129 Other Investments Cash and cash equivalents $ — $ — $ 36 $ — $ — $ 127 Equity securities 36 — 156 79 — 146 Corporate debt securities 2 1 119 8 — 110 Municipal bonds 3 1 80 5 — 86 U.S. government bonds — — 56 — — 42 Other debt securities — 1 45 — — 47 Total Other Investments $ 41 $ 3 $ 492 $ 92 $ — $ 558 Total Investments $ 5,033 $ 66 $ 10,893 $ 4,387 $ 55 $ 9,687
Schedule of Realized Gain (Loss)	Realized gains and losses, which were determined on a specific identification basis, from sales of FV-NI and AFS securities for the years ended December 31, 2021, 2020 and 2019, were as follows. Years Ended December 31, (in millions) 2021 2020 2019 FV-NI: Realized gains $ 724 $ 366 $ 172 Realized losses 141 174 151 AFS: Realized gains 56 96 94 Realized losses 54 51 67
Investments Classified by Contractual Maturity Date	The table below summarizes the maturity date for debt securities. December 31, 2021 Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Indiana Due in one year or less $ 159 $ 3 $ 138 $ 31 $ 107 $ 7 Due after one through five years 957 337 546 256 290 25 Due after five through 10 years 550 226 248 231 17 10 Due after 10 years 1,525 875 544 507 37 22 Total $ 3,191 $ 1,441 $ 1,476 $ 1,025 $ 451 $ 64
Duke Energy Carolinas
Investment [Line Items]
Summary of Investments in Debt and Equity Securities	The following table presents the estimated fair value of investments in debt and equity securities; equity investments are classified as FV-NI and debt investments are classified as AFS. December 31, 2021 December 31, 2020 Gross Gross Gross Gross Unrealized Unrealized Unrealized Unrealized Holding Holding Estimated Holding Holding Estimated (in millions) Gains Losses Fair Value Gains Losses Fair Value NDTF Cash and cash equivalents $ — $ — $ 53 $ — $ — $ 30 Equity securities 2,887 19 4,265 2,442 23 3,685 Corporate debt securities 24 4 506 49 1 510 Municipal bonds 2 — 48 6 — 91 U.S. government bonds 16 3 712 25 — 475 Other debt securities 3 1 175 7 — 174 Total NDTF Investments $ 2,932 $ 27 $ 5,759 $ 2,529 $ 24 $ 4,965
Schedule of Realized Gain (Loss)	Realized gains and losses, which were determined on a specific identification basis, from sales of FV-NI and AFS securities for the years ended December 31, 2021, 2020 and 2019, were as follows. Years Ended December 31, (in millions) 2021 2020 2019 FV-NI: Realized gains $ 440 $ 64 $ 113 Realized losses 96 99 107 AFS: Realized gains 38 60 55 Realized losses 37 37 38
Progress Energy
Investment [Line Items]
Summary of Investments in Debt and Equity Securities	The following table presents the estimated fair value of investments in debt and equity securities; equity investments are classified as FV-NI and debt investments are classified as AFS. December 31, 2021 December 31, 2020 Gross Gross Gross Gross Unrealized Unrealized Unrealized Unrealized Holding Holding Estimated Holding Holding Estimated (in millions) Gains Losses Fair Value Gains Losses Fair Value NDTF Cash and cash equivalents $ — $ — $ 107 $ — $ — $ 147 Equity securities 2,018 24 3,085 1,696 31 2,550 Corporate debt securities 15 2 323 27 — 296 Municipal bonds 12 1 266 16 — 279 U.S. government bonds 15 9 856 26 — 886 Other debt securities — — 5 1 — 6 Total NDTF Investments $ 2,060 $ 36 $ 4,642 $ 1,766 $ 31 $ 4,164 Other Investments Cash and cash equivalents $ — $ — $ 20 $ — $ — $ 106 Municipal bonds 2 — 26 3 — 26 Total Other Investments $ 2 $ — $ 46 $ 3 $ — $ 132 Total Investments $ 2,062 $ 36 $ 4,688 $ 1,769 $ 31 $ 4,296
Schedule of Realized Gain (Loss)	Realized gains and losses, which were determined on a specific identification basis, from sales of FV-NI and AFS securities for the years ended December 31, 2021, 2020 and 2019, were as follows. Years Ended December 31, (in millions) 2021 2020 2019 FV-NI: Realized gains $ 284 $ 302 $ 59 Realized losses 45 75 44 AFS: Realized gains 16 24 36 Realized losses 14 13 29
Duke Energy Progress
Investment [Line Items]
Summary of Investments in Debt and Equity Securities	The following table presents the estimated fair value of investments in debt and equity securities; equity investments are classified as FV-NI and debt investments are classified as AFS. December 31, 2021 December 31, 2020 Gross Gross Gross Gross Unrealized Unrealized Unrealized Unrealized Holding Holding Estimated Holding Holding Estimated (in millions) Gains Losses Fair Value Gains Losses Fair Value NDTF Cash and cash equivalents $ — $ — $ 94 $ — $ — $ 76 Equity securities 1,915 23 2,970 1,617 31 2,459 Corporate debt securities 15 2 282 27 — 296 Municipal bonds 12 1 266 16 — 279 U.S. government bonds 15 3 472 26 — 412 Other debt securities — — 5 1 — 6 Total NDTF Investments $ 1,957 $ 29 $ 4,089 $ 1,687 $ 31 $ 3,528 Other Investments Cash and cash equivalents $ — $ — $ 16 $ — $ — $ 1 Total Other Investments $ — $ — $ 16 $ — $ — $ 1 Total Investments $ 1,957 $ 29 $ 4,105 $ 1,687 $ 31 $ 3,529
Schedule of Realized Gain (Loss)	Realized gains and losses, which were determined on a specific identification basis, from sales of FV-NI and AFS securities for the years ended December 31, 2021, 2020 and 2019, were as follows. Years Ended December 31, (in millions) 2021 2020 2019 FV-NI: Realized gains $ 283 $ 52 $ 38 Realized losses 44 59 33 AFS: Realized gains 15 24 7 Realized losses 13 13 5
Duke Energy Florida
Investment [Line Items]
Summary of Investments in Debt and Equity Securities	The following table presents the estimated fair value of investments in debt and equity securities; equity investments are classified as FV-NI and debt investments are classified as AFS. December 31, 2021 December 31, 2020 Gross Gross Gross Gross Unrealized Unrealized Unrealized Unrealized Holding Holding Estimated Holding Holding Estimated (in millions) Gains Losses Fair Value Gains Losses Fair Value NDTF Cash and cash equivalents $ — $ — $ 13 $ — $ — $ 71 Equity securities 103 1 115 79 — 91 Corporate debt securities — — 41 — — — U.S. government bonds — 6 384 — — 474 Total NDTF Investments (a) $ 103 $ 7 $ 553 $ 79 $ — $ 636 Other Investments Cash and cash equivalents $ — $ — $ 3 $ — $ — $ 1 Municipal bonds 2 — 26 3 — 26 Total Other Investments $ 2 $ — $ 29 $ 3 $ — $ 27 Total Investments $ 105 $ 7 $ 582 $ 82 $ — $ 663 (a) During the years ended December 31, 2021, and 2020, Duke Energy Florida continued to receive reimbursements from the NDTF for costs related to ongoing decommissioning activity of the Crystal River Unit 3.
Schedule of Realized Gain (Loss)	Realized gains and losses, which were determined on a specific identification basis, from sales of FV-NI and AFS securities for the years ended December 31, 2021, 2020 and 2019, were as follows. Years Ended December 31, (in millions) 2021 2020 2019 FV-NI: Realized gains $ 1 $ 250 $ 21 Realized losses 1 16 11 AFS: Realized gains 1 — 29 Realized losses 1 — 24
Duke Energy Indiana
Investment [Line Items]
Summary of Investments in Debt and Equity Securities	The following table presents the estimated fair value of investments in debt and equity securities; equity investments are measured at FV-NI and debt investments are classified as AFS. December 31, 2021 December 31, 2020 Gross Gross Gross Gross Unrealized Unrealized Unrealized Unrealized Holding Holding Estimated Holding Holding Estimated (in millions) Gains Losses Fair Value Gains Losses Fair Value Investments Cash and cash equivalents $ — $ — $ — $ — $ — $ 1 Equity securities 6 — 97 58 — 97 Corporate debt securities — — 6 — — 3 Municipal bonds 1 1 46 1 — 38 U.S. government bonds — — 12 — — 4 Total Investments $ 7 $ 1 $ 161 $ 59 $ — $ 143

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	12 Months Ended
	Dec. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Measurement Amounts For Assets And Liabilities	The following tables provide recorded balances for assets and liabilities measured at fair value on a recurring basis on the Consolidated Balance Sheets. Derivative amounts in the tables below for all Duke Energy Registrants exclude cash collateral, which is disclosed in Note 14. See Note 15 for additional information related to investments by major security type for the Duke Energy Registrants. December 31, 2021 (in millions) Total Fair Value Level 1 Level 2 Level 3 Not Categorized NDTF cash and cash equivalents $ 160 $ 160 $ — $ — $ — NDTF equity securities 7,350 7,300 — — 50 NDTF debt securities 2,891 967 1,924 — — Other equity securities 156 156 — — — Other debt securities 300 45 255 — — Other cash and cash equivalents 36 36 — — — Derivative assets 320 3 293 24 — Total assets 11,213 8,667 2,472 24 50 Derivative liabilities (472) (13) (314) (145) — Net assets (liabilities) $ 10,741 $ 8,654 $ 2,158 $ (121) $ 50 December 31, 2020 (in millions) Total Fair Value Level 1 Level 2 Level 3 Not Categorized NDTF cash and cash equivalents $ 177 $ 177 $ — $ — $ — NDTF equity securities 6,235 6,189 — — 46 NDTF debt securities 2,717 874 1,843 — — Other equity securities 146 146 — — — Other debt securities 285 37 248 — — Other cash and cash equivalents 127 127 — — — Derivative assets 61 1 53 7 — Total assets 9,748 7,551 2,144 7 46 Derivative liabilities (324) — (240) (84) — Net assets (liabilities) $ 9,424 $ 7,551 $ 1,904 $ (77) $ 46
Reconciliation Of Assets And Liabilities Measured At Fair Value On A Recurring Basis Using Unobservable Inputs	The following table provides reconciliations of beginning and ending balances of assets and liabilities measured at fair value using Level 3 measurements. Derivatives (net) Years Ended December 31, (in millions) 2021 2020 Balance at beginning of period $ (77) $ (102) Total pretax realized or unrealized losses included in comprehensive income (75) (84) Purchases, sales, issuances and settlements: Purchases 21 14 Settlements (5) (19) Net transfers Out of Level 3 (a) — 117 Total gains (losses) included on the Consolidated Balance Sheet 15 (3) Balance at end of period $ (121) $ (77) (a) Transferred from Level 3 to Level 2 because observable market data became available.
Quantitative Information Table - Level 3	The following tables include quantitative information about the Duke Energy Registrants' derivatives classified as Level 3. December 31, 2021 Weighted Fair Value Average Investment Type (in millions) Valuation Technique Unobservable Input Range Range Duke Energy Electricity contracts $ (145) RTO forward pricing Forward electricity curves – price per MWh $ 19.04 – $ 139.11 $ 37.57 Duke Energy Ohio FTRs 2 RTO auction pricing FTR price – per MWh 0.06 – 1.79 0.96 Duke Energy Indiana FTRs 22 RTO auction pricing FTR price – per MWh (1.18) – 13.11 2.68 Duke Energy Total Level 3 derivatives $ (121) December 31, 2020 Weighted Fair Value Average Investment Type (in millions) Valuation Technique Unobservable Input Range Range Duke Energy Electricity contracts $ (84) Discounted cash flow Forward electricity curves – price per MWh $ 14.68 – $ 151.84 $ 28.84 Duke Energy Ohio FTRs 1 RTO auction pricing FTR price – per MWh 0.25 – 1.68 0.79 Duke Energy Indiana FTRs 6 RTO auction pricing FTR price – per MWh (2.40) – 7.41 1.05 Duke Energy Total Level 3 derivatives $ (77)
Schedule of Long-Term Debt Fair Value	The fair value and book value of long-term debt, including current maturities, is summarized in the following table. Estimates determined are not necessarily indicative of amounts that could have been settled in current markets. Fair value of long-term debt uses Level 2 measurements. December 31, 2021 December 31, 2020 (in millions) Book Value Fair Value Book Value Fair Value Duke Energy (a) $ 63,835 $ 69,683 $ 59,863 $ 69,292 Duke Energy Carolinas 13,275 15,101 12,218 14,917 Progress Energy 20,823 23,751 19,264 23,470 Duke Energy Progress 10,249 11,252 9,258 10,862 Duke Energy Florida 8,482 9,772 7,915 9,756 Duke Energy Ohio 3,193 3,570 3,089 3,650 Duke Energy Indiana 4,323 5,067 4,091 5,204 Piedmont 2,968 3,278 2,780 3,306 (a) Book value of long-term de bt includes $1.25 billion as of December 31, 2021, and $1.3 billion as of December 31, 2020, of unamortized debt discount and premium, net in purchase accounting adjustments related to the mergers with Progress Energy and Piedmont that are excluded from fair value of long-term debt.
Duke Energy Carolinas
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Measurement Amounts For Assets And Liabilities	The following tables provide recorded balances for assets and liabilities measured at fair value on a recurring basis on the Consolidated Balance Sheets. December 31, 2021 (in millions) Total Fair Value Level 1 Level 2 Not Categorized NDTF cash and cash equivalents $ 53 $ 53 $ — $ — NDTF equity securities 4,265 4,215 — 50 NDTF debt securities 1,441 339 1,102 — Derivative assets 162 — 162 — Total assets 5,921 4,607 1,264 50 Derivative liabilities (35) — (35) — Net assets $ 5,886 $ 4,607 $ 1,229 $ 50 December 31, 2020 (in millions) Total Fair Value Level 1 Level 2 Not Categorized NDTF cash and cash equivalents $ 30 $ 30 $ — $ — NDTF equity securities 3,685 3,639 — 46 NDTF debt securities 1,250 192 1,058 — Derivative assets 20 — 20 — Total assets 4,985 3,861 1,078 46 Derivative liabilities (20) — (20) — Net assets $ 4,965 $ 3,861 $ 1,058 $ 46
Progress Energy
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Measurement Amounts For Assets And Liabilities	The following table provides recorded balances for assets and liabilities measured at fair value on a recurring basis on the Consolidated Balance Sheets. December 31, 2021 December 31, 2020 (in millions) Total Fair Value Level 1 Level 2 Total Fair Value Level 1 Level 2 NDTF cash and cash equivalents $ 107 $ 107 $ — $ 147 $ 147 $ — NDTF equity securities 3,085 3,085 — 2,550 2,550 — NDTF debt securities 1,450 628 822 1,467 682 785 Other debt securities 26 — 26 26 — 26 Other cash and cash equivalents 20 20 — 106 106 Derivative assets 124 — 124 33 — 33 Total assets 4,812 3,840 972 4,329 3,485 844 Derivative liabilities (24) — (24) (29) — (29) Net assets $ 4,788 $ 3,840 $ 948 $ 4,300 $ 3,485 $ 815
Duke Energy Progress
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Measurement Amounts For Assets And Liabilities	The following table provides recorded balances for assets and liabilities measured at fair value on a recurring basis on the Consolidated Balance Sheets. December 31, 2021 December 31, 2020 (in millions) Total Fair Value Level 1 Level 2 Total Fair Value Level 1 Level 2 NDTF cash and cash equivalents $ 94 $ 94 $ — $ 76 $ 76 $ — NDTF equity securities 2,970 2,970 — 2,459 2,459 — NDTF debt securities 1,025 289 736 993 237 756 Other cash and cash equivalents 16 16 — 1 1 — Derivative assets 124 — 124 33 — 33 Total assets 4,229 3,369 860 3,562 2,773 789 Derivative liabilities (10) — (10) (14) — (14) Net assets $ 4,219 $ 3,369 $ 850 $ 3,548 $ 2,773 $ 775
Duke Energy Florida
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Measurement Amounts For Assets And Liabilities	The following table provides recorded balances for assets and liabilities measured at fair value on a recurring basis on the Consolidated Balance Sheets. December 31, 2021 December 31, 2020 (in millions) Total Fair Value Level 1 Level 2 Total Fair Value Level 1 Level 2 NDTF cash and cash equivalents $ 13 $ 13 $ — $ 71 $ 71 $ — NDTF equity securities 115 115 — 91 91 — NDTF debt securities 425 339 86 474 445 29 Other debt securities 26 — 26 26 — 26 Other cash and cash equivalents 3 3 — 1 1 — Total assets 582 470 112 663 608 55 Derivative liabilities (14) — (14) — — — Net assets $ 568 $ 470 $ 98 $ 663 $ 608 $ 55
Duke Energy Indiana
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Measurement Amounts For Assets And Liabilities	The following table provides recorded balances for assets and liabilities measured at fair value on a recurring basis on the Consolidated Balance Sheets. December 31, 2021 December 31, 2020 (in millions) Total Fair Value Level 1 Level 2 Level 3 Total Fair Value Level 1 Level 2 Level 3 Other equity securities $ 97 $ 97 $ — $ — $ 97 $ 97 $ — $ — Other debt securities 64 — 64 — 45 — 45 — Other cash equivalents — — — — 1 1 — — Derivative assets 23 1 — 22 6 — — 6 Total assets 184 98 64 22 149 98 45 6 Derivative liabilities (27) (13) (14) — (1) (1) — — Net assets $ 157 $ 85 $ 50 $ 22 $ 148 $ 97 $ 45 $ 6
Reconciliation Of Assets And Liabilities Measured At Fair Value On A Recurring Basis Using Unobservable Inputs	The following table provides a reconciliation of beginning and ending balances of assets and liabilities measured at fair value using Level 3 measurements. Derivatives (net) Years Ended December 31, (in millions) 2021 2020 Balance at beginning of period $ 6 $ 11 Purchases, sales, issuances and settlements: Purchases 18 10 Settlements (16) (13) Total gains (losses) included on the Consolidated Balance Sheet 14 (2) Balance at end of period $ 22 $ 6
Piedmont
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Measurement Amounts For Assets And Liabilities	The following table provides recorded balances for assets and liabilities measured at fair value on a recurring basis on the Consolidated Balance Sheets. December 31, 2021 December 31, 2020 (in millions) Total Fair Value Level 1 Level 2 Total Fair Value Level 1 Level 2 Derivative assets $ 3 $ 3 $ — $ 1 $ 1 $ — Derivative liabilities (139) — (139) (122) — (122) Net (liabilities) assets $ (136) $ 3 $ (139) $ (121) $ 1 $ (122)
Reconciliation Of Assets And Liabilities Measured At Fair Value On A Recurring Basis Using Unobservable Inputs	The following table provides a reconciliation of beginning and ending balances of assets and liabilities measured at fair value using Level 3 measurements. Derivatives (net) Year Ended December 31, (in millions) 2020 Balance at beginning of period $ (117) Net transfers Out of Level 3 (a) 117 Balance at end of period $ — (a) Transferred from Level 3 to Level 2 because observable market data became available.

Variable Interest Entities (Tab

Variable Interest Entities (Tables)	12 Months Ended
	Dec. 31, 2021
Consolidated VIEs
Variable Interest Entity [Line Items]
Schedule Of Variable Interest Entities	The following table summarizes the amounts and expiration dates of the credit facilities and associated restricted receivables described above. Duke Energy Duke Energy Duke Energy Duke Energy Carolinas Progress Florida (in millions) CRC DERF DEPR DEFR Expiration date February 2023 January 2025 April 2023 April 2023 Credit facility amount $ 350 $ 475 $ 350 $ 250 Amounts borrowed at December 31, 2021 350 475 350 250 Amounts borrowed at December 31, 2020 350 364 250 250 Restricted Receivables at December 31, 2021 587 844 574 427 Restricted Receivables at December 31, 2020 547 696 500 397
Consolidated VIEs | DEFPF
Variable Interest Entity [Line Items]
Schedule Of Variable Interest Entities	The following table summarizes the impact of DEFPF on Duke Energy Florida's Consolidated Balance Sheets. December 31, (in millions) 2021 2020 Receivables of VIEs $ 5 $ 4 Regulatory Assets: Current 54 53 Current Assets: Other 39 39 Other Noncurrent Assets: Regulatory assets 883 937 Current Liabilities: Other 9 10 Current maturities of long-term debt 56 55 Long-Term Debt 946 1,002
Consolidated VIEs | DECNCSF and DEPNCSF
Variable Interest Entity [Line Items]
Schedule Of Variable Interest Entities	The following table summarizes the impact of these VIEs on Duke Energy Carolinas’ and Duke Energy Progress’ Consolidated Balance Sheets. December 31, 2021 Duke Energy Duke Energy (in millions) Carolinas Progress Regulatory Assets: Current $ 12 $ 39 Other Noncurrent Assets: Regulatory assets 220 720 Other Noncurrent Assets: Other 1 4 Interest Accrued 1 2 Current maturities of long-term debt 5 15 Long-Term Debt 228 747
Consolidated VIEs | Commercial Renewables
Variable Interest Entity [Line Items]
Schedule Of Variable Interest Entities	The table below presents material balances reported on Duke Energy's Consolidated Balance Sheets related to Commercial Renewables VIEs. December 31, (in millions) 2021 2020 Current Assets: Other $ 215 $ 257 Property, Plant and Equipment: Cost 7,339 6,394 Accumulated depreciation and amortization (1,474) (1,242) Other Noncurrent Assets: Other 62 67 Current maturities of long-term debt 167 167 Long-Term Debt 1,475 1,569 Other Noncurrent Liabilities: AROs 173 148 Other Noncurrent Liabilities: Other 319 316
Non-consolidated VIEs
Variable Interest Entity [Line Items]
Schedule Of Variable Interest Entities	The following tables summarize the impact of non-consolidated VIEs on the Consolidated Balance Sheets. December 31, 2021 Duke Energy Duke Duke Pipeline Commercial Energy Energy (in millions) Investments Renewables Total Ohio Indiana Receivables from affiliated companies $ — $ — $ — $ 79 $ 97 Investments in equity method unconsolidated affiliates 15 508 523 — — Other noncurrent assets 61 — 61 — — Total assets $ 76 $ 508 $ 584 $ 79 $ 97 Other current liabilities 47 4 51 — — Other noncurrent liabilities 54 3 57 — — Total liabilities $ 101 $ 7 $ 108 $ — $ — Net (liabilities) assets $ (25) $ 501 $ 476 $ 79 $ 97 December 31, 2020 Duke Energy Duke Duke Pipeline Commercial Energy Energy (in millions) Investments Renewables Total Ohio Indiana Receivables from affiliated companies $ — $ — $ — $ 83 $ 110 Investments in equity method unconsolidated affiliates — 530 530 — — Other noncurrent assets 31 — 31 — — Total assets $ 31 $ 530 $ 561 $ 83 $ 110 Other current liabilities 928 5 933 — — Other noncurrent liabilities 8 10 18 — — Total liabilities $ 936 $ 15 $ 951 $ — $ — Net (liabilities) assets $ (905) $ 515 $ (390) $ 83 $ 110
Non-consolidated VIEs | CRC
Variable Interest Entity [Line Items]
Schedule Of Variable Interest Entities	Key assumptions used in estimating fair value are detailed in the following table. Duke Energy Ohio Duke Energy Indiana 2021 2020 2021 2020 Anticipated credit loss ratio 0.5 % 0.5 % 0.3 % 0.3 % Discount rate 1.1 % 1.6 % 1.1 % 1.6 % Receivable turnover rate 13.5 % 13.4 % 11.3 % 11.3 % The following table shows the gross and net receivables sold. Duke Energy Ohio Duke Energy Indiana December 31, December 31, (in millions) 2021 2020 2021 2020 Receivables sold $ 269 $ 270 $ 328 $ 344 Less: Retained interests 79 83 97 110 Net receivables sold $ 190 $ 187 $ 231 $ 234 The following table shows sales and cash flows related to receivables sold. Duke Energy Ohio Duke Energy Indiana Years Ended December 31, Years Ended December 31, (in millions) 2021 2020 2019 2021 2020 2019 Sales Receivables sold $ 2,023 $ 1,905 $ 1,979 $ 2,909 $ 2,631 $ 2,837 Loss recognized on sale 10 10 14 13 12 17 Cash flows Cash proceeds from receivables sold 2,018 1,875 1,993 2,909 2,586 2,860 Collection fees received 1 1 1 1 1 1 Return received on retained interests 4 4 6 6 5 9

Revenue (Tables)

Revenue (Tables)	12 Months Ended
	Dec. 31, 2021
Revenue from Contract with Customer [Abstract]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction	Supplemental requirements contracts that include contracted blocks of energy and capacity at contractually fixed prices have the following estimated remaining performance obligations: Remaining Performance Obligations (in millions) 2022 2023 2024 2025 2026 Thereafter Total Progress Energy $ 109 $ 53 $ 45 $ 7 $ 7 $ 43 $ 264 Duke Energy Progress 8 8 8 — — — 24 Duke Energy Florida 101 45 37 7 7 43 240 Duke Energy Indiana 1 9 14 14 14 12 64 Remaining Performance Obligations (in millions) 2022 2023 2024 2025 2026 Thereafter Total Piedmont $ 71 $ 64 $ 61 $ 60 $ 50 $ 286 $ 592
Disaggregation of Revenue	Disaggregated revenues are presented as follows: Year Ended December 31, 2021 Duke Duke Duke Duke Duke (in millions) Duke Energy Progress Energy Energy Energy Energy By market or type of customer Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Electric Utilities and Infrastructure Residential $ 10,097 $ 3,054 $ 5,084 $ 2,156 $ 2,928 $ 767 $ 1,188 $ — General 6,375 2,210 2,883 1,378 1,505 440 825 — Industrial 2,924 1,145 894 634 260 135 750 — Wholesale 2,199 472 1,385 1,164 221 56 285 — Other revenues 879 264 716 387 329 83 86 — Total Electric Utilities and Infrastructure revenue from contracts with customers $ 22,474 $ 7,145 $ 10,962 $ 5,719 $ 5,243 $ 1,481 $ 3,134 $ — Gas Utilities and Infrastructure Residential $ 1,131 $ — $ — $ — $ — $ 354 $ — $ 777 Commercial 561 — — — — 143 — 418 Industrial 158 — — — — 20 — 137 Power Generation — — — — — — — 92 Other revenues 133 — — — — 28 — 45 Total Gas Utilities and Infrastructure revenue from contracts with customers $ 1,983 $ — $ — $ — $ — $ 545 $ — $ 1,469 Commercial Renewables Revenue from contracts with customers $ 217 $ — $ — $ — $ — $ — $ — $ — Other Revenue from contracts with customers $ 29 $ — $ — $ — $ — $ — $ — $ — Total revenue from contracts with customers $ 24,703 $ 7,145 $ 10,962 $ 5,719 $ 5,243 $ 2,026 $ 3,134 $ 1,469 Other revenue sources (a) $ 394 $ (43) $ 95 $ 61 $ 16 $ 11 $ 40 $ 100 Total revenues $ 25,097 $ 7,102 $ 11,057 $ 5,780 $ 5,259 $ 2,037 $ 3,174 $ 1,569 (a) Other revenue sources include revenues from leases, derivatives and alternative revenue programs that are not considered revenues from contracts with customers. Alternative revenue programs in certain jurisdictions include regulatory mechanisms that periodically adjust for over or under collection of related revenues. Year Ended December 31, 2020 Duke Duke Duke Duke Duke (in millions) Duke Energy Progress Energy Energy Energy Energy By market or type of customer Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Electric Utilities and Infrastructure Residential $ 9,806 $ 2,997 $ 5,017 $ 2,059 $ 2,958 $ 726 $ 1,064 $ — General 6,194 2,233 2,779 1,312 1,467 442 740 — Industrial 2,859 1,137 901 649 252 137 683 — Wholesale 1,864 380 1,228 1,034 194 32 224 — Other revenues 914 281 596 294 302 82 72 — Total Electric Utilities and Infrastructure revenue from contracts with customers $ 21,637 $ 7,028 $ 10,521 $ 5,348 $ 5,173 $ 1,419 $ 2,783 $ — Gas Utilities and Infrastructure Residential $ 930 $ — $ — $ — $ — $ 300 $ — $ 630 Commercial 446 — — — — 117 — 329 Industrial 127 — — — — 17 — 110 Power Generation — — — — — — — 34 Other revenues 87 — — — — 17 — 70 Total Gas Utilities and Infrastructure revenue from contracts with customers $ 1,590 $ — $ — $ — $ — $ 451 $ — $ 1,173 Commercial Renewables Revenue from contracts with customers $ 227 $ — $ — $ — $ — $ — $ — $ — Other Revenue from contracts with customers $ 26 $ — $ — $ — $ — $ — $ — $ — Total revenue from contracts with customers $ 23,480 $ 7,028 $ 10,521 $ 5,348 $ 5,173 $ 1,870 $ 2,783 $ 1,173 Other revenue sources (a) $ 388 $ (13) $ 106 $ 74 $ 15 $ (12) $ 12 $ 124 Total revenues $ 23,868 $ 7,015 $ 10,627 $ 5,422 $ 5,188 $ 1,858 $ 2,795 $ 1,297 (a) Other revenue sources include revenues from leases, derivatives and alternative revenue programs that are not considered revenues from contracts with customers. Alternative revenue programs in certain jurisdictions include regulatory mechanisms that periodically adjust for over or under collection of related revenues. Year Ended December 31, 2019 Duke Duke Duke Duke Duke (in millions) Duke Energy Progress Energy Energy Energy Energy By market or type of customer Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Electric Utilities and Infrastructure Residential $ 9,863 $ 3,044 $ 4,998 $ 2,144 $ 2,854 $ 733 $ 1,087 $ — General 6,431 2,244 2,935 1,368 1,567 451 802 — Industrial 3,071 1,215 934 675 259 147 774 — Wholesale 2,212 462 1,468 1,281 187 46 235 — Other revenues 770 276 548 317 231 80 89 — Total Electric Utilities and Infrastructure revenue from contracts with customers $ 22,347 $ 7,241 $ 10,883 $ 5,785 $ 5,098 $ 1,457 $ 2,987 $ — Gas Utilities and Infrastructure Residential $ 976 $ — $ — $ — $ — $ 315 $ — $ 661 Commercial 508 — — — — 130 — 378 Industrial 141 — — — — 19 — 122 Power Generation — — — — — — — 51 Other revenues 129 — — — — 19 — 110 Total Gas Utilities and Infrastructure revenue from contracts with customers $ 1,754 $ — $ — $ — $ — $ 483 $ — $ 1,322 Commercial Renewables Revenue from contracts with customers $ 223 $ — $ — $ — $ — $ — $ — $ — Other Revenue from contracts with customers $ 24 $ — $ — $ — $ — $ — $ — $ — Total revenue from contracts with customers $ 24,348 $ 7,241 $ 10,883 $ 5,785 $ 5,098 $ 1,940 $ 2,987 $ 1,322 Other revenue sources (a) $ 731 $ 154 $ 319 $ 172 $ 133 $ — $ 17 $ 59 Total revenues $ 25,079 $ 7,395 $ 11,202 $ 5,957 $ 5,231 $ 1,940 $ 3,004 $ 1,381 (a) Other revenue sources include revenues from leases, derivatives and alternative revenue programs that are not considered revenues from contracts with customers. Alternative revenue programs in certain jurisdictions include regulatory mechanisms that periodically adjust for over or under collection of related revenues.
Accounts Receivable, Allowance for Credit Loss	The following table presents the reserve for credit losses for trade and other receivables based on adoption of the new standard. Years Ended December 31, 2020 and 2021 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Balance at December 31, 2019 $ 76 $ 10 $ 16 $ 8 $ 7 $ 4 $ 3 $ 6 Cumulative Change in Accounting Principle 5 1 2 1 1 — — 1 Write-Offs (58) (13) (23) (8) (14) — — (6) Credit Loss Expense 75 13 29 9 20 — — 11 Other Adjustments 48 12 13 13 — — — — Balance at December 31, 2020 $ 146 $ 23 $ 37 $ 23 $ 14 $ 4 $ 3 $ 12 Write-Offs (58) (21) (25) (12) (13) — — (9) Credit Loss Expense 54 27 25 11 14 — — 7 Other Adjustments (20) 13 (1) (1) 1 — — 5 Balance at December 31, 2021 $ 122 $ 42 $ 36 $ 21 $ 16 $ 4 $ 3 $ 15
Financing Receivable, Past Due	The aging of trade receivables is presented in the table below. Duke Energy considers receivables greater than 30 days outstanding past due. December 31, 2021 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Unbilled Receivables (a)(b) $ 964 $ 316 $ 266 $ 193 $ 73 $ 4 $ 27 $ 106 0-30 days 2,104 595 800 405 393 42 51 202 30-60 days 212 77 72 44 28 4 13 12 60-90 days 88 37 41 21 20 1 1 2 90+ days 249 106 65 37 28 47 11 7 Deferred Payment Arrangements (c) 115 55 45 22 23 2 — 4 Trade and Other Receivables $ 3,732 $ 1,186 $ 1,289 $ 722 $ 565 $ 100 $ 103 $ 333 December 31, 2020 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Unbilled Receivables (a)(b) $ 969 $ 328 $ 283 $ 167 $ 116 $ 2 $ 16 $ 86 0-30 days 1,789 445 707 398 307 60 26 149 30-60 days 185 80 54 25 29 8 3 8 60-90 days 22 1 10 4 6 2 1 3 90+ days 119 16 32 9 23 30 12 9 Deferred Payment Arrangements (c) 215 96 80 52 28 — — 7 Trade and Other Receivables $ 3,299 $ 966 $ 1,166 $ 655 $ 509 $ 102 $ 58 $ 262 (a) Unbilled revenues are recognized by applying customer billing rates to the estimated volumes of energy or natural gas delivered but not yet billed and are included within Receivables and Receivables of VIEs on the Consolidated Balance Sheets. (b) Duke Energy Ohio and Duke Energy Indiana sell, on a revolving basis, nearly all of their retail accounts receivable, including receivables for unbilled revenues, to an affiliate, CRC, and account for the transfers of receivables as sales. Accordingly, the receivables sold are not reflected on the Consolidated Balance Sheets of Duke Energy Ohio and Duke Energy Indiana. See Note 17 for further information. These receivables for unbilled revenues are $82 million and $121 million for Duke Energy Ohio and Duke Energy Indiana, respectively, as of December 31, 2021, and $87 million and $134 million for Duke Energy Ohio and Duke Energy Indiana, respectively, as of December 31, 2020. (c) Due to certain customer financial hardships created by the COVID-19 pandemic and resulting stay-at-home orders, Duke Energy permitted customers to defer payment of past-due amounts through an installment payment plan over a period of several months.

Stockholders' Equity (Tables)

Stockholders' Equity (Tables)	12 Months Ended
	Dec. 31, 2021
Equity [Abstract]
Schedule Of Earnings Per Share	The following table presents Duke Energy’s basic and diluted EPS calculations, the weighted average number of common shares outstanding and common and preferred share dividends declared. Years Ended December 31, (in millions, except per share amounts) 2021 2020 2019 Net Income available to Duke Energy common stockholders $ 3,802 $ 1,270 $ 3,707 Less: Income (Loss) from discontinued operations 7 7 (7) Accumulated preferred stock dividends adjustment — 1 (15) Less: Impact of participating securities 4 2 5 Income from continuing operations available to Duke Energy common stockholders $ 3,791 $ 1,262 $ 3,694 Weighted average common shares outstanding – basic 769 737 729 Equity forwards — 1 — Weighted average common shares outstanding – diluted 769 738 729 EPS from continuing operations available to Duke Energy common stockholders Basic and Diluted $ 4.93 $ 1.71 $ 5.07 Potentially dilutive items excluded from the calculation (a) 2 2 2 Dividends declared per common share $ 3.90 $ 3.82 $ 3.75 Dividends declared on Series A preferred stock per depositary share $ 1.437 $ 1.437 $ 1.03 Dividends declared on Series B preferred stock per share $ 48.750 $ 49.292 $ — (a) Performance stock awards were not included in the dilutive securities calculation because the performance measures related to the awards had not been met.

Severance (Tables)

Severance (Tables)	12 Months Ended
	Dec. 31, 2021
Restructuring and Related Activities [Abstract]
Schedule of Severance Expense	The following table presents the direct and allocated severance and related charges accrued for approximately 290 employees in 2021, 30 e mployees in 2020 and 140 employees in 2019, by the Duke Energy Registrants within Operation, maintenance and other on the Consolidated Statements of Operations. Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Year Ended December 31, 2021 (a)(b) $ 69 $ 33 $ 26 $ 20 $ 6 $ 2 $ 3 $ 2 Year Ended December 31, 2020 (c)(d) (85) (58) (28) (31) 3 — — — Year Ended December 31, 2019 16 8 6 3 3 — 1 1 (a) Includes amortization of deferred severance charges of approximately $33 million, $22 million, $11 million and $11 million for Duke Energy, Duke Energy Carolinas, Progress Energy and Duke Energy Progress, respectively. (b) Includes adjustments associated with 2018 severance charges of approximately $(3) million, $(2) million and $(1) million for Duke Energy, Duke Energy Carolinas and Duke Energy Indiana, respectively. (c) Includes unamortized deferred severance charges of approximately $(86) million, $(57) million, $(29) million and $(29) million for Duke Energy, Duke Energy Carolinas, Progress Energy and Duke Energy Progress, respectively. (d) Includes adjustments associated with 2018 severance charges of approximately $(6) million, $(2) million, $(3) million and $(2) million for Duke Energy, Duke Energy Carolinas, Progress Energy and Duke Energy Progress, respectively.
Schedule of Severance Liability	The table below presents the severance liability for past and ongoing severance plans including the plans described above. Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Balance at December 31, 2020 $ 11 $ 2 $ 3 $ 1 $ 2 $ — $ 1 $ — Provision/Adjustments 36 1 1 1 — — — — Cash Reductions (8) (1) (2) (1) (1) — (1) — Balance at December 31, 2021 $ 39 $ 2 $ 2 $ 1 $ 1 $ — $ — $ —

Stock-Based Compensation (Table

Stock-Based Compensation (Tables)	12 Months Ended
	Dec. 31, 2021
Share-based Payment Arrangement [Abstract]
Schedule Of Total Stock-Based Compensation Expense, net of tax	The following table summarizes the total expense recognized by the Duke Energy Registrants, net of tax, for stock-based compensation. Years Ended December 31, (in millions) 2021 2020 2019 Duke Energy $ 64 $ 61 $ 65 Duke Energy Carolinas 23 22 24 Progress Energy 24 23 24 Duke Energy Progress 15 15 15 Duke Energy Florida 9 9 9 Duke Energy Ohio 5 4 5 Duke Energy Indiana 6 6 6 Piedmont 3 3 3
Schedule Of Stock-Based Compensation Expense	Duke Energy's pretax stock-based compensation costs, the tax benefit associated with stock-based compensation expense and stock-based compensation costs capitalized are included in the following table. Years Ended December 31, (in millions) 2021 2020 2019 RSU awards $ 49 $ 46 $ 44 Performance awards 39 38 45 Pretax stock-based compensation cost $ 88 $ 84 $ 89 Stock-based compensation costs capitalized 5 5 5 Stock-based compensation expense $ 83 $ 79 $ 84 Tax benefit associated with stock-based compensation expense $ 19 $ 18 $ 19
Schedule of Share-based Compensation, Restricted Stock Units Award Activity	The following table includes information related to RSU awards. Years Ended December 31, 2021 2020 2019 Shares granted (in thousands) 673 498 571 Fair value (in millions) $ 59 $ 50 $ 51 The following table summarizes information about RSU awards outstanding. Weighted Average Shares Grant Date Fair Value (in thousands) (per share) Outstanding at December 31, 2020 939 $ 93 Granted 673 88 Vested (502) 89 Forfeited (67) 92 Outstanding at December 31, 2021 1,043 92 RSU awards expected to vest 996 92
Schedule of Performance Awards	The following table includes information related to stock-based performance awards. Years Ended December 31, 2021 2020 2019 Shares granted assuming target performance (in thousands) 380 319 320 Fair value (in millions) $ 33 $ 34 $ 27
Schedule of Nonvested Performance-based Units Activity	The following table summarizes information about stock-based performance awards outstanding and assumes payout at the target level. Weighted Average Shares Grant Date Fair Value (in thousands) (per share) Outstanding at December 31, 2020 962 $ 87 Granted 380 88 Vested (346) 73 Forfeited (44) 92 Outstanding at December 31, 2021 952 93 Stock-based performance awards expected to vest 927 93

Employee Benefit Plans (Tables)

Employee Benefit Plans (Tables)	12 Months Ended
	Dec. 31, 2021
Defined Benefit Plan Disclosure [Line Items]
Pension Plan Contributions	The following table includes information related to the Duke Energy Registrants’ contributions to its qualified defined benefit pension plans. Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Contributions Made: 2021 $ — $ — $ — $ — $ — $ — $ — $ — 2020 — — — — — — — — 2019 77 7 57 4 53 2 2 1
Fair Value and Allocation of Plan Assets	The following table includes the target asset allocations by asset class at December 31, 2021, and the actual asset allocations for the Duke Energy Master Retirement Trust. Actual Allocation at Target December 31, Allocation 2021 2020 Global equity securities 27 % 24 % 30 % Global private equity securities 1 % 1 % 1 % Debt securities 62 % 62 % 55 % Return seeking debt securities 4 % 4 % 5 % Hedge funds 2 % 3 % 3 % Real estate and cash 4 % 6 % 6 % Total 100 % 100 % 100 % The following table presents target and actual asset allocations for the VEBA trusts at December 31, 2021. Actual Allocation at Target December 31, Allocation 2021 2020 U.S. equity securities 30 % 19 % 36 % Non-U.S. equity securities 5 % 5 % 6 % Real estate 2 % 3 % 2 % Debt securities 45 % 18 % 42 % Cash 18 % 55 % 14 % Total 100 % 100 % 100 % The following tables provide the fair value measurement amounts for the Duke Energy Master Retirement Trust qualified pension and other post-retirement assets. December 31, 2021 Total Fair Not (in millions) Value Level 1 Level 2 Level 3 Categorized (b) Equity securities $ 2,575 $ 2,547 $ — $ — $ 28 Corporate debt securities 4,189 — 4,189 — — Short-term investment funds 382 272 110 — — Partnership interests 95 — — 95 — Hedge funds 216 — — — 216 U.S. government securities 1,618 — 1,618 — — Governments bonds – foreign 78 — 78 — — Cash 144 144 — — — Government and commercial mortgage backed securities 2 — 2 — — Net pending transactions and other investments 53 12 41 — — Total assets (a) $ 9,352 $ 2,975 $ 6,038 $ 95 $ 244 (a) Duke Energy Carolinas, Progress Energy, Duke Energy Progress, Duke Energy Florida, Duke Energy Ohio, Duke Energy Indiana and Piedmont were allocated approximately 26%, 32%, 15%, 17%, 5%, 7% and 4%, respectively, of the Duke Energy Master Retirement Trust at December 31, 2021. Accordingly, all amounts included in the table above are allocable to the Subsidiary Registrants using these percentages. (b) Certain investments that are measured at fair value using the net asset value per share practical expedient have not been categorized in the fair value hierarchy. December 31, 2020 Total Fair Not (in millions) Value Level 1 Level 2 Level 3 Categorized (b) Equity securities $ 3,202 $ 3,162 $ — $ — $ 40 Corporate debt securities 4,162 — 4,162 — — Short-term investment funds 397 247 150 — — Partnership interests 97 — — — 97 Hedge funds 198 — — — 198 U.S. government securities 1,164 — 1,164 — — Governments bonds – foreign 73 — 73 — — Cash 98 98 — — — Net pending transactions and other investments 88 34 54 — — Total assets (a) $ 9,479 $ 3,541 $ 5,603 $ — $ 335 (a) Duke Energy Carolinas, Progress Energy, Duke Energy Progress, Duke Energy Florida, Duke Energy Ohio, Duke Energy Indiana and Piedmont were allocated approximately 26%, 32%, 15%, 17%, 5%, 7% and 4%, respectively, of the Duke Energy Master Retirement Trust at December 31, 2020. Accordingly, all amounts included in the table above are allocable to the Subsidiary Registrants using these percentages. (b) Certain investments that are measured at fair value using the net asset value per share practical expedient have not been categorized in the fair value hierarchy. The following tables provide the fair value measurement amounts for VEBA trust assets. December 31, 2021 Total Fair (in millions) Value Level 2 Cash and cash equivalents $ 14 $ 14 Real estate 2 2 Equity securities 18 18 Debt securities 11 11 Total assets $ 45 $ 45 December 31, 2020 Total Fair (in millions) Value Level 2 Cash and cash equivalents $ 5 $ 5 Real estate 1 1 Equity securities 23 23 Debt securities 19 19 Total assets $ 48 $ 48
Master Trust Level 3 Rollforward	The following table provides a reconciliation of beginning and ending balances of Duke Energy Master Retirement Trust qualified pension and other post-retirement assets at fair value on a recurring basis where the determination of fair value includes significant unobservable inputs (Level 3). (in millions) 2021 2020 Balance at January 1 $ — $ 11 Sales — (12) Total gains and other, net — 1 Transfer of Level 3 assets from other classifications 95 — Balance at December 31 $ 95 $ —
Employee Savings Plan Matching Contributions	The following table includes pretax employer matching contributions made by Duke Energy and expensed by the Subsidiary Registrants. Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Years ended December 31, 2021 $ 229 $ 70 $ 60 $ 39 $ 21 $ 5 $ 12 $ 11 2020 213 67 57 38 19 5 11 13 2019 214 66 58 38 20 5 11 13
Pension Plan | Qualified Plan
Defined Benefit Plan Disclosure [Line Items]
Components of Net Periodic Pension Costs	Components of Net Periodic Pension Costs Year Ended December 31, 2021 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Service cost $ 176 $ 56 $ 50 $ 29 $ 21 $ 5 $ 10 $ 6 Interest cost on projected benefit obligation 220 51 70 30 39 13 18 7 Expected return on plan assets (558) (141) (187) (84) (102) (28) (40) (20) Amortization of actuarial loss 133 29 38 18 20 7 13 10 Amortization of prior service credit (29) (8) (2) (1) (1) (1) (2) (9) Amortization of settlement charges 9 5 2 2 1 — — 1 Net periodic pension costs (a)(b) $ (49) $ (8) $ (29) $ (6) $ (22) $ (4) $ (1) $ (5) Year Ended December 31, 2020 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Service cost $ 165 $ 51 $ 48 $ 27 $ 21 $ 5 $ 9 $ 6 Interest cost on projected benefit obligation 269 62 85 38 46 15 22 9 Expected return on plan assets (572) (145) (190) (87) (101) (28) (42) (21) Amortization of actuarial loss 128 28 41 18 23 6 12 9 Amortization of prior service credit (32) (8) (3) (2) (1) — (2) (9) Amortization of settlement charges 18 9 7 6 1 — 1 1 Net periodic pension costs (a)(b) $ (24) $ (3) $ (12) $ — $ (11) $ (2) $ — $ (5) Year Ended December 31, 2019 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Service cost $ 158 $ 49 $ 46 $ 26 $ 20 $ 4 $ 9 $ 5 Interest cost on projected benefit obligation 317 75 100 45 54 18 26 10 Expected return on plan assets (567) (147) (178) (88) (89) (28) (43) (22) Amortization of actuarial loss 108 24 39 15 24 4 8 8 Amortization of prior service credit (32) (8) (3) (2) (1) — (2) (9) Amortization of settlement charge 6 2 1 1 — 2 — — Net periodic pension costs (a)(b) $ (10) $ (5) $ 5 $ (3) $ 8 $ — $ (2) $ (8) (a) Duke Energy amounts exclude $3 million, $4 million and $4 million for the years ended December 2021, 2020 and 2019, respectively, of regulatory asset amortization resulting from purchase accounting adjustments associated with Duke Energy's merger with Cinergy in April 2006. (b) Duke Energy Ohio amounts exclude $1 million, $2 million and $2 million for the years ended December 2021, 2020 and 2019, respectively, of regulatory asset amortization resulting from purchase accounting adjustments associated with Duke Energy's merger with Cinergy in April 2006.
Amounts Recognized in AOCI and Regulatory Assets and Liabilities	Amounts Recognized in Accumulated Other Comprehensive Income and Regulatory Assets Year Ended December 31, 2021 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Regulatory assets, net decrease $ (261) $ (57) $ (128) $ (31) $ (97) $ (17) $ (19) $ (5) Accumulated other comprehensive loss (income) Deferred income tax expense $ 1 $ — $ — $ — $ — $ — $ — $ — Amortization of prior year service credit 1 — — — — — — — Amortization of prior year actuarial losses (8) — (1) — — — — — Net amount recognized in accumulated other comprehensive income $ (6) $ — $ (1) $ — $ — $ — $ — $ — Year Ended December 31, 2020 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Regulatory assets, net (decrease) increase $ (62) $ (39) $ (26) $ (30) $ 4 $ (2) $ 5 $ (1) Accumulated other comprehensive loss (income) Deferred income tax expense $ 2 $ — $ 1 $ — $ 1 $ — $ — $ — Amortization of prior year service credit 1 — — — — — — — Amortization of prior year actuarial losses (11) — (1) — (3) — — — Net amount recognized in accumulated other comprehensive income $ (8) $ — $ — $ — $ (2) $ — $ — $ —
Reconciliation of Funded Status to Net Amount Recognized	Reconciliation of Funded Status to Net Amount Recognized Year Ended December 31, 2021 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Change in Projected Benefit Obligation Obligation at prior measurement date $ 8,634 $ 1,988 $ 2,715 $ 1,193 $ 1,507 $ 502 $ 715 $ 293 Service cost 168 54 48 28 20 5 9 6 Interest cost 220 51 70 30 39 13 18 7 Actuarial gain (200) (42) (108) (18) (89) (10) (10) (5) Benefits paid (615) (148) (161) (80) (81) (50) (52) (28) Transfers — — (4) — (4) (10) — — Obligation at measurement date $ 8,207 $ 1,903 $ 2,560 $ 1,153 $ 1,392 $ 450 $ 680 $ 273 Accumulated Benefit Obligation at measurement date $ 8,144 $ 1,904 $ 2,529 $ 1,154 $ 1,361 $ 439 $ 672 $ 274 Change in Fair Value of Plan Assets Plan assets at prior measurement date $ 9,337 $ 2,381 $ 3,049 $ 1,422 $ 1,605 $ 472 $ 684 $ 343 Actual return on plan assets 513 132 169 79 90 26 37 19 Benefits paid (615) (148) (161) (80) (81) (50) (52) (28) Transfers — — (4) — (4) (10) — — Plan assets at measurement date $ 9,235 $ 2,365 $ 3,053 $ 1,421 $ 1,610 $ 438 $ 669 $ 334 Funded status of plan $ 1,028 $ 462 $ 493 $ 268 $ 218 $ (12) $ (11) $ 61 Year Ended December 31, 2020 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Change in Projected Benefit Obligation Obligation at prior measurement date $ 8,321 $ 1,923 $ 2,608 $ 1,170 $ 1,424 $ 481 $ 693 $ 292 Service cost 157 49 46 26 20 4 8 5 Interest cost 269 62 85 38 46 15 22 9 Actuarial loss 433 83 144 50 93 21 46 14 Benefits paid (541) (137) (160) (83) (76) (34) (49) (27) Benefits paid – settlements (5) — — — — — (5) — Transfers — 8 (8) (8) — 15 — — Obligation at measurement date $ 8,634 $ 1,988 $ 2,715 $ 1,193 $ 1,507 $ 502 $ 715 $ 293 Accumulated Benefit Obligation at measurement date $ 8,577 $ 1,989 $ 2,684 $ 1,194 $ 1,476 $ 493 $ 709 $ 294 Change in Fair Value of Plan Assets Plan assets at prior measurement date $ 8,910 $ 2,263 $ 2,898 $ 1,364 $ 1,515 $ 443 $ 667 $ 335 Actual return on plan assets 973 247 319 149 166 48 71 35 Benefits paid (541) (137) (160) (83) (76) (34) (49) (27) Benefits paid – settlements (5) — — — — — (5) — Transfers — 8 (8) (8) — 15 — — Plan assets at measurement date $ 9,337 $ 2,381 $ 3,049 $ 1,422 $ 1,605 $ 472 $ 684 $ 343 Funded status of plan $ 703 $ 393 $ 334 $ 229 $ 98 $ (30) $ (31) $ 50
Amounts Recognized in the Consolidated Balance Sheet	Amounts Recognized in the Consolidated Balance Sheets December 31, 2021 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Prefunded pension (a) $ 1,071 $ 462 $ 494 $ 268 $ 219 $ 74 $ 100 $ 61 Noncurrent pension liability (b) $ 43 $ — $ 1 $ — $ 1 $ 86 $ 111 $ — Net asset (liability) recognized $ 1,028 $ 462 $ 493 $ 268 $ 218 $ (12) $ (11) $ 61 Regulatory assets $ 1,649 $ 324 $ 563 $ 252 $ 311 $ 93 $ 190 $ 75 Accumulated other comprehensive (income) loss Deferred income tax benefit $ (20) $ — $ — $ — $ — $ — $ — $ — Prior service credit (1) — — — — — — — Net actuarial loss 92 — 1 — — — — — Net amounts recognized in accumulated other comprehensive loss $ 71 $ — $ 1 $ — $ — $ — $ — $ — December 31, 2020 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Prefunded pension (a) $ 780 $ 393 $ 379 $ 229 $ 143 $ 58 $ 79 $ 50 Noncurrent pension liability (b) $ 77 $ — $ 45 $ — $ 45 $ 88 $ 110 $ — Net asset (liability) recognized $ 703 $ 393 $ 334 $ 229 $ 98 $ (30) $ (31) $ 50 Regulatory assets $ 1,910 $ 381 $ 691 $ 283 $ 408 $ 110 $ 209 $ 80 Accumulated other comprehensive (income) loss Deferred income tax benefit $ (21) $ — $ — $ — $ — $ — $ — $ — Prior service credit (2) — — — — — — — Net actuarial loss 100 — 2 — — — — — Net amounts recognized in accumulated other comprehensive loss $ 77 $ — $ 2 $ — $ — $ — $ — $ — (a) Included in Other within Other Noncurrent Assets on the Consolidated Balance Sheets. (b) Included in Accrued pension and other post-retirement benefit costs on the Consolidated Balance Sheets.
Information for Plans with Accumulated Benefit Obligation in Excess of Plan Assets	Information for Plans with Accumulated Benefit Obligation in Excess of Plan Assets December 31, 2021 Duke Duke Energy Energy (in millions) Ohio Indiana Projected benefit obligation $ 153 $ 284 Accumulated benefit obligation 143 275 Fair value of plan assets 67 173 December 31, 2020 Duke Duke Duke Duke Progress Energy Energy Energy (in millions) Energy Energy Florida Ohio Indiana Projected benefit obligation $ 4,914 $ 828 $ 828 $ 184 $ 293 Accumulated benefit obligation 4,856 796 796 176 285 Fair value of plan assets 4,837 783 783 96 183
Assumptions Used for Pension Benefits Accounting	The following tables present the assumptions or range of assumptions used for pension benefit accounting. December 31, 2021 2020 2019 Benefit Obligations Discount rate 2.90% 2.60% 3.30% Interest crediting rate 4.00% 4.00% 4.00% Salary increase 3.50 % – 4.00% 3.50 % – 4.00% 3.50 % – 4.00% Net Periodic Benefit Cost Discount rate 2.60% 3.30% 4.30% Interest crediting rate 4.00% 4.00% 4.00% Salary increase 3.50 % – 4.00% 3.50 % – 4.00% 3.50 % – 4.00% Expected long-term rate of return on plan assets 6.50% 6.85% 6.85%
Expected Benefit Payments	Expected Benefit Payments Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Years ending December 31, 2022 $ 652 $ 174 $ 177 $ 95 $ 81 $ 37 $ 48 $ 27 2023 653 173 180 97 82 36 48 24 2024 645 171 181 96 84 35 47 23 2025 632 168 180 94 85 34 47 20 2026 605 155 176 90 86 33 45 21 2027-2031 2,705 655 818 389 426 149 218 85
Other Post-Retirement Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Components of Net Periodic Pension Costs	Components of Net Periodic Other Post-Retirement Benefit Costs Year Ended December 31, 2021 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Service cost $ 4 $ 1 $ 1 $ — $ — $ — $ 1 $ — Interest cost on accumulated post-retirement benefit obligation 18 4 7 4 3 1 1 1 Expected return on plan assets (11) (7) — — — — — (2) Amortization of actuarial loss 2 — 1 — 1 — 4 — Amortization of prior service credit (13) (4) (2) (1) (1) (1) (1) (2) Net periodic post-retirement benefit costs (a)(b) $ — $ (6) $ 7 $ 3 $ 3 $ — $ 5 $ (3) Year Ended December 31, 2020 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Service cost $ 4 $ 1 $ 1 $ — $ — $ — $ 1 $ — Interest cost on accumulated post-retirement benefit obligation 23 5 10 5 4 1 2 1 Expected return on plan assets (13) (8) — — — — — (2) Amortization of actuarial loss 2 — 1 — 1 — 4 — Amortization of prior service credit (14) (4) (3) (1) (2) (1) (1) (2) Net periodic post-retirement benefit costs (a)(b) $ 2 $ (6) $ 9 $ 4 $ 3 $ — $ 6 $ (3) Year Ended December 31, 2019 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Service cost $ 4 $ 1 $ 1 $ — $ 1 $ — $ 1 $ — Interest cost on accumulated post-retirement benefit obligation 30 7 12 7 5 1 3 1 Expected return on plan assets (12) (7) — — — — — (1) Amortization of actuarial loss 4 2 1 — 1 — 4 — Amortization of prior service credit (19) (5) (8) (1) (7) (1) (1) (2) Net periodic post-retirement benefit costs (a)(b) $ 7 $ (2) $ 6 $ 6 $ — $ — $ 7 $ (2) (a) Duke Energy amounts exclude $5 million, $6 million and $6 million for the years ended December 2021, 2020 and 2019, respectively, of regulatory asset amortization resulting from purchase accounting adjustments associated with Duke Energy's merger with Cinergy in April 2006. (b) Duke Energy Ohio amounts exclude $1 million, $1 million and $2 million for the years ended December 2021, 2020 and 2019, respectively, of regulatory asset amortization resulting from purchase accounting adjustments associated with Duke Energy's merger with Cinergy in April 2006.
Amounts Recognized in AOCI and Regulatory Assets and Liabilities	Amounts Recognized in Accumulated Other Comprehensive Income and Regulatory Assets and Liabilities Year Ended December 31, 2021 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Regulatory assets, net (decrease) increase $ (15) $ — $ (18) $ (9) $ (9) $ 4 $ (4) $ — Regulatory liabilities, net increase $ 23 $ 12 $ — $ — $ — $ 4 $ 1 $ 2 Accumulated other comprehensive (income) loss Amortization of prior year actuarial gain $ (1) $ — $ — $ — $ — $ — $ — $ — Net amount recognized in accumulated other comprehensive income $ (1) $ — $ — $ — $ — $ — $ — $ — Year Ended December 31, 2020 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Regulatory assets, net increase (decrease) $ 9 $ — $ 9 $ 6 $ 3 $ — $ (4) $ — Regulatory liabilities, net decrease $ (10) $ (7) $ — $ — $ — $ — $ (1) $ — Accumulated other comprehensive (income) loss Amortization of prior year service credit $ 1 $ — $ — $ — $ — $ — $ — $ — Net amount recognized in accumulated other comprehensive income $ 1 $ — $ — $ — $ — $ — $ — $ —
Reconciliation of Funded Status to Net Amount Recognized	Reconciliation of Funded Status to Accrued Other Post-Retirement Benefit Costs Year Ended December 31, 2021 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Change in Projected Benefit Obligation Accumulated post-retirement benefit obligation at prior measurement date $ 709 $ 174 $ 299 $ 166 $ 130 $ 27 $ 61 $ 30 Service cost 4 1 1 — — — 1 — Interest cost 18 4 7 4 3 1 1 1 Plan participants' contributions 14 3 5 3 2 1 2 — Actuarial gains (47) (14) (20) (10) (10) (1) (2) (2) Benefits paid (73) (19) (29) (16) (13) (3) (9) (2) Accumulated post-retirement benefit obligation at measurement date $ 625 $ 149 $ 263 $ 147 $ 112 $ 25 $ 54 $ 27 Change in Fair Value of Plan Assets Plan assets at prior measurement date $ 237 $ 139 $ (1) $ (2) $ (1) $ 9 $ 7 $ 37 Actual return on plan assets 15 9 — — — 1 — 3 Benefits paid (73) (19) (29) (16) (13) (3) (9) (2) Employer contributions 18 3 24 13 10 1 6 1 Plan participants' contributions 14 3 5 3 2 1 2 — Plan assets at measurement date $ 211 $ 135 $ (1) $ (2) $ (2) $ 9 $ 6 $ 39 Funded status of plan $ (414) $ (14) $ (264) $ (149) $ (114) $ (16) $ (48) $ 12 Year Ended December 31, 2020 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Change in Projected Benefit Obligation Accumulated post-retirement benefit obligation at prior measurement date $ 723 $ 175 $ 303 $ 168 $ 135 $ 29 $ 64 $ 30 Service cost 4 1 1 — — — 1 — Interest cost 23 5 10 5 4 1 2 1 Plan participants' contributions 15 3 5 3 2 1 2 — Actuarial losses 19 8 8 5 2 — 1 1 Benefits paid (75) (18) (28) (15) (13) (4) (9) (2) Accumulated post-retirement benefit obligation at measurement date $ 709 $ 174 $ 299 $ 166 $ 130 $ 27 $ 61 $ 30 Change in Fair Value of Plan Assets Plan assets at prior measurement date $ 220 $ 130 $ (1) $ (1) $ — $ 9 $ 5 $ 34 Actual return on plan assets 24 14 — — — — 1 4 Benefits paid (75) (18) (28) (15) (13) (4) (9) (2) Employer contributions 53 10 23 11 10 3 8 1 Plan participants' contributions 15 3 5 3 2 1 2 — Plan assets at measurement date $ 237 $ 139 $ (1) $ (2) $ (1) $ 9 $ 7 $ 37 Funded status of plan $ (472) $ (35) $ (300) $ (168) $ (131) $ (18) $ (54) $ 7
Amounts Recognized in the Consolidated Balance Sheet	Amounts Recognized in the Consolidated Balance Sheets December 31, 2021 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Prefunded post-retirement benefit $ 12 $ — $ — $ — $ — $ 1 $ — $ 12 Current post-retirement liability (a) 9 — 5 3 2 1 — — Noncurrent post-retirement liability (b) 417 14 259 146 112 16 48 — Net liability (asset) recognized $ 414 $ 14 $ 264 $ 149 $ 114 $ 16 $ 48 $ (12) Regulatory assets $ 129 $ — $ 126 $ 79 $ 47 $ 4 $ 28 $ — Regulatory liabilities $ 162 $ 44 $ — $ — $ — $ 21 $ 63 $ 5 Accumulated other comprehensive (income) loss Deferred income tax expense $ 3 $ — $ — $ — $ — $ — $ — $ — Prior service credit (1) — — — — — — — Net actuarial gain (14) — — — — — — — Net amounts recognized in accumulated other comprehensive income $ (12) $ — $ — $ — $ — $ — $ — $ — December 31, 2020 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Prefunded post-retirement benefit $ 8 $ — $ — $ — $ — $ 1 $ — $ 7 Current post-retirement liability (a) 9 — 6 4 2 2 — — Noncurrent post-retirement liability (b) 471 35 294 164 129 17 54 — Net liability (asset) recognized $ 472 $ 35 $ 300 $ 168 $ 131 $ 18 $ 54 $ (7) Regulatory assets $ 144 $ — $ 144 $ 88 $ 56 $ — $ 32 $ — Regulatory liabilities $ 139 $ 32 $ — $ — $ — $ 17 $ 62 $ 3 Accumulated other comprehensive (income) loss Deferred income tax expense $ 3 $ — $ — $ — $ — $ — $ — $ — Prior service credit (1) — — — — — — — Net actuarial gain (13) — — — — — — — Net amounts recognized in accumulated other comprehensive income $ (11) $ — $ — $ — $ — $ — $ — $ — (a) Included in Other within Current Liabilities on the Consolidated Balance Sheets. (b) Included in Accrued pension and other post-retirement benefit costs on the Consolidated Balance Sheets.
Assumptions Used for Pension Benefits Accounting	The following tables present the assumptions used for other post-retirement benefits accounting. December 31, 2021 2020 2019 Benefit Obligations Discount rate 2.90 % 2.60 % 3.30 % Net Periodic Benefit Cost Discount rate 2.60 % 3.30 % 4.30 % Expected long-term rate of return on plan assets 6.50 % 6.85 % 6.85 %
Expected Benefit Payments	Expected Benefit Payments Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Years ending December 31, 2022 $ 70 $ 17 $ 26 $ 15 $ 12 $ 3 $ 7 $ 2 2023 62 15 25 14 11 3 6 2 2024 58 14 23 13 11 3 6 2 2025 54 13 22 12 10 2 5 2 2026 50 12 21 12 9 2 5 2 2027-2031 207 50 87 49 38 8 19 10
Assumed Health Care Cost Trend Rate	Assumed Health Care Cost Trend Rate December 31, 2021 2020 Health care cost trend rate assumed for next year 6.25 % 6.25 % Rate to which the cost trend is assumed to decline (the ultimate trend rate) 4.75 % 4.75 % Year that rate reaches ultimate trend 2028 2028

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2021
Income Tax Disclosure [Abstract]
Schedule of Components of Income Tax Expense (Benefit)	Components of Income Tax Expense Year Ended December 31, 2021 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Current income taxes Federal $ (2) $ 241 $ (15) $ 113 $ (75) $ (8) $ 65 $ 23 State 2 23 (4) 8 (17) (2) 7 3 Foreign 2 — — — — — — — Total current income taxes 2 264 (19) 121 (92) (10) 72 26 Deferred income taxes Federal 199 (130) 203 (16) 202 35 19 17 State (1) (79) 47 (26) 77 5 16 (13) Total deferred income taxes (a) 198 (209) 250 (42) 279 40 35 4 ITC amortization (8) (4) (4) (4) — — — — Total income tax expense included in Consolidated Statements of Operations $ 192 $ 51 $ 227 $ 75 $ 187 $ 30 $ 107 $ 30 (a) Total deferred income taxes includes the generation of NOL carryforwards and tax credit carryforwards of $32 million at Duke Energy Carolinas, $8 million at Duke Energy Indiana, and $3 million at Piedmont. In addition, total deferred income taxes includes utilization of NOL carryforwards and tax credit carryforwards of $150 million at Duke Energy, $95 million at Progress Energy, $14 million at Duke Energy Progress, $64 million at Duke Energy Florida, and $2 million at Duke Energy Ohio. Year Ended December 31, 2020 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Current income taxes Federal $ (281) $ 314 $ 280 $ 181 $ 148 $ 10 $ 48 $ (27) State (9) 35 29 17 24 1 7 (8) Foreign 1 — — — — — — — Total current income taxes (289) 349 309 198 172 11 55 (35) Deferred income taxes Federal 155 (171) (167) (180) 1 30 12 60 State (92) (86) (24) (49) 25 2 17 (7) Total deferred income taxes (a) 63 (257) (191) (229) 26 32 29 53 ITC amortization (10) (4) (5) (5) — — — — Income tax (benefit) expense from continuing operations (236) 88 113 (36) 198 43 84 18 Tax expense from discontinued operations 2 — — — — — — — Total income tax (benefit) expense included in Consolidated Statements of Operations $ (234) $ 88 $ 113 $ (36) $ 198 $ 43 $ 84 $ 18 (a) Total deferred income taxes includes the generation of NOL carryforwards and tax credit carryforwards of $20 million at Duke Energy Carolinas, $3 million at Duke Energy Progress, $8 million at Duke Energy Indiana, and $11 million at Piedmont. In addition, total deferred income taxes includes utilization of NOL carryforwards and tax credit carryforwards of $39 million at Progress Energy, $30 million at Duke Energy Florida and $79 million at Duke Energy. Year Ended December 31, 2019 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Current income taxes Federal $ (299) $ 164 $ (173) $ (36) $ (43) $ (41) $ (23) $ (92) State 10 13 (7) (3) 18 (1) 1 (1) Foreign 2 — — — — — — — Total current income taxes (287) 177 (180) (39) (25) (42) (22) (93) Deferred income taxes Federal 855 175 422 220 153 77 128 133 State (38) (37) 17 (18) 27 5 28 3 Total deferred income taxes (a) 817 138 439 202 180 82 156 136 ITC amortization (11) (4) (6) (6) — — — — Income tax expense from continuing operations 519 311 253 157 155 40 134 43 Tax benefit from discontinued operations (2) — — — — — — — Total income tax expense included in Consolidated Statements of Operations $ 517 $ 311 $ 253 $ 157 $ 155 $ 40 $ 134 $ 43 (a) Total deferred income taxes includes the generation of tax credit carryforwards of $8 million at Duke Energy Carolinas. In addition, total deferred income taxes includes utilization of NOL carryforwards and tax credit carryforwards of $243 million at Progress Energy, $35 million at Duke Energy Progress, $152 million at Duke Energy Florida, $25 million at Duke Energy Ohio, $60 million at Duke Energy Indiana, $90 million at Piedmont and $775 million at Duke Energy.
Schedule of Income before Income Tax, Domestic and Foreign	Duke Energy Income from Continuing Operations before Income Taxes Years Ended December 31, (in millions) 2021 2020 2019 Domestic $ 3,720 $ 826 $ 4,053 Foreign 44 13 44 Income from continuing operations before income taxes $ 3,764 $ 839 $ 4,097
Summary of Effective Tax Rates	The following tables present a reconciliation of income tax expense at the U.S. federal statutory tax rate to the actual tax expense from continuing operations. Year Ended December 31, 2021 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Income tax expense, computed at the statutory rate of 21% $ 790 $ 291 $ 384 $ 224 $ 194 $ 49 $ 123 $ 71 State income tax, net of federal income tax effect 1 (44) 34 (14) 47 2 18 (8) Amortization of excess deferred income tax (438) (184) (174) (120) (54) (22) (34) (25) AFUDC equity income (34) (14) (11) (7) (3) (2) (4) (4) AFUDC equity depreciation 35 18 10 5 5 2 5 — Noncontrolling Interests 72 — — — — — — — Renewable energy PTCs (100) — — — — — — — Other tax credits (30) (12) (11) (8) (3) (1) (2) (4) Valuation Allowance (a) (85) — — — — — — — Other items, net (19) (4) (5) (5) 1 2 1 — Income tax expense from continuing operations $ 192 $ 51 $ 227 $ 75 $ 187 $ 30 $ 107 $ 30 Effective tax rate 5.1 % 3.7 % 12.4 % 7.0 % 20.2 % 12.8 % 18.2 % 8.8 % (a) In the fourth quarter of 2021, the company recognized a federal capital gain in the amount of $426 million. As a result, a valuation allowance of $85 million related to a federal capital loss carryforward was released. This valuation allowance was originally recorded as a result of the 2019 sale of minority interest of certain renewable assets within the Commercial Renewables segment. Year Ended December 31, 2020 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Income tax expense, computed at the statutory rate of 21% $ 176 $ 219 $ 243 $ 80 $ 204 $ 62 $ 103 $ 61 State income tax, net of federal income tax effect (80) (40) 4 (25) 39 2 19 (12) Amortization of excess deferred income tax (276) (82) (118) (68) (49) (20) (36) (21) AFUDC equity income (48) (13) (9) (6) (3) (2) (4) (10) AFUDC equity depreciation 103 19 10 5 5 1 4 — Noncontrolling Interests 62 — — — — — — — Renewable energy PTCs (110) — — — — — — — Other tax credits (37) (13) (16) (14) (2) (1) (3) (2) Tax true up (12) (3) 1 (5) 5 — (1) 1 Other items, net (14) 1 (2) (3) (1) 1 2 1 Income tax (benefit) expense from continuing operations $ (236) $ 88 $ 113 $ (36) $ 198 $ 43 $ 84 $ 18 Effective tax rate (28.1) % 8.4 % 9.7 % (9.5) % 20.4 % 14.6 % 17.1 % 6.2 % Year Ended December 31, 2019 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Income tax expense, computed at the statutory rate of 21% $ 860 $ 360 $ 332 $ 202 $ 178 $ 59 $ 120 $ 51 State income tax, net of federal income tax effect (22) (19) 8 (17) 35 3 22 2 Amortization of excess deferred income tax (121) (29) (64) (10) (54) (12) (6) (10) AFUDC equity income (52) (9) (14) (13) (1) (3) (3) — AFUDC equity depreciation 34 19 10 5 5 1 4 — Renewable energy PTCs (120) — — — — — — — Other tax credits (23) (11) (9) (7) (2) (1) (1) (1) Tax true up (64) (9) (8) (3) (5) (7) (1) — Other items, net 27 9 (2) — (1) — (1) 1 Income tax expense from continuing operations $ 519 $ 311 $ 253 $ 157 $ 155 $ 40 $ 134 $ 43 Effective tax rate 12.7 % 18.1 % 16.0 % 16.3 % 18.3 % 14.3 % 23.5 % 17.6 %
Schedule of Deferred Tax Assets and Liabilities	Net Deferred Income Tax Liability Components December 31, 2021 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Deferred credits and other liabilities $ 347 $ 121 $ 101 $ 60 $ 40 $ 19 $ 7 $ 18 Lease obligations 346 91 197 121 76 4 16 4 Pension, post-retirement and other employee benefits 207 (36) 30 17 7 11 20 (8) Progress Energy merger purchase accounting adjustments (a) 340 — — — — — — — Tax credits and NOL carryforwards 3,784 349 497 160 306 13 195 29 Regulatory liabilities and deferred credits — 11 — — — 16 — 6 Investments and other assets — — — — — 5 6 — Other 85 12 12 7 4 7 2 8 Valuation allowance (518) — — — — — — — Total deferred income tax assets 4,591 548 837 365 433 75 246 57 Investments and other assets (2,428) (1,205) (742) (610) (135) — — (39) Accelerated depreciation rates (10,391) (2,977) (3,891) (1,546) (2,382) (1,125) (1,496) (833) Regulatory assets and deferred debits, net (1,151) — (768) (417) (350) — (53) — Total deferred income tax liabilities (13,970) (4,182) (5,401) (2,573) (2,867) (1,125) (1,549) (872) Net deferred income tax liabilities $ (9,379) $ (3,634) $ (4,564) $ (2,208) $ (2,434) $ (1,050) $ (1,303) $ (815) (a) Primarily related to lease obligations and debt fair value adjustments. December 31, 2020 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Deferred credits and other liabilities $ 286 $ 85 $ 87 $ 67 $ 18 $ 21 $ 7 $ 38 Lease obligations 515 96 208 120 87 5 16 5 Pension, post-retirement and other employee benefits 236 (30) 68 24 38 16 26 (5) Progress Energy merger purchase accounting adjustments (a) 441 — — — — — — — Tax credits and NOL carryforwards 3,909 285 508 179 282 16 183 29 Regulatory liabilities and deferred credits — 11 — — — 18 — — Investments and other assets — — — — — 7 — Other 93 8 14 9 4 7 1 8 Valuation allowance (586) — — — — — — — Total deferred income tax assets 4,894 455 885 399 429 90 233 75 Investments and other assets (2,267) (1,127) (669) (507) (164) — (14) (48) Accelerated depreciation rates (10,729) (3,170) (3,868) (1,778) (2,124) (1,071) (1,433) (844) Regulatory assets and deferred debits, net (1,142) — (744) (412) (332) — (14) (4) Total deferred income tax liabilities (14,138) (4,297) (5,281) (2,697) (2,620) (1,071) (1,461) (896) Net deferred income tax liabilities $ (9,244) $ (3,842) $ (4,396) $ (2,298) $ (2,191) $ (981) $ (1,228) $ (821) (a) Primarily related to lease obligations and debt fair value adjustments.
Summary of Tax Credit Carryforwards	The following table presents the expiration of tax credits and NOL carryforwards. December 31, 2021 (in millions) Amount Expiration Year General Business Credits $ 2,312 2024 — 2041 Federal NOL carryforwards (a) 4 2024 — 2026 State carryforwards and credits (b) (e) 328 2022 — Indefinite Foreign NOL carryforwards (c) 12 2027 — 2037 Foreign Tax Credits (d) 1,128 2024 — 2027 Total tax credits and NOL carryforwards $ 3,784 (a) A valuation allowance of $4 million has been recorded on the Federal NOL carryforwards, as presented in the Net Deferred Income Tax Liability Components table. (b) A valuation allowance of $112 million has been recorded on the state NOL and attribute carryforwards, as presented in the Net Deferred Income Tax Liability Components table. (c) A valuation allowance of $12 million has been recorded on the foreign NOL carryforwards, as presented in the Net Deferred Income Tax Liability Components table. (d) A valuation allowance of $390 million has been recorded on the foreign tax credits, as presented in the Net Deferred Income Tax Liability Components table. (e) Indefinite carryforward for Federal NOLs, and NOLs for states that have adopted the Tax Act's NOL provisions, generated in tax years beginning after December 31, 2017.
Schedule of Unrecognized Tax Benefits Roll Forward	The following tables present changes to unrecognized tax benefits. Year Ended December 31, 2021 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Unrecognized tax benefits – January 1 $ 125 $ 10 $ 10 $ 6 $ 3 $ 1 $ 1 $ 1 Gross decreases – tax positions in prior periods (a) (86) — — — — — — — Gross increases – current period tax positions 12 3 5 4 1 — 1 3 Total changes (74) 3 5 4 1 — 1 3 Unrecognized tax benefits – December 31 $ 51 $ 13 $ 15 $ 10 $ 4 $ 1 $ 2 $ 4 (a) In the fourth quarter of 2021, the company recognized a federal capital gain in the amount of $426 million. As a result of the capital gain, a previously recorded unrecognized tax benefit related to the character of a taxable loss has been reversed. See note (a) under the Statutory Rate Reconciliation table for more details. Year Ended December 31, 2020 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Unrecognized tax benefits – January 1 $ 126 $ 8 $ 9 $ 6 $ 3 $ 1 $ 1 $ 4 Gross decreases – tax positions in prior periods (2) — — — — — — — Gross increases – current period tax positions 4 2 1 — — — — — Reduction due to lapse of statute of limitations (3) — — — — — — (3) Total changes (1) 2 1 — — — — (3) Unrecognized tax benefits – December 31 $ 125 $ 10 $ 10 $ 6 $ 3 $ 1 $ 1 $ 1 Year Ended December 31, 2019 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Unrecognized tax benefits – January 1 $ 24 $ 6 $ 9 $ 6 $ 3 $ 1 $ 1 $ 4 Unrecognized tax benefits increases 105 2 1 1 — — — — Gross decreases – tax positions in prior periods (3) — (1) (1) — — — — Total changes 102 2 — — — — — — Unrecognized tax benefits – December 31 $ 126 $ 8 $ 9 $ 6 $ 3 $ 1 $ 1 $ 4
Summary of Income Tax Contingencies	The following table includes additional information regarding the Duke Energy Registrants' unrecognized tax benefits at December 31, 2021. Duke Energy Registrants do not anticipate a material increase or decrease in unrecognized tax benefits within the next 12 months. December 31, 2021 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Amount that if recognized, would affect the effective tax rate or regulatory liability (a) $ 47 $ 13 $ 14 $ 10 $ 4 $ 1 $ 2 $ 4 (a) The Duke Energy Registrants are unable to estimate the specific amounts that would affect the ETR versus the regulatory liability.

Other Income and Expenses, Net

Other Income and Expenses, Net (Tables)	12 Months Ended
	Dec. 31, 2021
Other Income and Expenses [Abstract]
Schedule of Other Income and Expenses, Net	The components of Other income and expenses, net on the Consolidated Statements of Operations are as follows. Year Ended December 31, 2021 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Interest income $ 16 $ 4 $ 8 $ 6 $ 2 $ 4 $ 6 $ 19 AFUDC equity 171 65 51 34 16 7 27 20 Post in-service equity returns 39 21 16 16 — 1 1 — Nonoperating income, other 417 180 140 87 53 6 8 16 Other income and expense, net $ 643 $ 270 $ 215 $ 143 $ 71 $ 18 $ 42 $ 55 Year Ended December 31, 2020 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Interest income $ 32 $ 4 $ 8 $ 2 $ 6 $ 4 $ 6 $ 17 AFUDC equity 154 62 42 29 12 7 23 19 Post in-service equity returns 27 17 8 8 — 1 1 — Nonoperating income, other 240 94 71 36 35 4 7 15 Other income and expense, net $ 453 $ 177 $ 129 $ 75 $ 53 $ 16 $ 37 $ 51 Year Ended December 31, 2019 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Interest income $ 31 $ 1 $ 11 $ — $ 11 $ 10 $ 10 $ 1 AFUDC equity 139 42 66 60 6 13 18 — Post in-service equity returns 29 20 7 7 — 1 — — Nonoperating income, other 231 88 57 33 31 — 13 19 Other income and expense, net $ 430 $ 151 $ 141 $ 100 $ 48 $ 24 $ 41 $ 20

Summary of Significant Accoun_4

Summary of Significant Accounting Policies (Other Assets and Liabilities) (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Current Liabilities
Organization And Basis Of Presentation [Line Items]
Accrued compensation	$ 915	$ 662
Other accrued liabilities	649	1,455
Duke Energy Carolinas | Current Liabilities
Organization And Basis Of Presentation [Line Items]
Accrued compensation	277	213
Duke Energy Progress | Current Liabilities
Organization And Basis Of Presentation [Line Items]
Other accrued liabilities	163	132
Customer deposits	144	144
Duke Energy Florida | Current Liabilities
Organization And Basis Of Presentation [Line Items]
Other accrued liabilities	89	81
Customer deposits	200	203
Duke Energy Ohio | Current Liabilities
Organization And Basis Of Presentation [Line Items]
Collateral liabilities	57	41
Duke Energy Ohio | Current Assets
Organization And Basis Of Presentation [Line Items]
Gas Storage	$ 25	$ 21

Summary of Significant Accoun_5

Summary of Significant Accounting Policies (Noncontrolling Interest) (Details) $ in Millions	Sep. 08, 2021USD ($)	Jan. 28, 2021USD ($)closing	Dec. 31, 2021USD ($)	[1]	Dec. 31, 2019USD ($)asset
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Sale of noncontrolling interest			$ 999		$ 407	[2]
Noncontrolling Interests
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Sale of noncontrolling interest			$ 454		863	[2]
Noncontrolling Interests | Renewables
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Value of sale of parent interest					415
Ownership interest change					466
Tax benefit from sale of interest					$ 8
Noncontrolling Interests | Wind and Solar Storage
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Percentage sold					49.00%
Number of assets sold | asset					37
Noncontrolling Interests | Operating Solar Assets
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Percentage sold					33.00%
Number of assets sold | asset					11
Noncontrolling Interests | Duke Energy Indiana
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Value of sale of parent interest	$ 1,025
Percentage sold		19.90%
Number of closings | closing		2
Ownership interest sold	11.05%
Proceed of purchase price for exchange in interest	50.00%	50.00%
Transaction costs	$ 27
Sale of noncontrolling interest	$ 545
Noncontrolling Interests | Duke Energy Indiana
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Value of sale of parent interest		$ 2,000
Percentage sold		19.90%
[1]	Relates to the sale of a noncontrolling interest in Duke Energy Indiana. See Note 1 for additional discussion
[2]	Relates to the sale of a noncontrolling interest in the Commercial Renewables segment. See Note 1 for additional discussion of the transaction.

Summary of Significant Accoun_6

Summary of Significant Accounting Policies (Schedule of Cash Received and Allocated Losses from Subsidiaries, Noncontrolling Interest) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Allocated losses to noncontrolling tax equity members utilizing the HLBV method	$ 298	$ 271	$ 165
Allocated losses to noncontrolling members based on pro rata shares of ownership	31	24	12
Total Noncontrolling Interest Allocated Losses	$ 329	$ 295	$ 177

Summary of Significant Accoun_7

Summary of Significant Accounting Policies (Schedule of Cash and Cash Equivalents) (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Current Assets
Cash and cash equivalents	$ 343	$ 259
Other	170	194
Other Noncurrent Assets
Other	7	103
Total cash, cash equivalents and restricted cash	520	556	$ 573	$ 591
Duke Energy Carolinas
Current Assets
Cash and cash equivalents	7	21
Other Noncurrent Assets
Other	1
Total cash, cash equivalents and restricted cash	8	21	18	33
Progress Energy
Current Assets
Cash and cash equivalents	70	59
Other	39	39
Other Noncurrent Assets
Other	4	102
Total cash, cash equivalents and restricted cash	113	200	126	112
Duke Energy Progress
Current Assets
Cash and cash equivalents	35	39
Other Noncurrent Assets
Other	4
Total cash, cash equivalents and restricted cash	39	39	22	23
Duke Energy Florida
Current Assets
Cash and cash equivalents	23	11
Other	39	39
Other Noncurrent Assets
Total cash, cash equivalents and restricted cash	$ 62	$ 50	$ 56	$ 75

Summary of Significant Accoun_8

Summary of Significant Accounting Policies (Inventory) (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Public Utilities, Inventory [Line Items]
Materials and supplies	$ 2,397	$ 2,312
Coal	486	561
Natural gas, oil and other	316	294
Total inventory	3,199	3,167
Duke Energy Carolinas
Public Utilities, Inventory [Line Items]
Materials and supplies	793	785
Coal	195	186
Natural gas, oil and other	38	39
Total inventory	1,026	1,010
Progress Energy
Public Utilities, Inventory [Line Items]
Materials and supplies	1,067	999
Coal	167	193
Natural gas, oil and other	164	183
Total inventory	1,398	1,375
Duke Energy Progress
Public Utilities, Inventory [Line Items]
Materials and supplies	729	673
Coal	94	131
Natural gas, oil and other	98	107
Total inventory	921	911
Duke Energy Florida
Public Utilities, Inventory [Line Items]
Materials and supplies	338	325
Coal	73	63
Natural gas, oil and other	66	76
Total inventory	477	464
Duke Energy Ohio
Public Utilities, Inventory [Line Items]
Materials and supplies	80	78
Coal	19	16
Natural gas, oil and other	17	16
Total inventory	116	110
Duke Energy Indiana
Public Utilities, Inventory [Line Items]
Materials and supplies	311	307
Coal	105	165
Natural gas, oil and other	2	1
Total inventory	418	473
Piedmont
Public Utilities, Inventory [Line Items]
Materials and supplies	14	12
Natural gas, oil and other	95	56
Total inventory	$ 109	$ 68

Summary of Significant Accoun_9

Summary of Significant Accounting Policies (Property, Plant and Equipment) (Details)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Public Utility, Property, Plant and Equipment [Line Items]
Weighted-average depreciation rate	2.90%	3.00%	3.10%
Duke Energy Carolinas
Public Utility, Property, Plant and Equipment [Line Items]
Weighted-average depreciation rate	2.70%	2.80%	2.80%
Progress Energy
Public Utility, Property, Plant and Equipment [Line Items]
Weighted-average depreciation rate	3.10%	3.20%	3.10%
Duke Energy Progress
Public Utility, Property, Plant and Equipment [Line Items]
Weighted-average depreciation rate	3.00%	3.10%	3.10%
Duke Energy Florida
Public Utility, Property, Plant and Equipment [Line Items]
Weighted-average depreciation rate	3.30%	3.30%	3.10%
Duke Energy Ohio
Public Utility, Property, Plant and Equipment [Line Items]
Weighted-average depreciation rate	2.90%	2.90%	2.60%
Duke Energy Indiana
Public Utility, Property, Plant and Equipment [Line Items]
Weighted-average depreciation rate	3.60%	3.50%	3.30%
Piedmont
Public Utility, Property, Plant and Equipment [Line Items]
Weighted-average depreciation rate	2.10%	2.30%	2.40%

Summary of Significant Accou_10

Summary of Significant Accounting Policies (Accounts Payable and Supplier Invoices Sold) (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Payables [Line Items]
Outstanding Accounts Payable Balance Sold	$ 19	$ 15
Suppliers Invoices Settled Through The Program	122	45
Progress Energy
Payables [Line Items]
Outstanding Accounts Payable Balance Sold	9
Suppliers Invoices Settled Through The Program	10
Duke Energy Florida
Payables [Line Items]
Outstanding Accounts Payable Balance Sold	9
Suppliers Invoices Settled Through The Program	10
Duke Energy Ohio
Payables [Line Items]
Outstanding Accounts Payable Balance Sold	6	1
Suppliers Invoices Settled Through The Program	12	9
Piedmont
Payables [Line Items]
Outstanding Accounts Payable Balance Sold	4	14
Suppliers Invoices Settled Through The Program	$ 100	$ 36

Summary of Significant Accou_11

Summary of Significant Accounting Policies (Excise Taxes) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Organization And Basis Of Presentation [Line Items]
Excise taxes	$ 420	$ 415	$ 421
Duke Energy Carolinas
Organization And Basis Of Presentation [Line Items]
Excise taxes	44	43	39
Progress Energy
Organization And Basis Of Presentation [Line Items]
Excise taxes	250	249	256
Duke Energy Progress
Organization And Basis Of Presentation [Line Items]
Excise taxes	22	26	21
Duke Energy Florida
Organization And Basis Of Presentation [Line Items]
Excise taxes	228	223	235
Duke Energy Ohio
Organization And Basis Of Presentation [Line Items]
Excise taxes	102	96	101
Duke Energy Indiana
Organization And Basis Of Presentation [Line Items]
Excise taxes	23	25	23
Piedmont
Organization And Basis Of Presentation [Line Items]
Excise taxes	$ 1	$ 2	$ 2

Summary of Significant Accou_12

Summary of Significant Accounting Policies (Expected Reserve for Credit Losses) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total pretax impact to Retained Earnings	$ 47,951	$ 51,136	$ 49,184	$ 43,834
Accounting Standards Update [Extensible List]	ASU 2016-13
Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total pretax impact to Retained Earnings	$ 4,108	3,265	2,471	3,113
Cumulative Effect, Period of Adoption, Adjustment | Revision of Prior Period, Accounting Standards Update, Adjustment | Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total pretax impact to Retained Earnings			120
Duke Energy Carolinas | Cumulative Effect, Period of Adoption, Adjustment | Revision of Prior Period, Accounting Standards Update, Adjustment | Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total pretax impact to Retained Earnings			16
Progress Energy
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total pretax impact to Retained Earnings	15,593	17,148	16,241	14,257
Progress Energy | Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total pretax impact to Retained Earnings	$ 6,465	$ 8,007	7,109	$ 5,131
Progress Energy | Cumulative Effect, Period of Adoption, Adjustment | Revision of Prior Period, Accounting Standards Update, Adjustment | Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total pretax impact to Retained Earnings			2
Duke Energy Progress | Cumulative Effect, Period of Adoption, Adjustment | Revision of Prior Period, Accounting Standards Update, Adjustment | Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total pretax impact to Retained Earnings			1
Duke Energy Florida | Cumulative Effect, Period of Adoption, Adjustment | Revision of Prior Period, Accounting Standards Update, Adjustment | Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total pretax impact to Retained Earnings			1
Piedmont | Cumulative Effect, Period of Adoption, Adjustment | Revision of Prior Period, Accounting Standards Update, Adjustment | Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total pretax impact to Retained Earnings			$ 1

Business Segments (Business Seg

Business Segments (Business Segment Data) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Segment Reporting Information, Profit (Loss) [Abstract]
Revenues	$ 25,097	$ 23,868	$ 25,079
Interest expense	2,280	2,162	2,204
Depreciation and amortization	4,990	4,705	4,548
Equity in earnings (losses) of unconsolidated affiliates	28	(2,005)	162
Income tax expense (benefit) from continuing operations	192	(236)	519
Segment income (loss)	3,795	1,263	3,714
Less noncontrolling interest	329	295	177
Add back preferred stock dividend	106	107	41
Loss from discontinued operations, net of tax	7	7	(7)
Net income	3,579	1,082	3,571
Net (loss) income attributable to Duke Energy	3,908	1,377	3,748
Capital expenditures	9,752	10,421	11,446
Segment assets	169,587	162,388	158,838
Segment Reporting Information Assets [Abstract]
Impairment of assets and other charges	356	984	(8)
Total income (loss) from continuing operations before income taxes	3,764	839	4,097
Nonregulated electric and other	770	765	705
Income (loss) attributable to noncontrolling interest	(329)	(295)	(177)
Duke Energy Ohio
Segment Reporting Information, Profit (Loss) [Abstract]
Revenues	2,037	1,858	1,940
Interest expense	111	102	109
Depreciation and amortization	307	278	265
Income tax expense (benefit) from continuing operations	30	43	40
Segment income (loss)	204	252	239
Loss from discontinued operations, net of tax			(1)
Net (loss) income attributable to Duke Energy	204	252	238
Capital expenditures	848	834	952
Segment assets	10,774	10,025	9,338
Segment Reporting Information Assets [Abstract]
Impairment of assets and other charges	25
Total income (loss) from continuing operations before income taxes	234	295	279
Duke Energy Carolinas
Segment Reporting Information, Profit (Loss) [Abstract]
Revenues	7,102	7,015	7,395
Interest expense	538	487	463
Depreciation and amortization	1,468	1,462	1,388
Income tax expense (benefit) from continuing operations	51	88	311
Net (loss) income attributable to Duke Energy	1,336	956	1,403
Segment assets	47,162	45,048
Segment Reporting Information Assets [Abstract]
Impairment of assets and other charges	227	476	17
Total income (loss) from continuing operations before income taxes	1,387	1,044	1,714
Duke Energy Progress
Segment Reporting Information, Profit (Loss) [Abstract]
Revenues	5,780	5,422	5,957
Interest expense	306	269	306
Depreciation and amortization	1,097	1,116	1,143
Income tax expense (benefit) from continuing operations	75	(36)	157
Net (loss) income attributable to Duke Energy	991	415	805
Segment assets	35,383	33,733
Segment Reporting Information Assets [Abstract]
Impairment of assets and other charges	63	499	12
Total income (loss) from continuing operations before income taxes	1,066	379	962
Eliminations
Segment Reporting Information, Profit (Loss) [Abstract]
Revenues	(205)	(199)	(200)
Interest expense	(9)	(16)	(58)
Depreciation and amortization	(26)	(29)	(5)
Segment assets			188
Eliminations | Duke Energy Ohio
Segment Reporting Information, Profit (Loss) [Abstract]
Segment assets	(29)	(2)
Electric Utilities and Infrastructure
Segment Reporting Information, Profit (Loss) [Abstract]
Revenues	22,570	21,687	22,798
Equity in earnings (losses) of unconsolidated affiliates	7	(1)	9
Segment Reporting Information Assets [Abstract]
After tax impairment charge		948
Reduction of prior year impairment		152
Shareholder contribution expense		16
Electric Utilities and Infrastructure | Gas Pipeline Assets
Segment Reporting Information Assets [Abstract]
After tax impairment charge		5
Electric Utilities and Infrastructure | Clemson University Combined Heat and Power Plant
Segment Reporting Information Assets [Abstract]
After tax impairment charge		19
Electric Utilities and Infrastructure | Operating Segments
Segment Reporting Information, Profit (Loss) [Abstract]
Revenues	22,603	21,720	22,831
Interest expense	1,432	1,320	1,345
Depreciation and amortization	4,251	4,068	3,951
Equity in earnings (losses) of unconsolidated affiliates	7	(1)	9
Income tax expense (benefit) from continuing operations	494	340	785
Segment income (loss)	3,850	2,669	3,536
Capital expenditures	7,653	7,629	8,263
Segment assets	143,841	138,225	135,561
Segment Reporting Information Assets [Abstract]
Reduction of prior year impairment			27
Electric Utilities and Infrastructure | Operating Segments | Duke Energy Ohio
Segment Reporting Information, Profit (Loss) [Abstract]
Revenues	1,493	1,405	1,456
Interest expense	87	85	80
Depreciation and amortization	217	200	182
Income tax expense (benefit) from continuing operations	15	19	20
Segment income (loss)	141	162	159
Capital expenditures	486	548	680
Segment assets	6,882	6,615	6,188
Electric Utilities and Infrastructure | Operating Segments | Duke Energy Carolinas | Impairment Charges
Segment Reporting Information Assets [Abstract]
Impairment of assets and other charges	160
Electric Utilities and Infrastructure | Operating Segments | Duke Energy Carolinas | Other Income and Expense
Segment Reporting Information Assets [Abstract]
Total income (loss) from continuing operations before income taxes	77
Electric Utilities and Infrastructure | Operating Segments | Duke Energy Carolinas | Operation, Maintenance and Other
Segment Reporting Information Assets [Abstract]
Total income (loss) from continuing operations before income taxes	5
Electric Utilities and Infrastructure | Operating Segments | Duke Energy Carolinas | Regulated Operating Revenue, Electric, Non-Nuclear
Segment Reporting Information Assets [Abstract]
Total income (loss) from continuing operations before income taxes	13
Electric Utilities and Infrastructure | Operating Segments | Duke Energy Carolinas | Interest Expense
Segment Reporting Information Assets [Abstract]
Total income (loss) from continuing operations before income taxes	3
Electric Utilities and Infrastructure | Operating Segments | Duke Energy Carolinas | Depreciation and amortization
Segment Reporting Information Assets [Abstract]
Total income (loss) from continuing operations before income taxes	6
Electric Utilities and Infrastructure | Operating Segments | Duke Energy Progress | Impairment Charges
Segment Reporting Information Assets [Abstract]
Impairment of assets and other charges	42
Electric Utilities and Infrastructure | Operating Segments | Duke Energy Progress | Other Income and Expense
Segment Reporting Information Assets [Abstract]
Total income (loss) from continuing operations before income taxes	34
Electric Utilities and Infrastructure | Operating Segments | Duke Energy Progress | Operation, Maintenance and Other
Segment Reporting Information Assets [Abstract]
Total income (loss) from continuing operations before income taxes	7
Electric Utilities and Infrastructure | Operating Segments | Duke Energy Progress | Regulated Operating Revenue, Electric, Non-Nuclear
Segment Reporting Information Assets [Abstract]
Total income (loss) from continuing operations before income taxes	15
Electric Utilities and Infrastructure | Operating Segments | Duke Energy Progress | Interest Expense
Segment Reporting Information Assets [Abstract]
Total income (loss) from continuing operations before income taxes	5
Electric Utilities and Infrastructure | Operating Segments | Duke Energy Progress | Depreciation and amortization
Segment Reporting Information Assets [Abstract]
Total income (loss) from continuing operations before income taxes	1
Electric Utilities and Infrastructure | Eliminations
Segment Reporting Information, Profit (Loss) [Abstract]
Revenues	33	33	33
Gas Utilities and Infrastructure
Segment Reporting Information, Profit (Loss) [Abstract]
Revenues	2,022	1,653	1,770
Equity in earnings (losses) of unconsolidated affiliates	8	(2,017)	114
Segment Reporting Information Assets [Abstract]
After tax impairment charge		7
Gas Utilities and Infrastructure | After-tax impairment charge
Segment Reporting Information, Profit (Loss) [Abstract]
Equity in earnings (losses) of unconsolidated affiliates		2,100
Segment Reporting Information Assets [Abstract]
After tax impairment charge			19
Gas Utilities and Infrastructure | Operating Segments
Segment Reporting Information, Profit (Loss) [Abstract]
Revenues	2,112	1,748	1,866
Interest expense	142	135	117
Depreciation and amortization	303	258	256
Equity in earnings (losses) of unconsolidated affiliates	8	(2,017)	114
Income tax expense (benefit) from continuing operations	55	(349)	22
Segment income (loss)	396	(1,266)	432
Capital expenditures	1,271	1,309	1,539
Segment assets	15,179	13,849	13,921
Gas Utilities and Infrastructure | Operating Segments | Duke Energy Ohio
Segment Reporting Information, Profit (Loss) [Abstract]
Revenues	544	453	484
Interest expense	24	17	29
Depreciation and amortization	90	78	83
Income tax expense (benefit) from continuing operations	19	26	21
Segment income (loss)	78	96	85
Capital expenditures	362	286	272
Segment assets	3,892	3,380	3,116
Gas Utilities and Infrastructure | Operating Segments | Gas Pipeline Assets
Segment Reporting Information, Profit (Loss) [Abstract]
Equity in earnings (losses) of unconsolidated affiliates	20
Gas Utilities and Infrastructure | Eliminations
Segment Reporting Information, Profit (Loss) [Abstract]
Revenues	90	95	96
Commercial Renewables
Segment Reporting Information, Profit (Loss) [Abstract]
Revenues	476	502	487
Equity in earnings (losses) of unconsolidated affiliates	(34)		(4)
Commercial Renewables | Operating Segments
Segment Reporting Information, Profit (Loss) [Abstract]
Revenues	476	502	487
Interest expense	72	66	95
Depreciation and amortization	225	199	168
Equity in earnings (losses) of unconsolidated affiliates	(34)		(4)
Income tax expense (benefit) from continuing operations	(78)	(65)	(115)
Segment income (loss)	201	286	198
Capital expenditures	543	1,219	1,423
Segment assets	6,977	6,716	6,020
Commercial Renewables | Operating Segments | Texas Storm Uri
Segment Reporting Information, Profit (Loss) [Abstract]
Equity in earnings (losses) of unconsolidated affiliates	29
Segment Reporting Information Assets [Abstract]
Total income (loss) from continuing operations before income taxes	(35)
Nonregulated electric and other	8
Income (loss) attributable to noncontrolling interest	(12)
Commercial Renewables | Operating Segments | Texas Storm Uri | Operation, Maintenance and Other
Segment Reporting Information Assets [Abstract]
Total income (loss) from continuing operations before income taxes	2
Total Reportable Segments
Segment Reporting Information, Profit (Loss) [Abstract]
Revenues	25,068	23,842	25,055
Total Reportable Segments | Operating Segments
Segment Reporting Information, Profit (Loss) [Abstract]
Revenues	25,191	23,970	25,184
Interest expense	1,646	1,521	1,557
Depreciation and amortization	4,779	4,525	4,375
Equity in earnings (losses) of unconsolidated affiliates	(19)	(2,018)	119
Income tax expense (benefit) from continuing operations	471	(74)	692
Segment income (loss)	4,447	1,689	4,166
Capital expenditures	9,467	10,157	11,225
Segment assets	165,997	158,790	155,502
Total Reportable Segments | Operating Segments | Duke Energy Ohio
Segment Reporting Information, Profit (Loss) [Abstract]
Revenues	2,037	1,858	1,940
Interest expense	111	102	109
Depreciation and amortization	307	278	265
Income tax expense (benefit) from continuing operations	34	45	41
Segment income (loss)	219	258	244
Capital expenditures	848	834	952
Segment assets	10,774	9,995	9,304
Total Reportable Segments | Eliminations
Segment Reporting Information, Profit (Loss) [Abstract]
Revenues	123	128	129
Other
Segment Reporting Information, Profit (Loss) [Abstract]
Revenues	29	26	24
Segment Reporting Information Assets [Abstract]
Severance charge reversal		98
Other | Operating Segments | Duke Energy Carolinas | Impairment Charges
Segment Reporting Information Assets [Abstract]
Impairment of assets and other charges	133
Other | Operating Segments | Duke Energy Progress | Operation, Maintenance and Other
Segment Reporting Information Assets [Abstract]
Total income (loss) from continuing operations before income taxes	42
Other | Operating Segments | Duke Energy Progress | Depreciation and amortization
Segment Reporting Information Assets [Abstract]
Total income (loss) from continuing operations before income taxes	17
Other | Other
Segment Reporting Information, Profit (Loss) [Abstract]
Revenues	111	97	95
Interest expense	643	657	705
Depreciation and amortization	237	209	178
Equity in earnings (losses) of unconsolidated affiliates	47	13	43
Income tax expense (benefit) from continuing operations	(279)	(162)	(173)
Segment income (loss)	(652)	(426)	(452)
Capital expenditures	285	264	221
Segment assets	3,590	3,598	3,148
Other | Other | Duke Energy Ohio
Segment Reporting Information, Profit (Loss) [Abstract]
Income tax expense (benefit) from continuing operations	(4)	(2)	(1)
Segment income (loss)	(15)	(6)	(5)
Segment assets	29	32	34
Other | Eliminations
Segment Reporting Information, Profit (Loss) [Abstract]
Revenues	$ 82	$ 71	$ 71

Business Segments (Narrative) (

Business Segments (Narrative) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2021USD ($)segment	Dec. 31, 2020USD ($)	Dec. 31, 2019USD ($)
Segment Reporting Information [Line Items]
Revenues	$ 25,097	$ 23,868	$ 25,079
Duke Energy Progress
Segment Reporting Information [Line Items]
Revenues	$ 5,780	5,422	5,957
Number of reportable segments | segment	1
Duke Energy Ohio
Segment Reporting Information [Line Items]
Revenues	$ 2,037	$ 1,858	$ 1,940
Number of reportable segments | segment	2
Revenues | Duke Energy Progress | Customer Concentration | One customer
Segment Reporting Information [Line Items]
Revenues	$ 586

Business Segments (Schedule of

Business Segments (Schedule of Revenue, By Products and Services) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Segment Reporting Information [Line Items]
Revenues	$ 25,097	$ 23,868	$ 25,079
Electric Utilities and Infrastructure
Segment Reporting Information [Line Items]
Revenues	22,570	21,687	22,798
Gas Utilities and Infrastructure
Segment Reporting Information [Line Items]
Revenues	2,022	1,653	1,770
Commercial Renewables
Segment Reporting Information [Line Items]
Revenues	476	502	487
Total Reportable Segments
Segment Reporting Information [Line Items]
Revenues	25,068	23,842	25,055
Retail Electric
Segment Reporting Information [Line Items]
Revenues	19,410	18,898	19,745
Retail Electric | Electric Utilities and Infrastructure
Segment Reporting Information [Line Items]
Revenues	19,410	18,898	19,745
Wholesale Electric
Segment Reporting Information [Line Items]
Revenues	2,627	2,312	2,620
Wholesale Electric | Electric Utilities and Infrastructure
Segment Reporting Information [Line Items]
Revenues	2,216	1,878	2,231
Wholesale Electric | Commercial Renewables
Segment Reporting Information [Line Items]
Revenues	411	434	389
Retail Natural Gas
Segment Reporting Information [Line Items]
Revenues	2,025	1,691	1,782
Retail Natural Gas | Gas Utilities and Infrastructure
Segment Reporting Information [Line Items]
Revenues	2,025	1,691	1,782
Other
Segment Reporting Information [Line Items]
Revenues	1,129	1,069	1,037
Other | Electric Utilities and Infrastructure
Segment Reporting Information [Line Items]
Revenues	977	944	855
Other | Gas Utilities and Infrastructure
Segment Reporting Information [Line Items]
Revenues	87	57	84
Other | Commercial Renewables
Segment Reporting Information [Line Items]
Revenues	65	68	98
Operating Segments | Electric Utilities and Infrastructure
Segment Reporting Information [Line Items]
Revenues	22,603	21,720	22,831
Operating Segments | Gas Utilities and Infrastructure
Segment Reporting Information [Line Items]
Revenues	2,112	1,748	1,866
Operating Segments | Commercial Renewables
Segment Reporting Information [Line Items]
Revenues	476	502	487
Operating Segments | Total Reportable Segments
Segment Reporting Information [Line Items]
Revenues	$ 25,191	$ 23,970	$ 25,184

Regulatory Matters (Schedule of

Regulatory Matters (Schedule of Regulatory Assets and Liabilities) (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	$ 14,637	$ 14,062
Less: current portion	2,150	1,641
Total noncurrent regulatory assets	12,487	12,421
Total regulatory liabilities	17,363	16,406
Less: current portion	1,211	1,377
Total noncurrent regulatory liabilities	16,152	15,029
Net regulatory liability related to income taxes
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities	7,199	7,368
Costs of removal
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities	6,150	5,883
AROs – nuclear and other
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities	2,053	1,512
Provision for rate refunds
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities	274	344
Hedge cost deferrals
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities	271	24
Accrued pension and OPEB
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities	213	177
Other
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities	1,203	1,098
AROs – coal ash
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	3,408	3,408
AROs – nuclear and other
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	684	754
Accrued pension and OPEB
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	2,017	2,317
Deferred fuel and purchased power
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	1,253	213
Storm cost securitized balance, net
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	991
Nuclear asset securitized balance, net
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	937	991
Debt fair value adjustment
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	884	950
Retired generation facilities
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	357	417
Post-in-service carrying costs (PISCC) and deferred operating expenses
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	356	397
Hedge cost deferrals
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	348	351
Deferred asset – Lee and Harris COLA
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	317	356
Advanced metering infrastructure (AMI)
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	311	311
Customer connect project
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	242	136
Demand side management (DSM)/Energy efficiency (EE)
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	235	242
Vacation accrual
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	221	221
Storm cost deferrals
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	213	1,102
NCEMPA deferrals
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	165	124
CEP deferral
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	161	117
Derivatives – natural gas supply contracts
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	139	122
COR settlement
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	123	128
Nuclear deferral
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	120	123
Deferred pipeline integrity costs
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	108	92
Costs of removal
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	107
Manufactured gas plant (MGP)
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	104	104
Qualifying facility contract buyouts
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	94	107
ABSAT, coal ash basin closure
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	90	98
Incremental COVID-19 expenses
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	87	76
Amounts due from customers
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	85	110
Deferred severance charges
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	54	86
Other
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	426	609
Progress Energy
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	6,939	6,533
Less: current portion	1,030	758
Total noncurrent regulatory assets	5,909	5,775
Total regulatory liabilities	6,044	5,691
Less: current portion	478	640
Total noncurrent regulatory liabilities	5,566	5,051
Progress Energy | Net regulatory liability related to income taxes
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities	2,394	2,411
Progress Energy | Costs of removal
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities	2,955	2,666
Progress Energy | Provision for rate refunds
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities	87	123
Progress Energy | Hedge cost deferrals
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities	117	8
Progress Energy | Other
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities	491	483
Progress Energy | AROs – coal ash
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	1,399	1,357
Progress Energy | AROs – nuclear and other
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	620	685
Progress Energy | Accrued pension and OPEB
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	725	875
Progress Energy | Deferred fuel and purchased power
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	718	162
Progress Energy | Storm cost securitized balance, net
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	759
Progress Energy | Nuclear asset securitized balance, net
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	937	991
Progress Energy | Retired generation facilities
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	265	363
Progress Energy | Post-in-service carrying costs (PISCC) and deferred operating expenses
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	47	51
Progress Energy | Hedge cost deferrals
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	137	148
Progress Energy | Deferred asset – Lee and Harris COLA
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	21	32
Progress Energy | Advanced metering infrastructure (AMI)
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	130	102
Progress Energy | Customer connect project
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	124	55
Progress Energy | Demand side management (DSM)/Energy efficiency (EE)
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	230	241
Progress Energy | Vacation accrual
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	42	42
Progress Energy | Storm cost deferrals
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	189	893
Progress Energy | NCEMPA deferrals
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	165	124
Progress Energy | COR settlement
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	32	33
Progress Energy | Nuclear deferral
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	42	35
Progress Energy | Costs of removal
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	107
Progress Energy | Qualifying facility contract buyouts
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	94	107
Progress Energy | ABSAT, coal ash basin closure
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	23	27
Progress Energy | Incremental COVID-19 expenses
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	28	23
Progress Energy | Deferred severance charges
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	18	29
Progress Energy | Other
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	87	158
Duke Energy Carolinas
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	3,479	3,469
Less: current portion	544	473
Total noncurrent regulatory assets	2,935	2,996
Total regulatory liabilities	7,685	7,008
Less: current portion	487	473
Total noncurrent regulatory liabilities	7,198	6,535
Duke Energy Carolinas | Net regulatory liability related to income taxes
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities	2,785	2,874
Duke Energy Carolinas | Costs of removal
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities	2,009	1,975
Duke Energy Carolinas | AROs – nuclear and other
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities	2,053	1,512
Duke Energy Carolinas | Provision for rate refunds
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities	124	170
Duke Energy Carolinas | Hedge cost deferrals
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities	154	16
Duke Energy Carolinas | Accrued pension and OPEB
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities	44	32
Duke Energy Carolinas | Other
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities	516	429
Duke Energy Carolinas | AROs – coal ash
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	1,227	1,414
Duke Energy Carolinas | Accrued pension and OPEB
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	365	427
Duke Energy Carolinas | Deferred fuel and purchased power
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	339	42
Duke Energy Carolinas | Storm cost securitized balance, net
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	232
Duke Energy Carolinas | Retired generation facilities
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	54	11
Duke Energy Carolinas | Post-in-service carrying costs (PISCC) and deferred operating expenses
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	31	32
Duke Energy Carolinas | Hedge cost deferrals
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	171	174
Duke Energy Carolinas | Deferred asset – Lee and Harris COLA
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	296	324
Duke Energy Carolinas | Advanced metering infrastructure (AMI)
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	140	154
Duke Energy Carolinas | Customer connect project
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	66	50
Duke Energy Carolinas | Vacation accrual
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	83	84
Duke Energy Carolinas | Storm cost deferrals
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	22	205
Duke Energy Carolinas | COR settlement
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	91	95
Duke Energy Carolinas | Nuclear deferral
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	78	88
Duke Energy Carolinas | ABSAT, coal ash basin closure
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	67	71
Duke Energy Carolinas | Incremental COVID-19 expenses
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	51	31
Duke Energy Carolinas | Deferred severance charges
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	36	57
Duke Energy Carolinas | Other
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	130	210
Duke Energy Progress
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	4,651	4,468
Less: current portion	533	492
Total noncurrent regulatory assets	4,118	3,976
Total regulatory liabilities	5,249	4,924
Less: current portion	381	530
Total noncurrent regulatory liabilities	4,868	4,394
Duke Energy Progress | Net regulatory liability related to income taxes
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities	1,695	1,662
Duke Energy Progress | Costs of removal
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities	2,955	2,666
Duke Energy Progress | Provision for rate refunds
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities	87	123
Duke Energy Progress | Hedge cost deferrals
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities	117	8
Duke Energy Progress | Other
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities	395	465
Duke Energy Progress | AROs – coal ash
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	1,389	1,347
Duke Energy Progress | AROs – nuclear and other
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	613	683
Duke Energy Progress | Accrued pension and OPEB
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	351	393
Duke Energy Progress | Deferred fuel and purchased power
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	303	158
Duke Energy Progress | Storm cost securitized balance, net
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	759
Duke Energy Progress | Retired generation facilities
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	171	189
Duke Energy Progress | Post-in-service carrying costs (PISCC) and deferred operating expenses
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	47	51
Duke Energy Progress | Hedge cost deferrals
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	60	89
Duke Energy Progress | Deferred asset – Lee and Harris COLA
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	21	32
Duke Energy Progress | Advanced metering infrastructure (AMI)
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	92	57
Duke Energy Progress | Customer connect project
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	57	25
Duke Energy Progress | Demand side management (DSM)/Energy efficiency (EE)
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	218	224
Duke Energy Progress | Vacation accrual
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	42	42
Duke Energy Progress | Storm cost deferrals
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	170	785
Duke Energy Progress | NCEMPA deferrals
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	165	124
Duke Energy Progress | COR settlement
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	32	33
Duke Energy Progress | Nuclear deferral
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	42	35
Duke Energy Progress | ABSAT, coal ash basin closure
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	23	27
Duke Energy Progress | Incremental COVID-19 expenses
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	28	23
Duke Energy Progress | Deferred severance charges
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	18	29
Duke Energy Progress | Other
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	50	122
Duke Energy Florida
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	2,288	2,064
Less: current portion	497	265
Total noncurrent regulatory assets	1,791	1,799
Total regulatory liabilities	796	768
Less: current portion	98	110
Total noncurrent regulatory liabilities	698	658
Duke Energy Florida | Net regulatory liability related to income taxes
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities	699	749
Duke Energy Florida | Other
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities	97	19
Duke Energy Florida | AROs – coal ash
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	10	10
Duke Energy Florida | AROs – nuclear and other
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	7	2
Duke Energy Florida | Accrued pension and OPEB
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	374	482
Duke Energy Florida | Deferred fuel and purchased power
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	415	4
Duke Energy Florida | Nuclear asset securitized balance, net
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	937	991
Duke Energy Florida | Retired generation facilities
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	94	174
Duke Energy Florida | Hedge cost deferrals
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	77	59
Duke Energy Florida | Advanced metering infrastructure (AMI)
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	38	45
Duke Energy Florida | Customer connect project
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	67	30
Duke Energy Florida | Demand side management (DSM)/Energy efficiency (EE)
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	12	17
Duke Energy Florida | Storm cost deferrals
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	19	108
Duke Energy Florida | Costs of removal
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	107
Duke Energy Florida | Qualifying facility contract buyouts
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	94	107
Duke Energy Florida | Other
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	37	35
Duke Energy Ohio
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	707	649
Less: current portion	72	39
Total noncurrent regulatory assets	635	610
Total regulatory liabilities	801	813
Less: current portion	62	65
Total noncurrent regulatory liabilities	739	748
Duke Energy Ohio | Net regulatory liability related to income taxes
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities	602	628
Duke Energy Ohio | Costs of removal
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities	39	68
Duke Energy Ohio | Provision for rate refunds
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities	61	45
Duke Energy Ohio | Accrued pension and OPEB
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities	21	17
Duke Energy Ohio | Other
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities	78	55
Duke Energy Ohio | AROs – coal ash
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	33	22
Duke Energy Ohio | Accrued pension and OPEB
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	133	149
Duke Energy Ohio | Deferred fuel and purchased power
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	38
Duke Energy Ohio | Post-in-service carrying costs (PISCC) and deferred operating expenses
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	16	16
Duke Energy Ohio | Hedge cost deferrals
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	5	7
Duke Energy Ohio | Advanced metering infrastructure (AMI)
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	24	36
Duke Energy Ohio | Customer connect project
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	41	26
Duke Energy Ohio | Demand side management (DSM)/Energy efficiency (EE)
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	5	1
Duke Energy Ohio | Vacation accrual
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	6	6
Duke Energy Ohio | Storm cost deferrals
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	2	4
Duke Energy Ohio | CEP deferral
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	161	117
Duke Energy Ohio | Deferred pipeline integrity costs
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	24	21
Duke Energy Ohio | Manufactured gas plant (MGP)
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	104	104
Duke Energy Ohio | Other
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	115	140
Duke Energy Indiana
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	1,555	1,328
Less: current portion	277	125
Total noncurrent regulatory assets	1,278	1,203
Total regulatory liabilities	1,692	1,738
Less: current portion	127	111
Total noncurrent regulatory liabilities	1,565	1,627
Duke Energy Indiana | Net regulatory liability related to income taxes
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities	908	956
Duke Energy Indiana | Costs of removal
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities	575	599
Duke Energy Indiana | Accrued pension and OPEB
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities	113	100
Duke Energy Indiana | Other
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities	96	83
Duke Energy Indiana | AROs – coal ash
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	749	615
Duke Energy Indiana | Accrued pension and OPEB
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	222	245
Duke Energy Indiana | Deferred fuel and purchased power
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	158	9
Duke Energy Indiana | Retired generation facilities
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	38	43
Duke Energy Indiana | Post-in-service carrying costs (PISCC) and deferred operating expenses
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	262	298
Duke Energy Indiana | Hedge cost deferrals
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	35	22
Duke Energy Indiana | Advanced metering infrastructure (AMI)
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	17	19
Duke Energy Indiana | Customer connect project
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	11	5
Duke Energy Indiana | Vacation accrual
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	13	12
Duke Energy Indiana | Other
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	50	60
Piedmont
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	457	455
Less: current portion	141	153
Total noncurrent regulatory assets	316	302
Total regulatory liabilities	1,114	1,132
Less: current portion	56	88
Total noncurrent regulatory liabilities	1,058	1,044
Piedmont | Net regulatory liability related to income taxes
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities	510	499
Piedmont | Costs of removal
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities	572	575
Piedmont | Provision for rate refunds
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities	2	6
Piedmont | Accrued pension and OPEB
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities	5	3
Piedmont | Other
Regulatory Assets Liabilities [Line Items]
Total regulatory liabilities	25	49
Piedmont | AROs – nuclear and other
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	22	20
Piedmont | Accrued pension and OPEB
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	82	88
Piedmont | Vacation accrual
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	12	12
Piedmont | Derivatives – natural gas supply contracts
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	139	122
Piedmont | Deferred pipeline integrity costs
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	84	71
Piedmont | Amounts due from customers
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	85	110
Piedmont | Other
Regulatory Assets Liabilities [Line Items]
Total regulatory assets	$ 33	$ 32

Regulatory Matters (Narrative)

Regulatory Matters (Narrative) (Details) - USD ($) $ in Millions	Jan. 22, 2021	Dec. 31, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Public Utilities, General Disclosures [Line Items]
Impairment of assets and other charges			$ 356	$ 984	$ (8)
Duke Energy Ohio
Public Utilities, General Disclosures [Line Items]
Limit of total capital			30.00%
Impairment of assets and other charges			$ 25
Duke Energy Kentucky
Public Utilities, General Disclosures [Line Items]
Required minimum equity capital structure			35.00%
Duke Energy Carolinas and Duke Energy Progress | CCR Settlement Agreement
Public Utilities, General Disclosures [Line Items]
Recovery costs not sought	$ 1,000
Recovery costs amortization period	5 years
Equity return on deferred coal ash cost future cases	1.50%
Duke Energy Carolinas and Duke Energy Progress | CCR Settlement Agreement | NCUC
Public Utilities, General Disclosures [Line Items]
Requested capital structure, percentage	48.00%
Requested debt structure, percentage	52.00%
Duke Energy Carolinas
Public Utilities, General Disclosures [Line Items]
Impairment of assets and other charges			$ 227	476	17
Duke Energy Carolinas | CCR Settlement Agreement
Public Utilities, General Disclosures [Line Items]
Impairment of assets and other charges		$ 454
Reversal of regulated electric operating revenues		50
Duke Energy Progress
Public Utilities, General Disclosures [Line Items]
Impairment of assets and other charges			$ 63	$ 499	$ 12
Duke Energy Progress | CCR Settlement Agreement
Public Utilities, General Disclosures [Line Items]
Impairment of assets and other charges		494
Reversal of regulated electric operating revenues		$ 102

Regulatory Matters (Duke Energy

Regulatory Matters (Duke Energy Carolinas Narrative) (Details) $ in Millions

Sep. 27, 2021contention

Jul. 28, 2021

Jun. 07, 2021

Jun. 06, 2021

May 21, 2021USD ($)

Mar. 31, 2021USD ($)

Sep. 30, 2019USD ($)

May 21, 2019USD ($)

Nov. 08, 2018USD ($)

Feb. 28, 2018

Aug. 25, 2017USD ($)

Dec. 31, 2021USD ($)

Dec. 31, 2020USD ($)

Dec. 31, 2019USD ($)

Public Utilities, General Disclosures [Line Items]

Regulatory assets

$ 14,637

$ 14,062

Impairment of assets and other charges

356

984

$ (8)

Other income and expenses, net

643

453

430

Storm cost deferrals

Public Utilities, General Disclosures [Line Items]

Regulatory assets

213

1,102

AROs – coal ash

Public Utilities, General Disclosures [Line Items]

Regulatory assets

$ 3,408

3,408

Nuclear Regulatory Commission

Public Utilities, General Disclosures [Line Items]

Operating license extension

20 years

Duke Energy Carolinas

Public Utilities, General Disclosures [Line Items]

Regulatory assets

$ 3,479

3,469

Impairment of assets and other charges

227

476

17

Other income and expenses, net

270

177

$ 151

Duke Energy Carolinas | Storm cost deferrals

Public Utilities, General Disclosures [Line Items]

Regulatory assets

22

205

Duke Energy Carolinas | AROs – coal ash

Public Utilities, General Disclosures [Line Items]

Regulatory assets

1,227

$ 1,414

Duke Energy Carolinas | NCUC | 2017 North Carolina Rate Case

Public Utilities, General Disclosures [Line Items]

Requested rate increase (decrease)

$ 647

Requested return on equity, percentage

9.90%

Requested capital structure, percentage

52.00%

Requested debt structure, percentage

48.00%

Duke Energy Carolinas | NCUC | 2019 North Carolina Rate Case

Public Utilities, General Disclosures [Line Items]

Requested rate increase (decrease)

$ 291

Requested rate increase (decrease), percent

6.00%

Requested gross rate case revenue increase

$ 445

Requested EDIT rider decrease

$ 154

Duke Energy Carolinas | North Carolina Utilities Commission | 2019 North Carolina Rate Case, Additional Agreement and Stipulation of Partial Settlement

Public Utilities, General Disclosures [Line Items]

Approved return on equity, percentage

9.60%

Approved capital structure, percentage

52.00%

Approved debt structure, percentage

48.00%

Approved rate increase (decrease) amount by state commission

$ 33

Duke Energy Carolinas | North Carolina Utilities Commission | 2019 North Carolina Rate Case, Additional Agreement and Stipulation of Partial Settlement | Grid Improvement

Public Utilities, General Disclosures [Line Items]

Regulatory assets

$ 800

Duke Energy Carolinas | North Carolina Utilities Commission | 2019 North Carolina Rate Case, Additional Agreement and Stipulation of Partial Settlement | Storm cost deferrals

Public Utilities, General Disclosures [Line Items]

Regulatory assets

$ 213

Duke Energy Carolinas | PSCSC | 2018 South Carolina Rate Case

Public Utilities, General Disclosures [Line Items]

Requested rate increase (decrease)

$ 168

Approved return on equity, percentage

9.50%

Approved capital structure, percentage

53.00%

Approved debt structure, percentage

47.00%

Tax benefit from change in enacted tax rates

$ (66)

Measurement period adjustment

(45)

Duke Energy Carolinas | PSCSC | 2018 South Carolina Rate Case | Deferred project costs

Public Utilities, General Disclosures [Line Items]

Regulatory assets

$ 125

Recovery period

12 years

Duke Energy Carolinas | PSCSC | 2018 South Carolina Rate Case | AROs – coal ash

Public Utilities, General Disclosures [Line Items]

Regulatory assets

$ 96

Recovery period

5 years

Denied recovery costs

$ 115

Impairment of assets and other charges

160

Other income and expenses, net

$ 31

Duke Energy Carolinas | PSCSC | 2018 South Carolina Rate Case | Asset retirement obligations - unprotected EDIT, Property, Plant and Equipment

Public Utilities, General Disclosures [Line Items]

Recovery period

20 years

Duke Energy Carolinas | PSCSC | 2018 South Carolina Rate Case | Asset retirement obligations - Unprotected EDIT

Public Utilities, General Disclosures [Line Items]

Recovery period

5 years

Duke Energy Carolinas | PSCSC | 2018 South Carolina Rate Case | Asset retirement obligations - deferred revenue

Public Utilities, General Disclosures [Line Items]

Recovery period

5 years

Duke Energy Carolinas | PSCSC | 2018 South Carolina Rate Case | State | North Carolina DOR

Public Utilities, General Disclosures [Line Items]

Recovery period

5 years

Approved decrease through EDIT Rider

$ 17

Duke Energy Carolinas | Nuclear Regulatory Commission | Oconee Nuclear Station Subsequent License Renewal

Public Utilities, General Disclosures [Line Items]

Comment period

60 days

Number of contentions | contention

3

Duke Energy Carolinas | Nuclear Regulatory Commission | Oconee Nuclear Station Subsequent License Renewal | Oconee

Public Utilities, General Disclosures [Line Items]

Operating license extension

20 years

Operating license

80 years

60 years

Regulatory Matters (Duke Ener_2

Regulatory Matters (Duke Energy Progress Narrative) (Details) - USD ($) $ in Millions

May 21, 2021

Apr. 16, 2021

Oct. 16, 2020

Oct. 30, 2019

Oct. 11, 2019

May 21, 2019

Nov. 08, 2018

Nov. 22, 2017

Jun. 01, 2017

Dec. 31, 2021

Dec. 31, 2020

Dec. 31, 2019

Public Utilities, General Disclosures [Line Items]

Regulatory assets

$ 14,637

$ 14,062

Impairment of assets and other charges

356

984

$ (8)

Other income and expenses, net

643

453

430

Duke Energy Progress

Public Utilities, General Disclosures [Line Items]

Regulatory assets

4,651

4,468

Impairment of assets and other charges

63

499

12

Other income and expenses, net

143

75

$ 100

2017 North Carolina Rate Case | NCUC | Duke Energy Progress

Public Utilities, General Disclosures [Line Items]

Requested rate increase (decrease)

$ 477

Requested rate increase (decrease), amended, amount

$ 420

Requested return on equity, percentage

9.90%

Requested capital structure, percentage

52.00%

Requested debt structure, percentage

48.00%

2019 North Carolina Rate Case | NCUC | Duke Energy Progress

Public Utilities, General Disclosures [Line Items]

Requested rate increase (decrease)

$ 464

Requested rate increase (decrease), percent

12.30%

Requested gross rate case revenue increase

$ 586

Requested rate increase (decrease), rider reduction, tax cuts and jobs act and return deferred revenue

122

Requested EDIT rider decrease

$ 120

2019 North Carolina Rate Case | North Carolina Utilities Commission | Duke Energy Progress

Public Utilities, General Disclosures [Line Items]

Approved rate increase (decrease) amount by state commission

$ 178

2019 North Carolina Rate Case, Additional Agreement and Stipulation of Partial Settlement | North Carolina Utilities Commission | Duke Energy Progress

Public Utilities, General Disclosures [Line Items]

Approved return on equity, percentage

9.60%

Approved capital structure, percentage

52.00%

Approved debt structure, percentage

48.00%

2018 South Carolina Rate Case | PSCSC | Duke Energy Progress

Public Utilities, General Disclosures [Line Items]

Requested rate increase (decrease)

$ 59

Approved return on equity, percentage

9.50%

Approved capital structure, percentage

53.00%

Approved debt structure, percentage

47.00%

Tax benefit from change in enacted tax rates

$ (17)

Measurement period adjustment

(12)

FERC Return on Equity Complaint, North Carolina Eastern Municipal Power Agency | FERC | Duke Energy Progress

Public Utilities, General Disclosures [Line Items]

Approved return on equity, percentage

11.00%

FERC Return on Equity Complaint, North Carolina Electric Membership Corporation | FERC | Duke Energy Progress

Public Utilities, General Disclosures [Line Items]

Approved return on equity, percentage

11.00%

Grid Improvement | 2019 North Carolina Rate Case, Additional Agreement and Stipulation of Partial Settlement | North Carolina Utilities Commission | Duke Energy Progress

Public Utilities, General Disclosures [Line Items]

Regulatory assets

$ 400

Storm cost deferrals

Public Utilities, General Disclosures [Line Items]

Regulatory assets

213

1,102

Storm cost deferrals | Duke Energy Progress

Public Utilities, General Disclosures [Line Items]

Regulatory assets

170

785

Storm cost deferrals | 2019 North Carolina Rate Case, Additional Agreement and Stipulation of Partial Settlement | North Carolina Utilities Commission | Duke Energy Progress

Public Utilities, General Disclosures [Line Items]

Regulatory assets

$ 714

AROs – coal ash

Public Utilities, General Disclosures [Line Items]

Regulatory assets

3,408

3,408

AROs – coal ash | Duke Energy Progress

Public Utilities, General Disclosures [Line Items]

Regulatory assets

1,389

$ 1,347

AROs – coal ash | 2018 South Carolina Rate Case | PSCSC | Duke Energy Progress

Public Utilities, General Disclosures [Line Items]

Regulatory assets

4

Denied recovery costs

$ 65

Impairment of assets and other charges

42

Other income and expenses, net

$ 6

Asset retirement obligations - unprotected EDIT, Property, Plant and Equipment | 2018 South Carolina Rate Case | PSCSC | Duke Energy Progress

Public Utilities, General Disclosures [Line Items]

Recovery period

20 years

Asset retirement obligations - Unprotected EDIT | 2018 South Carolina Rate Case | PSCSC | Duke Energy Progress

Public Utilities, General Disclosures [Line Items]

Recovery period

5 years

Asset retirement obligations - deferred revenue | 2018 South Carolina Rate Case | PSCSC | Duke Energy Progress

Public Utilities, General Disclosures [Line Items]

Recovery period

3 years

State | North Carolina DOR | 2018 South Carolina Rate Case | PSCSC | Duke Energy Progress

Public Utilities, General Disclosures [Line Items]

Approved increase (decrease) through EDIT Rider

$ 12

Regulatory Matters (Duke Ener_3

Regulatory Matters (Duke Energy Florida Narrative) (Details)

Jan. 14, 2021USD ($)

Jul. 01, 2020USD ($)plantMW

Dec. 31, 2024USD ($)

Dec. 31, 2023USD ($)

Dec. 31, 2022USD ($)

Dec. 31, 2021USD ($)

Dec. 31, 2020USD ($)

Sep. 30, 2020USD ($)

May 19, 2020USD ($)

Dec. 19, 2019USD ($)

Nov. 22, 2019USD ($)

Apr. 30, 2019USD ($)

Public Utilities, General Disclosures [Line Items]

Regulatory assets

$ 14,637,000,000

$ 14,062,000,000

Duke Energy Florida

Public Utilities, General Disclosures [Line Items]

Regulatory assets

2,288,000,000

2,064,000,000

Hurricane Dorian Storm Damage | Duke Energy Florida

Public Utilities, General Disclosures [Line Items]

Estimated storm costs, capital and operation maintenance

$ 169,000,000

FPSC | Duke Energy Florida

Public Utilities, General Disclosures [Line Items]

Number of solar plants petition for approval | plant

10

Solar generation capacity plants (in MW) | MW

750

FPSC | 2021 Settlement | Duke Energy Florida

Public Utilities, General Disclosures [Line Items]

Approved capital structure, percentage

53.00%

Approved debt structure, percentage

47.00%

Public utilities, basis points, increase

0.25%

Contract asset, noncurrent

$ 173,000,000

Future investments in new cost

$ 1,000,000,000

FPSC | 2021 Settlement | Duke Energy Florida | Subsequent Event

Public Utilities, General Disclosures [Line Items]

Approved rate increase (decrease) amount by state commission

$ 79,000,000

$ 49,000,000

$ 67,000,000

FPSC | 2021 Settlement | Duke Energy Florida | US Treasury Securities

Public Utilities, General Disclosures [Line Items]

Public utilities, basis points, increase

0.50%

FPSC | 2021 Settlement | Duke Energy Florida | Minimum

Public Utilities, General Disclosures [Line Items]

Approved return on equity, percentage

8.85%

FPSC | 2021 Settlement | Duke Energy Florida | Minimum | US Treasury Securities

Public Utilities, General Disclosures [Line Items]

Approved return on equity, percentage

9.85%

FPSC | 2021 Settlement | Duke Energy Florida | Maximum

Public Utilities, General Disclosures [Line Items]

Approved return on equity, percentage

10.85%

FPSC | 2021 Settlement | Duke Energy Florida | Maximum | US Treasury Securities

Public Utilities, General Disclosures [Line Items]

Approved return on equity, percentage

10.10%

FPSC | 2021 Settlement | Duke Energy Florida | Weighted Average

Public Utilities, General Disclosures [Line Items]

Approved return on equity, percentage

9.85%

FPSC | Hurricane Michael Storm Damage | Duke Energy Florida

Public Utilities, General Disclosures [Line Items]

Estimated storm costs, capital and operation maintenance

$ 223,000,000

Amount of recovery costs sought

$ 188,000,000

$ 191,000,000

Storm deferral - requested supplemental true-up

$ 3,000,000

FPSC | Hurricane Dorian Storm Damage | Duke Energy Florida

Public Utilities, General Disclosures [Line Items]

Storm Costs - Capital and Operation Maintenance

$ 145,000,000

Solar Plant | Duke Energy Florida

Public Utilities, General Disclosures [Line Items]

Estimated cost of generation facilities to be built

$ 1,000,000,000

Estimated cost of generation facilities to be built, period

3 years

Storm cost deferrals

Public Utilities, General Disclosures [Line Items]

Regulatory assets

213,000,000

1,102,000,000

Storm cost deferrals | Duke Energy Florida

Public Utilities, General Disclosures [Line Items]

Regulatory assets

$ 19,000,000

108,000,000

Storm cost deferrals | Hurricane Michael Storm Damage | Duke Energy Florida

Public Utilities, General Disclosures [Line Items]

Regulatory assets

$ 80,000,000

Regulatory Matters (Duke Ener_4

Regulatory Matters (Duke Energy Ohio Narrative) (Details) $ in Millions

Dec. 28, 2021USD ($)

Oct. 08, 2021USD ($)

Oct. 01, 2021USD ($)

Jun. 01, 2021USD ($)

Dec. 31, 2021USD ($)

Dec. 31, 2021USD ($)site

Dec. 31, 2020USD ($)

Dec. 31, 2019USD ($)

Jul. 23, 2020USD ($)

Jan. 01, 2020plant

Nov. 21, 2019condition

Jul. 12, 2019USD ($)

Dec. 31, 2018USD ($)

Sep. 28, 2018USD ($)

Public Utilities, General Disclosures [Line Items]

Regulatory assets

$ 14,637

$ 14,637

$ 14,062

Impairment of assets and other charges

356

984

$ (8)

Public utilities, property, plant and equipment, net

111,408

111,408

106,782

Duke Energy Ohio

Public Utilities, General Disclosures [Line Items]

Number of nuclear generating facilities eligible for funding | plant

2

Regulatory assets

707

707

649

Impairment of assets and other charges

25

Public utilities, property, plant and equipment, net

8,625

$ 8,625

8,009

Duke Energy Ohio Electric Base Rate Case | Public Utilities Commission Of Ohio | Duke Energy Ohio

Public Utilities, General Disclosures [Line Items]

Requested rate increase (decrease)

$ 55

Requested return on equity, percentage

10.30%

Requested rate increase (decrease), percent

3.30%

MGP Cost Recovery - 2009 Through 2012 | Public Utilities Commission Of Ohio | Duke Energy Ohio

Public Utilities, General Disclosures [Line Items]

Number of environmental remediation sites | site

2

Regulatory assets

55

$ 55

MGP Cost Recovery - 2013 Through 2017 | Public Utilities Commission Of Ohio | Duke Energy Ohio

Public Utilities, General Disclosures [Line Items]

Regulatory assets

$ 26

MGP Cost Recovery - 2018 | Public Utilities Commission Of Ohio | Duke Energy Ohio

Public Utilities, General Disclosures [Line Items]

Regulatory assets

$ 20

MGP Cost Recovery - 2019 | Public Utilities Commission Of Ohio | Duke Energy Ohio

Public Utilities, General Disclosures [Line Items]

Regulatory assets

$ 39

Duke Energy Kentucky Gas Base Rate Case | KPSC | Duke Energy Kentucky

Public Utilities, General Disclosures [Line Items]

Requested rate increase (decrease)

$ 9

$ 15

Requested rate increase (decrease), percent

13.00%

Annual rate increase cap, percentage

5.00%

Base rate case-stay out period

4 years

Approved rate increase (decrease) amount by state commission

$ 9

Duke Energy Kentucky Gas Base Rate Case | KPSC | Duke Energy Kentucky | Public Utilities, Natural Gas Base Rates

Public Utilities, General Disclosures [Line Items]

Requested rate increase (decrease), percent

9.375%

Duke Energy Kentucky Gas Base Rate Case | KPSC | Duke Energy Kentucky | Public Utilities, Natural Gas Riders

Public Utilities, General Disclosures [Line Items]

Requested rate increase (decrease), percent

9.30%

Midwest Propane Caverns | Duke Energy Ohio

Public Utilities, General Disclosures [Line Items]

Impairment of assets and other charges

19

Public utilities, property, plant and equipment, net

6

6

$ 27

Minimum | Natural Gas Pipeline Extension | Ohio Power Siting Board | Duke Energy Ohio

Public Utilities, General Disclosures [Line Items]

Estimated capital cost excluding AFUDC

185

185

Number of conditions on construction | condition

41

Maximum | Natural Gas Pipeline Extension | Ohio Power Siting Board | Duke Energy Ohio

Public Utilities, General Disclosures [Line Items]

Estimated capital cost excluding AFUDC

$ 195

$ 195

MGP Costs - Regulatory Disallowance | MGP Cost Recovery - 2013 Through 2017 | Public Utilities Commission Of Ohio | Duke Energy Ohio

Public Utilities, General Disclosures [Line Items]

Regulatory assets

$ 12

MGP Costs - Regulatory Disallowance | MGP Cost Recovery - 2018 | Public Utilities Commission Of Ohio | Duke Energy Ohio

Public Utilities, General Disclosures [Line Items]

Regulatory assets

$ 11

MGP Costs - Regulatory Disallowance | MGP Cost Recovery - 2019 | Public Utilities Commission Of Ohio | Duke Energy Ohio

Public Utilities, General Disclosures [Line Items]

Regulatory assets

$ 4

Regulatory Matters (Duke Ener_5

Regulatory Matters (Duke Energy Ohio - Exit Obligation Rollforward) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Restructuring Reserve [Roll Forward]
Balance, beginning of period	$ 11
Cash reductions	(8)
Balance, end of period	39
Regulatory assets	14,637	$ 14,062
Duke Energy Ohio
Restructuring Reserve [Roll Forward]
Regulatory assets	707	649
RTO Realignment | Duke Energy Ohio
Restructuring Reserve [Roll Forward]
Balance, beginning of period	50
Cash reductions	(4)
Balance, end of period	46
Regulatory assets	$ 33	$ 37

Regulatory Matters (Duke Ener_6

Regulatory Matters (Duke Energy Indiana Narrative) (Details) - Duke Energy Indiana - Indiana Rate Case 2019 - Indiana Utility Regulatory Commission - USD ($) $ in Millions	Jul. 28, 2021	Jun. 29, 2020	Dec. 04, 2019	Jul. 02, 2019	Dec. 31, 2020
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease)				$ 395
Requested rate increase (decrease), percentage, net of tax			15.60%
Requested rate increase (decrease), amended, amount			$ 396
Approved rate increase (decrease) amount by state commission		$ 146
Disclosure of rate matters, rate base					$ 10,200
Public utilities, disclosure of rate matters, reduction of rate base		$ 200
Public utilities, disclosure of rate matters, rate base reduction due to depreciation methodology, percent		50.00%
Public utilities, disclosure of rate matters, rate base reduction due to approved return on equity, percent		20.00%
Approved return on equity, percentage	9.70%	9.70%
Requested return on equity, percentage		10.40%
Public utilities, disclosure of rate matters, rate base reduction due to earnings adjustments, percent		20.00%
Public utilities, approved return on equity, step one estimated percentage		75.00%
Public utilities, approved return on equity, step two estimated percentage		25.00%
Approved capital structure, percentage	54.00%

Regulatory Matters (Piedmont Na

Regulatory Matters (Piedmont Narrative) (Details) - Piedmont - USD ($) $ in Millions	Sep. 07, 2021	Jul. 28, 2021	May 06, 2021	Mar. 22, 2021	Jul. 02, 2020	Dec. 31, 2020
2020 Tennessee Rate Case | TPUC
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease)					$ 30	$ 26
Increase in annual revenue, percent					15.00%
Approved rate increase (decrease) amount by state commission			$ 16
Approved return on equity, percentage			9.80%
2021 North Carolina Rate Case | North Carolina Utilities Commission
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease)	$ 67			$ 109
Increase in annual revenue, percent				10.00%
Plants rolled into base rate				70.00%
Requested rate increase (decrease), amended, amount		$ 97
Requested return on equity, percentage	9.60%
Requested capital structure, percentage	51.60%
Requested debt structure, percentage	48.40%

Regulatory Matters (Other Regul

Regulatory Matters (Other Regulatory Matters Narrative) (Details) - USD ($) $ in Millions	1 Months Ended	12 Months Ended
	Jun. 30, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Feb. 28, 2021
Public Utilities, General Disclosures [Line Items]
Equity in losses of unconsolidated affiliates		$ (28)	$ 2,005	$ (162)
Other current liabilities		2,471	2,936
Asset retirement obligations		$ 647	$ 718
Atlantic Coast Pipeline (ACP)
Public Utilities, General Disclosures [Line Items]
Joint owner ownership percentage		47.00%
Atlantic Coast Pipeline (ACP) | Atlantic Coast Pipeline (ACP)
Public Utilities, General Disclosures [Line Items]
Equity in losses of unconsolidated affiliates	$ 2,100
Other current liabilities		$ 47
Other liabilities, noncurrent		53
Atlantic Coast Pipeline (ACP) | Atlantic Coast Pipeline (ACP) | Current Liabilities
Public Utilities, General Disclosures [Line Items]
Guarantor obligations settled					$ 855
Asset retirement obligations		$ 100

Regulatory Matters (Schedule _2

Regulatory Matters (Schedule of Net Carrying Value Of Facilities) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2034asset	Dec. 31, 2021USD ($)MW	Dec. 31, 2020USD ($)MW
Public Utilities, General Disclosures [Line Items]
Remaining net book value		$ 111,408	$ 106,782
Generating facilities planned for retirement
Public Utilities, General Disclosures [Line Items]
Capacity (in MW) | MW		8,386
Remaining net book value		$ 5,917
Duke Energy Carolinas
Public Utilities, General Disclosures [Line Items]
Remaining net book value		$ 34,122	$ 33,187
Duke Energy Carolinas | Allen Steam Station Unit 1 | Generating facilities planned for retirement
Public Utilities, General Disclosures [Line Items]
Capacity (in MW) | MW		167
Remaining net book value		$ 12
Duke Energy Carolinas | Allen Steam Station Unit 5 | Generating facilities planned for retirement
Public Utilities, General Disclosures [Line Items]
Capacity (in MW) | MW		259
Remaining net book value		$ 277
Duke Energy Carolinas | Cliffside Unit 5 | Generating facilities planned for retirement
Public Utilities, General Disclosures [Line Items]
Capacity (in MW) | MW		546
Remaining net book value		$ 365
Duke Energy Carolinas | Allen Steam Station 3 | Generating facilities planned for retirement
Public Utilities, General Disclosures [Line Items]
Capacity (in MW) | MW			270
Remaining net book value			$ 26
Duke Energy Carolinas | Allen Steam Station 2 | Generating facilities planned for retirement
Public Utilities, General Disclosures [Line Items]
Capacity (in MW) | MW			167
Remaining net book value			$ 44
Duke Energy Carolinas | Roxboro Unit 4 | Generating facilities planned for retirement
Public Utilities, General Disclosures [Line Items]
Capacity (in MW) | MW			267
Remaining net book value			$ 170
Duke Energy Progress
Public Utilities, General Disclosures [Line Items]
Remaining net book value		$ 23,657	22,987
Duke Energy Progress | Mayo Unit 1 | Generating facilities planned for retirement
Public Utilities, General Disclosures [Line Items]
Capacity (in MW) | MW		713
Remaining net book value		$ 631
Duke Energy Progress | Roxboro Units 3-4 | Generating facilities planned for retirement
Public Utilities, General Disclosures [Line Items]
Capacity (in MW) | MW		1,409
Remaining net book value		$ 457
Duke Energy Florida
Public Utilities, General Disclosures [Line Items]
Remaining net book value		$ 18,046	16,563
Duke Energy Florida | Crystal River Units 4 and 5 | Generating facilities planned for retirement
Public Utilities, General Disclosures [Line Items]
Capacity (in MW) | MW		1,442
Remaining net book value		$ 1,650
Duke Energy Florida | Crystal River Units 4 and 5 | Generating facilities planned for retirement | Forecast
Public Utilities, General Disclosures [Line Items]
Facilities retiring ahead of schedule | asset	2
Facilities retiring ahead of schedule, years ahead	8 years
Duke Energy Indiana
Public Utilities, General Disclosures [Line Items]
Remaining net book value		$ 11,760	$ 11,721
Duke Energy Indiana | Gibson Units 1 - 5 | Generating facilities planned for retirement
Public Utilities, General Disclosures [Line Items]
Capacity (in MW) | MW		2,845
Remaining net book value		$ 1,829
Duke Energy Indiana | Cayuga Units 1 - 2 | Generating facilities planned for retirement
Public Utilities, General Disclosures [Line Items]
Capacity (in MW) | MW		1,005
Remaining net book value		$ 696
Duke Energy Indiana | Gallagher Units 2 and 4 | Generating facilities planned for retirement
Public Utilities, General Disclosures [Line Items]
Capacity (in MW) | MW			280
Remaining net book value			$ 102

Commitments and Contingencies_2

Commitments and Contingencies (Narrative) (Details) $ in Millions	Jun. 16, 2021people	Dec. 31, 2021USD ($)reactorplant	Dec. 31, 2021USD ($)reactorplant	Feb. 09, 2022USD ($)	Dec. 31, 2020USD ($)	Jun. 18, 2018USD ($)
Loss Contingencies [Line Items]
Number of licensed nuclear reactors | reactor		95	95
Insured public liability limit per nuclear incident		$ 13,500	$ 13,500
Excess nuclear liability program coverage		13,100	13,100
Pro rata assessment for each reactor owned for each incident exceeding public liability insurance		138	138
Annual payment limit to pro rata assessments		20.5	20.5
Industry aggregate limit		3,200	3,200
Sublimit for non-nuclear terrorist events		1,800	1,800
Sublimit property damage losses		1,500	1,500
Additional nuclear accident limit		$ 1,250	$ 1,250
Insurance coverage percentage initial weeks		100.00%	100.00%
Accidental outage insurance coverage initial weeks		365 days
Insurance coverage percentage additional weeks		80.00%	80.00%
Accidental outage insurance coverage additional weeks		770 days
Weeks of sublimits for accidental outage coverage		728 days
Sublimit accidental outage recovery		$ 328	$ 328
Maximum magnitude of retroactive premiums		10	10
Maximum period for retroactive premium assessment		6 years
Coal Ash Insurance Coverage Litigation
Loss Contingencies [Line Items]
Number of NC and SC plants with ash basins | plant		15	15
Duke Energy Carolinas
Loss Contingencies [Line Items]
Primary nuclear liability program coverage		$ 450	$ 450
Max retroactive premium assessments		$ 140
Duke Energy Carolinas | Catawba
Loss Contingencies [Line Items]
Number of licensed nuclear reactors | reactor		2	2
Dedicated additional nuclear accident limit		$ 1,250	$ 1,250
Additional Non-nuclear accident limit		750	750
Accidental outage insurance coverage policy limit		$ 490	$ 490
Potential obligation percentage		100.00%	100.00%
Duke Energy Carolinas | McGuire
Loss Contingencies [Line Items]
Number of licensed nuclear reactors | reactor		2	2
Accidental outage insurance coverage policy limit		$ 434	$ 434
Duke Energy Carolinas | Oconee
Loss Contingencies [Line Items]
Number of licensed nuclear reactors | reactor		3	3
Additional Non-nuclear accident limit		$ 750	$ 750
Accidental outage insurance coverage policy limit		322	322
Duke Energy Carolinas | Ruben Villano, et al. v. Duke Energy Carolinas, LLC | Pending Litigation
Loss Contingencies [Line Items]
Number of individuals | people	9
Number of survivors | people	4
Number of deceased individuals | people	5
Duke Energy Carolinas | Asbestos Issue
Loss Contingencies [Line Items]
Asbestos-related injuries and damages reserves		501	501		$ 572
Loss contingency, receivable, noncurrent		644	644		704
Duke Energy Progress
Loss Contingencies [Line Items]
Primary nuclear liability program coverage		450	$ 450
Max retroactive premium assessments		$ 88
Duke Energy Progress | Harris
Loss Contingencies [Line Items]
Number of licensed nuclear reactors | reactor		1	1
Accidental outage insurance coverage policy limit		$ 364	$ 364
Duke Energy Progress | Robinson
Loss Contingencies [Line Items]
Number of licensed nuclear reactors | reactor		1	1
Accidental outage insurance coverage policy limit		$ 280	$ 280
Duke Energy Progress | Brunswick
Loss Contingencies [Line Items]
Number of licensed nuclear reactors | reactor		2	2
Accidental outage insurance coverage policy limit		$ 336	$ 336
Duke Energy Progress | Spent Nuclear Fuel Matters
Loss Contingencies [Line Items]
Damages sought						$ 100
Duke Energy Florida
Loss Contingencies [Line Items]
Primary nuclear liability program coverage		100	100
Max retroactive premium assessments		1
Duke Energy Florida | Crystal River Unit 3
Loss Contingencies [Line Items]
Sublimit property damage losses		50	50
Duke Energy Florida | Spent Nuclear Fuel Matters
Loss Contingencies [Line Items]
Damages sought						$ 200
Duke Energy Florida | Spent Nuclear Fuel Matters | Subsequent Event
Loss Contingencies [Line Items]
Damages sought				$ 60
Duke Energy Carolinas and Duke Energy Progress | Coal Ash Insurance Coverage Litigation
Loss Contingencies [Line Items]
Proceeds from legal settlements			418
Duke Energy and Duke Energy Carolinas | ASU 2016-13
Loss Contingencies [Line Items]
Premium receivable, allowance for credit loss		$ 12	$ 12		$ 15

Commitments and Contingencies_3

Commitments and Contingencies (Schedule of Environmental Loss Contingencies) (Details) - Environmental reserves - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Loss Contingencies [Line Items]
Reserves for Environmental Remediation	$ 88	$ 75
Duke Energy Carolinas
Loss Contingencies [Line Items]
Reserves for Environmental Remediation	19	19
Progress Energy
Loss Contingencies [Line Items]
Reserves for Environmental Remediation	23	19
Duke Energy Progress
Loss Contingencies [Line Items]
Reserves for Environmental Remediation	11	6
Duke Energy Florida
Loss Contingencies [Line Items]
Reserves for Environmental Remediation	11	12
Duke Energy Ohio
Loss Contingencies [Line Items]
Reserves for Environmental Remediation	34	22
Duke Energy Indiana
Loss Contingencies [Line Items]
Reserves for Environmental Remediation	4	6
Piedmont
Loss Contingencies [Line Items]
Reserves for Environmental Remediation	$ 9	$ 10

Commitments and Contingencies_4

Commitments and Contingencies (Purchased Power) (Details) - Purchased Power Contracts $ in Millions	12 Months Ended
	Dec. 31, 2021USD ($)
Duke Energy Progress
Unconditional Purchase Obligations [Abstract]
2022	$ 22
2023	22
2024	21
2025	22
2026	18
Thereafter	45
Total	$ 150
Duke Energy Progress | Minimum
Unconditional Purchase Obligations [Abstract]
Net plant output percent	18.00%
Duke Energy Progress | Maximum
Unconditional Purchase Obligations [Abstract]
Net plant output percent	100.00%
Duke Energy Florida
Unconditional Purchase Obligations [Abstract]
2022	$ 354
2023	374
2024	262
2025	91
Total	$ 1,081
Net plant output percent	100.00%
Duke Energy Ohio
Unconditional Purchase Obligations [Abstract]
2022	$ 53
2023	34
Total	$ 87
Net plant output percent	15.00%

Commitments and Contingencies_5

Commitments and Contingencies (Gas Supply Contracts) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2021USD ($)
Maximum | Pipeline and storage capacity contracts
Long-term Purchase Commitment [Line Items]
Long-term purchase commitment term	14 years
Maximum | Natural gas supply contracts fixed payment
Long-term Purchase Commitment [Line Items]
Long-term purchase commitment term	5 years
Maximum | Natural gas supply purchase commitments
Long-term Purchase Commitment [Line Items]
Long-term purchase commitment term	10 years
Duke Energy Ohio | Natural Gas Supply and Capacity Contracts
Long-term Purchase Commitment [Line Items]
2022	$ 62
2023	37
2024	25
2025	16
2026	13
Thereafter	47
Total	200
Piedmont | Natural Gas Supply and Capacity Contracts
Long-term Purchase Commitment [Line Items]
2022	324
2023	272
2024	225
2025	134
2026	122
Thereafter	503
Total	$ 1,580

Leases (Narrative) (Details)

Leases (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Lessee, Lease, Description [Line Items]
Operating lease assets, cost basis	$ 161,819	$ 155,580
Piedmont
Lessee, Lease, Description [Line Items]
Operating lease assets, cost basis	9,918	9,134
Construction and transportation of natural gas pipelines | Piedmont
Lessee, Lease, Description [Line Items]
Net investment in lease, current	2	2
Renewable energy projects
Lessee, Lease, Description [Line Items]
Contingent lease payments	259	275	$ 264
Operating lease assets, cost basis	3,339	3,335
Operating lease assets, accumulated depreciation	966	848
Duke Energy Carolinas | Construction and transportation of natural gas pipelines | Piedmont
Lessee, Lease, Description [Line Items]
Net investment in lease, noncurrent	$ 203	$ 205

Leases (Lease Costs) (Details)

Leases (Lease Costs) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Lessee, Lease, Description [Line Items]
Operating lease expense	$ 250	$ 283
Short-term lease expense	5	4
Variable lease expense	41	30
Finance lease expense
Amortization of leased assets	219	119
Interest on lease liabilities	55	61
Total finance lease expense	274	180
Total lease expense	570	497
Duke Energy Carolinas
Lessee, Lease, Description [Line Items]
Operating lease expense	43	53
Variable lease expense	17	13
Finance lease expense
Amortization of leased assets	5	8
Interest on lease liabilities	33	30
Total finance lease expense	38	38
Total lease expense	98	104
Progress Energy
Lessee, Lease, Description [Line Items]
Operating lease expense	155	162
Short-term lease expense	2	2
Variable lease expense	22	13
Finance lease expense
Amortization of leased assets	37	24
Interest on lease liabilities	48	44
Total finance lease expense	85	68
Total lease expense	264	245
Duke Energy Progress
Lessee, Lease, Description [Line Items]
Operating lease expense	83	72
Short-term lease expense	1	1
Variable lease expense	10	5
Finance lease expense
Amortization of leased assets	18	6
Interest on lease liabilities	42	37
Total finance lease expense	60	43
Total lease expense	154	121
Duke Energy Florida
Lessee, Lease, Description [Line Items]
Operating lease expense	72	90
Short-term lease expense	1	1
Variable lease expense	12	8
Finance lease expense
Amortization of leased assets	19	18
Interest on lease liabilities	6	7
Total finance lease expense	25	25
Total lease expense	110	124
Duke Energy Ohio
Lessee, Lease, Description [Line Items]
Operating lease expense	11	11
Finance lease expense
Total lease expense	11	11
Duke Energy Indiana
Lessee, Lease, Description [Line Items]
Operating lease expense	18	19
Short-term lease expense	2	1
Variable lease expense		1
Finance lease expense
Amortization of leased assets	1	1
Total finance lease expense	1	1
Total lease expense	21	22
Piedmont
Lessee, Lease, Description [Line Items]
Operating lease expense	7	7
Variable lease expense	1	1
Finance lease expense
Total lease expense	$ 8	$ 8

Leases (Operating Lease Maturit

Leases (Operating Lease Maturities) (Details) $ in Millions	Dec. 31, 2021USD ($)
Lessee, Operating Lease, Liability, Payment, Due
2022	$ 225
2023	212
2024	185
2025	156
2026	136
Thereafter	594
Total operating lease payments	1,508
Less: present value discount	(247)
Total operating lease liabilities	1,261
Duke Energy Carolinas
Lessee, Operating Lease, Liability, Payment, Due
2022	24
2023	21
2024	14
2025	10
2026	10
Thereafter	42
Total operating lease payments	121
Less: present value discount	(21)
Total operating lease liabilities	100
Progress Energy
Lessee, Operating Lease, Liability, Payment, Due
2022	118
2023	118
2024	110
2025	96
2026	92
Thereafter	290
Total operating lease payments	824
Less: present value discount	(124)
Total operating lease liabilities	700
Duke Energy Progress
Lessee, Operating Lease, Liability, Payment, Due
2022	63
2023	64
2024	56
2025	42
2026	38
Thereafter	220
Total operating lease payments	483
Less: present value discount	(83)
Total operating lease liabilities	400
Duke Energy Florida
Lessee, Operating Lease, Liability, Payment, Due
2022	55
2023	54
2024	54
2025	54
2026	54
Thereafter	70
Total operating lease payments	341
Less: present value discount	(41)
Total operating lease liabilities	300
Duke Energy Ohio
Lessee, Operating Lease, Liability, Payment, Due
2022	2
2023	2
2024	2
2025	2
2026	2
Thereafter	16
Total operating lease payments	26
Less: present value discount	(7)
Total operating lease liabilities	19
Duke Energy Indiana
Lessee, Operating Lease, Liability, Payment, Due
2022	6
2023	6
2024	4
2025	4
2026	4
Thereafter	50
Total operating lease payments	74
Less: present value discount	(20)
Total operating lease liabilities	54
Piedmont
Lessee, Operating Lease, Liability, Payment, Due
2022	5
2023	5
2024	5
2025	5
Total operating lease payments	20
Less: present value discount	(1)
Total operating lease liabilities	$ 19

Leases (Finance Lease Maturitie

Leases (Finance Lease Maturities) (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Finance Lease, Liability, Payment, Due
2022	$ 201
2023	198
2024	143
2025	76
2026	77
Thereafter	658
Total finance lease payments	1,353
Less: amounts representing interest	(438)
Total finance lease liabilities	915	$ 845
Duke Energy Carolinas
Finance Lease, Liability, Payment, Due
2022	38
2023	38
2024	38
2025	38
2026	38
Thereafter	464
Total finance lease payments	654
Less: amounts representing interest	(365)
Total finance lease liabilities	289	294
Progress Energy
Finance Lease, Liability, Payment, Due
2022	111
2023	103
2024	88
2025	85
2026	86
Thereafter	637
Total finance lease payments	1,110
Less: amounts representing interest	(420)
Total finance lease liabilities	690	377
Duke Energy Progress
Finance Lease, Liability, Payment, Due
2022	86
2023	78
2024	79
2025	80
2026	81
Thereafter	636
Total finance lease payments	1,040
Less: amounts representing interest	(411)
Total finance lease liabilities	629	296
Duke Energy Florida
Finance Lease, Liability, Payment, Due
2022	25
2023	25
2024	9
2025	5
2026	5
Thereafter	1
Total finance lease payments	70
Less: amounts representing interest	(9)
Total finance lease liabilities	61	81
Duke Energy Indiana
Finance Lease, Liability, Payment, Due
2022	1
2023	1
2024	1
2025	1
2026	1
Thereafter	24
Total finance lease payments	29
Less: amounts representing interest	(19)
Total finance lease liabilities	$ 10	$ 10

Leases (Supplemental Financial

Leases (Supplemental Financial Information) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Assets
Operating lease right-of-use assets, net	$ 1,266	$ 1,524
Net property, plant and equipment	950	797
Total lease assets	2,216	2,321
Current
Operating	187	177
Finance	151	129
Noncurrent
Operating	1,074	1,340
Finance	764	716
Total lease liabilities	2,176	2,362
Cash paid for amounts included in the measurement of lease liabilities
Operating cash flows from operating leases	245	271
Operating cash flows from finance leases	55	61
Financing cash flows from finance leases	219	119
Lease assets obtained in exchange for new lease liabilities (non-cash)
Operating	182	116
Finance	$ 322	$ 125
Weighted average remaining lease term (years)
Operating leases	9 years	10 years
Finance leases	10 years	13 years
Weighted-average discount rate
Operating leases	3.60%	3.80%
Finance leases	7.30%	8.40%
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	Public utilities, property, plant and equipment, net	Public utilities, property, plant and equipment, net
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	Current Liabilities: Other	Current Liabilities: Other
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List]	Current maturities of long-term debt	Current maturities of long-term debt
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	Long-Term Debt	Long-Term Debt
Duke Energy Carolinas
Assets
Operating lease right-of-use assets, net	$ 92	$ 110
Net property, plant and equipment	302	312
Total lease assets	394	422
Current
Operating	22	20
Finance	6	5
Noncurrent
Operating	78	97
Finance	283	289
Total lease liabilities	389	411
Cash paid for amounts included in the measurement of lease liabilities
Operating cash flows from operating leases	25	31
Operating cash flows from finance leases	33	30
Financing cash flows from finance leases	5	8
Lease assets obtained in exchange for new lease liabilities (non-cash)
Operating	$ 4	17
Finance		$ 125
Weighted average remaining lease term (years)
Operating leases	9 years	9 years
Finance leases	18 years	19 years
Weighted-average discount rate
Operating leases	3.50%	3.40%
Finance leases	11.60%	11.60%
Progress Energy
Assets
Operating lease right-of-use assets, net	$ 691	$ 690
Net property, plant and equipment	729	416
Total lease assets	1,420	1,106
Current
Operating	94	73
Finance	61	26
Noncurrent
Operating	606	623
Finance	629	351
Total lease liabilities	1,390	1,073
Cash paid for amounts included in the measurement of lease liabilities
Operating cash flows from operating leases	117	124
Operating cash flows from finance leases	48	44
Financing cash flows from finance leases	37	$ 24
Lease assets obtained in exchange for new lease liabilities (non-cash)
Operating	99
Finance	$ 322
Weighted average remaining lease term (years)
Operating leases	8 years	10 years
Finance leases	13 years	15 years
Weighted-average discount rate
Operating leases	3.60%	3.80%
Finance leases	9.00%	11.90%
Duke Energy Progress
Assets
Operating lease right-of-use assets, net	$ 389	$ 346
Net property, plant and equipment	627	297
Total lease assets	1,016	643
Current
Operating	50	31
Finance	41	7
Noncurrent
Operating	350	323
Finance	588	289
Total lease liabilities	1,029	650
Cash paid for amounts included in the measurement of lease liabilities
Operating cash flows from operating leases	62	52
Operating cash flows from finance leases	42	37
Financing cash flows from finance leases	18	$ 6
Lease assets obtained in exchange for new lease liabilities (non-cash)
Operating	99
Finance	$ 322
Weighted average remaining lease term (years)
Operating leases	10 years	12 years
Finance leases	13 years	17 years
Weighted-average discount rate
Operating leases	3.40%	3.90%
Finance leases	9.00%	12.40%
Duke Energy Florida
Assets
Operating lease right-of-use assets, net	$ 302	$ 344
Net property, plant and equipment	102	119
Total lease assets	404	463
Current
Operating	44	42
Finance	20	19
Noncurrent
Operating	256	300
Finance	41	62
Total lease liabilities	361	423
Cash paid for amounts included in the measurement of lease liabilities
Operating cash flows from operating leases	55	72
Operating cash flows from finance leases	6	7
Financing cash flows from finance leases	$ 19	$ 18
Weighted average remaining lease term (years)
Operating leases	7 years	8 years
Finance leases	11 years	11 years
Weighted-average discount rate
Operating leases	3.80%	3.80%
Finance leases	8.20%	8.20%
Duke Energy Ohio
Assets
Operating lease right-of-use assets, net	$ 19	$ 20
Total lease assets	19	20
Current
Operating	1	1
Noncurrent
Operating	18	20
Total lease liabilities	19	21
Cash paid for amounts included in the measurement of lease liabilities
Operating cash flows from operating leases	$ 2	$ 2
Weighted average remaining lease term (years)
Operating leases	16 years	17 years
Weighted-average discount rate
Operating leases	4.20%	4.20%
Duke Energy Indiana
Assets
Operating lease right-of-use assets, net	$ 53	$ 55
Net property, plant and equipment	7	7
Total lease assets	60	62
Current
Operating	4	3
Noncurrent
Operating	50	53
Finance	10	10
Total lease liabilities	64	66
Cash paid for amounts included in the measurement of lease liabilities
Operating cash flows from operating leases	6	6
Financing cash flows from finance leases	$ 1	1
Lease assets obtained in exchange for new lease liabilities (non-cash)
Operating		$ 1
Weighted average remaining lease term (years)
Operating leases	16 years	18 years
Finance leases	24 years	25 years
Weighted-average discount rate
Operating leases	4.10%	4.20%
Finance leases	11.90%	11.90%
Piedmont
Assets
Operating lease right-of-use assets, net	$ 16	$ 20
Total lease assets	16	20
Current
Operating	5	4
Noncurrent
Operating	14	19
Total lease liabilities	19	23
Cash paid for amounts included in the measurement of lease liabilities
Operating cash flows from operating leases	$ 5	$ 5
Weighted average remaining lease term (years)
Operating leases	4 years	5 years
Weighted-average discount rate
Operating leases	3.60%	3.60%

Debt and Credit Facilities (Sum

Debt and Credit Facilities (Summary of Debt and Related Terms) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Weighted Average Interest Rate (as a percent)	3.50%	3.62%
Unsecured Debt	$ 24,564	$ 23,669
Secured Debt	5,584	4,270
First mortgage bonds	31,026	29,177
Finance leases	915	845
Tax exempt bonds	360	477
Notes payable and commercial paper	3,929	3,407
Fair value hedge carrying value adjustment	4	4
Unamortized debt discount and premium, net	1,119	1,217
Unamortized debt issuance costs	(362)	(330)
Total debt	67,139	62,736
Short-term notes payable and commercial paper	(3,304)	(2,873)
Current maturities of long-term debt	(3,387)	(4,238)
Total long-term debt	60,448	55,625
Short term obligations classified as long-term debt	$ 937	$ 937
Unsecured Debt
Debt Instrument [Line Items]
Weighted Average Interest Rate (as a percent)	3.71%	3.71%
Secured Debt
Debt Instrument [Line Items]
Weighted Average Interest Rate (as a percent)	2.50%	2.67%
First Mortgage Bonds
Debt Instrument [Line Items]
Weighted Average Interest Rate (as a percent)	3.87%	4.00%
Capital Lease Obligations
Debt Instrument [Line Items]
Weighted Average Interest Rate (as a percent)	5.81%	6.96%
Tax Exempt Bonds
Debt Instrument [Line Items]
Weighted Average Interest Rate (as a percent)	0.65%	0.75%
Short term obligations classified as long-term debt	$ 312	$ 312
Notes Payable And Commercial Paper
Debt Instrument [Line Items]
Weighted Average Interest Rate (as a percent)	0.35%	0.51%
Short term obligations classified as long-term debt	$ 625	$ 625
Weighted average days to maturity	15 days	23 days
Parent Company | Purchase Accounting Adjustments
Debt Instrument [Line Items]
Unamortized debt issuance costs	$ 29	$ 33
Duke Energy Carolinas
Debt Instrument [Line Items]
Unsecured Debt	1,150	1,150
Secured Debt	1,094	543
First mortgage bonds	10,507	10,008
Finance leases	289	294
Money pool/intercompany borrowings	526	806
Fair value hedge carrying value adjustment	4	4
Unamortized debt discount and premium, net	(21)	(20)
Unamortized debt issuance costs	(67)	(62)
Total debt	13,482	12,723
Short-term money pool/intercompany borrowings	(226)	(506)
Current maturities of long-term debt	(362)	(506)
Total long-term debt	12,894	11,711
Short term obligations classified as long-term debt	300	300
Progress Energy
Debt Instrument [Line Items]
Unsecured Debt	2,250	3,150
Secured Debt	2,397	1,584
First mortgage bonds	15,450	14,100
Finance leases	690	377
Tax exempt bonds	48	48
Money pool/intercompany borrowings	2,959	3,119
Unamortized debt discount and premium, net	(34)	(31)
Unamortized debt issuance costs	(128)	(113)
Total debt	23,632	22,234
Short-term money pool/intercompany borrowings	(2,809)	(2,969)
Current maturities of long-term debt	(1,082)	(1,426)
Total long-term debt	19,741	17,839
Duke Energy Progress
Debt Instrument [Line Items]
Unsecured Debt		700
Secured Debt	1,120	252
First mortgage bonds	8,375	7,875
Finance leases	629	296
Tax exempt bonds	48	48
Money pool/intercompany borrowings	322	445
Unamortized debt discount and premium, net	(19)	(19)
Unamortized debt issuance costs	(54)	(44)
Total debt	10,421	9,553
Short-term money pool/intercompany borrowings	(172)	(295)
Current maturities of long-term debt	(556)	(603)
Total long-term debt	9,693	8,655
Short term obligations classified as long-term debt	150	150
Duke Energy Progress | Purchase Accounting Adjustments
Debt Instrument [Line Items]
Finance leases		24
Duke Energy Florida
Debt Instrument [Line Items]
Unsecured Debt	150	350
Secured Debt	1,278	1,332
First mortgage bonds	7,075	6,225
Finance leases	61	81
Money pool/intercompany borrowings	199	196
Unamortized debt discount and premium, net	(14)	(11)
Unamortized debt issuance costs	(68)	(62)
Total debt	8,681	8,111
Short-term money pool/intercompany borrowings	(199)	(196)
Current maturities of long-term debt	(76)	(823)
Total long-term debt	8,406	7,092
Duke Energy Florida | Purchase Accounting Adjustments
Debt Instrument [Line Items]
Finance leases	256	341
Duke Energy Ohio
Debt Instrument [Line Items]
Unsecured Debt	1,330	1,180
First mortgage bonds	1,850	1,850
Tax exempt bonds	27	77
Money pool/intercompany borrowings	128	194
Unamortized debt discount and premium, net	(27)	(29)
Unamortized debt issuance costs	(13)	(14)
Total debt	3,295	3,258
Short-term money pool/intercompany borrowings	(103)	(169)
Current maturities of long-term debt		(50)
Total long-term debt	3,192	3,039
Short term obligations classified as long-term debt	52	52
Duke Energy Ohio | Tax Exempt Bonds
Debt Instrument [Line Items]
Short term obligations classified as long-term debt	27	27
Duke Energy Indiana
Debt Instrument [Line Items]
Unsecured Debt	700	403
First mortgage bonds	3,219	3,219
Finance leases	10	10
Tax exempt bonds	285	352
Money pool/intercompany borrowings	150	281
Unamortized debt discount and premium, net	(18)	(18)
Unamortized debt issuance costs	(23)	(25)
Total debt	4,323	4,222
Short-term money pool/intercompany borrowings		(131)
Current maturities of long-term debt	(84)	(70)
Total long-term debt	4,239	4,021
Short term obligations classified as long-term debt	435	435
Duke Energy Indiana | Tax Exempt Bonds
Debt Instrument [Line Items]
Short term obligations classified as long-term debt	285	285
Piedmont
Debt Instrument [Line Items]
Unsecured Debt	2,990	2,800
Money pool/intercompany borrowings	518	530
Unamortized debt discount and premium, net	(6)	(5)
Unamortized debt issuance costs	(16)	(15)
Total debt	3,486	3,310
Short-term money pool/intercompany borrowings	(518)	(530)
Current maturities of long-term debt		(160)
Total long-term debt	2,968	2,620
Progress Energy | Purchase Accounting Adjustments
Debt Instrument [Line Items]
Unamortized debt discount and premium, net	1,121	1,196
Piedmont | Purchase Accounting Adjustments
Debt Instrument [Line Items]
Unamortized debt discount and premium, net	$ 100	$ 117

Debt and Credit Facilities (Ann

Debt and Credit Facilities (Annual Maturities) (Details) - USD ($) $ in Millions	1 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Current Maturities Of Long Term Debt [Abstract]
Current maturities of long-term debt	$ 3,387	$ 4,238
Long-term Debt, Fiscal Year Maturity [Abstract]
2022	3,387
2023	4,725
2024	1,917
2025	3,078
2026	3,125
Thereafter	46,844
Total long-term debt, including current maturities	63,076
Purchase accounting adjustments	(1,250)	(1,300)
Other
Current Maturities Of Long Term Debt [Abstract]
Current maturities of long-term debt	434
Purchase Accounting Adjustments
Long-term Debt, Fiscal Year Maturity [Abstract]
Purchase accounting adjustments	$ 1,250
Duke Energy Parent | Debt Maturing March 2022, 3.227% interest rate | Unsecured Debt
Current Maturities Of Long Term Debt [Abstract]
Interest Rate	3.227%
Current maturities of long-term debt	$ 300
Duke Energy Parent | Debt Maturing March 2022, 0.775%, floating interest rate | Unsecured Debt
Current Maturities Of Long Term Debt [Abstract]
Interest Rate	0.851%
Current maturities of long-term debt	$ 300
Duke Energy Parent | Debt Maturing August 2022, 3.050% interest rate | Unsecured Debt
Current Maturities Of Long Term Debt [Abstract]
Interest Rate	3.05%
Current maturities of long-term debt	$ 500
Duke Energy Parent | Debt Maturing August 2022, 2.400% interest rate | Unsecured Debt
Current Maturities Of Long Term Debt [Abstract]
Interest Rate	2.40%
Current maturities of long-term debt	$ 500
Progress Energy
Current Maturities Of Long Term Debt [Abstract]
Current maturities of long-term debt	1,082	1,426
Long-term Debt, Fiscal Year Maturity [Abstract]
2022	1,082
2023	1,046
2024	138
2025	639
2026	310
Thereafter	17,766
Total long-term debt, including current maturities	$ 20,981
Progress Energy | Debt Maturing April 2022, 3.150% interest rate | Unsecured Debt
Current Maturities Of Long Term Debt [Abstract]
Interest Rate	3.15%
Current maturities of long-term debt	$ 450
Duke Energy Indiana
Current Maturities Of Long Term Debt [Abstract]
Current maturities of long-term debt	84	70
Long-term Debt, Fiscal Year Maturity [Abstract]
2022	84
2023	303
2024	4
2025	4
2026	154
Thereafter	3,814
Total long-term debt, including current maturities	$ 4,363
Duke Energy Indiana | Debt Maturing January 2022, 8.850% interest rate | First Mortgage Bonds
Current Maturities Of Long Term Debt [Abstract]
Interest Rate	8.85%
Current maturities of long-term debt	$ 53
Duke Energy Carolinas
Current Maturities Of Long Term Debt [Abstract]
Current maturities of long-term debt	362	506
Long-term Debt, Fiscal Year Maturity [Abstract]
2022	362
2023	1,018
2024	19
2025	496
2026	921
Thereafter	10,528
Total long-term debt, including current maturities	$ 13,344
Duke Energy Carolinas | Debt Maturing May 2022, 3.350% interest rate | First Mortgage Bonds
Current Maturities Of Long Term Debt [Abstract]
Interest Rate	3.35%
Current maturities of long-term debt	$ 350
Duke Energy Progress
Current Maturities Of Long Term Debt [Abstract]
Current maturities of long-term debt	556	603
Long-term Debt, Fiscal Year Maturity [Abstract]
2022	556
2023	719
2024	72
2025	575
2026	229
Thereafter	8,168
Total long-term debt, including current maturities	$ 10,319
Duke Energy Progress | Debt Maturing May 2022, 2.800%, interest rate | First Mortgage Bonds
Current Maturities Of Long Term Debt [Abstract]
Interest Rate	2.80%
Current maturities of long-term debt	$ 500
Duke Energy Progress | Debt Maturing February 2022, 0.305%, floating interest rate | Unsecured Debt
Current Maturities Of Long Term Debt [Abstract]
Extinguishment of debt, amount	700
Duke Energy Florida
Current Maturities Of Long Term Debt [Abstract]
Current maturities of long-term debt	76	823
Long-term Debt, Fiscal Year Maturity [Abstract]
2022	76
2023	327
2024	66
2025	64
2026	81
Thereafter	7,949
Total long-term debt, including current maturities	8,563
Duke Energy Ohio
Current Maturities Of Long Term Debt [Abstract]
Current maturities of long-term debt		50
Long-term Debt, Fiscal Year Maturity [Abstract]
2023	475
2025	245
2026	70
Thereafter	2,442
Total long-term debt, including current maturities	3,232
Piedmont
Current Maturities Of Long Term Debt [Abstract]
Current maturities of long-term debt		$ 160
Long-term Debt, Fiscal Year Maturity [Abstract]
2023	45
2024	40
2025	205
2026	40
Thereafter	2,660
Total long-term debt, including current maturities	$ 2,990

Debt and Credit Facilities (Sho

Debt and Credit Facilities (Short Term Obligations Classified As Long Term) (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Short term obligations classified as long-term debt	$ 937	$ 937
Tax Exempt Bonds
Debt Instrument [Line Items]
Short term obligations classified as long-term debt	312	312
Commercial Paper
Debt Instrument [Line Items]
Short term obligations classified as long-term debt	625	625
Duke Energy Carolinas
Debt Instrument [Line Items]
Short term obligations classified as long-term debt	300	300
Duke Energy Carolinas | Commercial Paper
Debt Instrument [Line Items]
Short term obligations classified as long-term debt	300	300
Duke Energy Progress
Debt Instrument [Line Items]
Short term obligations classified as long-term debt	150	150
Duke Energy Progress | Commercial Paper
Debt Instrument [Line Items]
Short term obligations classified as long-term debt	150	150
Duke Energy Ohio
Debt Instrument [Line Items]
Short term obligations classified as long-term debt	52	52
Duke Energy Ohio | Tax Exempt Bonds
Debt Instrument [Line Items]
Short term obligations classified as long-term debt	27	27
Duke Energy Ohio | Commercial Paper
Debt Instrument [Line Items]
Short term obligations classified as long-term debt	25	25
Duke Energy Indiana
Debt Instrument [Line Items]
Short term obligations classified as long-term debt	435	435
Duke Energy Indiana | Tax Exempt Bonds
Debt Instrument [Line Items]
Short term obligations classified as long-term debt	285	285
Duke Energy Indiana | Commercial Paper
Debt Instrument [Line Items]
Short term obligations classified as long-term debt	$ 150	$ 150

Debt and Credit Facilities (S_2

Debt and Credit Facilities (Summary of Debt Issuances) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Debt issuances	$ 8,107,000,000	$ 5,550,000,000
Repayments of long-term debt	$ 5,294,000,000	$ 4,506,000,000	$ 3,476,000,000
March 2021 Notes Due March 2031 | Unsecured Debt
Debt Instrument [Line Items]
Interest Rate	2.50%
Debt issuances	$ 350,000,000
June 2021 Notes Due June 2023 | Unsecured Debt
Debt Instrument [Line Items]
Interest Rate	0.299%
Debt issuances	$ 500,000,000
June 2021 Notes Due June 2031 | Unsecured Debt
Debt Instrument [Line Items]
Interest Rate	2.55%
Debt issuances	$ 1,000,000,000
June 2021 Notes Due June 2041 | Unsecured Debt
Debt Instrument [Line Items]
Interest Rate	3.30%
Debt issuances	$ 750,000,000
June 2021 Notes Due June 2051 | Unsecured Debt
Debt Instrument [Line Items]
Interest Rate	3.50%
Debt issuances	$ 750,000,000
September 2021 Notes Due January 2082 | Unsecured Debt
Debt Instrument [Line Items]
Interest Rate	3.25%
Debt issuances	$ 500,000,000
Repayments of long-term debt	$ 500,000,000
Interest rate reset period	5 years
November 2021 Notes Due July 2031 | Secured Debt
Debt Instrument [Line Items]
Interest Rate	1.679%
Debt issuances	$ 100,000,000
November 2021 Notes Due July 2041 | Secured Debt
Debt Instrument [Line Items]
Interest Rate	2.617%
Debt issuances	$ 137,000,000
November 2021 Notes Due July 2028 | Secured Debt
Debt Instrument [Line Items]
Interest Rate	1.295%
Debt issuances	$ 221,000,000
November 2021 Notes Due July 2037 | Secured Debt
Debt Instrument [Line Items]
Interest Rate	2.387%
Debt issuances	$ 352,000,000
November 2021 Notes Due July 2041 (2) | Secured Debt
Debt Instrument [Line Items]
Interest Rate	2.799%
Debt issuances	$ 197,000,000
April 2021 Notes Due April 2031 | First Mortgage Bonds
Debt Instrument [Line Items]
Interest Rate	2.55%
Debt issuances	$ 550,000,000
April 2021 Notes Due April 2051 | First Mortgage Bonds
Debt Instrument [Line Items]
Interest Rate	3.45%
Debt issuances	$ 450,000,000
August 2021 Notes Due August 2031 | First Mortgage Bonds
Debt Instrument [Line Items]
Interest Rate	2.00%
Debt issuances	$ 650,000,000
August 2021 Notes Due August 2051 | First Mortgage Bonds
Debt Instrument [Line Items]
Interest Rate	2.90%
Debt issuances	$ 450,000,000
December 2021 Notes Due December 2031 | First Mortgage Bonds
Debt Instrument [Line Items]
Interest Rate	2.40%
Debt issuances	$ 650,000,000
December 2021 Notes Due December 2051 | First Mortgage Bonds
Debt Instrument [Line Items]
Interest Rate	3.00%
Debt issuances	$ 500,000,000
May 2020 Debt Issuance Due June 2030 | Unsecured Debt
Debt Instrument [Line Items]
Interest Rate		2.45%
Debt issuances		$ 500,000,000
May 2020 Debt Issuance Due June 2030 | First Mortgage Bonds
Debt Instrument [Line Items]
Interest Rate		2.125%
Debt issuances		$ 400,000,000
May 2020 Debt Issuance Due June 2050 | Unsecured Debt
Debt Instrument [Line Items]
Interest Rate		3.35%
Debt issuances		$ 400,000,000
August 2020 Debt Issuance Due February 2022 | Unsecured Debt
Debt Instrument [Line Items]
Interest Rate		0.40%
Debt issuances		$ 700,000,000
September 2020 Debt Issuance Due September 2025 | Unsecured Debt
Debt Instrument [Line Items]
Interest Rate		0.90%
Debt issuances		$ 650,000,000
September 2020 Debt Issuance Due June 2030 | Unsecured Debt
Debt Instrument [Line Items]
Interest Rate		2.45%
Debt issuances		$ 350,000,000
January 2020 Debt Issuance 2.450% Coupon Due 2030 | First Mortgage Bonds
Debt Instrument [Line Items]
Interest Rate		2.45%
Debt issuances		$ 500,000,000
January 2020 Debt Issuance 3.20% Due August 2049 | First Mortgage Bonds
Debt Instrument [Line Items]
Interest Rate		3.20%
Debt issuances		$ 400,000,000
March 2020 Debt Issuance 2.750% Due April 2050 | First Mortgage Bonds
Debt Instrument [Line Items]
Interest Rate		2.75%
Debt issuances		$ 550,000,000
June 2020 Debt Issuance Due June 2030 | First Mortgage Bonds
Debt Instrument [Line Items]
Interest Rate		1.75%
Debt issuances		$ 500,000,000
August 2020 Debt Issuance Due August 2050 | First Mortgage Bonds
Debt Instrument [Line Items]
Interest Rate		2.50%
Debt issuances		$ 600,000,000
Parent Company
Debt Instrument [Line Items]
Debt issuances	3,500,000,000	1,500,000,000
Parent Company | May 2020 Debt Issuance Due June 2030 | Unsecured Debt
Debt Instrument [Line Items]
Debt issuances		500,000,000
Parent Company | September 2020 Debt Issuance Due September 2025 | Unsecured Debt
Debt Instrument [Line Items]
Debt issuances		650,000,000
Parent Company | September 2020 Debt Issuance Due June 2030 | Unsecured Debt
Debt Instrument [Line Items]
Debt issuances		350,000,000
Duke Energy Parent
Debt Instrument [Line Items]
Repayments of long-term debt	1,750,000,000
Duke Energy Parent | June 2021 Notes Due June 2023 | Unsecured Debt
Debt Instrument [Line Items]
Debt issuances	500,000,000
Duke Energy Parent | June 2021 Notes Due June 2031 | Unsecured Debt
Debt Instrument [Line Items]
Debt issuances	1,000,000,000
Duke Energy Parent | June 2021 Notes Due June 2041 | Unsecured Debt
Debt Instrument [Line Items]
Debt issuances	750,000,000
Duke Energy Parent | June 2021 Notes Due June 2051 | Unsecured Debt
Debt Instrument [Line Items]
Debt issuances	750,000,000
Duke Energy Parent | September 2021 Notes Due January 2082 | Unsecured Debt
Debt Instrument [Line Items]
Debt issuances	500,000,000
Duke Energy Parent | Term Loan Due March 2021
Debt Instrument [Line Items]
Repayments of long-term debt		1,700,000,000
Duke Energy Carolinas
Debt Instrument [Line Items]
Debt issuances	1,237,000,000	900,000,000
Repayments of long-term debt	617,000,000	813,000,000	6,000,000
Duke Energy Carolinas | November 2021 Notes Due July 2031 | Secured Debt
Debt Instrument [Line Items]
Debt issuances	100,000,000
Duke Energy Carolinas | November 2021 Notes Due July 2041 | Secured Debt
Debt Instrument [Line Items]
Debt issuances	137,000,000
Duke Energy Carolinas | April 2021 Notes Due April 2031 | First Mortgage Bonds
Debt Instrument [Line Items]
Debt issuances	550,000,000
Duke Energy Carolinas | April 2021 Notes Due April 2051 | First Mortgage Bonds
Debt Instrument [Line Items]
Debt issuances	450,000,000
Duke Energy Carolinas | Bonds Maturing June 2021, 3.900% Coupon | First Mortgage Bonds
Debt Instrument [Line Items]
Repayments of long-term debt	500,000,000
Duke Energy Carolinas | January 2020 Debt Issuance 2.450% Coupon Due 2030 | First Mortgage Bonds
Debt Instrument [Line Items]
Debt issuances		500,000,000
Duke Energy Carolinas | January 2020 Debt Issuance 3.20% Due August 2049 | First Mortgage Bonds
Debt Instrument [Line Items]
Debt issuances		400,000,000
Duke Energy Carolinas | Bonds Maturing June 2020, 4.300% Coupon | First Mortgage Bonds
Debt Instrument [Line Items]
Repayments of long-term debt		450,000,000
Duke Energy Progress
Debt Instrument [Line Items]
Debt issuances	1,870,000,000	1,300,000,000
Repayments of long-term debt	1,308,000,000	1,085,000,000	605,000,000
Duke Energy Progress | First Mortgage Bonds
Debt Instrument [Line Items]
Repayments of long-term debt	600,000,000
Duke Energy Progress | Term Loan
Debt Instrument [Line Items]
Repayments of long-term debt		700,000,000
Duke Energy Progress | November 2021 Notes Due July 2028 | Secured Debt
Debt Instrument [Line Items]
Debt issuances	221,000,000
Duke Energy Progress | November 2021 Notes Due July 2037 | Secured Debt
Debt Instrument [Line Items]
Debt issuances	352,000,000
Duke Energy Progress | November 2021 Notes Due July 2041 (2) | Secured Debt
Debt Instrument [Line Items]
Debt issuances	197,000,000
Duke Energy Progress | August 2021 Notes Due August 2031 | First Mortgage Bonds
Debt Instrument [Line Items]
Debt issuances	650,000,000
Duke Energy Progress | August 2021 Notes Due August 2051 | First Mortgage Bonds
Debt Instrument [Line Items]
Debt issuances	450,000,000
Duke Energy Progress | August 2020 Debt Issuance Due February 2022 | Unsecured Debt
Debt Instrument [Line Items]
Debt issuances		700,000,000
Duke Energy Progress | August 2020 Debt Issuance Due August 2050 | First Mortgage Bonds
Debt Instrument [Line Items]
Debt issuances		600,000,000
Duke Energy Progress | Bonds Due September 2020 | First Mortgage Bonds
Debt Instrument [Line Items]
Repayments of long-term debt		300,000,000
Duke Energy Florida
Debt Instrument [Line Items]
Debt issuances	1,150,000,000	500,000,000
Repayments of long-term debt	575,000,000	572,000,000	262,000,000
Duke Energy Florida | December 2021 Notes Due December 2031 | First Mortgage Bonds
Debt Instrument [Line Items]
Debt issuances	650,000,000
Duke Energy Florida | December 2021 Notes Due December 2051 | First Mortgage Bonds
Debt Instrument [Line Items]
Debt issuances	500,000,000
Duke Energy Florida | June 2020 Debt Issuance Due June 2030 | First Mortgage Bonds
Debt Instrument [Line Items]
Debt issuances		500,000,000
Piedmont
Debt Instrument [Line Items]
Debt issuances	350,000,000	400,000,000
Repayments of long-term debt	160,000,000		350,000,000
Piedmont | Unsecured Debt
Debt Instrument [Line Items]
Repayments of long-term debt	160,000,000
Piedmont | March 2021 Notes Due March 2031 | Unsecured Debt
Debt Instrument [Line Items]
Debt issuances	350,000,000
Piedmont | May 2020 Debt Issuance Due June 2050 | Unsecured Debt
Debt Instrument [Line Items]
Debt issuances		400,000,000
Duke Energy Ohio
Debt Instrument [Line Items]
Debt issuances		400,000,000
Repayments of long-term debt	50,000,000		551,000,000
Duke Energy Ohio | May 2020 Debt Issuance Due June 2030 | First Mortgage Bonds
Debt Instrument [Line Items]
Debt issuances		400,000,000
Duke Energy Indiana
Debt Instrument [Line Items]
Debt issuances		550,000,000
Repayments of long-term debt	$ 70,000,000	513,000,000	$ 213,000,000
Duke Energy Indiana | March 2020 Debt Issuance 2.750% Due April 2050 | First Mortgage Bonds
Debt Instrument [Line Items]
Debt issuances		550,000,000
Duke Energy Indiana | Bonds Due July 2020 | First Mortgage Bonds
Debt Instrument [Line Items]
Repayments of long-term debt		500,000,000
Revolving Credit Facility | Duke Energy Parent
Debt Instrument [Line Items]
Repayments of long-term debt		$ 500,000,000

Debt and Credit Facilities (Nar

Debt and Credit Facilities (Narrative) (Details)	1 Months Ended	3 Months Ended	12 Months Ended
	Oct. 31, 2021USD ($)	Jun. 30, 2020USD ($)	Dec. 31, 2021USD ($)	Mar. 31, 2021USD ($)	Dec. 31, 2020USD ($)	Mar. 31, 2020USD ($)
Debt Instrument [Line Items]
Demand notes, maximum amount available for sale			$ 3,000,000,000
Demand notes, maximum amount outstanding			1,500,000,000
Principal amount of demand notes			1,066,000,000		$ 1,168,000,000
Other loans outstanding against cash surrender value of life insurance policies			819,000,000		817,000,000
Duke Energy Progress
Debt Instrument [Line Items]
Other loans outstanding against cash surrender value of life insurance policies			$ 34,000,000		$ 35,000,000
Maximum
Debt Instrument [Line Items]
Debt to total capitalization percentage, for each borrower			0.65
Maximum | Duke Energy Ohio
Debt Instrument [Line Items]
Debt to total capitalization percentage, for each borrower			0.65
Maximum | Duke Energy Indiana
Debt Instrument [Line Items]
Debt to total capitalization percentage, for each borrower			0.65
Maximum | Duke Energy Progress
Debt Instrument [Line Items]
Debt to total capitalization percentage, for each borrower			0.65
Maximum | Progress Energy
Debt Instrument [Line Items]
Debt to total capitalization percentage, for each borrower			0.65
Maximum | Duke Energy Carolinas
Debt Instrument [Line Items]
Debt to total capitalization percentage, for each borrower			0.65
Maximum | Duke Energy Florida
Debt Instrument [Line Items]
Debt to total capitalization percentage, for each borrower			0.65
Maximum | Piedmont
Debt Instrument [Line Items]
Debt to total capitalization percentage, for each borrower			0.70
Revolving Credit Facility
Debt Instrument [Line Items]
Facility size			$ 8,000,000,000	$ 8,000,000,000
Revolving Credit Facility | Duke Energy Ohio
Debt Instrument [Line Items]
Facility size			775,000,000
Revolving Credit Facility | Duke Energy Indiana
Debt Instrument [Line Items]
Facility size			600,000,000
Revolving Credit Facility | Duke Energy Progress
Debt Instrument [Line Items]
Facility size			1,150,000,000
Revolving Credit Facility | Duke Energy Carolinas
Debt Instrument [Line Items]
Facility size			1,225,000,000
Revolving Credit Facility | Duke Energy Florida
Debt Instrument [Line Items]
Facility size			900,000,000
Revolving Credit Facility | Piedmont
Debt Instrument [Line Items]
Facility size			700,000,000
Revolving Credit Facility | Line of Credit | Duke Energy Ohio
Debt Instrument [Line Items]
Facility size	$ 100,000,000
Term of debt instrument	2 years
Revolving Credit Facility | Line of Credit | Duke Energy Indiana
Debt Instrument [Line Items]
Facility size	$ 300,000,000
Term of debt instrument	2 years
Revolving Credit Facility | Line of Credit | Duke Energy Kentucky
Debt Instrument [Line Items]
Facility size	$ 50,000,000
Term of debt instrument	2 years
Revolving Credit Facility | Line of Credit | Progress Energy
Debt Instrument [Line Items]
Facility size			2,500,000,000
June 2017 Three Year Revolving Credit Facility
Debt Instrument [Line Items]
Facility size			$ 1,000,000,000
Term of debt instrument			3 years
Long-term line of credit			$ 500,000,000			$ 500,000,000
Repayments of debt		$ 500,000,000

Debt and Credit Facilities (Sch

Debt and Credit Facilities (Schedule of Line of Credit Facilities) (Details) - USD ($)	Dec. 31, 2021	Mar. 31, 2021	Dec. 31, 2020
Line of Credit Facility [Line Items]
Tax-exempt bonds	$ (360,000,000)		$ (477,000,000)
Duke Energy Progress
Line of Credit Facility [Line Items]
Tax-exempt bonds	(48,000,000)		(48,000,000)
Duke Energy Ohio
Line of Credit Facility [Line Items]
Tax-exempt bonds	(27,000,000)		(77,000,000)
Duke Energy Indiana
Line of Credit Facility [Line Items]
Tax-exempt bonds	(285,000,000)		$ (352,000,000)
Revolving Credit Facility
Line of Credit Facility [Line Items]
Facility size	8,000,000,000	$ 8,000,000,000
Commercial paper	(2,863,000,000)
Outstanding letters of credit	(38,000,000)
Tax-exempt bonds	(81,000,000)
Available capacity	5,018,000,000
Revolving Credit Facility | Parent Company
Line of Credit Facility [Line Items]
Facility size	2,650,000,000
Commercial paper	(1,128,000,000)
Outstanding letters of credit	(25,000,000)
Available capacity	1,497,000,000
Revolving Credit Facility | Duke Energy Carolinas
Line of Credit Facility [Line Items]
Facility size	1,225,000,000
Commercial paper	(506,000,000)
Outstanding letters of credit	(4,000,000)
Available capacity	715,000,000
Revolving Credit Facility | Duke Energy Progress
Line of Credit Facility [Line Items]
Facility size	1,150,000,000
Commercial paper	(307,000,000)
Outstanding letters of credit	(2,000,000)
Available capacity	841,000,000
Revolving Credit Facility | Duke Energy Florida
Line of Credit Facility [Line Items]
Facility size	900,000,000
Commercial paper	(181,000,000)
Outstanding letters of credit	(7,000,000)
Available capacity	712,000,000
Revolving Credit Facility | Duke Energy Ohio
Line of Credit Facility [Line Items]
Facility size	775,000,000
Commercial paper	(119,000,000)
Available capacity	656,000,000
Revolving Credit Facility | Duke Energy Indiana
Line of Credit Facility [Line Items]
Facility size	600,000,000
Commercial paper	(150,000,000)
Tax-exempt bonds	(81,000,000)
Available capacity	369,000,000
Revolving Credit Facility | Piedmont
Line of Credit Facility [Line Items]
Facility size	700,000,000
Commercial paper	(472,000,000)
Available capacity	228,000,000
Proceeds Loaned To Subsidiary Registrants | Revolving Credit Facility | Parent Company
Line of Credit Facility [Line Items]
Commercial paper	$ (625,000,000)

Guarantees and Indemnificatio_2

Guarantees and Indemnifications (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2021	Feb. 28, 2021	Jul. 31, 2020	Jan. 01, 2020	Oct. 31, 2017
Guarantor Obligations [Line Items]
Unused letters of credit		$ 54
Noncurrent Liabilities
Guarantor Obligations [Line Items]
Face value of guarantees	$ 11	3
Letters of credit
Guarantor Obligations [Line Items]
Maximum potential amount of future payments associated with guarantees		586
ACP
Guarantor Obligations [Line Items]
Maximum borrowing capacity				$ 1,900		$ 3,400
ACP | Atlantic Coast Pipeline (ACP)
Guarantor Obligations [Line Items]
Off-balance sheet, credit loss, liability					$ 95
ACP | Current Liabilities | Atlantic Coast Pipeline (ACP)
Guarantor Obligations [Line Items]
Guarantor obligations settled			$ 855
Atlantic Coast Pipeline (ACP) | Current Liabilities | Atlantic Coast Pipeline (ACP)
Guarantor Obligations [Line Items]
Guarantor obligations settled			$ 855
Performance guarantee | Customers and other third parties
Guarantor Obligations [Line Items]
Maximum potential amount of future payments associated with guarantees		53
Performance guarantee | Spectra Capital
Guarantor Obligations [Line Items]
Maximum potential amount of future payments associated with guarantees		$ 48
Financial guarantee | ACP
Guarantor Obligations [Line Items]
Maximum potential amount of future payments associated with guarantees	$ 860
Maximum exposure percentage	47.00%

Joint Ownership of Generating_3

Joint Ownership of Generating and Transmission Facilities (Schedule Joint Ownership of Generating and Transmission Facilities) (Details) $ in Millions	Dec. 31, 2021USD ($)
Duke Energy Carolinas | Catawba (units 1 and 2)
Jointly Owned Utility Plant Interests [Line Items]
Ownership interest	19.25%
Property, plant, and equipment	$ 1,044
Accumulated depreciation	525
Construction work in progress	$ 20
Duke Energy Carolinas | W.S. Lee CC
Jointly Owned Utility Plant Interests [Line Items]
Ownership interest	87.27%
Property, plant, and equipment	$ 632
Accumulated depreciation	67
Construction work in progress	$ 3
Duke Energy Indiana | Gibson (unit 5)
Jointly Owned Utility Plant Interests [Line Items]
Ownership interest	50.05%
Property, plant, and equipment	$ 440
Accumulated depreciation	221
Construction work in progress	$ 3
Duke Energy Indiana | Vermillion
Jointly Owned Utility Plant Interests [Line Items]
Ownership interest	62.50%
Property, plant, and equipment	$ 175
Accumulated depreciation	108
Construction work in progress	5
Duke Energy Indiana | Transmission and local facilities
Jointly Owned Utility Plant Interests [Line Items]
Property, plant, and equipment	6,164
Accumulated depreciation	1,477
Construction work in progress	$ 190

Asset Retirement Obligations (R

Asset Retirement Obligations (Recorded on the Balance Sheet) (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Asset Retirement Obligation [Line Items]
Total asset retirement obligation	$ 12,776	$ 13,004	$ 13,318
Less: Current portion	647	718
Total noncurrent asset retirement obligation	12,129	12,286
Decommissioning of nuclear power facilities
Asset Retirement Obligation [Line Items]
Total asset retirement obligation	7,046
Closure of ash impoundments
Asset Retirement Obligation [Line Items]
Total asset retirement obligation	5,293
Other
Asset Retirement Obligation [Line Items]
Total asset retirement obligation	437
Duke Energy Carolinas
Asset Retirement Obligation [Line Items]
Total asset retirement obligation	5,301	5,350	5,734
Less: Current portion	249	264
Total noncurrent asset retirement obligation	5,052	5,086
Duke Energy Carolinas | Decommissioning of nuclear power facilities
Asset Retirement Obligation [Line Items]
Total asset retirement obligation	2,847
Duke Energy Carolinas | Closure of ash impoundments
Asset Retirement Obligation [Line Items]
Total asset retirement obligation	2,390
Duke Energy Carolinas | Other
Asset Retirement Obligation [Line Items]
Total asset retirement obligation	64
Progress Energy
Asset Retirement Obligation [Line Items]
Total asset retirement obligation	6,112	6,149	6,471
Less: Current portion	275	283
Total noncurrent asset retirement obligation	5,837	5,866
Progress Energy | Decommissioning of nuclear power facilities
Asset Retirement Obligation [Line Items]
Total asset retirement obligation	4,156
Progress Energy | Closure of ash impoundments
Asset Retirement Obligation [Line Items]
Total asset retirement obligation	1,872
Progress Energy | Other
Asset Retirement Obligation [Line Items]
Total asset retirement obligation	84
Duke Energy Progress
Asset Retirement Obligation [Line Items]
Total asset retirement obligation	5,675	5,635	5,893
Less: Current portion	274	283
Total noncurrent asset retirement obligation	5,401	5,352
Duke Energy Progress | Decommissioning of nuclear power facilities
Asset Retirement Obligation [Line Items]
Total asset retirement obligation	3,792
Duke Energy Progress | Closure of ash impoundments
Asset Retirement Obligation [Line Items]
Total asset retirement obligation	1,839
Duke Energy Progress | Other
Asset Retirement Obligation [Line Items]
Total asset retirement obligation	44
Duke Energy Florida
Asset Retirement Obligation [Line Items]
Total asset retirement obligation	437	514	578
Less: Current portion	1
Total noncurrent asset retirement obligation	436	514
Duke Energy Florida | Decommissioning of nuclear power facilities
Asset Retirement Obligation [Line Items]
Total asset retirement obligation	364
Duke Energy Florida | Closure of ash impoundments
Asset Retirement Obligation [Line Items]
Total asset retirement obligation	33
Duke Energy Florida | Other
Asset Retirement Obligation [Line Items]
Total asset retirement obligation	40
Duke Energy Ohio
Asset Retirement Obligation [Line Items]
Total asset retirement obligation	136	111	80
Less: Current portion	13	3
Total noncurrent asset retirement obligation	123	108
Duke Energy Ohio | Closure of ash impoundments
Asset Retirement Obligation [Line Items]
Total asset retirement obligation	82
Duke Energy Ohio | Other
Asset Retirement Obligation [Line Items]
Total asset retirement obligation	54
Duke Energy Indiana
Asset Retirement Obligation [Line Items]
Total asset retirement obligation	987	1,176	832
Less: Current portion	110	168
Total noncurrent asset retirement obligation	877	1,008
Duke Energy Indiana | Closure of ash impoundments
Asset Retirement Obligation [Line Items]
Total asset retirement obligation	949
Duke Energy Indiana | Other
Asset Retirement Obligation [Line Items]
Total asset retirement obligation	38
Piedmont
Asset Retirement Obligation [Line Items]
Total asset retirement obligation	22	20	$ 17
Total noncurrent asset retirement obligation	22	$ 20
Piedmont | Other
Asset Retirement Obligation [Line Items]
Total asset retirement obligation	$ 22

Asset Retirement Obligations (N

Asset Retirement Obligations (NDTF Information) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
NDTF Information [Abstract]
Annual funding requirement	$ 15
Decommissioning costs	9,105
Legally restricted NDTF investments, fair value	8,933	$ 7,726
Duke Energy Carolinas
NDTF Information [Abstract]
Decommissioning costs	4,365
Legally restricted NDTF investments, fair value	5,068	4,381
Duke Energy Progress
NDTF Information [Abstract]
Annual funding requirement	15
Decommissioning costs	4,181
Legally restricted NDTF investments, fair value	3,865	$ 3,345
Duke Energy Florida
NDTF Information [Abstract]
Decommissioning costs	$ 559

Asset Retirement Obligations _2

Asset Retirement Obligations (Narrative) (Details)	12 Months Ended
	Dec. 31, 2021
Nuclear Regulatory Commission
Asset Retirement Obligation [Line Items]
Operating license extension	20 years

Asset Retirement Obligations _3

Asset Retirement Obligations (Rollforward) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Asset Retirement Obligation [Line Items]
Beginning Balance	$ 13,004	$ 13,318
Accretion expense	512	542
Liabilities settled	(613)	(724)
Liabilities incurred in the current year	32	22
Revisions in estimates of cash flows	(159)	(154)
Ending Balance	12,776	13,004
Duke Energy Carolinas
Asset Retirement Obligation [Line Items]
Beginning Balance	5,350	5,734
Accretion expense	242	258
Liabilities settled	(210)	(198)
Liabilities incurred in the current year	8
Revisions in estimates of cash flows	(89)	(444)
Ending Balance	5,301	5,350
Progress Energy
Asset Retirement Obligation [Line Items]
Beginning Balance	6,149	6,471
Accretion expense	229	246
Liabilities settled	(324)	(451)
Liabilities incurred in the current year	6	5
Revisions in estimates of cash flows	52	(122)
Ending Balance	6,112	6,149
Duke Energy Progress
Asset Retirement Obligation [Line Items]
Beginning Balance	5,635	5,893
Accretion expense	212	225
Liabilities settled	(214)	(358)
Revisions in estimates of cash flows	42	(125)
Ending Balance	5,675	5,635
Duke Energy Florida
Asset Retirement Obligation [Line Items]
Beginning Balance	514	578
Accretion expense	17	21
Liabilities settled	(110)	(93)
Liabilities incurred in the current year	6	5
Revisions in estimates of cash flows	10	3
Ending Balance	437	514
Duke Energy Ohio
Asset Retirement Obligation [Line Items]
Beginning Balance	111	80
Accretion expense	4	4
Liabilities settled	(3)	(2)
Revisions in estimates of cash flows	24	29
Ending Balance	136	111
Duke Energy Indiana
Asset Retirement Obligation [Line Items]
Beginning Balance	1,176	832
Accretion expense	35	33
Liabilities settled	(77)	(74)
Revisions in estimates of cash flows	(147)	385
Ending Balance	987	1,176
Piedmont
Asset Retirement Obligation [Line Items]
Beginning Balance	20	17
Accretion expense	1	1
Revisions in estimates of cash flows	1	2
Ending Balance	$ 22	$ 20

Property, Plant and Equipment_2

Property, Plant and Equipment (Schedule Of Property, Plant and Equipment) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Equipment, estimated useful life, years	13 years	15 years
Land	$ 2,162	$ 2,046
Other buildings and improvements	5,289	5,090
Equipment	2,659	2,608
Construction in process	6,168	6,645
Total property, plant and equipment	161,819	155,580
Facilities to be retired, net	144	29
Total net property, plant and equipment	$ 111,408	$ 106,782
Other, estimated useful life, in years	14 years	14 years
Finance leases, gross	$ 958	$ 832
Accumulated amortization of finance leases	9	12
Capitalized Interest Costs [Abstract]
Capitalized interest	72	112	$ 159
Nuclear fuel
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Nuclear fuel	3,181	3,284
Accumulated depreciation and amortization	(1,799)	(1,832)
Consolidated VIEs
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Total property, plant and equipment	7,339	6,394
Accumulated depreciation and amortization	(1,474)	(1,242)
Regulated
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Accumulated depreciation and amortization	$ (47,611)	$ (46,216)
Regulated | Electric generation, distribution and transmission
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Equipment, estimated useful life, years	40 years	39 years
Plant - transmission and distribution	$ 120,855	$ 117,107
Regulated | Natural gas transmission and distribution
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Equipment, estimated useful life, years	54 years	54 years
Plant - transmission and distribution	$ 12,079	$ 10,799
Regulated | Other buildings and improvements
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Equipment, estimated useful life, years	37 years	36 years
Other buildings and improvements	$ 1,921	$ 2,038
Nonregulated
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Accumulated depreciation and amortization	(2,944)	(2,611)
Accumulated amortization of finance leases	$ (1)	$ 23
Nonregulated | Electric generation, distribution and transmission
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Equipment, estimated useful life, years	28 years	27 years
Plant - transmission and distribution	$ 7,104	$ 5,444
Nonregulated | Other buildings and improvements
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Equipment, estimated useful life, years	11 years	10 years
Other buildings and improvements	$ 401	$ 519
Duke Energy Carolinas
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Land	543	536
Other buildings and improvements	1,323	1,203
Equipment	614	620
Construction in process	2,078	1,645
Total property, plant and equipment	51,874	50,640
Facilities to be retired, net	102
Total net property, plant and equipment	34,122	33,187
Finance leases, gross	335	335
Accumulated amortization of finance leases	33	23
Capitalized Interest Costs [Abstract]
Capitalized interest	29	28	30
Duke Energy Carolinas | Nuclear fuel
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Nuclear fuel	1,856	1,837
Accumulated depreciation and amortization	(1,064)	(1,010)
Duke Energy Carolinas | Regulated
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Accumulated depreciation and amortization	(17,854)	(17,453)
Duke Energy Carolinas | Regulated | Electric generation, distribution and transmission
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Plant - transmission and distribution	44,910	44,059
Duke Energy Carolinas | Regulated | Other buildings and improvements
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Other buildings and improvements	550	740
Progress Energy
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Land	957	908
Other buildings and improvements	1,563	1,521
Equipment	791	759
Construction in process	2,297	2,013
Total property, plant and equipment	60,894	57,892
Facilities to be retired, net	26	29
Total net property, plant and equipment	41,706	39,553
Finance leases, gross	729	416
Accumulated amortization of finance leases	178	141
Capitalized Interest Costs [Abstract]
Capitalized interest	20	17	31
Progress Energy | Nuclear fuel
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Nuclear fuel	1,325	1,447
Accumulated depreciation and amortization	(735)	(822)
Progress Energy | Regulated
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Accumulated depreciation and amortization	(19,214)	(18,368)
Progress Energy | Regulated | Electric generation, distribution and transmission
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Plant - transmission and distribution	53,447	50,785
Progress Energy | Regulated | Other buildings and improvements
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Other buildings and improvements	514	459
Duke Energy Progress
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Land	482	463
Other buildings and improvements	1,115	1,070
Equipment	497	498
Construction in process	954	709
Total property, plant and equipment	37,018	35,759
Facilities to be retired, net	26	29
Total net property, plant and equipment	23,657	22,987
Finance leases, gross	627	297
Accumulated amortization of finance leases	45	24
Capitalized Interest Costs [Abstract]
Capitalized interest	14	12	28
Duke Energy Progress | Nuclear fuel
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Nuclear fuel	1,325	1,447
Accumulated depreciation and amortization	(735)	(822)
Duke Energy Progress | Regulated
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Accumulated depreciation and amortization	(13,387)	(12,801)
Duke Energy Progress | Regulated | Electric generation, distribution and transmission
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Plant - transmission and distribution	32,417	31,375
Duke Energy Progress | Regulated | Other buildings and improvements
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Other buildings and improvements	228	197
Duke Energy Florida
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Land	475	445
Other buildings and improvements	437	441
Equipment	294	261
Construction in process	1,343	1,304
Total property, plant and equipment	23,865	22,123
Total net property, plant and equipment	18,046	16,563
Finance leases, gross	102	119
Accumulated amortization of finance leases	133	117
Capitalized Interest Costs [Abstract]
Capitalized interest	6	5	3
Duke Energy Florida | Regulated
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Accumulated depreciation and amortization	(5,819)	(5,560)
Duke Energy Florida | Regulated | Electric generation, distribution and transmission
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Plant - transmission and distribution	21,030	19,410
Duke Energy Florida | Regulated | Other buildings and improvements
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Other buildings and improvements	286	262
Duke Energy Ohio
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Land	219	171
Other buildings and improvements	287	294
Equipment	403	385
Construction in process	515	407
Total property, plant and equipment	11,725	11,022
Facilities to be retired, net	6
Total net property, plant and equipment	8,625	8,009
Capitalized Interest Costs [Abstract]
Capitalized interest	20	26	22
Duke Energy Ohio | Regulated
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Accumulated depreciation and amortization	(3,106)	(3,013)
Duke Energy Ohio | Regulated | Electric generation, distribution and transmission
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Plant - transmission and distribution	6,573	6,255
Duke Energy Ohio | Regulated | Natural gas transmission and distribution
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Plant - transmission and distribution	3,347	3,136
Duke Energy Ohio | Regulated | Other buildings and improvements
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Other buildings and improvements	381	374
Duke Energy Indiana
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Land	122	118
Other buildings and improvements	253	309
Equipment	262	238
Construction in process	460	409
Total property, plant and equipment	17,343	17,382
Total net property, plant and equipment	11,760	11,721
Finance leases, gross	10	10
Accumulated amortization of finance leases	3	3
Capitalized Interest Costs [Abstract]
Capitalized interest	(17)	10	26
Duke Energy Indiana | PISCC Amortization
Capitalized Interest Costs [Abstract]
Capitalized interest	(24)
Duke Energy Indiana | Debt Component
Capitalized Interest Costs [Abstract]
Capitalized interest	7
Duke Energy Indiana | Regulated
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Accumulated depreciation and amortization	(5,583)	(5,661)
Duke Energy Indiana | Regulated | Electric generation, distribution and transmission
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Plant - transmission and distribution	15,925	16,008
Duke Energy Indiana | Regulated | Other buildings and improvements
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Other buildings and improvements	321	300
Piedmont
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Land	279	279
Other buildings and improvements	368	324
Equipment	122	122
Construction in process	262	581
Total property, plant and equipment	9,918	9,134
Facilities to be retired, net	11
Total net property, plant and equipment	8,030	7,385
Capitalized Interest Costs [Abstract]
Capitalized interest	9	8	$ 26
Piedmont | Regulated
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Accumulated depreciation and amortization	(1,899)	(1,749)
Piedmont | Regulated | Natural gas transmission and distribution
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Plant - transmission and distribution	8,732	7,663
Piedmont | Regulated | Other buildings and improvements
Public Utilities, Property, Plant and Equipment, Net [Abstract]
Other buildings and improvements	$ 155	$ 165

Property, Plant and Equipment_3

Property, Plant and Equipment (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Property, Plant and Equipment [Line Items]
Charges related to reduction in physical workspace	$ 192
Net property, plant and equipment	111,408	$ 106,782
Impairment of assets and other charges
Property, Plant and Equipment [Line Items]
Charges related to reduction in physical workspace	133
Operation, maintenance and other
Property, Plant and Equipment [Line Items]
Charges related to reduction in physical workspace	42
Depreciation and amortization
Property, Plant and Equipment [Line Items]
Charges related to reduction in physical workspace	17
Renewable merchant plants
Property, Plant and Equipment [Line Items]
Net property, plant and equipment	$ 200
Ownership interest	51.00%

Goodwill and Intangible Asset_2

Goodwill and Intangible Assets (Goodwill By Reportable Operating Segment) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Goodwill [Line Items]
Goodwill, gross	$ 19,425,000,000	$ 19,425,000,000
Accumulated impairment charges	(122,000,000)	(122,000,000)
Goodwill, net	19,303,000,000	19,303,000,000
Impairment charges	0
Electric Utilities and Infrastructure
Goodwill [Line Items]
Goodwill, gross	17,379,000,000	17,379,000,000
Goodwill, net	17,379,000,000	17,379,000,000
Gas Utilities and Infrastructure
Goodwill [Line Items]
Goodwill, gross	1,924,000,000	1,924,000,000
Goodwill, net	1,924,000,000	1,924,000,000
Commercial Renewables
Goodwill [Line Items]
Goodwill, gross	122,000,000	122,000,000
Accumulated impairment charges	$ (122,000,000)	$ (122,000,000)

Goodwill and Intangible Asset_3

Goodwill and Intangible Assets (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Goodwill [Line Items]
Goodwill	$ 19,303,000,000	$ 19,303,000,000
Goodwill accumulated impairment loss	122,000,000	122,000,000
Impairment charges	0
Electric Utilities and Infrastructure
Goodwill [Line Items]
Goodwill	17,379,000,000	17,379,000,000
Gas Utilities and Infrastructure
Goodwill [Line Items]
Goodwill	1,924,000,000	1,924,000,000
Duke Energy Ohio
Goodwill [Line Items]
Goodwill	920,000,000	920,000,000
Goodwill accumulated impairment loss	216,000,000	216,000,000
Duke Energy Ohio | Electric Utilities and Infrastructure
Goodwill [Line Items]
Goodwill	596,000,000	596,000,000
Duke Energy Ohio | Gas Utilities and Infrastructure
Goodwill [Line Items]
Goodwill	324,000,000	324,000,000
Progress Energy
Goodwill [Line Items]
Goodwill	3,655,000,000	3,655,000,000
Progress Energy | Electric Utilities and Infrastructure
Goodwill [Line Items]
Goodwill accumulated impairment loss	0
Piedmont
Goodwill [Line Items]
Goodwill	49,000,000	$ 49,000,000
Piedmont | Gas Utilities and Infrastructure
Goodwill [Line Items]
Goodwill accumulated impairment loss	$ 0

Goodwill and Intangible Asset_4

Goodwill and Intangible Assets (Schedule of Intangible Assets) (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Finite-Lived Intangible Assets, Net [Abstract]
Gross carrying amount	$ 370	$ 355
Accumulated amortization	(66)	(60)
Total intangible assets, net	304	295
Emission allowances
Finite-Lived Intangible Assets, Net [Abstract]
Gross carrying amount	8	8
Renewable energy certificates
Finite-Lived Intangible Assets, Net [Abstract]
Gross carrying amount	204	196
Natural gas, coal and power contracts
Finite-Lived Intangible Assets, Net [Abstract]
Gross carrying amount	24	24
Accumulated amortization	(24)	(23)
Renewable operating and development projects
Finite-Lived Intangible Assets, Net [Abstract]
Gross carrying amount	106	107
Accumulated amortization	(38)	(34)
Other
Finite-Lived Intangible Assets, Net [Abstract]
Gross carrying amount	28	20
Accumulated amortization	(4)	(3)
Duke Energy Carolinas
Finite-Lived Intangible Assets, Net [Abstract]
Gross carrying amount	73	65
Total intangible assets, net	73	65
Duke Energy Carolinas | Renewable energy certificates
Finite-Lived Intangible Assets, Net [Abstract]
Gross carrying amount	73	65
Progress Energy
Finite-Lived Intangible Assets, Net [Abstract]
Gross carrying amount	136	135
Total intangible assets, net	136	135
Progress Energy | Emission allowances
Finite-Lived Intangible Assets, Net [Abstract]
Gross carrying amount	5	5
Progress Energy | Renewable energy certificates
Finite-Lived Intangible Assets, Net [Abstract]
Gross carrying amount	131	130
Duke Energy Progress
Finite-Lived Intangible Assets, Net [Abstract]
Gross carrying amount	133	132
Total intangible assets, net	133	132
Duke Energy Progress | Emission allowances
Finite-Lived Intangible Assets, Net [Abstract]
Gross carrying amount	2	2
Duke Energy Progress | Renewable energy certificates
Finite-Lived Intangible Assets, Net [Abstract]
Gross carrying amount	131	130
Duke Energy Florida
Finite-Lived Intangible Assets, Net [Abstract]
Gross carrying amount	3	3
Total intangible assets, net	3	3
Duke Energy Florida | Emission allowances
Finite-Lived Intangible Assets, Net [Abstract]
Gross carrying amount	3	3
Duke Energy Ohio
Finite-Lived Intangible Assets, Net [Abstract]
Gross carrying amount		1
Total intangible assets, net		1
Duke Energy Ohio | Renewable energy certificates
Finite-Lived Intangible Assets, Net [Abstract]
Gross carrying amount		1
Duke Energy Indiana
Finite-Lived Intangible Assets, Net [Abstract]
Gross carrying amount	26	26
Accumulated amortization	(24)	(23)
Total intangible assets, net	2	3
Duke Energy Indiana | Emission allowances
Finite-Lived Intangible Assets, Net [Abstract]
Gross carrying amount	2	2
Duke Energy Indiana | Natural gas, coal and power contracts
Finite-Lived Intangible Assets, Net [Abstract]
Gross carrying amount	24	24
Accumulated amortization	$ (24)	$ (23)

Investments in Unconsolidated_3

Investments in Unconsolidated Affiliates (Investments in Equity Method Unconsolidated Affiliates) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Investments In Unconsolidated Affiliates [Line Items]
Investments	$ 970	$ 961
Equity in earnings (losses) of unconsolidated affiliates	28	(2,005)	$ 162
Electric Utilities and Infrastructure
Investments In Unconsolidated Affiliates [Line Items]
Investments	104	105
Equity in earnings (losses) of unconsolidated affiliates	7	(1)	9
Gas Utilities and Infrastructure
Investments In Unconsolidated Affiliates [Line Items]
Investments	231	215
Equity in earnings (losses) of unconsolidated affiliates	8	(2,017)	114
Commercial Renewables
Investments In Unconsolidated Affiliates [Line Items]
Investments	513	534
Equity in earnings (losses) of unconsolidated affiliates	(34)		(4)
Other
Investments In Unconsolidated Affiliates [Line Items]
Investments	122	107
Equity in earnings (losses) of unconsolidated affiliates	$ 47	$ 13	$ 43

Investments in Unconsolidated_4

Investments in Unconsolidated Affiliates (Narrative) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2021USD ($)	Dec. 31, 2020USD ($)assetMW	Dec. 31, 2019USD ($)
Investments In Unconsolidated Affiliates [Line Items]
Distributions from equity investments	$ 80	$ 37	$ 55
Distributions from equity investments, return of capital	$ 44	$ 133	11
Electric Utilities and Infrastructure | DATC
Investments In Unconsolidated Affiliates [Line Items]
Ownership interest	50.00%
Electric Utilities and Infrastructure | Pioneer
Investments In Unconsolidated Affiliates [Line Items]
Ownership interest	50.00%
Gas Utilities and Infrastructure | Sabal Trail
Investments In Unconsolidated Affiliates [Line Items]
Ownership interest	7.50%
Gas Utilities and Infrastructure | Constitution
Investments In Unconsolidated Affiliates [Line Items]
Ownership interest	24.00%
Impairment losses			$ 25
Gas Utilities and Infrastructure | ACP
Investments In Unconsolidated Affiliates [Line Items]
Ownership interest	47.00%
Gas Utilities and Infrastructure | SustainRNG
Investments In Unconsolidated Affiliates [Line Items]
Ownership interest	29.68%
Gas Utilities and Infrastructure | Sustain T&W
Investments In Unconsolidated Affiliates [Line Items]
Ownership interest	70.00%
Commercial Renewables | Non-consolidated VIEs
Investments In Unconsolidated Affiliates [Line Items]
Number of cell projects | asset		70
Capacity of assets | MW		43
Commercial Renewables | DS Cornerstone
Investments In Unconsolidated Affiliates [Line Items]
Ownership interest	26.00%		50.00%
Other | NMC
Investments In Unconsolidated Affiliates [Line Items]
Ownership interest	17.50%
Board representation and voting rights, ownership percentage	25.00%
Piedmont
Investments In Unconsolidated Affiliates [Line Items]
Distributions from equity investments	$ 8	$ 2	$ 1
Distributions from equity investments, return of capital	$ 2	$ 2	$ 4
Piedmont | Gas Utilities and Infrastructure | Cardinal
Investments In Unconsolidated Affiliates [Line Items]
Ownership interest	21.49%
Piedmont | Gas Utilities and Infrastructure | Pine Needle
Investments In Unconsolidated Affiliates [Line Items]
Ownership interest	45.00%
Piedmont | Gas Utilities and Infrastructure | Hardy Storage
Investments In Unconsolidated Affiliates [Line Items]
Ownership interest	50.00%

Investments in Unconsolidated_5

Investments in Unconsolidated Affiliates (Significant Subsidiaries) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Investments In Unconsolidated Affiliates [Line Items]
Current assets	$ 9,940	$ 8,682
Noncurrent assets	48,239	46,924
Current liabilities	15,931	16,305
Noncurrent liabilities	42,072	41,274
Membership interests	1,840	1,220
Operating loss	5,373	4,553	$ 5,709
Net income (loss)	3,579	1,082	3,571
Net (loss) income attributable to Duke Energy	$ 3,908	1,377	3,748
Atlantic Coast Pipeline (ACP) | Equity Method Investment, Nonconsolidated Investee or Group of Investees
Investments In Unconsolidated Affiliates [Line Items]
Current assets		43
Noncurrent assets		93
Current liabilities		1,965
Noncurrent liabilities		167
Membership interests		(1,996)
Operating loss		(4,612)	(5)
Net income (loss)		(4,512)	246
Net (loss) income attributable to Duke Energy		$ (2,121)	$ 116

Related Party Transactions (Oth

Related Party Transactions (Other Revenue and Expense) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Duke Energy Carolinas | Corporate governance and shared service expenses | Affiliated entity
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	$ 894	$ 753	$ 841
Duke Energy Carolinas | Indemnification coverages | Affiliated entity
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	24	20	20
Duke Energy Carolinas | Joint Dispatch Agreement (JDA) revenue | Duke Energy Progress
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	207	114	186
Related party transaction, other revenues from transactions with related party	41	25	60
Duke Energy Carolinas | Intercompany natural gas transactions | Affiliated entity
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	11	15	15
Progress Energy | Corporate governance and shared service expenses | Affiliated entity
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	856	715	778
Progress Energy | Indemnification coverages | Affiliated entity
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	41	36	37
Progress Energy | Joint Dispatch Agreement (JDA) revenue | Duke Energy Carolinas
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	41	25	60
Related party transaction, other revenues from transactions with related party	207	114	186
Progress Energy | Intercompany natural gas transactions | Affiliated entity
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	75	75	76
Duke Energy Progress | Corporate governance and shared service expenses | Affiliated entity
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	504	420	462
Duke Energy Progress | Indemnification coverages | Affiliated entity
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	19	17	15
Duke Energy Progress | Joint Dispatch Agreement (JDA) revenue | Duke Energy Carolinas
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	41	25	60
Related party transaction, other revenues from transactions with related party	207	114	186
Duke Energy Progress | Intercompany natural gas transactions | Affiliated entity
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	75	75	76
Duke Energy Florida | Corporate governance and shared service expenses | Affiliated entity
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	352	295	316
Duke Energy Florida | Indemnification coverages | Affiliated entity
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	22	19	22
Duke Energy Ohio | Corporate governance and shared service expenses | Affiliated entity
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	329	326	354
Duke Energy Ohio | Indemnification coverages | Affiliated entity
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	4	4	4
Duke Energy Indiana | Corporate governance and shared service expenses | Affiliated entity
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	409	401	412
Duke Energy Indiana | Indemnification coverages | Affiliated entity
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	8	8	7
Piedmont | Corporate governance and shared service expenses | Affiliated entity
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	139	140	138
Piedmont | Indemnification coverages | Affiliated entity
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	3	3	3
Piedmont | Intercompany natural gas transactions | Affiliated entity
Related Party Transaction [Line Items]
Related party transaction, other revenues from transactions with related party	86	90	91
Piedmont | Natural gas storage and transportation costs | Affiliated entity
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	$ 22	$ 23	$ 23

Related Party Transactions (Int

Related Party Transactions (Intercompany Income Taxes) (Details) - Affiliated entity - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Duke Energy Carolinas
Related Party Transaction [Line Items]
Intercompany income tax payable	$ 62	$ 31
Progress Energy
Related Party Transaction [Line Items]
Intercompany income tax payable		33
Duke Energy Progress
Related Party Transaction [Line Items]
Intercompany income tax payable	84	46
Duke Energy Florida
Related Party Transaction [Line Items]
Intercompany income tax receivable	40
Intercompany income tax payable		35
Duke Energy Ohio
Related Party Transaction [Line Items]
Intercompany income tax receivable	19
Intercompany income tax payable		2
Duke Energy Indiana
Related Party Transaction [Line Items]
Intercompany income tax receivable		9
Intercompany income tax payable	10
Piedmont
Related Party Transaction [Line Items]
Intercompany income tax receivable		$ 10
Intercompany income tax payable	$ 27

Derivatives and Hedging (Notion

Derivatives and Hedging (Notional Amounts of Derivative Instruments) (Details) Mcf in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2021USD ($)GWhMcf	Dec. 31, 2020USD ($)GWhMcf
Interest Rate Contracts
Derivative [Line Items]
Notional Amount	$ 3,592	$ 1,809
Interest Rate Contracts | Designated contracts | Cash flow hedges
Derivative [Line Items]
Notional Amount	2,415	632
Interest Rate Contracts | Undesignated contracts
Derivative [Line Items]
Notional Amount	$ 1,177	$ 1,177
Commodity contracts | Electricity (GWh)(a)
Derivative [Line Items]
Notional amount, energy measure, in gigawatt-hours | GWh	22,344	35,409
Commodity contracts | Electricity (GWh)(a) | Cash flow hedges
Derivative [Line Items]
Notional amount, energy measure, in gigawatt-hours | GWh	9,975	22,048
Commodity contracts | Natural gas (millions of Dth)
Derivative [Line Items]
Notional amount, volume in millions of dekatherms | Mcf	823	678
Consolidated VIEs | Interest Rate Contracts | Designated contracts | Cash flow hedges
Derivative [Line Items]
Notional Amount	$ 665	$ 632
Duke Energy Carolinas | Interest Rate Contracts
Derivative [Line Items]
Notional Amount	350	400
Duke Energy Carolinas | Interest Rate Contracts | Undesignated contracts
Derivative [Line Items]
Notional Amount	$ 350	$ 400
Duke Energy Carolinas | Commodity contracts | Natural gas (millions of Dth)
Derivative [Line Items]
Notional amount, volume in millions of dekatherms | Mcf	264	145
Progress Energy | Interest Rate Contracts
Derivative [Line Items]
Notional Amount	$ 500	$ 750
Progress Energy | Interest Rate Contracts | Undesignated contracts
Derivative [Line Items]
Notional Amount	$ 500	$ 750
Progress Energy | Commodity contracts | Natural gas (millions of Dth)
Derivative [Line Items]
Notional amount, volume in millions of dekatherms | Mcf	215	158
Duke Energy Progress | Interest Rate Contracts
Derivative [Line Items]
Notional Amount	$ 500	$ 750
Duke Energy Progress | Interest Rate Contracts | Undesignated contracts
Derivative [Line Items]
Notional Amount	$ 500	$ 750
Duke Energy Progress | Commodity contracts | Natural gas (millions of Dth)
Derivative [Line Items]
Notional amount, volume in millions of dekatherms | Mcf	215	158
Duke Energy Ohio | Interest Rate Contracts
Derivative [Line Items]
Notional Amount	$ 27	$ 27
Duke Energy Ohio | Interest Rate Contracts | Undesignated contracts
Derivative [Line Items]
Notional Amount	$ 27	$ 27
Duke Energy Ohio | Commodity contracts | Electricity (GWh)(a)
Derivative [Line Items]
Notional amount, energy measure, in gigawatt-hours | GWh	1,681	2,559
Duke Energy Indiana | Interest Rate Contracts
Derivative [Line Items]
Notional Amount	$ 300
Duke Energy Indiana | Interest Rate Contracts | Undesignated contracts
Derivative [Line Items]
Notional Amount	$ 300
Duke Energy Indiana | Commodity contracts | Electricity (GWh)(a)
Derivative [Line Items]
Notional amount, energy measure, in gigawatt-hours | GWh	10,688	10,802
Duke Energy Indiana | Commodity contracts | Natural gas (millions of Dth)
Derivative [Line Items]
Notional amount, volume in millions of dekatherms | Mcf	8	2
Piedmont | Commodity contracts | Natural gas (millions of Dth)
Derivative [Line Items]
Notional amount, volume in millions of dekatherms | Mcf	336	373

Derivatives and Hedging (Locati

Derivatives and Hedging (Location and Fair Value Amounts of Derivatives Reflected in the Consolidated Balance Sheets) (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives assets	$ 320	$ 61
Location and fair value amounts of derivatives liabilities	472	324
Current Assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives assets	204	48
Noncurrent assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives assets	116	13
Current Liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives liabilities	184	64
Noncurrent Liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives liabilities	288	260
Commodity Contracts
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives assets	312	43
Location and fair value amounts of derivatives liabilities	348	251
Interest Rate Contracts
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives assets	8	18
Location and fair value amounts of derivatives liabilities	124	73
Designated as Hedging Instruments | Commodity Contracts | Current Liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives liabilities	27	14
Designated as Hedging Instruments | Commodity Contracts | Noncurrent Liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives liabilities	117	70
Designated as Hedging Instruments | Interest Rate Contracts | Current Assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives assets	3
Designated as Hedging Instruments | Interest Rate Contracts | Noncurrent assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives assets	3
Designated as Hedging Instruments | Interest Rate Contracts | Current Liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives liabilities	75	15
Designated as Hedging Instruments | Interest Rate Contracts | Noncurrent Liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives liabilities	21	48
Not Designated as Hedging Instruments | Commodity Contracts | Current Assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives assets	199	30
Not Designated as Hedging Instruments | Commodity Contracts | Noncurrent assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives assets	113	13
Not Designated as Hedging Instruments | Commodity Contracts | Current Liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives liabilities	72	30
Not Designated as Hedging Instruments | Commodity Contracts | Noncurrent Liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives liabilities	132	137
Not Designated as Hedging Instruments | Interest Rate Contracts | Current Assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives assets	2	18
Not Designated as Hedging Instruments | Interest Rate Contracts | Current Liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives liabilities	10	5
Not Designated as Hedging Instruments | Interest Rate Contracts | Noncurrent Liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives liabilities	18	5
Duke Energy Carolinas
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives assets	162	20
Location and fair value amounts of derivatives liabilities	35	20
Duke Energy Carolinas | Current Assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives assets	99	14
Duke Energy Carolinas | Noncurrent assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives assets	63	6
Duke Energy Carolinas | Current Liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives liabilities	26	17
Duke Energy Carolinas | Noncurrent Liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives liabilities	9	3
Duke Energy Carolinas | Commodity Contracts
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives assets	162	20
Location and fair value amounts of derivatives liabilities	27	16
Duke Energy Carolinas | Interest Rate Contracts
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives liabilities	8	4
Duke Energy Carolinas | Not Designated as Hedging Instruments | Commodity Contracts | Current Assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives assets	99	14
Duke Energy Carolinas | Not Designated as Hedging Instruments | Commodity Contracts | Noncurrent assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives assets	63	6
Duke Energy Carolinas | Not Designated as Hedging Instruments | Commodity Contracts | Current Liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives liabilities	18	13
Duke Energy Carolinas | Not Designated as Hedging Instruments | Commodity Contracts | Noncurrent Liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives liabilities	9	3
Duke Energy Carolinas | Not Designated as Hedging Instruments | Interest Rate Contracts | Current Liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives liabilities	8	4
Progress Energy
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives assets	124	33
Location and fair value amounts of derivatives liabilities	24	29
Progress Energy | Current Assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives assets	74	27
Progress Energy | Noncurrent assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives assets	50	6
Progress Energy | Current Liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives liabilities	19	2
Progress Energy | Noncurrent Liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives liabilities	5	27
Progress Energy | Commodity Contracts
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives assets	122	15
Location and fair value amounts of derivatives liabilities	24	29
Progress Energy | Interest Rate Contracts
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives assets	2	18
Progress Energy | Not Designated as Hedging Instruments | Commodity Contracts | Current Assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives assets	72	9
Progress Energy | Not Designated as Hedging Instruments | Commodity Contracts | Noncurrent assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives assets	50	6
Progress Energy | Not Designated as Hedging Instruments | Commodity Contracts | Current Liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives liabilities	19	2
Progress Energy | Not Designated as Hedging Instruments | Commodity Contracts | Noncurrent Liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives liabilities	5	27
Progress Energy | Not Designated as Hedging Instruments | Interest Rate Contracts | Current Assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives assets	2	18
Duke Energy Progress
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives assets	124	33
Location and fair value amounts of derivatives liabilities	10	14
Duke Energy Progress | Current Assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives assets	74	27
Duke Energy Progress | Noncurrent assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives assets	50	6
Duke Energy Progress | Current Liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives liabilities	5	2
Duke Energy Progress | Noncurrent Liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives liabilities	5	12
Duke Energy Progress | Commodity Contracts
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives assets	122	15
Location and fair value amounts of derivatives liabilities	10	14
Duke Energy Progress | Interest Rate Contracts
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives assets	2	18
Duke Energy Progress | Not Designated as Hedging Instruments | Commodity Contracts | Current Assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives assets	72	9
Duke Energy Progress | Not Designated as Hedging Instruments | Commodity Contracts | Noncurrent assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives assets	50	6
Duke Energy Progress | Not Designated as Hedging Instruments | Commodity Contracts | Current Liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives liabilities	5	2
Duke Energy Progress | Not Designated as Hedging Instruments | Commodity Contracts | Noncurrent Liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives liabilities	5	12
Duke Energy Progress | Not Designated as Hedging Instruments | Interest Rate Contracts | Current Assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives assets	2	18
Duke Energy Florida
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives liabilities	14
Duke Energy Florida | Current Liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives liabilities	14
Duke Energy Florida | Commodity Contracts
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives liabilities	14
Duke Energy Florida | Not Designated as Hedging Instruments | Commodity Contracts | Current Liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives liabilities	14
Duke Energy Ohio
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives assets	2	1
Location and fair value amounts of derivatives liabilities	5	6
Duke Energy Ohio | Current Assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives assets	2	1
Duke Energy Ohio | Current Liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives liabilities	1	1
Duke Energy Ohio | Noncurrent Liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives liabilities	4	5
Duke Energy Ohio | Commodity Contracts
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives assets	2	1
Duke Energy Ohio | Interest Rate Contracts
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives liabilities	5	6
Duke Energy Ohio | Not Designated as Hedging Instruments | Commodity Contracts | Current Assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives assets	2	1
Duke Energy Ohio | Not Designated as Hedging Instruments | Interest Rate Contracts | Current Liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives liabilities	1	1
Duke Energy Ohio | Not Designated as Hedging Instruments | Interest Rate Contracts | Noncurrent Liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives liabilities	4	5
Duke Energy Indiana
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives assets	23	6
Location and fair value amounts of derivatives liabilities	27	1
Duke Energy Indiana | Current Assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives assets	23	6
Duke Energy Indiana | Current Liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives liabilities	13	1
Duke Energy Indiana | Noncurrent Liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives liabilities	14
Duke Energy Indiana | Commodity Contracts
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives assets	23	6
Location and fair value amounts of derivatives liabilities	13	1
Duke Energy Indiana | Interest Rate Contracts
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives liabilities	14
Duke Energy Indiana | Not Designated as Hedging Instruments | Commodity Contracts | Current Assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives assets	23	6
Duke Energy Indiana | Not Designated as Hedging Instruments | Commodity Contracts | Current Liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives liabilities	13	1
Duke Energy Indiana | Not Designated as Hedging Instruments | Interest Rate Contracts | Noncurrent Liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives liabilities	14
Piedmont
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives assets	3	1
Location and fair value amounts of derivatives liabilities	139	122
Piedmont | Current Assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives assets	3	1
Piedmont | Current Liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives liabilities	21	15
Piedmont | Noncurrent Liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives liabilities	118	107
Piedmont | Commodity Contracts
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives assets	3	1
Location and fair value amounts of derivatives liabilities	139	122
Piedmont | Not Designated as Hedging Instruments | Commodity Contracts | Current Assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives assets	3	1
Piedmont | Not Designated as Hedging Instruments | Commodity Contracts | Current Liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives liabilities	21	15
Piedmont | Not Designated as Hedging Instruments | Commodity Contracts | Noncurrent Liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives liabilities	$ 118	$ 107

Derivatives and Hedging (Schedu

Derivatives and Hedging (Schedule of Offsetting Assets) (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Offsetting Assets [Line Items]
Gross amounts recognized	$ 320	$ 61
Net amounts presented on Balance Sheets	320	61
Current Assets
Offsetting Assets [Line Items]
Gross amounts recognized	204	48
Gross amounts offset	(25)	(3)
Net amounts presented on Balance Sheets	179	45
Noncurrent assets
Offsetting Assets [Line Items]
Gross amounts recognized	116	13
Gross amounts offset	(23)	(5)
Net amounts presented on Balance Sheets	93	8
Duke Energy Carolinas
Offsetting Assets [Line Items]
Gross amounts recognized	162	20
Net amounts presented on Balance Sheets	162	20
Duke Energy Carolinas | Current Assets
Offsetting Assets [Line Items]
Gross amounts recognized	99	14
Gross amounts offset	(16)	(2)
Net amounts presented on Balance Sheets	83	12
Duke Energy Carolinas | Noncurrent assets
Offsetting Assets [Line Items]
Gross amounts recognized	63	6
Gross amounts offset	(15)	(1)
Net amounts presented on Balance Sheets	48	5
Progress Energy
Offsetting Assets [Line Items]
Gross amounts recognized	124	33
Net amounts presented on Balance Sheets	124	33
Progress Energy | Current Assets
Offsetting Assets [Line Items]
Gross amounts recognized	74	27
Gross amounts offset	(9)	(2)
Net amounts presented on Balance Sheets	65	25
Progress Energy | Noncurrent assets
Offsetting Assets [Line Items]
Gross amounts recognized	50	6
Gross amounts offset	(8)	(4)
Net amounts presented on Balance Sheets	42	2
Duke Energy Progress
Offsetting Assets [Line Items]
Gross amounts recognized	124	33
Net amounts presented on Balance Sheets	124	33
Duke Energy Progress | Current Assets
Offsetting Assets [Line Items]
Gross amounts recognized	74	27
Gross amounts offset	(9)	(2)
Net amounts presented on Balance Sheets	65	25
Duke Energy Progress | Noncurrent assets
Offsetting Assets [Line Items]
Gross amounts recognized	50	6
Gross amounts offset	(8)	(4)
Net amounts presented on Balance Sheets	42	2
Duke Energy Ohio
Offsetting Assets [Line Items]
Gross amounts recognized	2	1
Duke Energy Ohio | Current Assets
Offsetting Assets [Line Items]
Gross amounts recognized	2	1
Net amounts presented on Balance Sheets	2	1
Duke Energy Indiana
Offsetting Assets [Line Items]
Gross amounts recognized	23	6
Net amounts presented on Balance Sheets	23	6
Duke Energy Indiana | Current Assets
Offsetting Assets [Line Items]
Gross amounts recognized	23	6
Net amounts presented on Balance Sheets	23	6
Piedmont
Offsetting Assets [Line Items]
Gross amounts recognized	3	1
Net amounts presented on Balance Sheets	3	1
Piedmont | Current Assets
Offsetting Assets [Line Items]
Gross amounts recognized	3	1
Net amounts presented on Balance Sheets	$ 3	$ 1

Derivatives and Hedging (Sche_2

Derivatives and Hedging (Schedule of Offsetting Liabilities) (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Offsetting Liabilities [Line Items]
Gross amounts recognized	$ 472	$ 324
Net amounts presented on Balance Sheets	472	324
Current Liabilities
Offsetting Liabilities [Line Items]
Gross amounts recognized	184	64
Gross amounts offset	(11)	(3)
Net amounts presented on Balance Sheets	173	61
Noncurrent Liabilities
Offsetting Liabilities [Line Items]
Gross amounts recognized	288	260
Gross amounts offset	(12)	(5)
Net amounts presented on Balance Sheets	276	255
Duke Energy Carolinas
Offsetting Liabilities [Line Items]
Gross amounts recognized	35	20
Net amounts presented on Balance Sheets	35	20
Duke Energy Carolinas | Current Liabilities
Offsetting Liabilities [Line Items]
Gross amounts recognized	26	17
Gross amounts offset	(6)	(2)
Net amounts presented on Balance Sheets	20	15
Duke Energy Carolinas | Noncurrent Liabilities
Offsetting Liabilities [Line Items]
Gross amounts recognized	9	3
Gross amounts offset	(8)	(1)
Net amounts presented on Balance Sheets	1	2
Progress Energy
Offsetting Liabilities [Line Items]
Gross amounts recognized	24	29
Net amounts presented on Balance Sheets	24	29
Progress Energy | Current Liabilities
Offsetting Liabilities [Line Items]
Gross amounts recognized	19	2
Gross amounts offset	(5)	(2)
Net amounts presented on Balance Sheets	14
Progress Energy | Noncurrent Liabilities
Offsetting Liabilities [Line Items]
Gross amounts recognized	5	27
Gross amounts offset	(5)	(4)
Net amounts presented on Balance Sheets		23
Duke Energy Progress
Offsetting Liabilities [Line Items]
Gross amounts recognized	10	14
Net amounts presented on Balance Sheets	10	14
Duke Energy Progress | Current Liabilities
Offsetting Liabilities [Line Items]
Gross amounts recognized	5	2
Gross amounts offset	(5)	(2)
Duke Energy Progress | Noncurrent Liabilities
Offsetting Liabilities [Line Items]
Gross amounts recognized	5	12
Gross amounts offset	(5)	(4)
Net amounts presented on Balance Sheets		8
Duke Energy Florida
Offsetting Liabilities [Line Items]
Gross amounts recognized	14
Net amounts presented on Balance Sheets	14
Duke Energy Florida | Current Liabilities
Offsetting Liabilities [Line Items]
Gross amounts recognized	14
Net amounts presented on Balance Sheets	14
Duke Energy Ohio
Offsetting Liabilities [Line Items]
Gross amounts recognized	5	6
Duke Energy Ohio | Current Liabilities
Offsetting Liabilities [Line Items]
Gross amounts recognized	1	1
Net amounts presented on Balance Sheets	1	1
Duke Energy Ohio | Noncurrent Liabilities
Offsetting Liabilities [Line Items]
Gross amounts recognized	4	5
Net amounts presented on Balance Sheets	4	5
Duke Energy Indiana
Offsetting Liabilities [Line Items]
Gross amounts recognized	27	1
Net amounts presented on Balance Sheets	27	1
Duke Energy Indiana | Current Liabilities
Offsetting Liabilities [Line Items]
Gross amounts recognized	13	1
Net amounts presented on Balance Sheets	13	1
Duke Energy Indiana | Noncurrent Liabilities
Offsetting Liabilities [Line Items]
Gross amounts recognized	14
Net amounts presented on Balance Sheets	14
Piedmont
Offsetting Liabilities [Line Items]
Gross amounts recognized	139	122
Net amounts presented on Balance Sheets	139	122
Piedmont | Current Liabilities
Offsetting Liabilities [Line Items]
Gross amounts recognized	21	15
Net amounts presented on Balance Sheets	21	15
Piedmont | Noncurrent Liabilities
Offsetting Liabilities [Line Items]
Gross amounts recognized	118	107
Net amounts presented on Balance Sheets	$ 118	$ 107

Investments in Debt and Equit_3

Investments in Debt and Equity Securities (Estimated Fair Value of Investments in Debt and Equity Securities) (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Debt Securities, Available-for-sale
Estimated Fair Value	$ 3,191
Total Investments
Unrealized Holding Gains	5,033	$ 4,387
Unrealized Holding Losses	66	55
Estimated Fair Value	10,893	9,687
NDTF
Equity Securities, FV-NI
Gross Unrealized Holding Gains	4,905	4,138
Gross Unrealized Holding Losses	43	54
Estimated Fair Value	7,350	6,235
Debt Securities, Available-for-sale
Estimated Fair Value	2,891	2,717
Total Investments
Unrealized Holding Gains	4,992	4,295
Unrealized Holding Losses	63	55
Estimated Fair Value	10,401	9,129
NDTF | Cash and cash equivalents
Available-for-sale Securities
Cash and cash equivalents	160	177
NDTF | Corporate debt securities
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	39	76
Gross Unrealized Holding Losses	6	1
Estimated Fair Value	829	806
NDTF | Municipal bonds
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	14	22
Gross Unrealized Holding Losses	1
Estimated Fair Value	314	370
NDTF | U.S. government bonds
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	31	51
Gross Unrealized Holding Losses	12
Estimated Fair Value	1,568	1,361
NDTF | Other debt securities
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	3	8
Gross Unrealized Holding Losses	1
Estimated Fair Value	180	180
Other Investments
Equity Securities, FV-NI
Gross Unrealized Holding Gains	36	79
Estimated Fair Value	156	146
Debt Securities, Available-for-sale
Estimated Fair Value	300	285
Total Investments
Unrealized Holding Gains	41	92
Unrealized Holding Losses	3
Estimated Fair Value	492	558
Other Investments | Cash and cash equivalents
Available-for-sale Securities
Cash and cash equivalents	36	127
Other Investments | Corporate debt securities
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	2	8
Gross Unrealized Holding Losses	1
Estimated Fair Value	119	110
Other Investments | Municipal bonds
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	3	5
Gross Unrealized Holding Losses	1
Estimated Fair Value	80	86
Other Investments | U.S. government bonds
Debt Securities, Available-for-sale
Estimated Fair Value	56	42
Other Investments | Other debt securities
Debt Securities, Available-for-sale
Gross Unrealized Holding Losses	1
Estimated Fair Value	45	47
Duke Energy Carolinas
Debt Securities, Available-for-sale
Estimated Fair Value	1,441
Duke Energy Carolinas | NDTF
Equity Securities, FV-NI
Gross Unrealized Holding Gains	2,887	2,442
Gross Unrealized Holding Losses	19	23
Estimated Fair Value	4,265	3,685
Debt Securities, Available-for-sale
Estimated Fair Value	1,441	1,250
Total Investments
Unrealized Holding Gains	2,932	2,529
Unrealized Holding Losses	27	24
Estimated Fair Value	5,759	4,965
Duke Energy Carolinas | NDTF | Cash and cash equivalents
Available-for-sale Securities
Cash and cash equivalents	53	30
Duke Energy Carolinas | NDTF | Corporate debt securities
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	24	49
Gross Unrealized Holding Losses	4	1
Estimated Fair Value	506	510
Duke Energy Carolinas | NDTF | Municipal bonds
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	2	6
Estimated Fair Value	48	91
Duke Energy Carolinas | NDTF | U.S. government bonds
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	16	25
Gross Unrealized Holding Losses	3
Estimated Fair Value	712	475
Duke Energy Carolinas | NDTF | Other debt securities
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	3	7
Gross Unrealized Holding Losses	1
Estimated Fair Value	175	174
Progress Energy
Debt Securities, Available-for-sale
Estimated Fair Value	1,476
Total Investments
Unrealized Holding Gains	2,062	1,769
Unrealized Holding Losses	36	31
Estimated Fair Value	4,688	4,296
Progress Energy | NDTF
Equity Securities, FV-NI
Gross Unrealized Holding Gains	2,018	1,696
Gross Unrealized Holding Losses	24	31
Estimated Fair Value	3,085	2,550
Debt Securities, Available-for-sale
Estimated Fair Value	1,450	1,467
Total Investments
Unrealized Holding Gains	2,060	1,766
Unrealized Holding Losses	36	31
Estimated Fair Value	4,642	4,164
Progress Energy | NDTF | Cash and cash equivalents
Available-for-sale Securities
Cash and cash equivalents	107	147
Progress Energy | NDTF | Corporate debt securities
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	15	27
Gross Unrealized Holding Losses	2
Estimated Fair Value	323	296
Progress Energy | NDTF | Municipal bonds
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	12	16
Gross Unrealized Holding Losses	1
Estimated Fair Value	266	279
Progress Energy | NDTF | U.S. government bonds
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	15	26
Gross Unrealized Holding Losses	9
Estimated Fair Value	856	886
Progress Energy | NDTF | Other debt securities
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains		1
Estimated Fair Value	5	6
Progress Energy | Other Investments
Debt Securities, Available-for-sale
Estimated Fair Value	26	26
Total Investments
Unrealized Holding Gains	2	3
Estimated Fair Value	46	132
Progress Energy | Other Investments | Cash and cash equivalents
Available-for-sale Securities
Cash and cash equivalents	20	106
Progress Energy | Other Investments | Municipal bonds
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	2	3
Estimated Fair Value	26	26
Duke Energy Progress
Debt Securities, Available-for-sale
Estimated Fair Value	1,025
Total Investments
Unrealized Holding Gains	1,957	1,687
Unrealized Holding Losses	29	31
Estimated Fair Value	4,105	3,529
Duke Energy Progress | NDTF
Equity Securities, FV-NI
Gross Unrealized Holding Gains	1,915	1,617
Gross Unrealized Holding Losses	23	31
Estimated Fair Value	2,970	2,459
Debt Securities, Available-for-sale
Estimated Fair Value	1,025	993
Total Investments
Unrealized Holding Gains	1,957	1,687
Unrealized Holding Losses	29	31
Estimated Fair Value	4,089	3,528
Duke Energy Progress | NDTF | Cash and cash equivalents
Available-for-sale Securities
Cash and cash equivalents	94	76
Duke Energy Progress | NDTF | Corporate debt securities
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	15	27
Gross Unrealized Holding Losses	2
Estimated Fair Value	282	296
Duke Energy Progress | NDTF | Municipal bonds
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	12	16
Gross Unrealized Holding Losses	1
Estimated Fair Value	266	279
Duke Energy Progress | NDTF | U.S. government bonds
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	15	26
Gross Unrealized Holding Losses	3
Estimated Fair Value	472	412
Duke Energy Progress | NDTF | Other debt securities
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains		1
Estimated Fair Value	5	6
Duke Energy Progress | Other Investments
Total Investments
Estimated Fair Value	16	1
Duke Energy Progress | Other Investments | Cash and cash equivalents
Available-for-sale Securities
Cash and cash equivalents	16	1
Duke Energy Florida
Debt Securities, Available-for-sale
Estimated Fair Value	451
Total Investments
Unrealized Holding Gains	105	82
Unrealized Holding Losses	7
Estimated Fair Value	582	663
Duke Energy Florida | NDTF
Equity Securities, FV-NI
Gross Unrealized Holding Gains	103	79
Gross Unrealized Holding Losses	1
Estimated Fair Value	115	91
Debt Securities, Available-for-sale
Estimated Fair Value	425	474
Total Investments
Unrealized Holding Gains	103	79
Unrealized Holding Losses	7
Estimated Fair Value	553	636
Duke Energy Florida | NDTF | Cash and cash equivalents
Available-for-sale Securities
Cash and cash equivalents	13	71
Duke Energy Florida | NDTF | Corporate debt securities
Debt Securities, Available-for-sale
Estimated Fair Value	41
Duke Energy Florida | NDTF | U.S. government bonds
Debt Securities, Available-for-sale
Gross Unrealized Holding Losses	6
Estimated Fair Value	384	474
Duke Energy Florida | Other Investments
Debt Securities, Available-for-sale
Estimated Fair Value	26	26
Total Investments
Unrealized Holding Gains	2	3
Estimated Fair Value	29	27
Duke Energy Florida | Other Investments | Cash and cash equivalents
Available-for-sale Securities
Cash and cash equivalents	3	1
Duke Energy Florida | Other Investments | Municipal bonds
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	2	3
Estimated Fair Value	26	26
Duke Energy Indiana
Debt Securities, Available-for-sale
Estimated Fair Value	64
Total Investments
Unrealized Holding Gains	7	59
Unrealized Holding Losses	1
Estimated Fair Value	161	143
Duke Energy Indiana | Other Investments
Available-for-sale Securities
Cash and cash equivalents		1
Equity Securities, FV-NI
Gross Unrealized Holding Gains	6	58
Estimated Fair Value	97	97
Debt Securities, Available-for-sale
Estimated Fair Value	64	45
Duke Energy Indiana | Other Investments | Corporate debt securities
Debt Securities, Available-for-sale
Estimated Fair Value	6	3
Duke Energy Indiana | Other Investments | Municipal bonds
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	1	1
Gross Unrealized Holding Losses	1
Estimated Fair Value	46	38
Duke Energy Indiana | Other Investments | U.S. government bonds
Debt Securities, Available-for-sale
Estimated Fair Value	$ 12	$ 4

Investments in Debt and Equit_4

Investments in Debt and Equity Securities (Maturities) (Details) $ in Millions	Dec. 31, 2021USD ($)
Debt Securities, Available-for-sale [Line Items]
Due in one year or less	$ 159
Due after one through five years	957
Due after five through 10 years	550
Due after 10 years	1,525
Total	3,191
Duke Energy Carolinas
Debt Securities, Available-for-sale [Line Items]
Due in one year or less	3
Due after one through five years	337
Due after five through 10 years	226
Due after 10 years	875
Total	1,441
Progress Energy
Debt Securities, Available-for-sale [Line Items]
Due in one year or less	138
Due after one through five years	546
Due after five through 10 years	248
Due after 10 years	544
Total	1,476
Duke Energy Progress
Debt Securities, Available-for-sale [Line Items]
Due in one year or less	31
Due after one through five years	256
Due after five through 10 years	231
Due after 10 years	507
Total	1,025
Duke Energy Florida
Debt Securities, Available-for-sale [Line Items]
Due in one year or less	107
Due after one through five years	290
Due after five through 10 years	17
Due after 10 years	37
Total	451
Duke Energy Indiana
Debt Securities, Available-for-sale [Line Items]
Due in one year or less	7
Due after one through five years	25
Due after five through 10 years	10
Due after 10 years	22
Total	$ 64

Investments in Debt and Equit_5

Investments in Debt and Equity Securities (Realized Gains and Losses) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
FV-NI:
Realized gains	$ 724	$ 366	$ 172
Realized losses	141	174	151
AFS:
Realized gains	56	96	94
Realized losses	54	51	67
Duke Energy Carolinas
FV-NI:
Realized gains	440	64	113
Realized losses	96	99	107
AFS:
Realized gains	38	60	55
Realized losses	37	37	38
Progress Energy
FV-NI:
Realized gains	284	302	59
Realized losses	45	75	44
AFS:
Realized gains	16	24	36
Realized losses	14	13	29
Duke Energy Progress
FV-NI:
Realized gains	283	52	38
Realized losses	44	59	33
AFS:
Realized gains	15	24	7
Realized losses	13	13	5
Duke Energy Florida
FV-NI:
Realized gains	1	250	21
Realized losses	1	$ 16	11
AFS:
Realized gains	1		29
Realized losses	$ 1		$ 24

Fair Value Measurements (Fair V

Fair Value Measurements (Fair Value Measurement Amounts for Assets and Liabilities) (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt securities, available-for-sale	$ 3,191
Derivative assets	320	$ 61
Total assets	11,213	9,748
Derivative liabilities	(472)	(324)
Net assets (liabilities)	10,741	9,424
Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative assets	3	1
Total assets	8,667	7,551
Derivative liabilities	(13)
Net assets (liabilities)	8,654	7,551
Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative assets	293	53
Total assets	2,472	2,144
Derivative liabilities	(314)	(240)
Net assets (liabilities)	2,158	1,904
Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative assets	24	7
Total assets	24	7
Derivative liabilities	(145)	(84)
Net assets (liabilities)	(121)	(77)
Not Categorized
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total assets	50	46
Net assets (liabilities)	50	46
NDTF
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	160	177
Equity securities, FV-NI	7,350	6,235
Debt securities, available-for-sale	2,891	2,717
NDTF | Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	160	177
Debt securities, available-for-sale	967	874
NDTF | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt securities, available-for-sale	1,924	1,843
NDTF equity securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity securities, FV-NI	7,350	6,235
NDTF equity securities | Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity securities, FV-NI	7,300	6,189
NDTF equity securities | Not Categorized
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity securities, FV-NI	50	46
Other Investments
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity securities, FV-NI	156	146
Debt securities, available-for-sale	300	285
Other Investments | Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity securities, FV-NI	156	146
Debt securities, available-for-sale	45	37
Other Investments | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt securities, available-for-sale	255	248
Other cash and cash equivalents
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	36	127
Other cash and cash equivalents | Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	36	127
Duke Energy Carolinas
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt securities, available-for-sale	1,441
Derivative assets	162	20
Total assets	5,921	4,985
Derivative liabilities	(35)	(20)
Net assets (liabilities)	5,886	4,965
Duke Energy Carolinas | Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total assets	4,607	3,861
Net assets (liabilities)	4,607	3,861
Duke Energy Carolinas | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative assets	162	20
Total assets	1,264	1,078
Derivative liabilities	(35)	(20)
Net assets (liabilities)	1,229	1,058
Duke Energy Carolinas | Not Categorized
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total assets	50	46
Net assets (liabilities)	50	46
Duke Energy Carolinas | NDTF
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	53	30
Equity securities, FV-NI	4,265	3,685
Debt securities, available-for-sale	1,441	1,250
Duke Energy Carolinas | NDTF | Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	53	30
Equity securities, FV-NI		3,639
Debt securities, available-for-sale	339	192
Duke Energy Carolinas | NDTF | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt securities, available-for-sale	1,102	1,058
Duke Energy Carolinas | NDTF | Not Categorized
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity securities, FV-NI		46
Duke Energy Carolinas | NDTF equity securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity securities, FV-NI	4,265
Duke Energy Carolinas | NDTF equity securities | Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity securities, FV-NI	4,215
Duke Energy Carolinas | NDTF equity securities | Not Categorized
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity securities, FV-NI	50
Progress Energy
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt securities, available-for-sale	1,476
Derivative assets	124	33
Total assets	4,812	4,329
Derivative liabilities	(24)	(29)
Net assets (liabilities)	4,788	4,300
Progress Energy | Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total assets	3,840	3,485
Net assets (liabilities)	3,840	3,485
Progress Energy | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative assets	124	33
Total assets	972	844
Derivative liabilities	(24)	(29)
Net assets (liabilities)	948	815
Progress Energy | NDTF
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	107	147
Equity securities, FV-NI	3,085	2,550
Debt securities, available-for-sale	1,450	1,467
Progress Energy | NDTF | Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	107	147
Debt securities, available-for-sale	628	682
Progress Energy | NDTF | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt securities, available-for-sale	822	785
Progress Energy | NDTF equity securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity securities, FV-NI	3,085	2,550
Progress Energy | NDTF equity securities | Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity securities, FV-NI	3,085	2,550
Progress Energy | Other Investments
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt securities, available-for-sale	26	26
Progress Energy | Other Investments | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt securities, available-for-sale	26	26
Progress Energy | Other cash and cash equivalents
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	20	106
Progress Energy | Other cash and cash equivalents | Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	20	106
Duke Energy Progress
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt securities, available-for-sale	1,025
Derivative assets	124	33
Total assets	4,229	3,562
Derivative liabilities	(10)	(14)
Net assets (liabilities)	4,219	3,548
Duke Energy Progress | Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total assets	3,369	2,773
Net assets (liabilities)	3,369	2,773
Duke Energy Progress | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative assets	124	33
Total assets	860	789
Derivative liabilities	(10)	(14)
Net assets (liabilities)	850	775
Duke Energy Progress | NDTF
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	94	76
Equity securities, FV-NI	2,970	2,459
Debt securities, available-for-sale	1,025	993
Duke Energy Progress | NDTF | Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	94	76
Debt securities, available-for-sale	289	237
Duke Energy Progress | NDTF | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt securities, available-for-sale	736	756
Duke Energy Progress | NDTF equity securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity securities, FV-NI	2,970	2,459
Duke Energy Progress | NDTF equity securities | Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity securities, FV-NI	2,970	2,459
Duke Energy Progress | Other cash and cash equivalents
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	16	1
Duke Energy Progress | Other cash and cash equivalents | Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	16	1
Duke Energy Florida
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt securities, available-for-sale	451
Total assets	582	663
Derivative liabilities	(14)
Net assets (liabilities)	568	663
Duke Energy Florida | Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total assets	470	608
Net assets (liabilities)	470	608
Duke Energy Florida | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total assets	112	55
Derivative liabilities	(14)
Net assets (liabilities)	98	55
Duke Energy Florida | NDTF
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	13	71
Equity securities, FV-NI	115	91
Debt securities, available-for-sale	425	474
Duke Energy Florida | NDTF | Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	13	71
Debt securities, available-for-sale	339	445
Duke Energy Florida | NDTF | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt securities, available-for-sale	86	29
Duke Energy Florida | NDTF equity securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity securities, FV-NI	115	91
Duke Energy Florida | NDTF equity securities | Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity securities, FV-NI	115	91
Duke Energy Florida | Other Investments
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt securities, available-for-sale	26	26
Duke Energy Florida | Other Investments | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt securities, available-for-sale	26	26
Duke Energy Florida | Other cash and cash equivalents
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	3	1
Duke Energy Florida | Other cash and cash equivalents | Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	3	1
Duke Energy Indiana
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt securities, available-for-sale	64
Derivative assets	23	6
Total assets	184	149
Derivative liabilities	(27)	(1)
Net assets (liabilities)	157	148
Duke Energy Indiana | Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative assets	1
Total assets	98	98
Derivative liabilities	(13)	(1)
Net assets (liabilities)	85	97
Duke Energy Indiana | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total assets	64	45
Derivative liabilities	(14)
Net assets (liabilities)	50	45
Duke Energy Indiana | Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative assets	22	6
Total assets	22	6
Net assets (liabilities)	22	6
Duke Energy Indiana | Other Investments
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity securities, FV-NI	97	97
Debt securities, available-for-sale	64	45
Duke Energy Indiana | Other Investments | Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity securities, FV-NI	97	97
Duke Energy Indiana | Other Investments | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt securities, available-for-sale	64	45
Duke Energy Indiana | Other cash and cash equivalents
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents		1
Duke Energy Indiana | Other cash and cash equivalents | Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents		1
Piedmont
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative assets	3	1
Derivative liabilities	(139)	(122)
Net assets (liabilities)	(136)	(121)
Piedmont | Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative assets	3	1
Net assets (liabilities)	3	1
Piedmont | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative liabilities	(139)
Net assets (liabilities)	$ (139)
Piedmont | Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative liabilities		(122)
Net assets (liabilities)		$ (122)

Fair Value Measurements (Reconc

Fair Value Measurements (Reconciliation of Assets and Liabilities Measured at Fair Value on a Recurring Basis Using Unobservable Inputs) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Derivatives (net)
Balance at beginning of period	$ (77)	$ (102)
Total pretax realized or unrealized losses included in comprehensive income	(75)	(84)
Purchases	21	14
Settlements	(5)	(19)
Net transfers Out of Level 3		117
Total gains (losses) included on the Consolidated Balance Sheet	15	(3)
Ending balance	(121)	(77)
Duke Energy Indiana
Derivatives (net)
Balance at beginning of period	6	11
Purchases	18	10
Settlements	(16)	(13)
Total gains (losses) included on the Consolidated Balance Sheet	14	(2)
Ending balance	$ 22	6
Piedmont
Derivatives (net)
Balance at beginning of period		(117)
Net transfers Out of Level 3		$ 117

Fair Value Measurements (Quanti

Fair Value Measurements (Quantitative Level 3 Fair Value Disclosure) (Details) $ in Millions	Dec. 31, 2021USD ($)$ / MWh	Dec. 31, 2020USD ($)$ / MWh	Dec. 31, 2019USD ($)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Net derivative asset (liability) | $	$ (121)	$ (77)	$ (102)
Forward natural gas curves – price per MMBtu | Discounted cash flow
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Net derivative asset (liability) | $		$ (84)
Forward natural gas curves – price per MMBtu | RTO auction pricing
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Net derivative asset (liability) | $	$ (145)
Forward natural gas curves – price per MMBtu | Minimum | Discounted cash flow
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Input measurement (in usd per MWh and usd per MMBtu)		14.68
Forward natural gas curves – price per MMBtu | Minimum | RTO auction pricing
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Input measurement (in usd per MWh and usd per MMBtu)	19.04
Forward natural gas curves – price per MMBtu | Maximum | Discounted cash flow
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Input measurement (in usd per MWh and usd per MMBtu)		151.84
Forward natural gas curves – price per MMBtu | Maximum | RTO auction pricing
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Input measurement (in usd per MWh and usd per MMBtu)	139.11
Forward natural gas curves – price per MMBtu | Weighted Average | Discounted cash flow
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Input measurement (in usd per MWh and usd per MMBtu)		28.84
Forward natural gas curves – price per MMBtu | Weighted Average | RTO auction pricing
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Input measurement (in usd per MWh and usd per MMBtu)	37.57
Duke Energy Ohio | FTR price – per MWh | RTO auction pricing
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Net derivative asset (liability) | $	$ 2	$ 1
Duke Energy Ohio | FTR price – per MWh | Minimum | RTO auction pricing
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Input measurement (in usd per MWh and usd per MMBtu)	0.06	0.25
Duke Energy Ohio | FTR price – per MWh | Maximum | RTO auction pricing
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Input measurement (in usd per MWh and usd per MMBtu)	1.79	1.68
Duke Energy Ohio | FTR price – per MWh | Weighted Average | RTO auction pricing
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Input measurement (in usd per MWh and usd per MMBtu)	0.96	0.79
Duke Energy Indiana
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Net derivative asset (liability) | $	$ 22	$ 6	$ 11
Duke Energy Indiana | FTR price – per MWh | RTO auction pricing
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Net derivative asset (liability) | $	$ 22	$ 6
Duke Energy Indiana | FTR price – per MWh | Minimum | RTO auction pricing
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Input measurement (in usd per MWh and usd per MMBtu)	(1.18)	(2.40)
Duke Energy Indiana | FTR price – per MWh | Maximum | RTO auction pricing
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Input measurement (in usd per MWh and usd per MMBtu)	13.11	7.41
Duke Energy Indiana | FTR price – per MWh | Weighted Average | RTO auction pricing
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Input measurement (in usd per MWh and usd per MMBtu)	2.68	1.05

Fair Value Measurements (Other

Fair Value Measurements (Other Fair Value Disclosures) (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term Debt	$ 63,835	$ 59,863
Long-term debt, fair value	69,683	69,292
Unamortized debt discount and premium, net	1,250	1,300
Duke Energy Carolinas
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term Debt	13,275	12,218
Long-term debt, fair value	15,101	14,917
Progress Energy
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term Debt	20,823	19,264
Long-term debt, fair value	23,751	23,470
Duke Energy Progress
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term Debt	10,249	9,258
Long-term debt, fair value	11,252	10,862
Duke Energy Florida
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term Debt	8,482	7,915
Long-term debt, fair value	9,772	9,756
Duke Energy Ohio
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term Debt	3,193	3,089
Long-term debt, fair value	3,570	3,650
Duke Energy Indiana
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term Debt	4,323	4,091
Long-term debt, fair value	5,067	5,204
Piedmont
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term Debt	2,968	2,780
Long-term debt, fair value	$ 3,278	$ 3,306

Variable Interest Entities (Nar

Variable Interest Entities (Narrative) (Details) - USD ($)	1 Months Ended	12 Months Ended
	Nov. 30, 2021	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Feb. 28, 2021
Consolidated VIEs
Variable Interest Entity [Line Items]
Financial support		$ 0	$ 0	$ 0
ACP | Current Liabilities | Atlantic Coast Pipeline (ACP)
Variable Interest Entity [Line Items]
Guarantor obligations settled					$ 855,000,000
ACP | Non-consolidated VIEs
Variable Interest Entity [Line Items]
VIE Ownership interest		47.00%
Atlantic Coast Pipeline (ACP) | Current Liabilities | Atlantic Coast Pipeline (ACP)
Variable Interest Entity [Line Items]
Guarantor obligations settled					$ 855,000,000
CRC
Variable Interest Entity [Line Items]
Variation in credit losses		10.00%
Variation in discount rates		20.00%
CRC | Consolidated VIEs
Variable Interest Entity [Line Items]
Percent of proceeds received as cash		75.00%
Percent of proceeds received as subordinated note		25.00%
Minimum Equity Balance required by Cinergy Receivables		$ 3,000,000
CRC | Duke Energy Ohio | Non-consolidated VIEs
Variable Interest Entity [Line Items]
Fixed interest rate added to LIBOR to compute variable rate		1.00%
DECNCSF | Duke Energy Carolinas | Consolidated VIEs
Variable Interest Entity [Line Items]
Proceeds from issuance of senior secured bonds	$ 237,000,000
VIE With Ownership In Portfolio Of Wind Projects | Non-consolidated VIEs
Variable Interest Entity [Line Items]
VIE Ownership interest		50.00%
OVEC | Duke Energy Ohio | Non-consolidated VIEs
Variable Interest Entity [Line Items]
VIE Ownership interest		9.00%
DEPNCSF | Duke Energy Progress | Consolidated VIEs
Variable Interest Entity [Line Items]
Proceeds from issuance of senior secured bonds	$ 770,000,000

Variable Interest Entities (Sch

Variable Interest Entities (Schedule of Accounts Receivable Securitizations) (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Variable Interest Entity [Line Items]
Long-Term Debt	$ 60,448	$ 55,625
Duke Energy Carolinas
Variable Interest Entity [Line Items]
Long-Term Debt	12,595	11,412
Duke Energy Progress
Variable Interest Entity [Line Items]
Long-Term Debt	9,543	8,505
Duke Energy Florida
Variable Interest Entity [Line Items]
Long-Term Debt	8,406	7,092
CRC | Consolidated VIEs
Variable Interest Entity [Line Items]
Facility size	350
Long-Term Debt	350	350
Restricted Receivables	587	547
DERF | Duke Energy Carolinas | Consolidated VIEs
Variable Interest Entity [Line Items]
Facility size	475
Long-Term Debt	475	364
Restricted Receivables	844	696
DEPR | Duke Energy Progress | Consolidated VIEs
Variable Interest Entity [Line Items]
Facility size	350
Long-Term Debt	350	250
Restricted Receivables	574	500
DEFR | Duke Energy Florida | Consolidated VIEs
Variable Interest Entity [Line Items]
Facility size	250
Long-Term Debt	250	250
Restricted Receivables	$ 427	$ 397

Variable Interest Entities (Con

Variable Interest Entities (Consolidated VIEs) (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Variable Interest Entity [Line Items]
Regulatory Assets: Current	$ 2,150	$ 1,641
Current Assets: Other	638	462
Property, Plant and Equipment: Cost	161,819	155,580
Accumulated depreciation and amortization	(50,555)	(48,827)
Other Noncurrent Assets: Other	3,812	3,601
Other Noncurrent Assets: Regulatory assets	12,487	12,421
Current Liabilities: Other	2,471	2,936
Current maturities of long-term debt	3,387	4,238
Long-Term Debt	60,448	55,625
Asset retirement obligations	12,129	12,286
Other Noncurrent Liabilities: Other	1,650	1,719
Duke Energy Florida
Variable Interest Entity [Line Items]
Regulatory Assets: Current	497	265
Current Assets: Other	80	41
Property, Plant and Equipment: Cost	23,865	22,123
Accumulated depreciation and amortization	(5,819)	(5,560)
Other Noncurrent Assets: Other	399	335
Other Noncurrent Assets: Regulatory assets	1,791	1,799
Current Liabilities: Other	408	374
Current maturities of long-term debt	76	823
Long-Term Debt	8,406	7,092
Asset retirement obligations	436	514
Other Noncurrent Liabilities: Other	309	209
Duke Energy Carolinas
Variable Interest Entity [Line Items]
Regulatory Assets: Current	544	473
Current Assets: Other	95	20
Property, Plant and Equipment: Cost	51,874	50,640
Accumulated depreciation and amortization	(17,854)	(17,453)
Other Noncurrent Assets: Other	1,248	1,187
Other Noncurrent Assets: Regulatory assets	2,935	2,996
Current Liabilities: Other	546	546
Current maturities of long-term debt	362	506
Long-Term Debt	12,595	11,412
Asset retirement obligations	5,052	5,086
Other Noncurrent Liabilities: Other	536	626
Duke Energy Progress
Variable Interest Entity [Line Items]
Regulatory Assets: Current	533	492
Current Assets: Other	83	60
Property, Plant and Equipment: Cost	37,018	35,759
Accumulated depreciation and amortization	(13,387)	(12,801)
Other Noncurrent Assets: Other	792	740
Other Noncurrent Assets: Regulatory assets	4,118	3,976
Current Liabilities: Other	448	411
Current maturities of long-term debt	556	603
Long-Term Debt	9,543	8,505
Asset retirement obligations	5,401	5,352
Other Noncurrent Liabilities: Other	87	102
DEFPF | Duke Energy Florida | Consolidated VIEs
Variable Interest Entity [Line Items]
Receivables of VIEs	5	4
Regulatory Assets: Current	54	53
Current Assets: Other	39	39
Other Noncurrent Assets: Regulatory assets	883	937
Current Liabilities: Other	9	10
Current maturities of long-term debt	56	55
Long-Term Debt	946	1,002
DECNCSF | Duke Energy Carolinas | Consolidated VIEs
Variable Interest Entity [Line Items]
Regulatory Assets: Current	12
Other Noncurrent Assets: Other	1
Other Noncurrent Assets: Regulatory assets	220
Current Liabilities: Other	1
Current maturities of long-term debt	5
Long-Term Debt	228
DEPNCSF | Duke Energy Progress | Consolidated VIEs
Variable Interest Entity [Line Items]
Regulatory Assets: Current	39
Other Noncurrent Assets: Other	4
Other Noncurrent Assets: Regulatory assets	720
Current Liabilities: Other	2
Current maturities of long-term debt	15
Long-Term Debt	747
Commercial Renewables | Consolidated VIEs
Variable Interest Entity [Line Items]
Current Assets: Other	215	257
Property, Plant and Equipment: Cost	7,339	6,394
Accumulated depreciation and amortization	(1,474)	(1,242)
Other Noncurrent Assets: Other	62	67
Current maturities of long-term debt	167	167
Long-Term Debt	1,475	1,569
Asset retirement obligations	173	148
Other Noncurrent Liabilities: Other	$ 319	$ 316

Variable Interest Entities (S_2

Variable Interest Entities (Schedule of Non-Consolidated VIEs) (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Variable Interest Entity [Line Items]
Investments in equity method unconsolidated affiliates	$ 970	$ 961
Other noncurrent assets	3,812	3,601
Total Assets	169,587	162,388	$ 158,838
Other current liabilities	2,471	2,936
Other Noncurrent Liabilities: Other	1,650	1,719
Non-consolidated VIEs
Variable Interest Entity [Line Items]
Investments in equity method unconsolidated affiliates	523	530
Other noncurrent assets	61	31
Total Assets	584	561
Other current liabilities	51	933
Other Noncurrent Liabilities: Other	57	18
Total liabilities	108	951
Net (liabilities) assets	476	(390)
Duke Energy Ohio
Variable Interest Entity [Line Items]
Receivables from affiliated companies	122	102
Other noncurrent assets	84	72
Total Assets	10,774	10,025	$ 9,338
Other current liabilities	82	70
Other Noncurrent Liabilities: Other	101	99
Duke Energy Ohio | Non-consolidated VIEs
Variable Interest Entity [Line Items]
Receivables from affiliated companies	79	83
Total Assets	79	83
Net (liabilities) assets	79	83
Duke Energy Indiana
Variable Interest Entity [Line Items]
Receivables from affiliated companies	98	112
Other noncurrent assets	296	253
Total Assets	14,488	14,041
Other current liabilities	105	83
Other Noncurrent Liabilities: Other	44	30
Duke Energy Indiana | Non-consolidated VIEs
Variable Interest Entity [Line Items]
Receivables from affiliated companies	97	110
Total Assets	97	110
Net (liabilities) assets	97	110
Pipeline Investments | Non-consolidated VIEs
Variable Interest Entity [Line Items]
Investments in equity method unconsolidated affiliates	15
Other noncurrent assets	61	31
Total Assets	76	31
Other current liabilities	47	928
Other Noncurrent Liabilities: Other	54	8
Total liabilities	101	936
Net (liabilities) assets	(25)	(905)
Commercial Renewables | Non-consolidated VIEs
Variable Interest Entity [Line Items]
Investments in equity method unconsolidated affiliates	508	530
Total Assets	508	530
Other current liabilities	4	5
Other Noncurrent Liabilities: Other	3	10
Total liabilities	7	15
Net (liabilities) assets	$ 501	$ 515

Variable Interest Entities (Fai

Variable Interest Entities (Fair Value Assumptions) (Details) - CRC - Non-consolidated VIEs	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Duke Energy Ohio
Variable Interest Entity [Line Items]
Anticipated credit loss ratio	0.50%	0.50%
Discount rate	1.10%	1.60%
Receivable turnover rate	13.50%	13.40%
Duke Energy Indiana
Variable Interest Entity [Line Items]
Anticipated credit loss ratio	0.30%	0.30%
Discount rate	1.10%	1.60%
Receivable turnover rate	11.30%	11.30%

Variable Interest Entities (Rec

Variable Interest Entities (Receivables Sold) (Details) - CRC - Non-consolidated VIEs - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Duke Energy Ohio
Variable Interest Entity [Line Items]
Receivables sold	$ 269	$ 270
Less: Retained interests	79	83
Net receivables sold	190	187
Duke Energy Indiana
Variable Interest Entity [Line Items]
Receivables sold	328	344
Less: Retained interests	97	110
Net receivables sold	$ 231	$ 234

Variable Interest Entities (Sal

Variable Interest Entities (Sales and Cash Flows) (Details) - Non-consolidated VIEs - CRC - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Duke Energy Ohio
Variable Interest Entity [Line Items]
Receivables sold	$ 2,023	$ 1,905	$ 1,979
Loss recognized on sale	10	10	14
Cash proceeds from receivables sold	2,018	1,875	1,993
Collection fees received	1	1	1
Return received on retained interests	4	4	6
Duke Energy Indiana
Variable Interest Entity [Line Items]
Receivables sold	2,909	2,631	2,837
Loss recognized on sale	13	12	17
Cash proceeds from receivables sold	2,909	2,586	2,860
Collection fees received	1	1	1
Return received on retained interests	$ 6	$ 5	$ 9

Revenue (Remaining Performance

Revenue (Remaining Performance Obligations) (Details) $ in Millions	Dec. 31, 2021USD ($)
Progress Energy
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, amount	$ 264
Progress Energy | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, amount	$ 109
Revenue, remaining performance obligation, expected timing of satisfaction, period	1 year
Progress Energy | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, amount	$ 53
Revenue, remaining performance obligation, expected timing of satisfaction, period	1 year
Progress Energy | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, amount	$ 45
Revenue, remaining performance obligation, expected timing of satisfaction, period	1 year
Progress Energy | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, amount	$ 7
Revenue, remaining performance obligation, expected timing of satisfaction, period	1 year
Progress Energy | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, amount	$ 7
Revenue, remaining performance obligation, expected timing of satisfaction, period	1 year
Progress Energy | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2027-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, amount	$ 43
Revenue, remaining performance obligation, expected timing of satisfaction, period	1 year
Duke Energy Progress
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, amount	$ 24
Duke Energy Progress | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, amount	$ 8
Revenue, remaining performance obligation, expected timing of satisfaction, period	1 year
Duke Energy Progress | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, amount	$ 8
Revenue, remaining performance obligation, expected timing of satisfaction, period	1 year
Duke Energy Progress | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, amount	$ 8
Revenue, remaining performance obligation, expected timing of satisfaction, period	1 year
Duke Energy Progress | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, expected timing of satisfaction, period	1 year
Duke Energy Progress | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, expected timing of satisfaction, period	1 year
Duke Energy Progress | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2027-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, expected timing of satisfaction, period	1 year
Duke Energy Florida
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, amount	$ 240
Duke Energy Florida | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, amount	$ 101
Revenue, remaining performance obligation, expected timing of satisfaction, period	1 year
Duke Energy Florida | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, amount	$ 45
Revenue, remaining performance obligation, expected timing of satisfaction, period	1 year
Duke Energy Florida | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, amount	$ 37
Revenue, remaining performance obligation, expected timing of satisfaction, period	1 year
Duke Energy Florida | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, amount	$ 7
Revenue, remaining performance obligation, expected timing of satisfaction, period	1 year
Duke Energy Florida | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, amount	$ 7
Revenue, remaining performance obligation, expected timing of satisfaction, period	1 year
Duke Energy Florida | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2027-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, amount	$ 43
Revenue, remaining performance obligation, expected timing of satisfaction, period	1 year
Duke Energy Indiana
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, amount	$ 64
Duke Energy Indiana | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, amount	$ 1
Revenue, remaining performance obligation, expected timing of satisfaction, period	1 year
Duke Energy Indiana | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, amount	$ 9
Revenue, remaining performance obligation, expected timing of satisfaction, period	1 year
Duke Energy Indiana | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, amount	$ 14
Revenue, remaining performance obligation, expected timing of satisfaction, period	1 year
Duke Energy Indiana | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, amount	$ 14
Revenue, remaining performance obligation, expected timing of satisfaction, period	1 year
Duke Energy Indiana | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, amount	$ 14
Revenue, remaining performance obligation, expected timing of satisfaction, period	1 year
Duke Energy Indiana | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2027-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, amount	$ 12
Revenue, remaining performance obligation, expected timing of satisfaction, period	1 year
Piedmont
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, amount	$ 592
Piedmont | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, amount	$ 71
Revenue, remaining performance obligation, expected timing of satisfaction, period	1 year
Piedmont | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, amount	$ 64
Revenue, remaining performance obligation, expected timing of satisfaction, period	1 year
Piedmont | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, amount	$ 61
Revenue, remaining performance obligation, expected timing of satisfaction, period	1 year
Piedmont | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, amount	$ 60
Revenue, remaining performance obligation, expected timing of satisfaction, period	1 year
Piedmont | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, amount	$ 50
Revenue, remaining performance obligation, expected timing of satisfaction, period	1 year
Piedmont | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2027-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, amount	$ 286
Revenue, remaining performance obligation, expected timing of satisfaction, period	1 year

Revenue (Disaggregation of Reve

Revenue (Disaggregation of Revenue) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	$ 24,703	$ 23,480	$ 24,348
Revenue from sources other than contracts with customers	394	388	731
Total operating revenues	25,097	23,868	25,079
Other
Disaggregation of Revenue [Line Items]
Total operating revenues	1,129	1,069	1,037
Electric Utilities and Infrastructure
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	22,474	21,637	22,347
Total operating revenues	22,570	21,687	22,798
Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | Residential
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	10,097	9,806	9,863
Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | General
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	6,375	6,194	6,431
Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | Industrial
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	2,924	2,859	3,071
Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | Wholesale
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	2,199	1,864	2,212
Electric Utilities and Infrastructure | Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	879	914	770
Total operating revenues	977	944	855
Gas Utilities and Infrastructure
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1,983	1,590	1,754
Total operating revenues	2,022	1,653	1,770
Gas Utilities and Infrastructure | Gas Utilities and Infrastructure | Residential
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1,131	930	976
Gas Utilities and Infrastructure | Gas Utilities and Infrastructure | Commercial
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	561	446	508
Gas Utilities and Infrastructure | Gas Utilities and Infrastructure | Industrial
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	158	127	141
Gas Utilities and Infrastructure | Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	133	87	129
Total operating revenues	87	57	84
Commercial Renewables
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	217	227	223
Total operating revenues	476	502	487
Commercial Renewables | Other
Disaggregation of Revenue [Line Items]
Total operating revenues	65	68	98
Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	29	26	24
Total operating revenues	29	26	24
Duke Energy Carolinas
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	7,145	7,028	7,241
Revenue from sources other than contracts with customers	(43)	(13)	154
Total operating revenues	7,102	7,015	7,395
Duke Energy Carolinas | Electric Utilities and Infrastructure
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	7,145	7,028	7,241
Duke Energy Carolinas | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | Residential
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	3,054	2,997	3,044
Duke Energy Carolinas | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | General
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	2,210	2,233	2,244
Duke Energy Carolinas | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | Industrial
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1,145	1,137	1,215
Duke Energy Carolinas | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | Wholesale
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	472	380	462
Duke Energy Carolinas | Electric Utilities and Infrastructure | Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	264	281	276
Progress Energy
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	10,962	10,521	10,883
Revenue from sources other than contracts with customers	95	106	319
Total operating revenues	11,057	10,627	11,202
Progress Energy | Electric Utilities and Infrastructure
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	10,962	10,521	10,883
Progress Energy | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | Residential
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	5,084	5,017	4,998
Progress Energy | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | General
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	2,883	2,779	2,935
Progress Energy | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | Industrial
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	894	901	934
Progress Energy | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | Wholesale
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1,385	1,228	1,468
Progress Energy | Electric Utilities and Infrastructure | Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	716	596	548
Duke Energy Progress
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	5,719	5,348	5,785
Revenue from sources other than contracts with customers	61	74	172
Total operating revenues	5,780	5,422	5,957
Duke Energy Progress | Electric Utilities and Infrastructure
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	5,719	5,348	5,785
Duke Energy Progress | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | Residential
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	2,156	2,059	2,144
Duke Energy Progress | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | General
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1,378	1,312	1,368
Duke Energy Progress | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | Industrial
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	634	649	675
Duke Energy Progress | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | Wholesale
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1,164	1,034	1,281
Duke Energy Progress | Electric Utilities and Infrastructure | Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	387	294	317
Duke Energy Florida
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	5,243	5,173	5,098
Revenue from sources other than contracts with customers	16	15	133
Total operating revenues	5,259	5,188	5,231
Duke Energy Florida | Electric Utilities and Infrastructure
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	5,243	5,173	5,098
Duke Energy Florida | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | Residential
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	2,928	2,958	2,854
Duke Energy Florida | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | General
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1,505	1,467	1,567
Duke Energy Florida | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | Industrial
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	260	252	259
Duke Energy Florida | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | Wholesale
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	221	194	187
Duke Energy Florida | Electric Utilities and Infrastructure | Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	329	302	231
Duke Energy Ohio
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	2,026	1,870	1,940
Revenue from sources other than contracts with customers	11	(12)	0
Total operating revenues	2,037	1,858	1,940
Duke Energy Ohio | Electric Utilities and Infrastructure
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1,481	1,419	1,457
Duke Energy Ohio | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | Residential
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	767	726	733
Duke Energy Ohio | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | General
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	440	442	451
Duke Energy Ohio | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | Industrial
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	135	137	147
Duke Energy Ohio | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | Wholesale
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	56	32	46
Duke Energy Ohio | Electric Utilities and Infrastructure | Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	83	82	80
Duke Energy Ohio | Gas Utilities and Infrastructure
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	545	451	483
Duke Energy Ohio | Gas Utilities and Infrastructure | Gas Utilities and Infrastructure | Residential
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	354	300	315
Duke Energy Ohio | Gas Utilities and Infrastructure | Gas Utilities and Infrastructure | Commercial
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	143	117	130
Duke Energy Ohio | Gas Utilities and Infrastructure | Gas Utilities and Infrastructure | Industrial
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	20	17	19
Duke Energy Ohio | Gas Utilities and Infrastructure | Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	28	17	19
Duke Energy Indiana
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	3,134	2,783	2,987
Revenue from sources other than contracts with customers	40	12	17
Total operating revenues	3,174	2,795	3,004
Duke Energy Indiana | Electric Utilities and Infrastructure
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	3,134	2,783	2,987
Duke Energy Indiana | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | Residential
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1,188	1,064	1,087
Duke Energy Indiana | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | General
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	825	740	802
Duke Energy Indiana | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | Industrial
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	750	683	774
Duke Energy Indiana | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | Wholesale
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	285	224	235
Duke Energy Indiana | Electric Utilities and Infrastructure | Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	86	72	89
Piedmont
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1,469	1,173	1,322
Revenue from sources other than contracts with customers	100	124	59
Total operating revenues	1,569	1,297	1,381
Piedmont | Gas Utilities and Infrastructure
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1,469	1,173	1,322
Piedmont | Gas Utilities and Infrastructure | Gas Utilities and Infrastructure | Residential
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	777	630	661
Piedmont | Gas Utilities and Infrastructure | Gas Utilities and Infrastructure | Commercial
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	418	329	378
Piedmont | Gas Utilities and Infrastructure | Gas Utilities and Infrastructure | Industrial
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	137	110	122
Piedmont | Gas Utilities and Infrastructure | Gas Utilities and Infrastructure | Power Generation
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	92	34	51
Piedmont | Gas Utilities and Infrastructure | Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	$ 45	$ 70	$ 110

Revenue (Reserve for Credit Los

Revenue (Reserve for Credit Losses for Trade and Other Receivables) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	$ 146	$ 76
Cumulative Change in Accounting Principle	122	146
Write-Offs	(58)	(58)
Credit Loss Expense	54	75
Other Adjustments	(20)	48
Ending balance	122	146
Duke Energy Carolinas
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	23	10
Cumulative Change in Accounting Principle	42	23
Write-Offs	(21)	(13)
Credit Loss Expense	27	13
Other Adjustments	13	12
Ending balance	42	23
Progress Energy
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	37	16
Cumulative Change in Accounting Principle	36	37
Write-Offs	(25)	(23)
Credit Loss Expense	25	29
Other Adjustments	(1)	13
Ending balance	36	37
Duke Energy Progress
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	23	8
Cumulative Change in Accounting Principle	21	23
Write-Offs	(12)	(8)
Credit Loss Expense	11	9
Other Adjustments	(1)	13
Ending balance	21	23
Duke Energy Florida
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	14	7
Cumulative Change in Accounting Principle	16	14
Write-Offs	(13)	(14)
Credit Loss Expense	14	20
Other Adjustments	1
Ending balance	16	14
Duke Energy Ohio
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	4	4
Cumulative Change in Accounting Principle	4	4
Ending balance	4	4
Duke Energy Indiana
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	3	3
Cumulative Change in Accounting Principle	3	3
Ending balance	3	3
Piedmont
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	12	6
Cumulative Change in Accounting Principle	15	12
Write-Offs	(9)	(6)
Credit Loss Expense	7	11
Other Adjustments	5
Ending balance	$ 15	12
Cumulative Change in Accounting Principle
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance		5
Cumulative Change in Accounting Principle
Cumulative Change in Accounting Principle | Duke Energy Carolinas
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance		1
Cumulative Change in Accounting Principle
Cumulative Change in Accounting Principle | Progress Energy
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance		2
Cumulative Change in Accounting Principle
Cumulative Change in Accounting Principle | Duke Energy Progress
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance		1
Cumulative Change in Accounting Principle
Cumulative Change in Accounting Principle | Duke Energy Florida
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance		1
Cumulative Change in Accounting Principle
Cumulative Change in Accounting Principle | Piedmont
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance		$ 1
Cumulative Change in Accounting Principle

Revenue (Aging of Trade Receiva

Revenue (Aging of Trade Receivables) (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Financing Receivable, Past Due [Line Items]
Unbilled receivables	$ 964	$ 969
Not past due	2,104	1,789
Deferred Payment Arrangements	115	215
Trade and Other Receivables	3,732	3,299
30-60 days
Financing Receivable, Past Due [Line Items]
Past due	212	185
60-90 days
Financing Receivable, Past Due [Line Items]
Past due	88	22
90+ days
Financing Receivable, Past Due [Line Items]
Past due	249	119
Duke Energy Carolinas
Financing Receivable, Past Due [Line Items]
Unbilled receivables	316	328
Not past due	595	445
Deferred Payment Arrangements	55	96
Trade and Other Receivables	1,186	966
Duke Energy Carolinas | 30-60 days
Financing Receivable, Past Due [Line Items]
Past due	77	80
Duke Energy Carolinas | 60-90 days
Financing Receivable, Past Due [Line Items]
Past due	37	1
Duke Energy Carolinas | 90+ days
Financing Receivable, Past Due [Line Items]
Past due	106	16
Progress Energy
Financing Receivable, Past Due [Line Items]
Unbilled receivables	266	283
Not past due	800	707
Deferred Payment Arrangements	45	80
Trade and Other Receivables	1,289	1,166
Progress Energy | 30-60 days
Financing Receivable, Past Due [Line Items]
Past due	72	54
Progress Energy | 60-90 days
Financing Receivable, Past Due [Line Items]
Past due	41	10
Progress Energy | 90+ days
Financing Receivable, Past Due [Line Items]
Past due	65	32
Duke Energy Progress
Financing Receivable, Past Due [Line Items]
Unbilled receivables	193	167
Not past due	405	398
Deferred Payment Arrangements	22	52
Trade and Other Receivables	722	655
Duke Energy Progress | 30-60 days
Financing Receivable, Past Due [Line Items]
Past due	44	25
Duke Energy Progress | 60-90 days
Financing Receivable, Past Due [Line Items]
Past due	21	4
Duke Energy Progress | 90+ days
Financing Receivable, Past Due [Line Items]
Past due	37	9
Duke Energy Florida
Financing Receivable, Past Due [Line Items]
Unbilled receivables	73	116
Not past due	393	307
Deferred Payment Arrangements	23	28
Trade and Other Receivables	565	509
Duke Energy Florida | 30-60 days
Financing Receivable, Past Due [Line Items]
Past due	28	29
Duke Energy Florida | 60-90 days
Financing Receivable, Past Due [Line Items]
Past due	20	6
Duke Energy Florida | 90+ days
Financing Receivable, Past Due [Line Items]
Past due	28	23
Duke Energy Ohio
Financing Receivable, Past Due [Line Items]
Unbilled receivables	4	2
Not past due	42	60
Deferred Payment Arrangements	2
Trade and Other Receivables	100	102
Duke Energy Ohio | 30-60 days
Financing Receivable, Past Due [Line Items]
Past due	4	8
Duke Energy Ohio | 60-90 days
Financing Receivable, Past Due [Line Items]
Past due	1	2
Duke Energy Ohio | 90+ days
Financing Receivable, Past Due [Line Items]
Past due	47	30
Duke Energy Indiana
Financing Receivable, Past Due [Line Items]
Unbilled receivables	27	16
Not past due	51	26
Trade and Other Receivables	103	58
Duke Energy Indiana | 30-60 days
Financing Receivable, Past Due [Line Items]
Past due	13	3
Duke Energy Indiana | 60-90 days
Financing Receivable, Past Due [Line Items]
Past due	1	1
Duke Energy Indiana | 90+ days
Financing Receivable, Past Due [Line Items]
Past due	11	12
Piedmont
Financing Receivable, Past Due [Line Items]
Unbilled receivables	106	86
Not past due	202	149
Deferred Payment Arrangements	4	7
Trade and Other Receivables	333	262
Piedmont | 30-60 days
Financing Receivable, Past Due [Line Items]
Past due	12	8
Piedmont | 60-90 days
Financing Receivable, Past Due [Line Items]
Past due	2	3
Piedmont | 90+ days
Financing Receivable, Past Due [Line Items]
Past due	$ 7	$ 9

Revenue (Unbilled Revenues) (De

Revenue (Unbilled Revenues) (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unbilled receivables	$ 964	$ 969
Duke Energy Carolinas
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unbilled receivables	316	328
Progress Energy
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unbilled receivables	266	283
Duke Energy Progress
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unbilled receivables	193	167
Duke Energy Florida
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unbilled receivables	73	116
Duke Energy Ohio
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unbilled receivables	4	2
Duke Energy Ohio | CRC
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unbilled receivables	82	87
Duke Energy Indiana
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unbilled receivables	27	16
Duke Energy Indiana | CRC
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unbilled receivables	121	134
Piedmont
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unbilled receivables	$ 106	$ 86

Stockholders' Equity (Earnings

Stockholders' Equity (Earnings Per Share Data) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Class of Stock [Line Items]
Net Income available to Duke Energy common stockholders	$ 3,802	$ 1,270	$ 3,707
Income (Loss) From Discontinued Operations, net of tax	(7)	(7)	7
Accumulated preferred stock dividends adjustment		1	(15)
Less: Impact of participating securities	4	2	5
Income from continuing operations available to Duke Energy common stockholders	$ 3,791	$ 1,262	$ 3,694
Weighted average common shares outstanding – basic (in shares)	769	737	729
Equity forwards (in shares)		1
Weighted average common shares outstanding – diluted (in shares)	769	738	729
EPS from continuing operations available to Duke Energy common stockholders
Basic (usd per share)	$ 4.93	$ 1.71	$ 5.07
Diluted (usd per share)	$ 4.93	$ 1.71	$ 5.07
Potentially dilutive items excluded from the calculation (in shares)	2	2	2
Dividends declared per share (usd per share)	$ 3.90	$ 3.82	$ 3.75
Series A Preferred Stock
EPS from continuing operations available to Duke Energy common stockholders
Dividends declared on preferred stock (usd per share)	1.437	1.437	$ 1.03
Series B Preferred Stock
EPS from continuing operations available to Duke Energy common stockholders
Dividends declared on preferred stock (usd per share)	$ 48.750	$ 49.292

Stockholders' Equity (Common St

Stockholders' Equity (Common Stock) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Billions	1 Months Ended
	Dec. 31, 2020	Aug. 31, 2020	May 31, 2020	Mar. 31, 2020	Nov. 30, 2019
Forward Contract Indexed to Issuer's Equity [Line Items]
Maximum value of shares to be issued under ATM program					$ 1.5
Equity forwards
Forward Contract Indexed to Issuer's Equity [Line Items]
Shares offered		936	903	940	28,750
Forward Contract Indexed to Issuer's Equity, Forward Rate Per Share		$ 79.52	$ 82.44	$ 89.76	$ 85.99
Shares issued (in shares)	32,000
Proceeds from sale of equity	$ 2.6

Stockholders' Equity (Preferred

Stockholders' Equity (Preferred Stock) (Details) - USD ($) $ / shares in Units, $ in Millions	Sep. 16, 2024	Sep. 12, 2019	Mar. 29, 2019	Dec. 31, 2019	Jun. 15, 2024	Dec. 31, 2021	Dec. 31, 2020
Class of Stock [Line Items]
Net proceeds from Issuance of Preferred Stock and Preference Stock		$ 989	$ 973	$ 1,962
Current maturities of long-term debt						$ 3,387	$ 4,238
Series A Cumulative Redeemable Perpetual Preferred Stock
Class of Stock [Line Items]
Shares issued (in shares)			40,000,000
Preferred stock, issue price (in usd per share)			$ 25
Liquidation preference per share (in usd per share)			$ 25
Cumulative annual dividend rate			5.75%
Redemption price (in usd per share)						$ 25.50
Series B Fixed-Rate Reset Cumulative Redeemable Perpetual Preferred Stock
Class of Stock [Line Items]
Shares issued (in shares)		1,000,000
Preferred stock, issue price (in usd per share)		$ 1,000
Liquidation preference per share (in usd per share)		$ 1,000
Cumulative annual dividend rate		4.875%
Redemption price (in usd per share)		$ 1,020
Forecast
Class of Stock [Line Items]
Redemption price (in usd per share)					$ 25
Forecast | Series B Fixed-Rate Reset Cumulative Redeemable Perpetual Preferred Stock
Class of Stock [Line Items]
Cumulative annual dividend rate	3.388%
Unsecured Debt | Senior notes due September 2019 | Parent Company
Class of Stock [Line Items]
Current maturities of long-term debt		$ 500

Severance (Narrative) (Details)

Severance (Narrative) (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Restructuring Cost and Reserve [Line Items]
Regulatory assets	$ 14,637	$ 14,062
Duke Energy Carolinas
Restructuring Cost and Reserve [Line Items]
Regulatory assets	3,479	3,469
Duke Energy Carolinas | Employee Severance
Restructuring Cost and Reserve [Line Items]
Regulatory assets		65
Duke Energy Progress
Restructuring Cost and Reserve [Line Items]
Regulatory assets	$ 4,651	4,468
Duke Energy Progress | Employee Severance
Restructuring Cost and Reserve [Line Items]
Regulatory assets		$ 33

Severance (Expenses) (Details)

Severance (Expenses) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2021USD ($)employee	Dec. 31, 2020USD ($)employee	Dec. 31, 2019USD ($)employee
Restructuring Cost and Reserve [Line Items]
Number of eligible employees | employee	290	30	140
Severance expense	$ 69	$ (85)	$ 16
Amortization of deferred severance charges	33
Severance charges adjustments	(3)	(6)
Unamortized deferred severance		(86)
Duke Energy Carolinas
Restructuring Cost and Reserve [Line Items]
Severance expense	33	(58)	8
Amortization of deferred severance charges	22
Severance charges adjustments	(2)	(2)
Unamortized deferred severance		(57)
Progress Energy
Restructuring Cost and Reserve [Line Items]
Severance expense	26	(28)	6
Amortization of deferred severance charges	11
Severance charges adjustments		(3)
Unamortized deferred severance		(29)
Duke Energy Progress
Restructuring Cost and Reserve [Line Items]
Severance expense	20	(31)	3
Amortization of deferred severance charges	11
Severance charges adjustments		(2)
Unamortized deferred severance		(29)
Duke Energy Florida
Restructuring Cost and Reserve [Line Items]
Severance expense	6	$ 3	3
Duke Energy Ohio
Restructuring Cost and Reserve [Line Items]
Severance expense	2
Duke Energy Indiana
Restructuring Cost and Reserve [Line Items]
Severance expense	3		1
Severance charges adjustments	(1)
Piedmont
Restructuring Cost and Reserve [Line Items]
Severance expense	$ 2		$ 1

Severance (Rollforward) (Detail

Severance (Rollforward) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2021USD ($)
Restructuring Reserve [Roll Forward]
Balance, beginning of period	$ 11
Provision/adjustments	36
Cash reductions	(8)
Balance, end of period	39
Duke Energy Carolinas
Restructuring Reserve [Roll Forward]
Balance, beginning of period	2
Provision/adjustments	1
Cash reductions	(1)
Balance, end of period	2
Progress Energy
Restructuring Reserve [Roll Forward]
Balance, beginning of period	3
Provision/adjustments	1
Cash reductions	(2)
Balance, end of period	2
Duke Energy Progress
Restructuring Reserve [Roll Forward]
Balance, beginning of period	1
Provision/adjustments	1
Cash reductions	(1)
Balance, end of period	1
Duke Energy Florida
Restructuring Reserve [Roll Forward]
Balance, beginning of period	2
Cash reductions	(1)
Balance, end of period	1
Duke Energy Indiana
Restructuring Reserve [Roll Forward]
Balance, beginning of period	1
Cash reductions	$ (1)

Stock-Based Compensation (Narra

Stock-Based Compensation (Narrative) (Details) - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares reserved for awards to employees and outside directors (in shares)	10
RSU awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total grant date fair value of shares vested	$ 45	$ 43	$ 49
Unrecognized compensation cost	$ 35
Unrecognized compensation cost, period of recognition, years	23 months
RSU awards | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Performance awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Total grant date fair value of shares vested	$ 25	$ 36
Unrecognized compensation cost	$ 20
Unrecognized compensation cost, period of recognition, years	22 months
Risk free interest rate	0.24%
Expected volatility rate	26.90%
Performance awards | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percent	200.00%
Performance awards | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percent	0.00%

Stock-Based Compensation (Sched

Stock-Based Compensation (Schedule of Stock-Based Compensation Expense) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total expense recognized	$ 64	$ 61	$ 65
Pretax stock-based compensation cost	88	84	89
Stock-based compensation costs capitalized	5	5	5
Stock-based compensation expense	83	79	84
Tax benefit associated with stock-based compensation expense	19	18	19
RSU awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Pretax stock-based compensation cost	49	46	44
Performance awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Pretax stock-based compensation cost	39	38	45
Duke Energy Carolinas
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total expense recognized	23	22	24
Progress Energy
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total expense recognized	24	23	24
Duke Energy Progress
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total expense recognized	15	15	15
Duke Energy Florida
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total expense recognized	9	9	9
Duke Energy Ohio
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total expense recognized	5	4	5
Duke Energy Indiana
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total expense recognized	6	6	6
Piedmont
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total expense recognized	$ 3	$ 3	$ 3

Stock-Based Compensation (Summa

Stock-Based Compensation (Summary of Stock Awards Outstanding) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
RSU awards
Schedule Of Shares Awarded [Abstract]
Shares granted (in thousands)	673	498	571
Fair value (in millions)	$ 59	$ 50	$ 51
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Outstanding at beginning of period (in shares)	939
Granted (in shares)	673	498	571
Vested (in shares)	(502)
Forfeited (in shares)	(67)
Outstanding at end of period (in shares)	1,043	939
Stock awards expected to vest (in shares)	996
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]
Weighted average fair value at beginning of period (usd per share)	$ 93
Granted (usd per share)	88
Vested (usd per share)	89
Forfeited (usd per share)	92
Weighted average fair value at end of period (usd per share)	92	$ 93
Weighted average fair value of awards expected to vest (usd per share)	$ 92
Performance awards
Schedule Of Shares Awarded [Abstract]
Shares granted (in thousands)	380	319	320
Fair value (in millions)	$ 33	$ 34	$ 27
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Outstanding at beginning of period (in shares)	962
Granted (in shares)	380	319	320
Vested (in shares)	(346)
Forfeited (in shares)	(44)
Outstanding at end of period (in shares)	952	962
Stock awards expected to vest (in shares)	927
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]
Weighted average fair value at beginning of period (usd per share)	$ 87
Granted (usd per share)	88
Vested (usd per share)	73
Forfeited (usd per share)	92
Weighted average fair value at end of period (usd per share)	93	$ 87
Weighted average fair value of awards expected to vest (usd per share)	$ 93

Employee Benefit Plans (Narrati

Employee Benefit Plans (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Jan. 01, 2022
Defined Benefit Plan Disclosure [Line Items]
Maximum years of participation	35 years
Vesting period	3 years
Master Trust
Defined Benefit Plan Disclosure [Line Items]
Expected long-term rate of return on plan assets	6.50%
Target allocation	100.00%
Fair value of securities on loan	$ 542	$ 482
Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Employer contributions			$ 77
Pension Plan | Qualified Plan
Defined Benefit Plan Disclosure [Line Items]
Average remaining service period, in years	14 years
Projected benefit obligation	$ 8,207	8,634	$ 8,321
Accumulated Benefit Obligation at measurement date	8,144	8,577
Benefits paid	$ 615	$ 541
Expected long-term rate of return on plan assets	6.50%	6.85%	6.85%
Pension Plan | Nonqualified Plan
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	$ 300
Accumulated Benefit Obligation at measurement date	300
Employer contributions	24
Benefits paid	$ 24
Pension Plan | Master Trust
Defined Benefit Plan Disclosure [Line Items]
Master trust allocation percentage	98.00%
Other Post-Retirement Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Average remaining service period, in years	4 years
Projected benefit obligation	$ 625	$ 709	$ 723
Employer contributions	18
Benefits paid	$ 73	$ 75
Expected long-term rate of return on plan assets	6.50%	6.85%	6.85%
Other Post-Retirement Benefit Plans | Master Trust
Defined Benefit Plan Disclosure [Line Items]
Master trust allocation percentage	2.00%
Duke Energy Progress | Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Employer contributions			$ 4
Duke Energy Progress | Pension Plan | Qualified Plan
Defined Benefit Plan Disclosure [Line Items]
Average remaining service period, in years	14 years
Projected benefit obligation	$ 1,153	$ 1,193	1,170
Accumulated Benefit Obligation at measurement date	1,154	1,194
Benefits paid	80	83
Duke Energy Progress | Pension Plan | Nonqualified Plan
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	31
Accumulated Benefit Obligation at measurement date	31
Employer contributions	3
Benefits paid	$ 3
Duke Energy Progress | Other Post-Retirement Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Average remaining service period, in years	6 years
Projected benefit obligation	$ 147	166	168
Employer contributions	13
Benefits paid	$ 16	15
Duke Energy Ohio | Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Employer contributions			2
Duke Energy Ohio | Pension Plan | Qualified Plan
Defined Benefit Plan Disclosure [Line Items]
Average remaining service period, in years	14 years
Projected benefit obligation	$ 450	502	481
Accumulated Benefit Obligation at measurement date	439	493
Benefits paid	50	34
Duke Energy Ohio | Pension Plan | Nonqualified Plan
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	3
Accumulated Benefit Obligation at measurement date	$ 3
Duke Energy Ohio | Other Post-Retirement Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Average remaining service period, in years	5 years
Projected benefit obligation	$ 25	27	29
Employer contributions	1
Benefits paid	$ 3	4
Progress Energy | Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Employer contributions			57
Progress Energy | Pension Plan | Qualified Plan
Defined Benefit Plan Disclosure [Line Items]
Average remaining service period, in years	15 years
Projected benefit obligation	$ 2,560	2,715	2,608
Accumulated Benefit Obligation at measurement date	2,529	2,684
Benefits paid	161	160
Progress Energy | Pension Plan | Nonqualified Plan
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	104
Accumulated Benefit Obligation at measurement date	104
Employer contributions	8
Benefits paid	$ 8
Progress Energy | Other Post-Retirement Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Average remaining service period, in years	6 years
Projected benefit obligation	$ 263	299	303
Employer contributions	24
Benefits paid	$ 29	28
Duke Energy Florida | Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Employer contributions			53
Duke Energy Florida | Pension Plan | Qualified Plan
Defined Benefit Plan Disclosure [Line Items]
Average remaining service period, in years	15 years
Projected benefit obligation	$ 1,392	1,507	1,424
Accumulated Benefit Obligation at measurement date	1,361	1,476
Benefits paid	81	76
Duke Energy Florida | Pension Plan | Nonqualified Plan
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	41
Accumulated Benefit Obligation at measurement date	41
Employer contributions	3
Benefits paid	$ 3
Duke Energy Florida | Other Post-Retirement Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Average remaining service period, in years	7 years
Projected benefit obligation	$ 112	130	135
Employer contributions	10
Benefits paid	$ 13	13
Duke Energy Carolinas | Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Employer contributions			7
Duke Energy Carolinas | Pension Plan | Qualified Plan
Defined Benefit Plan Disclosure [Line Items]
Average remaining service period, in years	13 years
Projected benefit obligation	$ 1,903	1,988	1,923
Accumulated Benefit Obligation at measurement date	1,904	1,989
Benefits paid	148	137
Duke Energy Carolinas | Pension Plan | Nonqualified Plan
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	12
Accumulated Benefit Obligation at measurement date	12
Employer contributions	1
Benefits paid	$ 1
Duke Energy Carolinas | Other Post-Retirement Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Average remaining service period, in years	6 years
Projected benefit obligation	$ 149	174	175
Employer contributions	3
Benefits paid	$ 19	18
Duke Energy Indiana | Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Employer contributions			2
Duke Energy Indiana | Pension Plan | Qualified Plan
Defined Benefit Plan Disclosure [Line Items]
Average remaining service period, in years	13 years
Projected benefit obligation	$ 680	715	693
Accumulated Benefit Obligation at measurement date	672	709
Benefits paid	52	49
Duke Energy Indiana | Pension Plan | Nonqualified Plan
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	2
Accumulated Benefit Obligation at measurement date	$ 2
Duke Energy Indiana | Other Post-Retirement Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Average remaining service period, in years	6 years
Projected benefit obligation	$ 54	61	64
Employer contributions	6
Benefits paid	$ 9	9
Piedmont
Defined Benefit Plan Disclosure [Line Items]
Term	3 years
Piedmont | Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Employer contributions			1
Piedmont | Pension Plan | Qualified Plan
Defined Benefit Plan Disclosure [Line Items]
Average remaining service period, in years	9 years
Projected benefit obligation	$ 273	293	292
Accumulated Benefit Obligation at measurement date	274	294
Benefits paid	28	27
Piedmont | Pension Plan | Nonqualified Plan
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	3
Accumulated Benefit Obligation at measurement date	$ 3
Piedmont | Other Post-Retirement Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Average remaining service period, in years	6 years
Projected benefit obligation	$ 27	30	$ 30
Employer contributions	1
Benefits paid	$ 2	$ 2
Liability Hedging Assets | Pension Plan | Master Trust | Subsequent Event
Defined Benefit Plan Disclosure [Line Items]
Target allocation				60.00%
Return Seeking Assets | Pension Plan | Master Trust | Subsequent Event
Defined Benefit Plan Disclosure [Line Items]
Target allocation				40.00%
Minimum | Pension Plan | Qualified Plan
Defined Benefit Plan Disclosure [Line Items]
Expected long-term rate of return on plan assets

Employee Benefit Plans (Contrib

Employee Benefit Plans (Contributions to Defined Benefit Pension Plans) (Details) - Pension Plan $ in Millions	12 Months Ended
	Dec. 31, 2019USD ($)
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	$ 77
Duke Energy Carolinas
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	7
Progress Energy
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	57
Duke Energy Progress
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	4
Duke Energy Florida
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	53
Duke Energy Ohio
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	2
Duke Energy Indiana
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	2
Piedmont
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	$ 1

Employee Benefit Plans (Compone

Employee Benefit Plans (Components of Net Periodic Pension Costs) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Pension Plan
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Amortization of regulatory asset	$ 3	$ 4	$ 4
Pension Plan | Qualified Plan
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	176	165
Service cost	168	157	158
Interest cost	220	269	317
Expected return on plan assets	(558)	(572)	(567)
Amortization of prior service credit	133	128	108
Amortization of prior service cost (credit)	(29)	(32)	(32)
Amortization of settlement charge			6
Amortization of settlement charges	9	18
Net periodic costs	(49)	(24)	(10)
Pension Plan | Duke Energy Carolinas | Qualified Plan
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	56	51
Service cost	54	49	49
Interest cost	51	62	75
Expected return on plan assets	(141)	(145)	(147)
Amortization of prior service credit	29	28	24
Amortization of prior service cost (credit)	(8)	(8)	(8)
Amortization of settlement charge			2
Amortization of settlement charges	5	9
Net periodic costs	(8)	(3)	(5)
Pension Plan | Progress Energy | Qualified Plan
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	50	48
Service cost	48	46	46
Interest cost	70	85	100
Expected return on plan assets	(187)	(190)	(178)
Amortization of prior service credit	38	41	39
Amortization of prior service cost (credit)	(2)	(3)	(3)
Amortization of settlement charge			1
Amortization of settlement charges	2	7
Net periodic costs	(29)	(12)	5
Pension Plan | Duke Energy Progress | Qualified Plan
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	29	27
Service cost	28	26	26
Interest cost	30	38	45
Expected return on plan assets	(84)	(87)	(88)
Amortization of prior service credit	18	18	15
Amortization of prior service cost (credit)	(1)	(2)	(2)
Amortization of settlement charge			1
Amortization of settlement charges	2	6
Net periodic costs	(6)		(3)
Pension Plan | Duke Energy Florida | Qualified Plan
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	21	21
Service cost	20	20	20
Interest cost	39	46	54
Expected return on plan assets	(102)	(101)	(89)
Amortization of prior service credit	20	23	24
Amortization of prior service cost (credit)	(1)	(1)	(1)
Amortization of settlement charges	1	1
Net periodic costs	(22)	(11)	8
Pension Plan | Duke Energy Ohio
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Amortization of regulatory asset	1	2	2
Pension Plan | Duke Energy Ohio | Qualified Plan
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	5	5
Service cost	5	4	4
Interest cost	13	15	18
Expected return on plan assets	(28)	(28)	(28)
Amortization of prior service credit	7	6	4
Amortization of prior service cost (credit)	(1)
Amortization of settlement charge			2
Net periodic costs	(4)	(2)
Pension Plan | Duke Energy Indiana | Qualified Plan
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	10	9
Service cost	9	8	9
Interest cost	18	22	26
Expected return on plan assets	(40)	(42)	(43)
Amortization of prior service credit	13	12	8
Amortization of prior service cost (credit)	(2)	(2)	(2)
Amortization of settlement charges		1
Net periodic costs	(1)		(2)
Pension Plan | Piedmont | Qualified Plan
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	6	6
Service cost	6	5	5
Interest cost	7	9	10
Expected return on plan assets	(20)	(21)	(22)
Amortization of prior service credit	10	9	8
Amortization of prior service cost (credit)	(9)	(9)	(9)
Amortization of settlement charges	1	1
Net periodic costs	(5)	(5)	(8)
Other Post-Retirement Benefit Plans
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	4	4	4
Interest cost	18	23	30
Expected return on plan assets	(11)	(13)	(12)
Amortization of prior service credit	2	2	4
Amortization of prior service cost (credit)	(13)	(14)	(19)
Net periodic costs		2	7
Amortization of regulatory asset	5	6	6
Other Post-Retirement Benefit Plans | Duke Energy Carolinas
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	1	1	1
Interest cost	4	5	7
Expected return on plan assets	(7)	(8)	(7)
Amortization of prior service credit			2
Amortization of prior service cost (credit)	(4)	(4)	(5)
Net periodic costs	(6)	(6)	(2)
Other Post-Retirement Benefit Plans | Progress Energy
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	1	1	1
Interest cost	7	10	12
Amortization of prior service credit	1	1	1
Amortization of prior service cost (credit)	(2)	(3)	(8)
Net periodic costs	7	9	6
Other Post-Retirement Benefit Plans | Duke Energy Progress
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Interest cost	4	5	7
Amortization of prior service cost (credit)	(1)	(1)	(1)
Net periodic costs	3	4	6
Other Post-Retirement Benefit Plans | Duke Energy Florida
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost			1
Interest cost	3	4	5
Amortization of prior service credit	1	1	1
Amortization of prior service cost (credit)	(1)	(2)	(7)
Net periodic costs	3	3
Other Post-Retirement Benefit Plans | Duke Energy Ohio
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Interest cost	1	1	1
Amortization of prior service cost (credit)	(1)	(1)	(1)
Amortization of regulatory asset	1	1	2
Other Post-Retirement Benefit Plans | Duke Energy Indiana
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	1	1	1
Interest cost	1	2	3
Amortization of prior service credit	4	4	4
Amortization of prior service cost (credit)	(1)	(1)	(1)
Net periodic costs	5	6	7
Other Post-Retirement Benefit Plans | Piedmont
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Interest cost	1	1	1
Expected return on plan assets	(2)	(2)	(1)
Amortization of prior service cost (credit)	(2)	(2)	(2)
Net periodic costs	$ (3)	$ (3)	$ (2)

Employee Benefit Plans (Amounts

Employee Benefit Plans (Amounts Recognized in Accumulated Other Comprehensive Income and Regulatory Assets and Liabilities) (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Amounts Recognized in Accumulated Other Comprehensive Loss (Income) [Abstract]
Net amount recognized in accumulated other comprehensive income	[1]	$ (7)	$ (6)	$ (9)
Progress Energy
Amounts Recognized in Accumulated Other Comprehensive Loss (Income) [Abstract]
Net amount recognized in accumulated other comprehensive income		(1)	1	$ (2)
Pension Plan | Qualified Plan
Amounts Recognized in Regulatory Assets and Liabilities [Abstract]
Regulatory assets, net decrease		(261)	(62)
Amounts Recognized in Accumulated Other Comprehensive Loss (Income) [Abstract]
Deferred income tax expense		1	2
Amortization of prior year actuarial gain		(8)	(11)
Amortization of prior year service credit		1	1
Net amount recognized in accumulated other comprehensive income		(6)	(8)
Pension Plan | Duke Energy Carolinas | Qualified Plan
Amounts Recognized in Regulatory Assets and Liabilities [Abstract]
Regulatory assets, net decrease		(57)	(39)
Pension Plan | Progress Energy | Qualified Plan
Amounts Recognized in Regulatory Assets and Liabilities [Abstract]
Regulatory assets, net decrease		(128)	(26)
Amounts Recognized in Accumulated Other Comprehensive Loss (Income) [Abstract]
Deferred income tax expense			1
Amortization of prior year actuarial gain		(1)	(1)
Net amount recognized in accumulated other comprehensive income		(1)
Pension Plan | Duke Energy Progress | Qualified Plan
Amounts Recognized in Regulatory Assets and Liabilities [Abstract]
Regulatory assets, net decrease		(31)	(30)
Pension Plan | Duke Energy Florida | Qualified Plan
Amounts Recognized in Regulatory Assets and Liabilities [Abstract]
Regulatory assets, net decrease		(97)	4
Amounts Recognized in Accumulated Other Comprehensive Loss (Income) [Abstract]
Deferred income tax expense			1
Amortization of prior year actuarial gain			(3)
Net amount recognized in accumulated other comprehensive income			(2)
Pension Plan | Duke Energy Ohio | Qualified Plan
Amounts Recognized in Regulatory Assets and Liabilities [Abstract]
Regulatory assets, net decrease		(17)	(2)
Pension Plan | Duke Energy Indiana | Qualified Plan
Amounts Recognized in Regulatory Assets and Liabilities [Abstract]
Regulatory assets, net decrease		(19)	5
Pension Plan | Piedmont | Qualified Plan
Amounts Recognized in Regulatory Assets and Liabilities [Abstract]
Regulatory assets, net decrease		(5)	(1)
Other Post-Retirement Benefit Plans
Amounts Recognized in Regulatory Assets and Liabilities [Abstract]
Regulatory assets, net decrease		(15)	9
Regulatory liabilities, net increase		23	(10)
Amounts Recognized in Accumulated Other Comprehensive Loss (Income) [Abstract]
Amortization of prior year actuarial gain		(1)
Amortization of prior year service credit			1
Net amount recognized in accumulated other comprehensive income		(1)	1
Other Post-Retirement Benefit Plans | Duke Energy Carolinas
Amounts Recognized in Regulatory Assets and Liabilities [Abstract]
Regulatory liabilities, net increase		12	(7)
Other Post-Retirement Benefit Plans | Progress Energy
Amounts Recognized in Regulatory Assets and Liabilities [Abstract]
Regulatory assets, net decrease		(18)	9
Other Post-Retirement Benefit Plans | Duke Energy Progress
Amounts Recognized in Regulatory Assets and Liabilities [Abstract]
Regulatory assets, net decrease		(9)	6
Other Post-Retirement Benefit Plans | Duke Energy Florida
Amounts Recognized in Regulatory Assets and Liabilities [Abstract]
Regulatory assets, net decrease		(9)	3
Other Post-Retirement Benefit Plans | Duke Energy Ohio
Amounts Recognized in Regulatory Assets and Liabilities [Abstract]
Regulatory assets, net decrease		4
Regulatory liabilities, net increase		4
Other Post-Retirement Benefit Plans | Duke Energy Indiana
Amounts Recognized in Regulatory Assets and Liabilities [Abstract]
Regulatory assets, net decrease		(4)	(4)
Regulatory liabilities, net increase		1	$ (1)
Other Post-Retirement Benefit Plans | Piedmont
Amounts Recognized in Regulatory Assets and Liabilities [Abstract]
Regulatory liabilities, net increase		$ 2
[1]	Net of income tax impacts of approximately $17 million and $35 million for the years ended December 31, 2021, and 2020, respectively. Tax impacts are immaterial for other periods presented.

Employee Benefit Plans (Project

Employee Benefit Plans (Projected Benefit Obligations Reconciliation of Funded Status to Net Amount Recognized) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Pension Plan
Change in Fair Value of Plan Assets [Rollforward]
Employer contributions			$ 77
Pension Plan | Duke Energy Carolinas
Change in Fair Value of Plan Assets [Rollforward]
Employer contributions			7
Pension Plan | Progress Energy
Change in Fair Value of Plan Assets [Rollforward]
Employer contributions			57
Pension Plan | Duke Energy Progress
Change in Fair Value of Plan Assets [Rollforward]
Employer contributions			4
Pension Plan | Duke Energy Florida
Change in Fair Value of Plan Assets [Rollforward]
Employer contributions			53
Pension Plan | Duke Energy Ohio
Change in Fair Value of Plan Assets [Rollforward]
Employer contributions			2
Pension Plan | Duke Energy Indiana
Change in Fair Value of Plan Assets [Rollforward]
Employer contributions			2
Pension Plan | Piedmont
Change in Fair Value of Plan Assets [Rollforward]
Employer contributions			1
Pension Plan | Qualified Plan
Change in Projected Benefit Obligation [Rollforward]
Obligation at prior measurement date	$ 8,634	$ 8,321
Service cost	168	157	158
Interest cost	220	269	317
Actuarial gain	(200)	433
Benefits paid	(615)	(541)
Benefits paid – settlements		(5)
Obligation at measurement date	8,207	8,634	8,321
Accumulated Benefit Obligation at measurement date	8,144	8,577
Change in Fair Value of Plan Assets [Rollforward]
Plan assets at prior measurement date	9,337	8,910
Actual return on plan assets	513	973
Benefits paid	(615)	(541)
Benefits paid – settlements		(5)
Plan assets at measurement date	9,235	9,337	8,910
Funded status of plan	1,028	703
Pension Plan | Qualified Plan | Duke Energy Carolinas
Change in Projected Benefit Obligation [Rollforward]
Obligation at prior measurement date	1,988	1,923
Service cost	54	49	49
Interest cost	51	62	75
Actuarial gain	(42)	83
Benefits paid	(148)	(137)
Transfers		8
Obligation at measurement date	1,903	1,988	1,923
Accumulated Benefit Obligation at measurement date	1,904	1,989
Change in Fair Value of Plan Assets [Rollforward]
Plan assets at prior measurement date	2,381	2,263
Actual return on plan assets	132	247
Benefits paid	(148)	(137)
Transfers		8
Plan assets at measurement date	2,365	2,381	2,263
Funded status of plan	462	393
Pension Plan | Qualified Plan | Progress Energy
Change in Projected Benefit Obligation [Rollforward]
Obligation at prior measurement date	2,715	2,608
Service cost	48	46	46
Interest cost	70	85	100
Actuarial gain	(108)	144
Benefits paid	(161)	(160)
Transfers	(4)	(8)
Obligation at measurement date	2,560	2,715	2,608
Accumulated Benefit Obligation at measurement date	2,529	2,684
Change in Fair Value of Plan Assets [Rollforward]
Plan assets at prior measurement date	3,049	2,898
Actual return on plan assets	169	319
Benefits paid	(161)	(160)
Transfers	(4)	(8)
Plan assets at measurement date	3,053	3,049	2,898
Funded status of plan	493	334
Pension Plan | Qualified Plan | Duke Energy Progress
Change in Projected Benefit Obligation [Rollforward]
Obligation at prior measurement date	1,193	1,170
Service cost	28	26	26
Interest cost	30	38	45
Actuarial gain	(18)	50
Benefits paid	(80)	(83)
Transfers		(8)
Obligation at measurement date	1,153	1,193	1,170
Accumulated Benefit Obligation at measurement date	1,154	1,194
Change in Fair Value of Plan Assets [Rollforward]
Plan assets at prior measurement date	1,422	1,364
Actual return on plan assets	79	149
Benefits paid	(80)	(83)
Transfers		(8)
Plan assets at measurement date	1,421	1,422	1,364
Funded status of plan	268	229
Pension Plan | Qualified Plan | Duke Energy Florida
Change in Projected Benefit Obligation [Rollforward]
Obligation at prior measurement date	1,507	1,424
Service cost	20	20	20
Interest cost	39	46	54
Actuarial gain	(89)	93
Benefits paid	(81)	(76)
Transfers	(4)
Obligation at measurement date	1,392	1,507	1,424
Accumulated Benefit Obligation at measurement date	1,361	1,476
Change in Fair Value of Plan Assets [Rollforward]
Plan assets at prior measurement date	1,605	1,515
Actual return on plan assets	90	166
Benefits paid	(81)	(76)
Transfers	(4)
Plan assets at measurement date	1,610	1,605	1,515
Funded status of plan	218	98
Pension Plan | Qualified Plan | Duke Energy Ohio
Change in Projected Benefit Obligation [Rollforward]
Obligation at prior measurement date	502	481
Service cost	5	4	4
Interest cost	13	15	18
Actuarial gain	(10)	21
Benefits paid	(50)	(34)
Transfers	(10)	15
Obligation at measurement date	450	502	481
Accumulated Benefit Obligation at measurement date	439	493
Change in Fair Value of Plan Assets [Rollforward]
Plan assets at prior measurement date	472	443
Actual return on plan assets	26	48
Benefits paid	(50)	(34)
Transfers	(10)	15
Plan assets at measurement date	438	472	443
Funded status of plan	(12)	(30)
Pension Plan | Qualified Plan | Duke Energy Indiana
Change in Projected Benefit Obligation [Rollforward]
Obligation at prior measurement date	715	693
Service cost	9	8	9
Interest cost	18	22	26
Actuarial gain	(10)	46
Benefits paid	(52)	(49)
Benefits paid – settlements		(5)
Obligation at measurement date	680	715	693
Accumulated Benefit Obligation at measurement date	672	709
Change in Fair Value of Plan Assets [Rollforward]
Plan assets at prior measurement date	684	667
Actual return on plan assets	37	71
Benefits paid	(52)	(49)
Benefits paid – settlements		(5)
Plan assets at measurement date	669	684	667
Funded status of plan	(11)	(31)
Pension Plan | Qualified Plan | Piedmont
Change in Projected Benefit Obligation [Rollforward]
Obligation at prior measurement date	293	292
Service cost	6	5	5
Interest cost	7	9	10
Actuarial gain	(5)	14
Benefits paid	(28)	(27)
Obligation at measurement date	273	293	292
Accumulated Benefit Obligation at measurement date	274	294
Change in Fair Value of Plan Assets [Rollforward]
Plan assets at prior measurement date	343	335
Actual return on plan assets	19	35
Benefits paid	(28)	(27)
Plan assets at measurement date	334	343	335
Funded status of plan	61	50
Other Post-Retirement Benefit Plans
Change in Projected Benefit Obligation [Rollforward]
Obligation at prior measurement date	709	723
Service cost	4	4	4
Interest cost	18	23	30
Plan participants' contributions	14	15
Actuarial gain	(47)	19
Benefits paid	(73)	(75)
Obligation at measurement date	625	709	723
Change in Fair Value of Plan Assets [Rollforward]
Plan assets at prior measurement date	237	220
Employer contributions	18
Actual return on plan assets	15	24
Benefits paid	(73)	(75)
Plan participants' contributions	14	15
Employer contributions		53
Plan assets at measurement date	211	237	220
Funded status of plan	(414)	(472)
Other Post-Retirement Benefit Plans | Duke Energy Carolinas
Change in Projected Benefit Obligation [Rollforward]
Obligation at prior measurement date	174	175
Service cost	1	1	1
Interest cost	4	5	7
Plan participants' contributions	3	3
Actuarial gain	(14)	8
Benefits paid	(19)	(18)
Obligation at measurement date	149	174	175
Change in Fair Value of Plan Assets [Rollforward]
Plan assets at prior measurement date	139	130
Employer contributions	3
Actual return on plan assets	9	14
Benefits paid	(19)	(18)
Plan participants' contributions	3	3
Employer contributions		10
Plan assets at measurement date	135	139	130
Funded status of plan	(14)	(35)
Other Post-Retirement Benefit Plans | Progress Energy
Change in Projected Benefit Obligation [Rollforward]
Obligation at prior measurement date	299	303
Service cost	1	1	1
Interest cost	7	10	12
Plan participants' contributions	5	5
Actuarial gain	(20)	8
Benefits paid	(29)	(28)
Obligation at measurement date	263	299	303
Change in Fair Value of Plan Assets [Rollforward]
Plan assets at prior measurement date	(1)	(1)
Employer contributions	24
Benefits paid	(29)	(28)
Plan participants' contributions	5	5
Employer contributions		23
Plan assets at measurement date	(1)	(1)	(1)
Funded status of plan	(264)	(300)
Other Post-Retirement Benefit Plans | Duke Energy Progress
Change in Projected Benefit Obligation [Rollforward]
Obligation at prior measurement date	166	168
Interest cost	4	5	7
Plan participants' contributions	3	3
Actuarial gain	(10)	5
Benefits paid	(16)	(15)
Obligation at measurement date	147	166	168
Change in Fair Value of Plan Assets [Rollforward]
Plan assets at prior measurement date	(2)	(1)
Employer contributions	13
Benefits paid	(16)	(15)
Plan participants' contributions	3	3
Employer contributions		11
Plan assets at measurement date	(2)	(2)	(1)
Funded status of plan	(149)	(168)
Other Post-Retirement Benefit Plans | Duke Energy Florida
Change in Projected Benefit Obligation [Rollforward]
Obligation at prior measurement date	130	135
Service cost			1
Interest cost	3	4	5
Plan participants' contributions	2	2
Actuarial gain	(10)	2
Benefits paid	(13)	(13)
Obligation at measurement date	112	130	135
Change in Fair Value of Plan Assets [Rollforward]
Plan assets at prior measurement date	(1)
Employer contributions	10
Benefits paid	(13)	(13)
Plan participants' contributions	2	2
Employer contributions		10
Plan assets at measurement date	(2)	(1)
Funded status of plan	(114)	(131)
Other Post-Retirement Benefit Plans | Duke Energy Ohio
Change in Projected Benefit Obligation [Rollforward]
Obligation at prior measurement date	27	29
Interest cost	1	1	1
Plan participants' contributions	1	1
Actuarial gain	(1)
Benefits paid	(3)	(4)
Obligation at measurement date	25	27	29
Change in Fair Value of Plan Assets [Rollforward]
Plan assets at prior measurement date	9	9
Employer contributions	1
Actual return on plan assets	1
Benefits paid	(3)	(4)
Plan participants' contributions	1	1
Employer contributions		3
Plan assets at measurement date	9	9	9
Funded status of plan	(16)	(18)
Other Post-Retirement Benefit Plans | Duke Energy Indiana
Change in Projected Benefit Obligation [Rollforward]
Obligation at prior measurement date	61	64
Service cost	1	1	1
Interest cost	1	2	3
Plan participants' contributions	2	2
Actuarial gain	(2)	1
Benefits paid	(9)	(9)
Obligation at measurement date	54	61	64
Change in Fair Value of Plan Assets [Rollforward]
Plan assets at prior measurement date	7	5
Employer contributions	6
Actual return on plan assets		1
Benefits paid	(9)	(9)
Plan participants' contributions	2	2
Employer contributions		8
Plan assets at measurement date	6	7	5
Funded status of plan	(48)	(54)
Other Post-Retirement Benefit Plans | Piedmont
Change in Projected Benefit Obligation [Rollforward]
Obligation at prior measurement date	30	30
Interest cost	1	1	1
Actuarial gain	(2)	1
Benefits paid	(2)	(2)
Obligation at measurement date	27	30	30
Change in Fair Value of Plan Assets [Rollforward]
Plan assets at prior measurement date	37	34
Employer contributions	1
Actual return on plan assets	3	4
Benefits paid	(2)	(2)
Employer contributions		1
Plan assets at measurement date	39	37	$ 34
Funded status of plan	$ 12	$ 7

Employee Benefit Plans (Amoun_2

Employee Benefit Plans (Amounts Recognized in Consolidated Balance Sheets) (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Amounts Recognized in Consolidated Balance Sheets [Abstract]
Noncurrent pension liability	$ 855	$ 969
Regulatory assets	14,637	14,062
Regulatory liabilities	17,363	16,406
Duke Energy Carolinas
Amounts Recognized in Consolidated Balance Sheets [Abstract]
Noncurrent pension liability	50	73
Regulatory assets	3,479	3,469
Regulatory liabilities	7,685	7,008
Progress Energy
Amounts Recognized in Consolidated Balance Sheets [Abstract]
Noncurrent pension liability	417	505
Regulatory assets	6,939	6,533
Regulatory liabilities	6,044	5,691
Duke Energy Progress
Amounts Recognized in Consolidated Balance Sheets [Abstract]
Noncurrent pension liability	221	242
Regulatory assets	4,651	4,468
Regulatory liabilities	5,249	4,924
Duke Energy Florida
Amounts Recognized in Consolidated Balance Sheets [Abstract]
Noncurrent pension liability	166	231
Regulatory assets	2,288	2,064
Regulatory liabilities	796	768
Duke Energy Ohio
Amounts Recognized in Consolidated Balance Sheets [Abstract]
Noncurrent pension liability	109	113
Regulatory assets	707	649
Regulatory liabilities	801	813
Duke Energy Indiana
Amounts Recognized in Consolidated Balance Sheets [Abstract]
Noncurrent pension liability	167	171
Regulatory assets	1,555	1,328
Regulatory liabilities	1,692	1,738
Piedmont
Amounts Recognized in Consolidated Balance Sheets [Abstract]
Noncurrent pension liability	7	8
Regulatory assets	457	455
Regulatory liabilities	1,114	1,132
Pension Plan | Qualified Plan
Amounts Recognized in Consolidated Balance Sheets [Abstract]
Prefunded pension	1,071	780
Noncurrent pension liability	43	77
Net amount recognized	(1,028)	(703)
Regulatory assets	1,649	1,910
Accumulated other comprehensive (income) loss
Deferred income tax asset	(20)	(21)
Prior service credit	(1)	(2)
Net actuarial loss (gain)	92	100
Net amount recognized in accumulated other comprehensive income (loss)	71	77
Pension Plan | Duke Energy Carolinas | Qualified Plan
Amounts Recognized in Consolidated Balance Sheets [Abstract]
Prefunded pension	462	393
Net amount recognized	(462)	(393)
Regulatory assets	324	381
Pension Plan | Progress Energy | Qualified Plan
Amounts Recognized in Consolidated Balance Sheets [Abstract]
Prefunded pension	494	379
Noncurrent pension liability	1	45
Net amount recognized	(493)	(334)
Regulatory assets	563	691
Accumulated other comprehensive (income) loss
Net actuarial loss (gain)	1	2
Net amount recognized in accumulated other comprehensive income (loss)	1	2
Pension Plan | Duke Energy Progress | Qualified Plan
Amounts Recognized in Consolidated Balance Sheets [Abstract]
Prefunded pension	268	229
Net amount recognized	(268)	(229)
Regulatory assets	252	283
Pension Plan | Duke Energy Florida | Qualified Plan
Amounts Recognized in Consolidated Balance Sheets [Abstract]
Prefunded pension	219	143
Noncurrent pension liability	1	45
Net amount recognized	(218)	(98)
Regulatory assets	311	408
Pension Plan | Duke Energy Ohio | Qualified Plan
Amounts Recognized in Consolidated Balance Sheets [Abstract]
Prefunded pension	74	58
Noncurrent pension liability	86	88
Net amount recognized	12	30
Regulatory assets	93	110
Pension Plan | Duke Energy Indiana | Qualified Plan
Amounts Recognized in Consolidated Balance Sheets [Abstract]
Prefunded pension	100	79
Noncurrent pension liability	111	110
Net amount recognized	11	31
Regulatory assets	190	209
Pension Plan | Piedmont | Qualified Plan
Amounts Recognized in Consolidated Balance Sheets [Abstract]
Prefunded pension	61	50
Net amount recognized	(61)	(50)
Regulatory assets	75	80
Other Post-Retirement Benefit Plans
Amounts Recognized in Consolidated Balance Sheets [Abstract]
Prefunded pension	12	8
Current pension liability	9	9
Noncurrent pension liability	417	471
Net amount recognized	414	472
Regulatory assets	129	144
Regulatory liabilities	162	139
Accumulated other comprehensive (income) loss
Deferred income tax liability	3	3
Prior service credit	(1)	(1)
Net actuarial loss (gain)	(14)	(13)
Net amount recognized in accumulated other comprehensive income (loss)	(12)	(11)
Other Post-Retirement Benefit Plans | Duke Energy Carolinas
Amounts Recognized in Consolidated Balance Sheets [Abstract]
Noncurrent pension liability	14	35
Net amount recognized	14	35
Regulatory liabilities	44	32
Other Post-Retirement Benefit Plans | Progress Energy
Amounts Recognized in Consolidated Balance Sheets [Abstract]
Current pension liability	5	6
Noncurrent pension liability	259	294
Net amount recognized	264	300
Regulatory assets	126	144
Other Post-Retirement Benefit Plans | Duke Energy Progress
Amounts Recognized in Consolidated Balance Sheets [Abstract]
Current pension liability	3	4
Noncurrent pension liability	146	164
Net amount recognized	149	168
Regulatory assets	79	88
Other Post-Retirement Benefit Plans | Duke Energy Florida
Amounts Recognized in Consolidated Balance Sheets [Abstract]
Current pension liability	2	2
Noncurrent pension liability	112	129
Net amount recognized	114	131
Regulatory assets	47	56
Other Post-Retirement Benefit Plans | Duke Energy Ohio
Amounts Recognized in Consolidated Balance Sheets [Abstract]
Prefunded pension	1	1
Current pension liability	1	2
Noncurrent pension liability	16	17
Net amount recognized	16	18
Regulatory assets	4
Regulatory liabilities	21	17
Other Post-Retirement Benefit Plans | Duke Energy Indiana
Amounts Recognized in Consolidated Balance Sheets [Abstract]
Noncurrent pension liability	48	54
Net amount recognized	48	54
Regulatory assets	28	32
Regulatory liabilities	63	62
Other Post-Retirement Benefit Plans | Piedmont
Amounts Recognized in Consolidated Balance Sheets [Abstract]
Prefunded pension	12	7
Net amount recognized	(12)	(7)
Regulatory liabilities	$ 5	$ 3

Employee Benefit Plans (Informa

Employee Benefit Plans (Information For Plans with Accumulated Benefit Obligation in Excess of Plan Assets) (Details) - Pension Plan - Qualified Plan - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Information For Plans With Accumulated Benefit Obligation In Excess Of Plan Assets [Abstract]
Projected benefit obligation		$ 4,914
Accumulated benefit obligation		4,856
Fair value of plan assets		4,837
Progress Energy
Information For Plans With Accumulated Benefit Obligation In Excess Of Plan Assets [Abstract]
Projected benefit obligation		828
Accumulated benefit obligation		796
Fair value of plan assets		783
Duke Energy Florida
Information For Plans With Accumulated Benefit Obligation In Excess Of Plan Assets [Abstract]
Projected benefit obligation		828
Accumulated benefit obligation		796
Fair value of plan assets		783
Duke Energy Ohio
Information For Plans With Accumulated Benefit Obligation In Excess Of Plan Assets [Abstract]
Projected benefit obligation	$ 153	184
Accumulated benefit obligation	143	176
Fair value of plan assets	67	96
Duke Energy Indiana
Information For Plans With Accumulated Benefit Obligation In Excess Of Plan Assets [Abstract]
Projected benefit obligation	284	293
Accumulated benefit obligation	275	285
Fair value of plan assets	$ 173	$ 183

Employee Benefit Plans (Assumpt

Employee Benefit Plans (Assumptions Used For Pension Benefits Accounting) (Details)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Pension Plan | Qualified Plan
Benefit Obligations [Abstract]
Discount rate	2.90%	2.60%	3.30%
Interest crediting rate	4.00%	4.00%	4.00%
Net Periodic Benefit Cost [Abstract]
Discount rate	2.60%	3.30%	4.30%
Expected long-term rate of return on plan assets	6.50%	6.85%	6.85%
Pension Plan | Minimum | Qualified Plan
Benefit Obligations [Abstract]
Salary increase	3.50%	3.50%	3.50%
Net Periodic Benefit Cost [Abstract]
Salary increase	3.50%	3.50%	3.50%
Expected long-term rate of return on plan assets
Pension Plan | Maximum | Qualified Plan
Benefit Obligations [Abstract]
Salary increase	4.00%	4.00%	4.00%
Net Periodic Benefit Cost [Abstract]
Salary increase	4.00%	4.00%	4.00%
Other Post-Retirement Benefit Plans
Benefit Obligations [Abstract]
Discount rate	2.90%	2.60%	3.30%
Net Periodic Benefit Cost [Abstract]
Discount rate	2.60%	3.30%	4.30%
Expected long-term rate of return on plan assets	6.50%	6.85%	6.85%

Employee Benefit Plans (Assumed

Employee Benefit Plans (Assumed Health Care Cost Trend Rates) (Details)	Dec. 31, 2021	Dec. 31, 2020
Defined Benefit Plan Disclosure [Line Items]
Health care cost trend rate assumed for next year	6.25%	6.25%
Rate to which the cost trend is assumed to decline (the ultimate trend rate)	4.75%	4.75%

Employee Benefit Plans (Expecte

Employee Benefit Plans (Expected Benefit Payments) (Details) $ in Millions	Dec. 31, 2021USD ($)
Pension Plan | Qualified Plan
Defined Benefit Plan, Expected Future Benefit Payment [Abstract]
2022	$ 652
2023	653
2024	645
2025	632
2026	605
2027-2031	2,705
Pension Plan | Duke Energy Carolinas | Qualified Plan
Defined Benefit Plan, Expected Future Benefit Payment [Abstract]
2022	174
2023	173
2024	171
2025	168
2026	155
2027-2031	655
Pension Plan | Progress Energy | Qualified Plan
Defined Benefit Plan, Expected Future Benefit Payment [Abstract]
2022	177
2023	180
2024	181
2025	180
2026	176
2027-2031	818
Pension Plan | Duke Energy Progress | Qualified Plan
Defined Benefit Plan, Expected Future Benefit Payment [Abstract]
2022	95
2023	97
2024	96
2025	94
2026	90
2027-2031	389
Pension Plan | Duke Energy Florida | Qualified Plan
Defined Benefit Plan, Expected Future Benefit Payment [Abstract]
2022	81
2023	82
2024	84
2025	85
2026	86
2027-2031	426
Pension Plan | Duke Energy Ohio | Qualified Plan
Defined Benefit Plan, Expected Future Benefit Payment [Abstract]
2022	37
2023	36
2024	35
2025	34
2026	33
2027-2031	149
Pension Plan | Duke Energy Indiana | Qualified Plan
Defined Benefit Plan, Expected Future Benefit Payment [Abstract]
2022	48
2023	48
2024	47
2025	47
2026	45
2027-2031	218
Pension Plan | Piedmont | Qualified Plan
Defined Benefit Plan, Expected Future Benefit Payment [Abstract]
2022	27
2023	24
2024	23
2025	20
2026	21
2027-2031	85
Other Post-Retirement Benefit Plans
Defined Benefit Plan, Expected Future Benefit Payment [Abstract]
2022	70
2023	62
2024	58
2025	54
2026	50
2027-2031	207
Other Post-Retirement Benefit Plans | Duke Energy Carolinas
Defined Benefit Plan, Expected Future Benefit Payment [Abstract]
2022	17
2023	15
2024	14
2025	13
2026	12
2027-2031	50
Other Post-Retirement Benefit Plans | Progress Energy
Defined Benefit Plan, Expected Future Benefit Payment [Abstract]
2022	26
2023	25
2024	23
2025	22
2026	21
2027-2031	87
Other Post-Retirement Benefit Plans | Duke Energy Progress
Defined Benefit Plan, Expected Future Benefit Payment [Abstract]
2022	15
2023	14
2024	13
2025	12
2026	12
2027-2031	49
Other Post-Retirement Benefit Plans | Duke Energy Florida
Defined Benefit Plan, Expected Future Benefit Payment [Abstract]
2022	12
2023	11
2024	11
2025	10
2026	9
2027-2031	38
Other Post-Retirement Benefit Plans | Duke Energy Ohio
Defined Benefit Plan, Expected Future Benefit Payment [Abstract]
2022	3
2023	3
2024	3
2025	2
2026	2
2027-2031	8
Other Post-Retirement Benefit Plans | Duke Energy Indiana
Defined Benefit Plan, Expected Future Benefit Payment [Abstract]
2022	7
2023	6
2024	6
2025	5
2026	5
2027-2031	19
Other Post-Retirement Benefit Plans | Piedmont
Defined Benefit Plan, Expected Future Benefit Payment [Abstract]
2022	2
2023	2
2024	2
2025	2
2026	2
2027-2031	$ 10

Employee Benefit Plans (Target

Employee Benefit Plans (Target and Actual Asset Allocations) (Details)	Dec. 31, 2021	Dec. 31, 2020
Master Trust
Defined Benefit Plan Disclosure [Line Items]
Target allocation	100.00%
Actual asset allocation	100.00%	100.00%
Master Trust | Global equity securities
Defined Benefit Plan Disclosure [Line Items]
Target allocation	27.00%
Actual asset allocation	24.00%	30.00%
Master Trust | Global private equity securities
Defined Benefit Plan Disclosure [Line Items]
Target allocation	1.00%
Actual asset allocation	1.00%	1.00%
Master Trust | Debt securities
Defined Benefit Plan Disclosure [Line Items]
Target allocation	62.00%
Actual asset allocation	62.00%	55.00%
Master Trust | Return seeking debt securities
Defined Benefit Plan Disclosure [Line Items]
Target allocation	4.00%
Actual asset allocation	4.00%	5.00%
Master Trust | Hedge funds
Defined Benefit Plan Disclosure [Line Items]
Target allocation	2.00%
Actual asset allocation	3.00%	3.00%
Master Trust | Real estate and cash
Defined Benefit Plan Disclosure [Line Items]
Target allocation	4.00%
Actual asset allocation	6.00%	6.00%
OPEB
Defined Benefit Plan Disclosure [Line Items]
Target allocation	100.00%
Actual asset allocation	100.00%	100.00%
OPEB | U.S. equity securities
Defined Benefit Plan Disclosure [Line Items]
Target allocation	30.00%
Actual asset allocation	19.00%	36.00%
OPEB | Non-U.S. equity securities
Defined Benefit Plan Disclosure [Line Items]
Target allocation	5.00%
Actual asset allocation	5.00%	6.00%
OPEB | Debt securities
Defined Benefit Plan Disclosure [Line Items]
Target allocation	45.00%
Actual asset allocation	18.00%	42.00%
OPEB | Real estate
Defined Benefit Plan Disclosure [Line Items]
Target allocation	2.00%
Actual asset allocation	3.00%	2.00%
OPEB | Cash
Defined Benefit Plan Disclosure [Line Items]
Target allocation	18.00%
Actual asset allocation	55.00%	14.00%

Employee Benefit Plans (Fair Va

Employee Benefit Plans (Fair Value Measurements of Plan Assets - Master Retirement Trust) (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Level 3
Defined Benefit Plan Disclosure [Line Items]
Total assets	$ 95		$ 11
Master Trust
Defined Benefit Plan Disclosure [Line Items]
Total assets	9,352	$ 9,479
Master Trust | Level 1
Defined Benefit Plan Disclosure [Line Items]
Total assets	2,975	3,541
Master Trust | Level 2
Defined Benefit Plan Disclosure [Line Items]
Total assets	6,038	5,603
Master Trust | Level 3
Defined Benefit Plan Disclosure [Line Items]
Total assets	95
Master Trust | Not Categorized
Defined Benefit Plan Disclosure [Line Items]
Total assets	244	335
Master Trust | Equity securities
Defined Benefit Plan Disclosure [Line Items]
Total assets	2,575	3,202
Master Trust | Equity securities | Level 1
Defined Benefit Plan Disclosure [Line Items]
Total assets	2,547	3,162
Master Trust | Equity securities | Not Categorized
Defined Benefit Plan Disclosure [Line Items]
Total assets	28	40
Master Trust | Corporate debt securities
Defined Benefit Plan Disclosure [Line Items]
Total assets	4,189	4,162
Master Trust | Corporate debt securities | Level 2
Defined Benefit Plan Disclosure [Line Items]
Total assets	4,189	4,162
Master Trust | Short-term investment funds
Defined Benefit Plan Disclosure [Line Items]
Total assets	382	397
Master Trust | Short-term investment funds | Level 1
Defined Benefit Plan Disclosure [Line Items]
Total assets	272	247
Master Trust | Short-term investment funds | Level 2
Defined Benefit Plan Disclosure [Line Items]
Total assets	110	150
Master Trust | Partnership interests
Defined Benefit Plan Disclosure [Line Items]
Total assets	95	97
Master Trust | Partnership interests | Level 3
Defined Benefit Plan Disclosure [Line Items]
Total assets	95
Master Trust | Partnership interests | Not Categorized
Defined Benefit Plan Disclosure [Line Items]
Total assets		97
Master Trust | Hedge funds
Defined Benefit Plan Disclosure [Line Items]
Total assets	216	198
Master Trust | Hedge funds | Not Categorized
Defined Benefit Plan Disclosure [Line Items]
Total assets	216	198
Master Trust | U.S. government bonds
Defined Benefit Plan Disclosure [Line Items]
Total assets	1,618	1,164
Master Trust | U.S. government bonds | Level 2
Defined Benefit Plan Disclosure [Line Items]
Total assets	1,618	1,164
Master Trust | Governments bonds – foreign
Defined Benefit Plan Disclosure [Line Items]
Total assets	78	73
Master Trust | Governments bonds – foreign | Level 2
Defined Benefit Plan Disclosure [Line Items]
Total assets	78	73
Master Trust | Cash
Defined Benefit Plan Disclosure [Line Items]
Total assets	144	98
Master Trust | Cash | Level 1
Defined Benefit Plan Disclosure [Line Items]
Total assets	144	98
Master Trust | Government and commercial mortgage backed securities
Defined Benefit Plan Disclosure [Line Items]
Total assets	2
Master Trust | Government and commercial mortgage backed securities | Level 2
Defined Benefit Plan Disclosure [Line Items]
Total assets	2
Master Trust | Net pending transactions and other investments
Defined Benefit Plan Disclosure [Line Items]
Total assets	53	88
Master Trust | Net pending transactions and other investments | Level 1
Defined Benefit Plan Disclosure [Line Items]
Total assets	12	34
Master Trust | Net pending transactions and other investments | Level 2
Defined Benefit Plan Disclosure [Line Items]
Total assets	41	54
OPEB
Defined Benefit Plan Disclosure [Line Items]
Total assets	45	48
OPEB | Level 2
Defined Benefit Plan Disclosure [Line Items]
Total assets	45	48
OPEB | Equity securities
Defined Benefit Plan Disclosure [Line Items]
Total assets	18	23
OPEB | Equity securities | Level 2
Defined Benefit Plan Disclosure [Line Items]
Total assets	18	23
OPEB | Real estate
Defined Benefit Plan Disclosure [Line Items]
Total assets	2	1
OPEB | Real estate | Level 2
Defined Benefit Plan Disclosure [Line Items]
Total assets	2	1
OPEB | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Total assets	14	5
OPEB | Cash and cash equivalents | Level 2
Defined Benefit Plan Disclosure [Line Items]
Total assets	14	5
OPEB | Debt securities
Defined Benefit Plan Disclosure [Line Items]
Total assets	11	19
OPEB | Debt securities | Level 2
Defined Benefit Plan Disclosure [Line Items]
Total assets	$ 11	$ 19
Duke Energy Carolinas | Master Trust
Defined Benefit Plan Disclosure [Line Items]
Allocated assets (as a percent)	26.00%	26.00%
Progress Energy | Master Trust
Defined Benefit Plan Disclosure [Line Items]
Allocated assets (as a percent)	32.00%	32.00%
Duke Energy Progress | Master Trust
Defined Benefit Plan Disclosure [Line Items]
Allocated assets (as a percent)	15.00%	15.00%
Duke Energy Florida | Master Trust
Defined Benefit Plan Disclosure [Line Items]
Allocated assets (as a percent)	17.00%	17.00%
Duke Energy Ohio | Master Trust
Defined Benefit Plan Disclosure [Line Items]
Allocated assets (as a percent)	5.00%	5.00%
Duke Energy Indiana | Master Trust
Defined Benefit Plan Disclosure [Line Items]
Allocated assets (as a percent)	7.00%	7.00%
Piedmont | Master Trust
Defined Benefit Plan Disclosure [Line Items]
Allocated assets (as a percent)	4.00%	4.00%

Employee Benefit Plans (Reconci

Employee Benefit Plans (Reconciliation of Assets Measured at Fair Value on a Recurring Basis) (Details) - Level 3 - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Plan assets at prior measurement date		$ 11
Sales		(12)
Total gains and other, net		$ 1
Transfer of Level 3 assets from other classifications	$ 95
Plan assets at measurement date	$ 95

Employee Benefit Plans (Employe

Employee Benefit Plans (Employee Savings Plans) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]
Matching contribution percentage	100.00%
Eligible pay percentage	6.00%
Additional contribution percentage for employees not participating in defined pension plans	4.00%
Employer contributions	$ 229	$ 213	$ 214
Vesting period	3 years
Duke Energy Carolinas
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	$ 70	67	66
Progress Energy
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	60	57	58
Duke Energy Progress
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	39	38	38
Duke Energy Florida
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	21	19	20
Duke Energy Ohio
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	5	5	5
Duke Energy Indiana
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	12	11	11
Piedmont
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	$ 11	$ 13	$ 13
Minimum | Piedmont
Defined Benefit Plan Disclosure [Line Items]
Additional contribution percentage for employees not participating in defined pension plans	3.00%
Maximum | Piedmont
Defined Benefit Plan Disclosure [Line Items]
Additional contribution percentage for employees not participating in defined pension plans	5.00%

Income Taxes (Narrative) (Detai

Income Taxes (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Dec. 31, 2021	Sep. 30, 2020	Dec. 31, 2020	Dec. 31, 2019
Income Tax Disclosure [Line Items]
Refund of AMT credit carryforwards			$ 572	$ 573
Deferred tax liabilities			$ 117
State
Income Tax Disclosure [Line Items]
Reduction in deferred tax liability	$ 490
Reduction of deferred tax assets	$ 25
AMT credit carryforwards
Income Tax Disclosure [Line Items]
Refund of AMT credit carryforwards		$ 572
Income tax interest income		$ 19

Income Taxes (Components of Inc

Income Taxes (Components of Income Tax Expense) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Current income taxes
Federal	$ (2)	$ (281)	$ (299)
State	2	(9)	10
Foreign	2	1	2
Total current income taxes	2	(289)	(287)
Deferred income taxes
Federal	199	155	855
State	(1)	(92)	(38)
Total deferred income taxes	198	63	817
ITC amortization	(8)	(10)	(11)
Income tax expense from continuing operations	192	(236)	519
Tax expense from discontinued operations		2	(2)
Total income tax expense included in Consolidated Statements of Operations	192	(234)	517
Net operating loss carry forward	150	79	775
Duke Energy Income from Continuing Operations Before Income Taxes [Abstract]
Domestic	3,720	826	4,053
Foreign	44	13	44
Income from continuing operations before income taxes	3,764	839	4,097
Duke Energy Carolinas
Current income taxes
Federal	241	314	164
State	23	35	13
Total current income taxes	264	349	177
Deferred income taxes
Federal	(130)	(171)	175
State	(79)	(86)	(37)
Total deferred income taxes	(209)	(257)	138
ITC amortization	(4)	(4)	(4)
Income tax expense from continuing operations	51	88	311
Total income tax expense included in Consolidated Statements of Operations	51	88	311
Net operating loss carry forward	32	20	8
Duke Energy Income from Continuing Operations Before Income Taxes [Abstract]
Income from continuing operations before income taxes	1,387	1,044	1,714
Progress Energy
Current income taxes
Federal	(15)	280	(173)
State	(4)	29	(7)
Total current income taxes	(19)	309	(180)
Deferred income taxes
Federal	203	(167)	422
State	47	(24)	17
Total deferred income taxes	250	(191)	439
ITC amortization	(4)	(5)	(6)
Income tax expense from continuing operations	227	113	253
Total income tax expense included in Consolidated Statements of Operations	227	113	253
Net operating loss carry forward	95	39	243
Duke Energy Progress
Current income taxes
Federal	113	181	(36)
State	8	17	(3)
Total current income taxes	121	198	(39)
Deferred income taxes
Federal	(16)	(180)	220
State	(26)	(49)	(18)
Total deferred income taxes	(42)	(229)	202
ITC amortization	(4)	(5)	(6)
Income tax expense from continuing operations	75	(36)	157
Total income tax expense included in Consolidated Statements of Operations	75	(36)	157
Net operating loss carry forward	14	3	35
Duke Energy Income from Continuing Operations Before Income Taxes [Abstract]
Income from continuing operations before income taxes	1,066	379	962
Duke Energy Florida
Current income taxes
Federal	(75)	148	(43)
State	(17)	24	18
Total current income taxes	(92)	172	(25)
Deferred income taxes
Federal	202	1	153
State	77	25	27
Total deferred income taxes	279	26	180
Income tax expense from continuing operations	187	198	155
Total income tax expense included in Consolidated Statements of Operations	187	198	155
Net operating loss carry forward	64	30	152
Duke Energy Income from Continuing Operations Before Income Taxes [Abstract]
Income from continuing operations before income taxes	925	969	847
Duke Energy Ohio
Current income taxes
Federal	(8)	10	(41)
State	(2)	1	(1)
Total current income taxes	(10)	11	(42)
Deferred income taxes
Federal	35	30	77
State	5	2	5
Total deferred income taxes	40	32	82
Income tax expense from continuing operations	30	43	40
Total income tax expense included in Consolidated Statements of Operations	30	43	40
Net operating loss carry forward	2		25
Duke Energy Income from Continuing Operations Before Income Taxes [Abstract]
Income from continuing operations before income taxes	234	295	279
Duke Energy Indiana
Current income taxes
Federal	65	48	(23)
State	7	7	1
Total current income taxes	72	55	(22)
Deferred income taxes
Federal	19	12	128
State	16	17	28
Total deferred income taxes	35	29	156
Income tax expense from continuing operations	107	84	134
Total income tax expense included in Consolidated Statements of Operations	107	84	134
Net operating loss carry forward	8	8	60
Duke Energy Income from Continuing Operations Before Income Taxes [Abstract]
Income from continuing operations before income taxes	588	492	570
Piedmont
Current income taxes
Federal	23	(27)	(92)
State	3	(8)	(1)
Total current income taxes	26	(35)	(93)
Deferred income taxes
Federal	17	60	133
State	(13)	(7)	3
Total deferred income taxes	4	53	136
Income tax expense from continuing operations	30	18	43
Total income tax expense included in Consolidated Statements of Operations	30	18	43
Net operating loss carry forward	3	11	90
Duke Energy Income from Continuing Operations Before Income Taxes [Abstract]
Income from continuing operations before income taxes	$ 340	$ 291	$ 245

Income Taxes (Effective Tax Rat

Income Taxes (Effective Tax Rates) (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Reconciliation of Income Tax Expense at the U.S. Federal Statutory Tax Rate to the Actual Tax Expense from Continuing Operations [Abstract]
Income tax expense, computed at the statutory rate of 21%		$ 790	$ 176	$ 860
State income tax, net of federal income tax effect		1	(80)	(22)
Amortization of excess deferred income tax		(438)	(276)	(121)
AFUDC equity income		(34)	(48)	(52)
AFUDC equity depreciation		35	103	34
Noncontrolling Interests		72	62
Renewable energy PTCs		(100)	(110)	(120)
Other tax credits		(30)	(37)	(23)
Tax true up			(12)	(64)
Valuation allowance	$ (85)	(85)
Other items, net		(19)	(14)	27
Income tax expense from continuing operations		$ 192	$ (236)	$ 519
Effective tax rate		5.10%	(28.10%)	12.70%
Federal capital gain	$ 426
Duke Energy Carolinas
Reconciliation of Income Tax Expense at the U.S. Federal Statutory Tax Rate to the Actual Tax Expense from Continuing Operations [Abstract]
Income tax expense, computed at the statutory rate of 21%		$ 291	$ 219	$ 360
State income tax, net of federal income tax effect		(44)	(40)	(19)
Amortization of excess deferred income tax		(184)	(82)	(29)
AFUDC equity income		(14)	(13)	(9)
AFUDC equity depreciation		18	19	19
Other tax credits		(12)	(13)	(11)
Tax true up			(3)	(9)
Other items, net		(4)	1	9
Income tax expense from continuing operations		$ 51	$ 88	$ 311
Effective tax rate		3.70%	8.40%	18.10%
Progress Energy
Reconciliation of Income Tax Expense at the U.S. Federal Statutory Tax Rate to the Actual Tax Expense from Continuing Operations [Abstract]
Income tax expense, computed at the statutory rate of 21%		$ 384	$ 243	$ 332
State income tax, net of federal income tax effect		34	4	8
Amortization of excess deferred income tax		(174)	(118)	(64)
AFUDC equity income		(11)	(9)	(14)
AFUDC equity depreciation		10	10	10
Other tax credits		(11)	(16)	(9)
Tax true up			1	(8)
Other items, net		(5)	(2)	(2)
Income tax expense from continuing operations		$ 227	$ 113	$ 253
Effective tax rate		12.40%	9.70%	16.00%
Duke Energy Progress
Reconciliation of Income Tax Expense at the U.S. Federal Statutory Tax Rate to the Actual Tax Expense from Continuing Operations [Abstract]
Income tax expense, computed at the statutory rate of 21%		$ 224	$ 80	$ 202
State income tax, net of federal income tax effect		(14)	(25)	(17)
Amortization of excess deferred income tax		(120)	(68)	(10)
AFUDC equity income		(7)	(6)	(13)
AFUDC equity depreciation		5	5	5
Other tax credits		(8)	(14)	(7)
Tax true up			(5)	(3)
Other items, net		(5)	(3)
Income tax expense from continuing operations		$ 75	$ (36)	$ 157
Effective tax rate		7.00%	(9.50%)	16.30%
Duke Energy Florida
Reconciliation of Income Tax Expense at the U.S. Federal Statutory Tax Rate to the Actual Tax Expense from Continuing Operations [Abstract]
Income tax expense, computed at the statutory rate of 21%		$ 194	$ 204	$ 178
State income tax, net of federal income tax effect		47	39	35
Amortization of excess deferred income tax		(54)	(49)	(54)
AFUDC equity income		(3)	(3)	(1)
AFUDC equity depreciation		5	5	5
Other tax credits		(3)	(2)	(2)
Tax true up			5	(5)
Other items, net		1	(1)	(1)
Income tax expense from continuing operations		$ 187	$ 198	$ 155
Effective tax rate		20.20%	20.40%	18.30%
Duke Energy Ohio
Reconciliation of Income Tax Expense at the U.S. Federal Statutory Tax Rate to the Actual Tax Expense from Continuing Operations [Abstract]
Income tax expense, computed at the statutory rate of 21%		$ 49	$ 62	$ 59
State income tax, net of federal income tax effect		2	2	3
Amortization of excess deferred income tax		(22)	(20)	(12)
AFUDC equity income		(2)	(2)	(3)
AFUDC equity depreciation		2	1	1
Other tax credits		(1)	(1)	(1)
Tax true up				(7)
Other items, net		2	1
Income tax expense from continuing operations		$ 30	$ 43	$ 40
Effective tax rate		12.80%	14.60%	14.30%
Duke Energy Indiana
Reconciliation of Income Tax Expense at the U.S. Federal Statutory Tax Rate to the Actual Tax Expense from Continuing Operations [Abstract]
Income tax expense, computed at the statutory rate of 21%		$ 123	$ 103	$ 120
State income tax, net of federal income tax effect		18	19	22
Amortization of excess deferred income tax		(34)	(36)	(6)
AFUDC equity income		(4)	(4)	(3)
AFUDC equity depreciation		5	4	4
Other tax credits		(2)	(3)	(1)
Tax true up			(1)	(1)
Other items, net		1	2	(1)
Income tax expense from continuing operations		$ 107	$ 84	$ 134
Effective tax rate		18.20%	17.10%	23.50%
Piedmont
Reconciliation of Income Tax Expense at the U.S. Federal Statutory Tax Rate to the Actual Tax Expense from Continuing Operations [Abstract]
Income tax expense, computed at the statutory rate of 21%		$ 71	$ 61	$ 51
State income tax, net of federal income tax effect		(8)	(12)	2
Amortization of excess deferred income tax		(25)	(21)	(10)
AFUDC equity income		(4)	(10)
Other tax credits		(4)	(2)	(1)
Tax true up			1
Other items, net			1	1
Income tax expense from continuing operations		$ 30	$ 18	$ 43
Effective tax rate		8.80%	6.20%	17.60%

Income Taxes (Deferred Income T

Income Taxes (Deferred Income Taxes) (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Deferred Tax Assets, Gross [Abstract]
Deferred credits and other liabilities	$ 347	$ 286
Lease obligations	346	515
Pension, post-retirement and other employee benefits	207	236
Progress Energy merger purchase accounting adjustments	340	441
Tax credits and NOL carryforwards	3,784	3,909
Other	85	93
Valuation allowance	(518)	(586)
Total deferred income tax assets	4,591	4,894
Deferred Tax Liabilities, Gross [Abstract]
Investments and other assets	(2,428)	(2,267)
Accelerated depreciation rates	(10,391)	(10,729)
Regulatory assets and deferred debits, net	(1,151)	(1,142)
Total deferred income tax liabilities	(13,970)	(14,138)
Net deferred income tax liabilities	(9,379)	(9,244)
Components and Expiration Dates of Tax Credits and NOL Carryforwards [Abstract]
Tax credits and NOL carryforwards	3,784	3,909
Valuation allowance	518	586
General Business Credits
Deferred Tax Assets, Gross [Abstract]
Tax credits and NOL carryforwards	2,312
Components and Expiration Dates of Tax Credits and NOL Carryforwards [Abstract]
Tax credits and NOL carryforwards	2,312
NOL Carryforwards | Federal
Deferred Tax Assets, Gross [Abstract]
Tax credits and NOL carryforwards	4
Valuation allowance	(4)
Components and Expiration Dates of Tax Credits and NOL Carryforwards [Abstract]
Tax credits and NOL carryforwards	4
Valuation allowance	4
NOL Carryforwards | State
Deferred Tax Assets, Gross [Abstract]
Tax credits and NOL carryforwards	328
Valuation allowance	(112)
Components and Expiration Dates of Tax Credits and NOL Carryforwards [Abstract]
Tax credits and NOL carryforwards	328
Valuation allowance	112
NOL Carryforwards | Foreign
Deferred Tax Assets, Gross [Abstract]
Tax credits and NOL carryforwards	12
Valuation allowance	(12)
Components and Expiration Dates of Tax Credits and NOL Carryforwards [Abstract]
Tax credits and NOL carryforwards	12
Valuation allowance	12
Foreign Tax Credit
Deferred Tax Assets, Gross [Abstract]
Valuation allowance	(390)
Components and Expiration Dates of Tax Credits and NOL Carryforwards [Abstract]
Valuation allowance	390
Foreign Tax Credit | Foreign
Deferred Tax Assets, Gross [Abstract]
Tax credits and NOL carryforwards	1,128
Components and Expiration Dates of Tax Credits and NOL Carryforwards [Abstract]
Tax credits and NOL carryforwards	1,128
Duke Energy Carolinas
Deferred Tax Assets, Gross [Abstract]
Deferred credits and other liabilities	121	85
Lease obligations	91	96
Pension, post-retirement and other employee benefits	(36)	(30)
Tax credits and NOL carryforwards	349	285
Regulatory liabilities and deferred credits	11	11
Other	12	8
Total deferred income tax assets	548	455
Deferred Tax Liabilities, Gross [Abstract]
Investments and other assets	(1,205)	(1,127)
Accelerated depreciation rates	(2,977)	(3,170)
Total deferred income tax liabilities	(4,182)	(4,297)
Net deferred income tax liabilities	(3,634)	(3,842)
Components and Expiration Dates of Tax Credits and NOL Carryforwards [Abstract]
Tax credits and NOL carryforwards	349	285
Progress Energy
Deferred Tax Assets, Gross [Abstract]
Deferred credits and other liabilities	101	87
Lease obligations	197	208
Pension, post-retirement and other employee benefits	30	68
Tax credits and NOL carryforwards	497	508
Other	12	14
Total deferred income tax assets	837	885
Deferred Tax Liabilities, Gross [Abstract]
Investments and other assets	(742)	(669)
Accelerated depreciation rates	(3,891)	(3,868)
Regulatory assets and deferred debits, net	(768)	(744)
Total deferred income tax liabilities	(5,401)	(5,281)
Net deferred income tax liabilities	(4,564)	(4,396)
Components and Expiration Dates of Tax Credits and NOL Carryforwards [Abstract]
Tax credits and NOL carryforwards	497	508
Duke Energy Progress
Deferred Tax Assets, Gross [Abstract]
Deferred credits and other liabilities	60	67
Lease obligations	121	120
Pension, post-retirement and other employee benefits	17	24
Tax credits and NOL carryforwards	160	179
Other	7	9
Total deferred income tax assets	365	399
Deferred Tax Liabilities, Gross [Abstract]
Investments and other assets	(610)	(507)
Accelerated depreciation rates	(1,546)	(1,778)
Regulatory assets and deferred debits, net	(417)	(412)
Total deferred income tax liabilities	(2,573)	(2,697)
Net deferred income tax liabilities	(2,208)	(2,298)
Components and Expiration Dates of Tax Credits and NOL Carryforwards [Abstract]
Tax credits and NOL carryforwards	160	179
Duke Energy Florida
Deferred Tax Assets, Gross [Abstract]
Deferred credits and other liabilities	40	18
Lease obligations	76	87
Pension, post-retirement and other employee benefits	7	38
Tax credits and NOL carryforwards	306	282
Other	4	4
Total deferred income tax assets	433	429
Deferred Tax Liabilities, Gross [Abstract]
Investments and other assets	(135)	(164)
Accelerated depreciation rates	(2,382)	(2,124)
Regulatory assets and deferred debits, net	(350)	(332)
Total deferred income tax liabilities	(2,867)	(2,620)
Net deferred income tax liabilities	(2,434)	(2,191)
Components and Expiration Dates of Tax Credits and NOL Carryforwards [Abstract]
Tax credits and NOL carryforwards	306	282
Duke Energy Ohio
Deferred Tax Assets, Gross [Abstract]
Deferred credits and other liabilities	19	21
Lease obligations	4	5
Pension, post-retirement and other employee benefits	11	16
Tax credits and NOL carryforwards	13	16
Regulatory liabilities and deferred credits	16	18
Investments and other assets	5	7
Other	7	7
Total deferred income tax assets	75	90
Deferred Tax Liabilities, Gross [Abstract]
Accelerated depreciation rates	(1,125)	(1,071)
Total deferred income tax liabilities	(1,125)	(1,071)
Net deferred income tax liabilities	(1,050)	(981)
Components and Expiration Dates of Tax Credits and NOL Carryforwards [Abstract]
Tax credits and NOL carryforwards	13	16
Duke Energy Indiana
Deferred Tax Assets, Gross [Abstract]
Deferred credits and other liabilities	7	7
Lease obligations	16	16
Pension, post-retirement and other employee benefits	20	26
Tax credits and NOL carryforwards	195	183
Investments and other assets	6
Other	2	1
Total deferred income tax assets	246	233
Deferred Tax Liabilities, Gross [Abstract]
Investments and other assets		(14)
Accelerated depreciation rates	(1,496)	(1,433)
Regulatory assets and deferred debits, net	(53)	(14)
Total deferred income tax liabilities	(1,549)	(1,461)
Net deferred income tax liabilities	(1,303)	(1,228)
Components and Expiration Dates of Tax Credits and NOL Carryforwards [Abstract]
Tax credits and NOL carryforwards	195	183
Piedmont
Deferred Tax Assets, Gross [Abstract]
Deferred credits and other liabilities	18	38
Lease obligations	4	5
Pension, post-retirement and other employee benefits	(8)	(5)
Tax credits and NOL carryforwards	29	29
Regulatory liabilities and deferred credits	6
Other	8	8
Total deferred income tax assets	57	75
Deferred Tax Liabilities, Gross [Abstract]
Investments and other assets	(39)	(48)
Accelerated depreciation rates	(833)	(844)
Regulatory assets and deferred debits, net		(4)
Total deferred income tax liabilities	(872)	(896)
Net deferred income tax liabilities	(815)	(821)
Components and Expiration Dates of Tax Credits and NOL Carryforwards [Abstract]
Tax credits and NOL carryforwards	$ 29	$ 29

Income Taxes (Other Disclosures

Income Taxes (Other Disclosures) (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Unrecognized tax benefits – January 1		$ 125	$ 126	$ 24
Unrecognized tax benefit increases				105
Gross decreases – tax positions in prior periods		(86)	(2)	(3)
Gross increases – current period tax positions		12	4
Reduction due to lapse of statute of limitations			(3)
Total changes		(74)	(1)	102
Unrecognized tax benefits – December 31	$ 51	51	125	126
Amount that if recognized, would affect the effective tax rate or regulatory liability	47	47
Federal capital gain	426
Duke Energy Carolinas
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Unrecognized tax benefits – January 1		10	8	6
Unrecognized tax benefit increases				2
Gross increases – current period tax positions		3	2
Total changes		3	2	2
Unrecognized tax benefits – December 31	13	13	10	8
Amount that if recognized, would affect the effective tax rate or regulatory liability	13	13
Progress Energy
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Unrecognized tax benefits – January 1		10	9	9
Unrecognized tax benefit increases				1
Gross decreases – tax positions in prior periods				(1)
Gross increases – current period tax positions		5	1
Total changes		5	1
Unrecognized tax benefits – December 31	15	15	10	9
Amount that if recognized, would affect the effective tax rate or regulatory liability	14	14
Duke Energy Progress
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Unrecognized tax benefits – January 1		6	6	6
Unrecognized tax benefit increases				1
Gross decreases – tax positions in prior periods				(1)
Gross increases – current period tax positions		4
Total changes		4
Unrecognized tax benefits – December 31	10	10	6	6
Amount that if recognized, would affect the effective tax rate or regulatory liability	10	10
Duke Energy Florida
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Unrecognized tax benefits – January 1		3	3	3
Gross increases – current period tax positions		1
Total changes		1
Unrecognized tax benefits – December 31	4	4	3	3
Amount that if recognized, would affect the effective tax rate or regulatory liability	4	4
Duke Energy Ohio
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Unrecognized tax benefits – January 1		1	1	1
Unrecognized tax benefits – December 31	1	1	1	1
Amount that if recognized, would affect the effective tax rate or regulatory liability	1	1
Duke Energy Indiana
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Unrecognized tax benefits – January 1		1	1	1
Gross increases – current period tax positions		1
Total changes		1
Unrecognized tax benefits – December 31	2	2	1	1
Amount that if recognized, would affect the effective tax rate or regulatory liability	2	2
Piedmont
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Unrecognized tax benefits – January 1		1	4	4
Gross increases – current period tax positions		3
Reduction due to lapse of statute of limitations			(3)
Total changes		3	(3)
Unrecognized tax benefits – December 31	4	4	$ 1	$ 4
Amount that if recognized, would affect the effective tax rate or regulatory liability	$ 4	$ 4

Other Income and Expenses, Ne_2

Other Income and Expenses, Net (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Component Of Other Income Expense Nonoperating [Line Items]
Interest income	$ 16	$ 32	$ 31
AFUDC equity	171	154	139
Post in-service equity returns	39	27	29
Nonoperating income, other	417	240	231
Other income and expense, net	643	453	430
Duke Energy Carolinas
Component Of Other Income Expense Nonoperating [Line Items]
Interest income	4	4	1
AFUDC equity	65	62	42
Post in-service equity returns	21	17	20
Nonoperating income, other	180	94	88
Other income and expense, net	270	177	151
Progress Energy
Component Of Other Income Expense Nonoperating [Line Items]
Interest income	8	8	11
AFUDC equity	51	42	66
Post in-service equity returns	16	8	7
Nonoperating income, other	140	71	57
Other income and expense, net	215	129	141
Duke Energy Progress
Component Of Other Income Expense Nonoperating [Line Items]
Interest income	6	2
AFUDC equity	34	29	60
Post in-service equity returns	16	8	7
Nonoperating income, other	87	36	33
Other income and expense, net	143	75	100
Duke Energy Florida
Component Of Other Income Expense Nonoperating [Line Items]
Interest income	2	6	11
AFUDC equity	16	12	6
Nonoperating income, other	53	35	31
Other income and expense, net	71	53	48
Duke Energy Ohio
Component Of Other Income Expense Nonoperating [Line Items]
Interest income	4	4	10
AFUDC equity	7	7	13
Post in-service equity returns	1	1	1
Nonoperating income, other	6	4
Other income and expense, net	18	16	24
Duke Energy Indiana
Component Of Other Income Expense Nonoperating [Line Items]
Interest income	6	6	10
AFUDC equity	27	23	18
Post in-service equity returns	1	1
Nonoperating income, other	8	7	13
Other income and expense, net	42	37	41
Piedmont
Component Of Other Income Expense Nonoperating [Line Items]
Interest income	19	17	1
AFUDC equity	20	19
Nonoperating income, other	16	15	19
Other income and expense, net	$ 55	$ 51	$ 20