Duke Energy Carolinas 10-Q 5 Nov 20 2020 Q3 Quarterly report Financial data

Cover Page

Cover Page - shares	9 Months Ended
	Sep. 30, 2020	Oct. 31, 2020
Document Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2020
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	550 South Tryon 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 Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		735,958,560
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q3
Current Fiscal Year End Date	--12-31
Amendment Flag	false
Entity Central Index Key	0001326160
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 Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Current Fiscal Year End Date	--12-31
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 Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Current Fiscal Year End Date	--12-31
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 Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Current Fiscal Year End Date	--12-31
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 Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	false
Entity Shell Company	false
Current Fiscal Year End Date	--12-31
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 Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	false
Entity Shell Company	false
Current Fiscal Year End Date	--12-31
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 Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	false
Entity Shell Company	false
Current Fiscal Year End Date	--12-31
Entity Central Index Key	0000081020
Piedmont Natural Gas
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 Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	false
Entity Shell Company	false
Current Fiscal Year End Date	--12-31
Entity Central Index Key	0000078460
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 5.125% Coupon Due January 2073 [Member]
Document Information [Line Items]
Title of 12(b) Security	5.125% Junior Subordinated Debentures
Trading Symbol	DUKH
Security Exchange Name	NYSE
Junior Subordinated Debentures 5.625% Coupon Due September 2078 [Member]
Document Information [Line Items]
Title of 12(b) Security	5.625% Junior Subordinated Debentures
Trading Symbol	DUKB
Security Exchange Name	NYSE
Depositary Share [Member]
Document Information [Line Items]
Title of 12(b) Security	Depositary Shares
Trading Symbol	DUK PR A
Security Exchange Name	NYSE

Condensed Consolidated Statemen

Condensed Consolidated Statements of Operations and Comprehensive Income - USD ($) shares in Millions, $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Operating Revenues
Regulated electric		$ 6,315	$ 6,515	$ 16,402	$ 17,223
Regulated natural gas		214	223	1,115	1,231
Nonregulated electric and other		192	202	574	522
Total operating revenues		6,721	6,940	18,091	18,976
Operating Expenses
Operation, maintenance and other		1,450	1,484	4,142	4,337
Depreciation and amortization		1,217	1,186	3,497	3,364
Property and other taxes		324	335	1,003	1,012
Impairment charges		28	(20)	36	(16)
Total operating expenses		4,909	5,011	13,622	14,376
Gains on Sales of Other Assets and Other, net		2		10
Operating Income		1,814	1,929	4,479	4,600
Other Income and Expenses
Equity in (losses) earnings of unconsolidated affiliates		(80)	50	(2,004)	137
Other income and expenses, net		127	104	310	308
Total other income and expenses		47	154	(1,694)	445
Interest Expense		522	572	1,627	1,657
Income Before Income Taxes		1,339	1,511	1,158	3,388
Income Tax Expense (Benefit)		105	188	(74)	424
Net Income		1,234	1,323	1,232	2,964
Less: Net Income Attributable to Noncontrolling Interests		(70)	(19)	(208)	(110)
Net income (attributable to parent)		1,304	1,342	1,440	3,074
Less: Preferred Dividends		39	15	93	27
Net Income Available to Duke Energy Corporation Common Stockholders		1,265	1,327	1,347	3,047
Other Comprehensive Income (Loss), net of tax
Pension and OPEB adjustments	[1]	1	(2)	1	1
Net unrealized (losses) gains on cash flow hedges	[1]	(83)	(16)	(159)	(62)
Unrealized gains on available-for-sale securities	[1]	(2)	2	5	10
Other Comprehensive Loss, net of tax	[1]	(80)	(15)	(145)	(47)
Comprehensive Income		1,154	1,308	1,087	2,917
Less: Comprehensive Income Attributable to Noncontrolling Interests		(70)	(19)	(220)	(110)
Comprehensive Income Attributable to Duke Energy		$ 1,224	$ 1,327	$ 1,307	$ 3,027
Net income attributable to Duke Energy Corporation common stockholders
Basic and Diluted (in usd per share)		$ 1.74	$ 1.82	$ 1.85	$ 4.18
Weighted Average Shares Outstanding
Basic and Diluted (in shares)		735	729	735	728
Duke Energy Carolinas
Operating Revenues
Total operating revenues		$ 2,058	$ 2,162	$ 5,416	$ 5,619
Operating Expenses
Fuel used in electric generation and purchased power/Cost of natural gas		497	504	1,326	1,371
Operation, maintenance and other		402	443	1,218	1,324
Depreciation and amortization		372	350	1,090	1,013
Property and other taxes		57	66	213	221
Impairment charges		20	6	22	11
Total operating expenses		1,348	1,369	3,869	3,940
Gains on Sales of Other Assets and Other, net		1		1
Operating Income		711	793	1,548	1,679
Other Income and Expenses
Total other income and expenses		42	34	128	106
Interest Expense		122	119	370	346
Income Before Income Taxes		631	708	1,306	1,439
Income Tax Expense (Benefit)		76	118	178	255
Net income (attributable to parent)		555	590	1,128	1,184
Other Comprehensive Income (Loss), net of tax
Comprehensive Income Attributable to Duke Energy		555	590	1,128	1,184
Progress Energy
Operating Revenues
Total operating revenues		3,197	3,242	8,117	8,558
Operating Expenses
Fuel used in electric generation and purchased power/Cost of natural gas		1,088	1,187	2,628	3,100
Operation, maintenance and other		646	640	1,789	1,813
Depreciation and amortization		472	496	1,356	1,377
Property and other taxes		147	159	419	439
Impairment charges		1	(25)	1	(25)
Total operating expenses		2,354	2,457	6,193	6,704
Gains on Sales of Other Assets and Other, net		3	1	9
Operating Income		846	786	1,933	1,854
Other Income and Expenses
Total other income and expenses		24	41	89	106
Interest Expense		194	212	599	650
Income Before Income Taxes		676	615	1,423	1,310
Income Tax Expense (Benefit)		70	94	190	212
Net Income		606	521	1,233	1,098
Less: Net Income Attributable to Noncontrolling Interests		1	0	1	0
Net income (attributable to parent)		605	521	1,232	1,098
Other Comprehensive Income (Loss), net of tax
Pension and OPEB adjustments				1	2
Net unrealized (losses) gains on cash flow hedges		1	1	3	4
Unrealized gains on available-for-sale securities		1	1	1	2
Other Comprehensive Loss, net of tax		2	2	5	8
Comprehensive Income		608	523	1,238	1,106
Less: Comprehensive Income Attributable to Noncontrolling Interests		1		1	0
Comprehensive Income Attributable to Duke Energy		607	523	1,237	1,106
Duke Energy Progress
Operating Revenues
Total operating revenues		1,626	1,688	4,207	4,559
Operating Expenses
Fuel used in electric generation and purchased power/Cost of natural gas		537	577	1,337	1,571
Operation, maintenance and other		348	378	970	1,070
Depreciation and amortization		289	314	833	855
Property and other taxes		38	46	129	131
Impairment charges		5		5
Total operating expenses		1,217	1,315	3,274	3,627
Gains on Sales of Other Assets and Other, net		3		8
Operating Income		412	373	941	932
Other Income and Expenses
Total other income and expenses		11	27	52	75
Interest Expense		66	74	203	232
Income Before Income Taxes		357	326	790	775
Income Tax Expense (Benefit)		11	48	79	125
Net income (attributable to parent)		346	278	711	650
Other Comprehensive Income (Loss), net of tax
Comprehensive Income Attributable to Duke Energy		346	278	711	650
Duke Energy Florida
Operating Revenues
Total operating revenues		1,567	1,548	3,897	3,987
Operating Expenses
Fuel used in electric generation and purchased power/Cost of natural gas		551	610	1,291	1,529
Operation, maintenance and other		292	256	806	730
Depreciation and amortization		183	182	523	522
Property and other taxes		110	113	290	309
Impairment charges		(4)	(25)	(4)	(25)
Total operating expenses		1,132	1,136	2,906	3,065
Gains on Sales of Other Assets and Other, net			1
Operating Income		435	413	991	922
Other Income and Expenses
Total other income and expenses		11	14	36	39
Interest Expense		81	81	245	246
Income Before Income Taxes		365	346	782	715
Income Tax Expense (Benefit)		78	57	159	129
Net income (attributable to parent)		287	289	623	586
Other Comprehensive Income (Loss), net of tax
Unrealized gains on available-for-sale securities		1	1	1	2
Other Comprehensive Loss, net of tax		1	1	1	2
Comprehensive Income Attributable to Duke Energy		288	290	624	588
Duke Energy Ohio
Operating Revenues
Regulated electric		394	408	1,070	1,099
Regulated natural gas		79	81	324	354
Total operating revenues		473	489	1,394	1,453
Operating Expenses
Operation, maintenance and other		115	123	333	378
Depreciation and amortization		72	69	208	199
Property and other taxes		83	71	244	229
Total operating expenses		367	381	1,089	1,167
Operating Income		106	108	305	286
Other Income and Expenses
Total other income and expenses		4	4	11	19
Interest Expense		26	27	75	81
Income Before Income Taxes		84	85	241	224
Income Tax Expense (Benefit)		14	11	40	34
Net income (attributable to parent)		70	74	201	190
Other Comprehensive Income (Loss), net of tax
Comprehensive Income Attributable to Duke Energy		70	74	201	190
Duke Energy Indiana
Operating Revenues
Total operating revenues		761	807	2,070	2,289
Operating Expenses
Fuel used in electric generation and purchased power/Cost of natural gas		222	234	577	720
Operation, maintenance and other		207	192	564	569
Depreciation and amortization		149	130	415	393
Property and other taxes		15	16	57	55
Total operating expenses		593	572	1,613	1,737
Operating Income		168	235	457	552
Other Income and Expenses
Total other income and expenses		9	8	28	35
Interest Expense		29	40	114	111
Income Before Income Taxes		148	203	371	476
Income Tax Expense (Benefit)		29	47	72	113
Net income (attributable to parent)		119	156	299	363
Other Comprehensive Income (Loss), net of tax
Comprehensive Income Attributable to Duke Energy		119	156	299	363
Piedmont Natural Gas
Operating Revenues
Total operating revenues		162	168	871	956
Operating Expenses
Fuel used in electric generation and purchased power/Cost of natural gas		39	46	254	384
Operation, maintenance and other		75	78	234	241
Depreciation and amortization		45	43	133	127
Property and other taxes		13	14	37	39
Impairment charges		7		7
Total operating expenses		179	181	665	791
Operating Income		(17)	(13)	206	165
Other Income and Expenses
Equity in (losses) earnings of unconsolidated affiliates				7	6
Total other income and expenses		16	7	44	19
Interest Expense		29	22	89	65
Income Before Income Taxes		(30)	(28)	161	119
Income Tax Expense (Benefit)		(5)	(10)	6	22
Net income (attributable to parent)		(25)	(18)	155	97
Other Comprehensive Income (Loss), net of tax
Comprehensive Income Attributable to Duke Energy		(25)	(18)	155	97
Fuel used in electric generation and purchased power
Operating Expenses
Fuel used in electric generation and purchased power/Cost of natural gas		1,849	1,978	4,645	5,228
Fuel used in electric generation and purchased power | Duke Energy Ohio
Operating Expenses
Fuel used in electric generation and purchased power/Cost of natural gas		94	114	258	293
Cost of natural gas
Operating Expenses
Fuel used in electric generation and purchased power/Cost of natural gas		41	48	299	451
Cost of natural gas | Duke Energy Ohio
Operating Expenses
Fuel used in electric generation and purchased power/Cost of natural gas		$ 3	$ 4	$ 46	$ 68
[1]	Net of income tax impacts of approximately $24 million for the three months ended September 30, 2020 , and $43 million and $14 million for the nine months ended September 30, 2020 , and 2019 , respectively. All other periods presented include immaterial income tax impacts.

Condensed Consolidated Statem_2

Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest [Abstract]
Net income		$ 1,234	$ 1,323	$ 1,232	$ 2,964
Other Comprehensive Loss, net of tax
Pension and OPEB adjustments	[1]	1	(2)	1	1
Net unrealized losses on cash flow hedges	[1]	(83)	(16)	(159)	(62)
Reclassification into earnings from cash flow hedges	[1]	4	1	8	4
Unrealized (losses) gains on available-for-sale securities	[1]	(2)	2	5	10
Other Comprehensive Loss, net of tax	[1]	(80)	(15)	(145)	(47)
Comprehensive Income		1,154	1,308	1,087	2,917
Add: Comprehensive Loss Attributable to Noncontrolling Interests		70	19	220	110
Comprehensive Income Attributable to Duke Energy		1,224	1,327	1,307	3,027
Less: Preferred Dividends		39	15	93	27
Comprehensive Income Available to Duke Energy Corporation Common Stockholders		$ 1,185	$ 1,312	$ 1,214	$ 3,000
[1]	Net of income tax impacts of approximately $24 million for the three months ended September 30, 2020 , and $43 million and $14 million for the nine months ended September 30, 2020 , and 2019 , respectively. All other periods presented include immaterial income tax impacts.

Condensed Consolidated Statem_3

Condensed Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2020	Sep. 30, 2019
Statement of Comprehensive Income [Abstract]
Other comprehensive income (loss), tax	$ 24	$ 43	$ 14

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Current Assets
Cash and cash equivalents	$ 308	$ 311
Receivables (net of allowance for doubtful accounts)	719	1,066
Receivables of VIEs (net of allowance for doubtful accounts)	2,320	1,994
Inventory	3,190	3,232
Regulatory assets (includes amounts related to VIEs)	1,637	1,796
Other (includes amounts related to VIEs)	505	764
Total current assets	8,679	9,163
Property, Plant and Equipment
Cost	153,916	147,654
Accumulated depreciation and amortization	(48,185)	(45,773)
Generation facilities to be retired, net	29	246
Net property, plant and equipment	105,760	102,127
Other Noncurrent Assets
Goodwill	19,303	19,303
Regulatory assets (includes amounts related to VIEs)	13,264	13,222
Nuclear decommissioning trust funds	8,363	8,140
Operating lease right-of-use assets, net	1,577	1,658
Investments in equity method unconsolidated affiliates	924	1,936
Other (includes amounts related to VIEs)	3,539	3,289
Total other noncurrent assets	46,970	47,548
Total Assets	161,409	158,838
Current Liabilities
Accounts payable	2,486	3,487
Notes payable and commercial paper	3,425	3,135
Taxes accrued	768	392
Interest accrued	556	565
Current maturities of long-term debt (includes amounts related to VIEs)	4,669	3,141
Asset retirement obligations	742	881
Regulatory liabilities	1,218	784
Other	2,829	2,367
Total current liabilities	16,693	14,752
Long-Term Debt (includes amounts related to VIEs)	56,049	54,985
Other Noncurrent Liabilities
Deferred income taxes	9,170	8,878
Asset retirement obligations	12,912	12,437
Regulatory liabilities	14,546	15,264
Operating lease liabilities	1,379	1,432
Accrued pension and other post-retirement benefit costs	903	934
Investment tax credits	689	624
Other (includes amounts related to VIEs)	1,773	1,581
Total other noncurrent liabilities	41,372	41,150
Commitments and Contingencies
Equity
Common stock	1	1
Additional paid-in capital	41,046	40,881
Retained earnings	3,260	4,108
Accumulated other comprehensive loss	(263)	(130)
Total Duke Energy Corporation stockholders' equity	46,006	46,822
Noncontrolling interests	1,289	1,129
Total equity	47,295	47,951
Total Liabilities and Equity	161,409	158,838
Duke Energy Carolinas
Current Assets
Cash and cash equivalents	23	18
Receivables (net of allowance for doubtful accounts)	177	324
Receivables of VIEs (net of allowance for doubtful accounts)	770	642
Receivables from affiliated companies	64	114
Notes receivable from affiliated companies	65
Inventory	992	996
Regulatory assets (includes amounts related to VIEs)	495	550
Other (includes amounts related to VIEs)	44	21
Total current assets	2,630	2,665
Property, Plant and Equipment
Cost	50,622	48,922
Accumulated depreciation and amortization	(17,406)	(16,525)
Net property, plant and equipment	33,216	32,397
Other Noncurrent Assets
Regulatory assets (includes amounts related to VIEs)	3,400	3,360
Nuclear decommissioning trust funds	4,506	4,359
Operating lease right-of-use assets, net	117	123
Other (includes amounts related to VIEs)	1,179	1,149
Total other noncurrent assets	9,202	8,991
Total Assets	45,048	44,053
Current Liabilities
Accounts payable	583	954
Accounts payable to affiliated companies	155	210
Notes payable to affiliated companies		29
Taxes accrued	398	46
Interest accrued	130	115
Current maturities of long-term debt (includes amounts related to VIEs)	751	458
Asset retirement obligations	267	206
Regulatory liabilities	430	255
Other	487	611
Total current liabilities	3,201	2,884
Long-Term Debt (includes amounts related to VIEs)	11,497	11,142
Long-Term Debt Payable to Affiliated Companies	300	300
Other Noncurrent Liabilities
Deferred income taxes	3,915	3,921
Asset retirement obligations	5,507	5,528
Regulatory liabilities	6,243	6,423
Operating lease liabilities	102	102
Accrued pension and other post-retirement benefit costs	76	84
Investment tax credits	237	231
Other (includes amounts related to VIEs)	644	627
Total other noncurrent liabilities	16,724	16,916
Commitments and Contingencies
Equity
Member's equity	13,333	12,818
Accumulated other comprehensive loss	(7)	(7)
Total member's equity	13,326	12,811
Total Liabilities and Equity	45,048	44,053
Progress Energy
Current Assets
Cash and cash equivalents	70	48
Receivables (net of allowance for doubtful accounts)	196	220
Receivables of VIEs (net of allowance for doubtful accounts)	1,071	830
Receivables from affiliated companies	44	76
Notes receivable from affiliated companies		164
Inventory	1,378	1,423
Regulatory assets (includes amounts related to VIEs)	775	946
Other (includes amounts related to VIEs)	81	210
Total current assets	3,615	3,917
Property, Plant and Equipment
Cost	57,152	55,070
Accumulated depreciation and amortization	(18,008)	(17,159)
Generation facilities to be retired, net	29	246
Net property, plant and equipment	39,173	38,157
Other Noncurrent Assets
Goodwill	3,655	3,655
Regulatory assets (includes amounts related to VIEs)	6,270	6,346
Nuclear decommissioning trust funds	3,857	3,782
Operating lease right-of-use assets, net	710	788
Other (includes amounts related to VIEs)	1,212	1,049
Total other noncurrent assets	15,704	15,620
Total Assets	58,492	57,694
Current Liabilities
Accounts payable	795	1,104
Accounts payable to affiliated companies	208	310
Notes payable to affiliated companies	2,159	1,821
Taxes accrued	310	46
Interest accrued	199	228
Current maturities of long-term debt (includes amounts related to VIEs)	1,726	1,577
Asset retirement obligations	297	485
Regulatory liabilities	545	330
Other	756	902
Total current liabilities	6,995	6,803
Long-Term Debt (includes amounts related to VIEs)	17,989	17,907
Long-Term Debt Payable to Affiliated Companies	150	150
Other Noncurrent Liabilities
Deferred income taxes	4,508	4,462
Asset retirement obligations	6,058	5,986
Regulatory liabilities	4,809	5,225
Operating lease liabilities	637	697
Accrued pension and other post-retirement benefit costs	474	488
Other (includes amounts related to VIEs)	443	383
Total other noncurrent liabilities	16,929	17,241
Commitments and Contingencies
Equity
Additional paid-in capital	9,143	9,143
Retained earnings	7,296	6,465
Accumulated other comprehensive loss	(13)	(18)
Total Duke Energy Corporation stockholders' equity	16,426	15,590
Noncontrolling interests	3	3
Total equity	16,429	15,593
Total Liabilities and Equity	58,492	57,694
Duke Energy Progress
Current Assets
Cash and cash equivalents	43	22
Receivables (net of allowance for doubtful accounts)	103	123
Receivables of VIEs (net of allowance for doubtful accounts)	559	489
Receivables from affiliated companies	45	52
Inventory	910	934
Regulatory assets (includes amounts related to VIEs)	472	526
Other (includes amounts related to VIEs)	54	60
Total current assets	2,186	2,206
Property, Plant and Equipment
Cost	35,479	34,603
Accumulated depreciation and amortization	(12,548)	(11,915)
Generation facilities to be retired, net	29	246
Net property, plant and equipment	22,960	22,934
Other Noncurrent Assets
Regulatory assets (includes amounts related to VIEs)	4,449	4,152
Nuclear decommissioning trust funds	3,189	3,047
Operating lease right-of-use assets, net	357	387
Other (includes amounts related to VIEs)	720	651
Total other noncurrent assets	8,715	8,237
Total Assets	33,861	33,377
Current Liabilities
Accounts payable	372	629
Accounts payable to affiliated companies	144	203
Notes payable to affiliated companies	167	66
Taxes accrued	207	17
Interest accrued	80	110
Current maturities of long-term debt (includes amounts related to VIEs)	603	1,006
Asset retirement obligations	297	485
Regulatory liabilities	436	236
Other	389	478
Total current liabilities	2,695	3,230
Long-Term Debt (includes amounts related to VIEs)	8,605	7,902
Long-Term Debt Payable to Affiliated Companies	150	150
Other Noncurrent Liabilities
Deferred income taxes	2,426	2,388
Asset retirement obligations	5,503	5,408
Regulatory liabilities	4,140	4,232
Operating lease liabilities	329	354
Accrued pension and other post-retirement benefit costs	236	238
Investment tax credits	133	137
Other (includes amounts related to VIEs)	88	92
Total other noncurrent liabilities	12,855	12,849
Commitments and Contingencies
Equity
Total member's equity	9,556	9,246
Total Liabilities and Equity	33,861	33,377
Duke Energy Florida
Current Assets
Cash and cash equivalents	19	17
Receivables (net of allowance for doubtful accounts)	91	96
Receivables of VIEs (net of allowance for doubtful accounts)	512	341
Receivables from affiliated companies	3
Notes receivable from affiliated companies		173
Inventory	468	489
Regulatory assets (includes amounts related to VIEs)	303	419
Other (includes amounts related to VIEs)	25	58
Total current assets	1,421	1,593
Property, Plant and Equipment
Cost	21,662	20,457
Accumulated depreciation and amortization	(5,452)	(5,236)
Net property, plant and equipment	16,210	15,221
Other Noncurrent Assets
Regulatory assets (includes amounts related to VIEs)	1,821	2,194
Nuclear decommissioning trust funds	668	734
Operating lease right-of-use assets, net	354	401
Other (includes amounts related to VIEs)	341	311
Total other noncurrent assets	3,184	3,640
Total Assets	20,815	20,454
Current Liabilities
Accounts payable	424	474
Accounts payable to affiliated companies	77	131
Notes payable to affiliated companies	66
Taxes accrued	260	43
Interest accrued	73	75
Current maturities of long-term debt (includes amounts related to VIEs)	623	571
Regulatory liabilities	109	94
Other	359	415
Total current liabilities	1,991	1,803
Long-Term Debt (includes amounts related to VIEs)	7,294	7,416
Other Noncurrent Liabilities
Deferred income taxes	2,175	2,179
Asset retirement obligations	555	578
Regulatory liabilities	669	993
Operating lease liabilities	308	343
Accrued pension and other post-retirement benefit costs	207	218
Other (includes amounts related to VIEs)	205	136
Total other noncurrent liabilities	4,119	4,447
Commitments and Contingencies
Equity
Member's equity	7,411	6,789
Accumulated other comprehensive loss		(1)
Total member's equity	7,411	6,788
Total Liabilities and Equity	20,815	20,454
Duke Energy Ohio
Current Assets
Cash and cash equivalents	10	17
Receivables (net of allowance for doubtful accounts)	90	84
Receivables from affiliated companies	57	92
Inventory	130	135
Regulatory assets (includes amounts related to VIEs)	35	49
Other (includes amounts related to VIEs)	13	21
Total current assets	335	398
Property, Plant and Equipment
Cost	10,804	10,241
Accumulated depreciation and amortization	(2,989)	(2,843)
Net property, plant and equipment	7,815	7,398
Other Noncurrent Assets
Goodwill	920	920
Regulatory assets (includes amounts related to VIEs)	597	549
Operating lease right-of-use assets, net	20	21
Other (includes amounts related to VIEs)	62	52
Total other noncurrent assets	1,599	1,542
Total Assets	9,749	9,338
Current Liabilities
Accounts payable	240	288
Accounts payable to affiliated companies	54	68
Notes payable to affiliated companies	85	312
Taxes accrued	193	219
Interest accrued	32	30
Asset retirement obligations	7	1
Regulatory liabilities	66	64
Other	73	75
Total current liabilities	750	1,057
Long-Term Debt (includes amounts related to VIEs)	3,064	2,594
Long-Term Debt Payable to Affiliated Companies	25	25
Other Noncurrent Liabilities
Deferred income taxes	965	922
Asset retirement obligations	84	79
Regulatory liabilities	753	763
Operating lease liabilities	20	21
Accrued pension and other post-retirement benefit costs	104	100
Other (includes amounts related to VIEs)	100	94
Total other noncurrent liabilities	2,026	1,979
Commitments and Contingencies
Equity
Common stock	762	762
Additional paid-in capital	2,776	2,776
Retained earnings	346	145
Total Duke Energy Corporation stockholders' equity	3,884	3,683
Total Liabilities and Equity	9,749	9,338
Duke Energy Indiana
Current Assets
Cash and cash equivalents	15	25
Receivables (net of allowance for doubtful accounts)	48	60
Receivables from affiliated companies	84	79
Inventory	507	517
Regulatory assets (includes amounts related to VIEs)	119	90
Other (includes amounts related to VIEs)	30	60
Total current assets	803	831
Property, Plant and Equipment
Cost	17,223	16,305
Accumulated depreciation and amortization	(5,579)	(5,233)
Net property, plant and equipment	11,644	11,072
Other Noncurrent Assets
Regulatory assets (includes amounts related to VIEs)	1,184	1,082
Operating lease right-of-use assets, net	55	57
Other (includes amounts related to VIEs)	228	234
Total other noncurrent assets	1,467	1,373
Total Assets	13,914	13,276
Current Liabilities
Accounts payable	172	201
Accounts payable to affiliated companies	65	87
Notes payable to affiliated companies	83	30
Taxes accrued	110	49
Interest accrued	63	58
Current maturities of long-term debt (includes amounts related to VIEs)	13	503
Asset retirement obligations	170	189
Regulatory liabilities	76	55
Other	98	112
Total current liabilities	850	1,284
Long-Term Debt (includes amounts related to VIEs)	3,941	3,404
Long-Term Debt Payable to Affiliated Companies	150	150
Other Noncurrent Liabilities
Deferred income taxes	1,179	1,150
Asset retirement obligations	1,044	643
Regulatory liabilities	1,648	1,685
Operating lease liabilities	53	55
Accrued pension and other post-retirement benefit costs	151	148
Investment tax credits	168	164
Other (includes amounts related to VIEs)	56	18
Total other noncurrent liabilities	4,299	3,863
Commitments and Contingencies
Equity
Total member's equity	4,674	4,575
Total Liabilities and Equity	13,914	13,276
Piedmont Natural Gas
Current Assets
Receivables (net of allowance for doubtful accounts)	93	241
Receivables from affiliated companies	11	10
Inventory	47	72
Regulatory assets (includes amounts related to VIEs)	119	73
Other (includes amounts related to VIEs)	51	28
Total current assets	321	424
Property, Plant and Equipment
Cost	8,882	8,446
Accumulated depreciation and amortization	(1,713)	(1,681)
Net property, plant and equipment	7,169	6,765
Other Noncurrent Assets
Goodwill	49	49
Regulatory assets (includes amounts related to VIEs)	287	290
Operating lease right-of-use assets, net	21	24
Investments in equity method unconsolidated affiliates	86	83
Other (includes amounts related to VIEs)	279	121
Total other noncurrent assets	722	567
Total Assets	8,212	7,756
Current Liabilities
Accounts payable	177	215
Accounts payable to affiliated companies	63	3
Notes payable to affiliated companies	327	476
Taxes accrued	36	24
Interest accrued	37	33
Current maturities of long-term debt (includes amounts related to VIEs)	160
Regulatory liabilities	101	81
Other	59	67
Total current liabilities	960	899
Long-Term Debt (includes amounts related to VIEs)	2,620	2,384
Other Noncurrent Liabilities
Deferred income taxes	775	708
Asset retirement obligations	17	17
Regulatory liabilities	1,070	1,131
Operating lease liabilities	20	23
Accrued pension and other post-retirement benefit costs	7	3
Other (includes amounts related to VIEs)	146	148
Total other noncurrent liabilities	2,035	2,030
Commitments and Contingencies
Equity
Common stock	1,310	1,310
Retained earnings	1,287	1,133
Total Duke Energy Corporation stockholders' equity	2,597	2,443
Total Liabilities and Equity	8,212	7,756
Preferred stock, Series A
Equity
Preferred stock	973	973
Preferred stock, Series B
Equity
Preferred stock	$ 989	$ 989

Condensed Consolidated Balanc_2

Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Allowance for doubtful accounts - receivables	$ 27	$ 22
Regulatory Assets: Current	1,637	1,796
Current Assets: Other	505	764
Other Noncurrent Assets: Regulatory assets	13,264	13,222
Other, noncurrent assets	3,539	3,289
Current maturities of long-term debt	4,669	3,141
Long-Term Debt	$ 56,049	$ 54,985
Common stock, par value (in usd per share)	$ 0.001	$ 0.001
Common stock, shares authorized	2,000,000,000	2,000,000,000
Common stock, shares outstanding	736,000,000	733,000,000
Other, noncurrent liabilities	$ 1,773	$ 1,581
Variable Interest Entity [Member]
Allowance for doubtful accounts - receivables of VIEs	106	54
Regulatory Assets: Current	53	52
Current Assets: Other	335	242
Other Noncurrent Assets: Regulatory assets	951	989
Other, noncurrent assets	90	110
Current maturities of long-term debt	466	216
Long-Term Debt	3,628	3,997
Other, noncurrent liabilities	342	228
Duke Energy Carolinas
Allowance for doubtful accounts - receivables	1	3
Regulatory Assets: Current	495	550
Current Assets: Other	44	21
Other Noncurrent Assets: Regulatory assets	3,400	3,360
Other, noncurrent assets	1,179	1,149
Current maturities of long-term debt	751	458
Long-Term Debt	11,497	11,142
Other, noncurrent liabilities	644	627
Duke Energy Carolinas | Variable Interest Entity [Member]
Allowance for doubtful accounts - receivables of VIEs	21	7
Progress Energy
Allowance for doubtful accounts - receivables	9	7
Regulatory Assets: Current	775	946
Current Assets: Other	81	210
Other Noncurrent Assets: Regulatory assets	6,270	6,346
Other, noncurrent assets	1,212	1,049
Current maturities of long-term debt	1,726	1,577
Long-Term Debt	$ 17,989	$ 17,907
Common stock, par value (in usd per share)	$ 0.01	$ 0.01
Common stock, shares authorized	100	100
Common stock, shares outstanding	100	100
Other, noncurrent liabilities	$ 443	$ 383
Progress Energy | Variable Interest Entity [Member]
Allowance for doubtful accounts - receivables of VIEs	28	9
Regulatory Assets: Current	53	52
Current Assets: Other	16	39
Other Noncurrent Assets: Regulatory assets	951	989
Current maturities of long-term debt	305	54
Long-Term Debt	1,351	1,632
Duke Energy Progress
Allowance for doubtful accounts - receivables	4	3
Regulatory Assets: Current	472	526
Current Assets: Other	54	60
Other Noncurrent Assets: Regulatory assets	4,449	4,152
Other, noncurrent assets	720	651
Current maturities of long-term debt	603	1,006
Long-Term Debt	8,605	7,902
Other, noncurrent liabilities	88	92
Duke Energy Progress | Variable Interest Entity [Member]
Allowance for doubtful accounts - receivables of VIEs	17	5
Duke Energy Florida
Allowance for doubtful accounts - receivables	5	3
Regulatory Assets: Current	303	419
Current Assets: Other	25	58
Other Noncurrent Assets: Regulatory assets	1,821	2,194
Other, noncurrent assets	341	311
Current maturities of long-term debt	623	571
Long-Term Debt	7,294	7,416
Other, noncurrent liabilities	205	136
Duke Energy Florida | Variable Interest Entity [Member]
Allowance for doubtful accounts - receivables of VIEs	11	4
Regulatory Assets: Current	53	52
Current Assets: Other	16	39
Other Noncurrent Assets: Regulatory assets	951	989
Current maturities of long-term debt	305	54
Long-Term Debt	1,001	1,307
Duke Energy Ohio
Allowance for doubtful accounts - receivables	5	4
Regulatory Assets: Current	35	49
Current Assets: Other	13	21
Other Noncurrent Assets: Regulatory assets	597	549
Other, noncurrent assets	62	52
Long-Term Debt	$ 3,064	$ 2,594
Common stock, par value (in usd per share)	$ 8.50	$ 8.50
Common stock, shares authorized	120,000,000	120,000,000
Common stock, shares outstanding	90,000,000	90,000,000
Other, noncurrent liabilities	$ 100	$ 94
Duke Energy Indiana
Allowance for doubtful accounts - receivables	3	3
Regulatory Assets: Current	119	90
Current Assets: Other	30	60
Other Noncurrent Assets: Regulatory assets	1,184	1,082
Other, noncurrent assets	228	234
Current maturities of long-term debt	13	503
Long-Term Debt	3,941	3,404
Other, noncurrent liabilities	56	18
Piedmont Natural Gas
Allowance for doubtful accounts - receivables	9	6
Regulatory Assets: Current	119	73
Current Assets: Other	51	28
Other Noncurrent Assets: Regulatory assets	287	290
Other, noncurrent assets	279	121
Current maturities of long-term debt	160
Long-Term Debt	$ 2,620	$ 2,384
Common stock, shares authorized	100	100
Common stock, shares outstanding	100	100
Other, noncurrent liabilities	$ 146	$ 148
Preferred stock, Series A
Preferred stock, par value (in usd per share)	$ 0.001	$ 0.001
Preferred stock, depositary shares authorized	40,000,000	40,000,000
Preferred stock, depositary shares outstanding	40,000,000	40,000,000
Preferred stock, Series B
Preferred stock, par value (in usd per share)	$ 0.001	$ 0.001
Preferred stock, depositary shares authorized	1,000,000	1,000,000
Preferred stock, depositary shares outstanding	1,000,000	1,000,000

Condensed Consolidated Statem_4

Condensed Consolidated Statements of Cash Flows - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
CASH FLOWS FROM OPERATING ACTIVITIES
Net (loss) income	$ 1,232	$ 2,964
Net income (loss) (attributable to parent)	1,440	3,074
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Depreciation, amortization and accretion (including amortization of nuclear fuel)	4,081	3,831
Equity in losses (earnings) of unconsolidated affiliates	2,004	(137)
Equity component of AFUDC	(112)	(99)
(Gains) losses on sales of other assets	(10)
Impairment charges	36	(16)
Deferred income taxes	210	736
Contributions to qualified pension plans		(77)
Payments for asset retirement obligations	(463)	(582)
Provision for rate refunds	(15)	61
Refund of AMT credit carryforwards	572
(Increase) decrease in
Net realized and unrealized mark-to-market and hedging transactions	87	(4)
Receivables	58	62
Inventory	43	(3)
Other current assets	199	(134)
Increase (decrease) in
Accounts payable	(563)	(538)
Taxes accrued	386	125
Other current liabilities	(284)	(198)
Other assets	(328)	(279)
Other liabilities	(367)	(75)
Net cash provided by operating activities	6,766	5,637
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(7,408)	(8,084)
Contributions to equity method investments	(276)	(264)
Purchases of debt and equity securities	(6,160)	(3,105)
Proceeds from sales and maturities of debt and equity securities	6,087	3,092
Other	(207)	(272)
Net cash used in investing activities	(7,964)	(8,633)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from the issuance of long-term debt	6,162	6,131
Proceeds from the issuance of preferred stock		1,963
Proceeds from the issuance of common stock	75	41
Payments for the redemption of long-term debt	(3,468)	(2,737)
Proceeds from the issuance of short-term debt with original maturities greater than 90 days	2,372	339
Payments for the redemption of short-term debt with original maturities greater than 90 days	(1,143)	(479)
Notes payable and commercial paper	(969)	(879)
Contributions from noncontrolling interests	402	615
Dividends paid	(2,113)	(1,990)
Other	(93)	(17)
Net cash provided by financing activities	1,225	2,987
Net increase (decrease) in cash, cash equivalents and restricted cash	27	(9)
Cash, cash equivalents and restricted cash at beginning of period	573	591
Cash, cash equivalents and restricted cash at end of period	600	582
Significant non-cash transactions:
Accrued capital expenditures	992	1,073
Non-cash dividends	82	81
Duke Energy Carolinas
CASH FLOWS FROM OPERATING ACTIVITIES
Net income (loss) (attributable to parent)	1,128	1,184
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Depreciation, amortization and accretion (including amortization of nuclear fuel)	1,295	1,227
Equity component of AFUDC	(46)	(29)
(Gains) losses on sales of other assets	(1)
Impairment charges	22	11
Deferred income taxes	(103)	96
Contributions to qualified pension plans		(7)
Payments for asset retirement obligations	(127)	(234)
Provision for rate refunds	(1)	34
(Increase) decrease in
Net realized and unrealized mark-to-market and hedging transactions		(7)
Receivables	41	(80)
Receivables from affiliated companies	50	74
Inventory	4	5
Other current assets	197	(117)
Increase (decrease) in
Accounts payable	(313)	(284)
Accounts payable to affiliated companies	(55)	(56)
Taxes accrued	352	91
Other current liabilities	(121)	44
Other assets	(71)	(2)
Other liabilities	(23)	(44)
Net cash provided by operating activities	2,228	1,906
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(1,931)	(1,984)
Purchases of debt and equity securities	(1,313)	(1,658)
Proceeds from sales and maturities of debt and equity securities	1,313	1,658
Notes receivable from affiliated companies	(65)
Other	(105)	(80)
Net cash used in investing activities	(2,101)	(2,064)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from the issuance of long-term debt	965	819
Payments for the redemption of long-term debt	(457)	(5)
Notes payable to affiliated companies	(29)	(390)
Distributions to parent	(600)	(275)
Other	(1)	(1)
Net cash provided by financing activities	(122)	148
Net increase (decrease) in cash, cash equivalents and restricted cash	5	(10)
Cash, cash equivalents and restricted cash at beginning of period	18	33
Cash, cash equivalents and restricted cash at end of period	23	23
Significant non-cash transactions:
Accrued capital expenditures	295	261
Progress Energy
CASH FLOWS FROM OPERATING ACTIVITIES
Net (loss) income	1,233	1,098
Net income (loss) (attributable to parent)	1,232	1,098
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Depreciation, amortization and accretion (including amortization of nuclear fuel)	1,734	1,649
Equity component of AFUDC	(30)	(48)
(Gains) losses on sales of other assets	(9)
Impairment charges	1	(25)
Deferred income taxes	(3)	342
Contributions to qualified pension plans		(57)
Payments for asset retirement obligations	(287)	(309)
Provision for rate refunds	4	13
(Increase) decrease in
Net realized and unrealized mark-to-market and hedging transactions	(13)	9
Receivables	(207)	(128)
Receivables from affiliated companies	32	135
Inventory	46	45
Other current assets	214	79
Increase (decrease) in
Accounts payable	(124)	(64)
Accounts payable to affiliated companies	(102)	(6)
Taxes accrued	263	150
Other current liabilities	(41)	(96)
Other assets	(145)	(282)
Other liabilities	(102)	(75)
Net cash provided by operating activities	2,464	2,430
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(2,602)	(2,866)
Purchases of debt and equity securities	(4,554)	(1,304)
Proceeds from sales and maturities of debt and equity securities	4,543	1,300
Notes receivable from affiliated companies	164
Other	(114)	(130)
Net cash used in investing activities	(2,563)	(3,000)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from the issuance of long-term debt	1,791	1,295
Payments for the redemption of long-term debt	(1,555)	(1,263)
Notes payable to affiliated companies	338	554
Distributions to parent	(400)
Other	(13)	8
Net cash provided by financing activities	161	594
Net increase (decrease) in cash, cash equivalents and restricted cash	62	24
Cash, cash equivalents and restricted cash at beginning of period	126	112
Cash, cash equivalents and restricted cash at end of period	188	136
Significant non-cash transactions:
Accrued capital expenditures	311	400
Duke Energy Progress
CASH FLOWS FROM OPERATING ACTIVITIES
Net income (loss) (attributable to parent)	711	650
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Depreciation, amortization and accretion (including amortization of nuclear fuel)	972	996
Equity component of AFUDC	(22)	(44)
(Gains) losses on sales of other assets	(8)
Impairment charges	5
Deferred income taxes	(33)	144
Contributions to qualified pension plans		(4)
Payments for asset retirement obligations	(249)	(288)
Provision for rate refunds	4	13
(Increase) decrease in
Net realized and unrealized mark-to-market and hedging transactions		(4)
Receivables	(34)	(9)
Receivables from affiliated companies	7	(11)
Inventory	24	15
Other current assets	82	65
Increase (decrease) in
Accounts payable	(185)	(54)
Accounts payable to affiliated companies	(59)	(80)
Taxes accrued	190	37
Other current liabilities	(24)	(17)
Other assets	(177)	(201)
Other liabilities	21	39
Net cash provided by operating activities	1,225	1,247
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(1,142)	(1,592)
Purchases of debt and equity securities	(1,269)	(656)
Proceeds from sales and maturities of debt and equity securities	1,238	632
Other	(31)	(56)
Net cash used in investing activities	(1,204)	(1,672)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from the issuance of long-term debt	1,296	1,270
Payments for the redemption of long-term debt	(985)	(603)
Notes payable to affiliated companies	101	(215)
Distributions to parent	(400)
Other	(12)	(1)
Net cash provided by financing activities		451
Net increase (decrease) in cash, cash equivalents and restricted cash	21	26
Cash, cash equivalents and restricted cash at beginning of period	22	23
Cash, cash equivalents and restricted cash at end of period	43	49
Significant non-cash transactions:
Accrued capital expenditures	124	182
Duke Energy Florida
CASH FLOWS FROM OPERATING ACTIVITIES
Net income (loss) (attributable to parent)	623	586
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Depreciation, amortization and accretion (including amortization of nuclear fuel)	755	647
Equity component of AFUDC	(8)	(4)
Impairment charges	(4)	(25)
Deferred income taxes	19	164
Contributions to qualified pension plans		(53)
Payments for asset retirement obligations	(38)	(21)
(Increase) decrease in
Net realized and unrealized mark-to-market and hedging transactions	(17)	9
Receivables	(172)	(119)
Receivables from affiliated companies	(3)	27
Inventory	22	29
Other current assets	41	100
Increase (decrease) in
Accounts payable	63	(11)
Accounts payable to affiliated companies	(54)	67
Taxes accrued	217	101
Other current liabilities	(20)	(77)
Other assets	48	(77)
Other liabilities	(136)	(123)
Net cash provided by operating activities	1,336	1,220
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(1,460)	(1,274)
Purchases of debt and equity securities	(3,284)	(648)
Proceeds from sales and maturities of debt and equity securities	3,305	668
Notes receivable from affiliated companies	173
Other	(82)	(73)
Net cash used in investing activities	(1,348)	(1,327)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from the issuance of long-term debt	495	25
Payments for the redemption of long-term debt	(570)	(210)
Notes payable to affiliated companies	66	248
Other		9
Net cash provided by financing activities	(9)	72
Net increase (decrease) in cash, cash equivalents and restricted cash	(21)	(35)
Cash, cash equivalents and restricted cash at beginning of period	56	75
Cash, cash equivalents and restricted cash at end of period	35	40
Significant non-cash transactions:
Accrued capital expenditures	187	218
Duke Energy Ohio
CASH FLOWS FROM OPERATING ACTIVITIES
Net income (loss) (attributable to parent)	201	190
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Depreciation, amortization and accretion (including amortization of nuclear fuel)	211	202
Equity component of AFUDC	(4)	(9)
Deferred income taxes	31	68
Contributions to qualified pension plans		(2)
Payments for asset retirement obligations	(1)	(7)
Provision for rate refunds	10	5
(Increase) decrease in
Receivables	(5)	24
Receivables from affiliated companies	35	51
Inventory	5	(2)
Other current assets	5	(15)
Increase (decrease) in
Accounts payable	(28)	(40)
Accounts payable to affiliated companies	(14)	(9)
Taxes accrued	(23)	(40)
Other current liabilities	6	(4)
Other assets	(24)	(12)
Other liabilities	(7)	(22)
Net cash provided by operating activities	398	378
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(611)	(714)
Notes receivable from affiliated companies		(74)
Other	(34)	(45)
Net cash used in investing activities	(645)	(833)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from the issuance of long-term debt	467	1,003
Payments for the redemption of long-term debt		(451)
Notes payable to affiliated companies	(227)	(107)
Net cash provided by financing activities	240	445
Net increase (decrease) in cash, cash equivalents and restricted cash	(7)	(10)
Cash, cash equivalents and restricted cash at beginning of period	17	21
Cash, cash equivalents and restricted cash at end of period	10	11
Significant non-cash transactions:
Accrued capital expenditures	92	100
Duke Energy Indiana
CASH FLOWS FROM OPERATING ACTIVITIES
Net income (loss) (attributable to parent)	299	363
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Depreciation, amortization and accretion (including amortization of nuclear fuel)	416	395
Equity component of AFUDC	(18)	(13)
Deferred income taxes	11	108
Contributions to qualified pension plans		(2)
Payments for asset retirement obligations	(48)	(31)
(Increase) decrease in
Receivables	15	1
Receivables from affiliated companies	(5)	37
Inventory	10	(56)
Other current assets	12	91
Increase (decrease) in
Accounts payable	(1)	1
Accounts payable to affiliated companies	(22)	(9)
Taxes accrued	65	(14)
Other current liabilities	(2)	(12)
Other assets	(41)	(75)
Other liabilities	104	67
Net cash provided by operating activities	795	851
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(669)	(663)
Purchases of debt and equity securities	(24)	(19)
Proceeds from sales and maturities of debt and equity securities	15	15
Notes receivable from affiliated companies		(213)
Other	(24)	(33)
Net cash used in investing activities	(702)	(913)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from the issuance of long-term debt	544	485
Payments for the redemption of long-term debt	(500)	(60)
Notes payable to affiliated companies	53	(167)
Distributions to parent	(200)	(200)
Net cash provided by financing activities	(103)	58
Net increase (decrease) in cash, cash equivalents and restricted cash	(10)	(4)
Cash, cash equivalents and restricted cash at beginning of period	25	24
Cash, cash equivalents and restricted cash at end of period	15	20
Significant non-cash transactions:
Accrued capital expenditures	73	82
Piedmont Natural Gas
CASH FLOWS FROM OPERATING ACTIVITIES
Net income (loss) (attributable to parent)	155	97
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Depreciation, amortization and accretion (including amortization of nuclear fuel)	135	129
Equity in losses (earnings) of unconsolidated affiliates	(7)	(6)
Equity component of AFUDC	(14)
Impairment charges	7
Deferred income taxes	24	110
Contributions to qualified pension plans		(1)
Provision for rate refunds	(27)	9
(Increase) decrease in
Receivables	164	192
Receivables from affiliated companies	(1)	12
Inventory	25	23
Other current assets	(59)	(95)
Increase (decrease) in
Accounts payable	(53)	(93)
Accounts payable to affiliated companies	60	12
Taxes accrued	16	(51)
Other current liabilities	(4)	(6)
Other assets	(14)	(10)
Other liabilities	7	(5)
Net cash provided by operating activities	414	317
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(641)	(751)
Contributions to equity method investments		(16)
Other	(18)	(10)
Net cash used in investing activities	(659)	(777)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from the issuance of long-term debt	394	596
Payments for the redemption of long-term debt		(350)
Notes payable to affiliated companies	(149)	64
Capital contributions from parent		150
Net cash provided by financing activities	245	460
Significant non-cash transactions:
Accrued capital expenditures	$ 123	$ 121

Condensed Consolidated Statem_5

Condensed Consolidated Statements of Changes in Equity - USD ($) $ in Millions		Total		Preferred Stock	Common Stockholders' Equity		Common Stock	Additional Paid-in Capital	Retained Earnings		Accumulated Other Comprehensive (Loss) Income, Net (Losses) Gains on Cash Flow Hedges		Accumulated Other Comprehensive (Loss) Income, Net Unrealized (Losses) Gains on Available-for-Sale-Securities		Accumulated Other Comprehensive (Loss) Income, Pension and OPEB Adjustments		Noncontrolling Interests	Duke Energy Carolinas		Duke Energy CarolinasMember's Equity		Duke Energy CarolinasAccumulated Other Comprehensive (Loss) Income, Net (Losses) Gains on Cash Flow Hedges	Progress Energy	Progress EnergyCommon Stockholders' Equity	Progress EnergyAdditional Paid-in Capital	Progress EnergyRetained Earnings		Progress EnergyAccumulated Other Comprehensive (Loss) Income, Net (Losses) Gains on Cash Flow Hedges		Progress EnergyAccumulated Other Comprehensive (Loss) Income, Net Unrealized (Losses) Gains on Available-for-Sale-Securities	Progress EnergyAccumulated Other Comprehensive (Loss) Income, Pension and OPEB Adjustments		Progress EnergyNoncontrolling Interests	Duke Energy Progress	Duke Energy ProgressMember's Equity	Duke Energy Florida	Duke Energy FloridaMember's Equity	Duke Energy FloridaAccumulated Other Comprehensive (Loss) Income, Net Unrealized (Losses) Gains 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 IndianaMember's Equity	Piedmont Natural Gas	Piedmont Natural GasCommon Stock	Piedmont Natural GasRetained Earnings	Preferred stock, Series A	[2]	Preferred stock, Series APreferred Stock		Preferred stock, Series ACommon Stockholders' Equity	[2]	Preferred stock, Series B	[3]	Preferred stock, Series BPreferred Stock		Preferred stock, Series BCommon Stockholders' Equity	[3]	Common Stock	Common StockCommon Stockholders' Equity	Common StockCommon Stock	Common StockAdditional Paid-in Capital
Beginning Balance at Dec. 31, 2018		$ 43,834			$ 43,817		$ 1	$ 40,795	$ 3,113		$ (14)		$ (3)		$ (75)		$ 17						$ 14,257	$ 14,254	$ 9,143	$ 5,131		$ (12)		$ (1)	$ (7)		$ 3
Beginning Balance, in shares at Dec. 31, 2018							727,000,000
Beginning Balance (member's equity) at Dec. 31, 2018																		$ 11,683		$ 11,689		$ (6)													$ 8,441	$ 6,095	$ 6,097	$ (2)						$ 4,339
Beginning Balance (parent) at Dec. 31, 2018																																							$ 3,445	$ 762	$ 2,776	$ (93)			$ 2,091	$ 1,160	$ 931
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		2,937			3,047				3,047								(110)
Net income (loss) (attributable to parent)		3,074																1,184		1,184			1,098											$ 650	650	586	586		190			190	$ 363	363	97		97
Net (loss) income		2,964																					1,098	1,098		1,098
Other comprehensive income (loss)		(47)	[1]		(47)						(58)		10		1								8	8				4		2	2					2		2
Stock issuances																																																$ 973		$ 973	[2]	$ 973		$ 990		$ 990	[3]	$ 990		$ 158	$ 158		$ 158
Stock issuances, in shares																																																		40,000,000												2,000,000
Common stock dividends		(2,044)			(2,044)				(2,044)									(275)		(275)																								(200)
Sale of noncontrolling interest	[4]	408			(455)			(465)			10						863
Contribution from noncontrolling interest in subsidiaries	[5]	200															200
Distributions to noncontrolling interest in subsidiaries		(1)															(1)
Contribution from parent																																													150	150
Other		(1)	[6]		(1)	[6]			23	[6]	(6)	[6]	(1)	[6]	(17)	[6]		(1)				(1)				7	[7]	(4)	[7]	(1)	(2)	[7]
Ending Balance at Sep. 30, 2019		47,407		$ 1,963	46,438		$ 1	40,488	4,139		(68)		6		(91)		969						15,363	15,360	9,143	6,236		(12)			(7)		3
Ending Balance (member's equity) at Sep. 30, 2019																		12,591		12,598		(7)													9,091	6,683	6,683							4,502
Ending Balance, in shares at Sep. 30, 2019							729,000,000
Ending Balance (parent) at Sep. 30, 2019																																							3,635	762	2,776	97			2,338	1,310	1,028
Beginning Balance at Jun. 30, 2019		45,332		973	45,213		$ 1	40,885	3,502		(63)		4		(89)		119						14,839	14,837	9,143	5,715		(13)			(8)		2
Beginning Balance, in shares at Jun. 30, 2019							728,000,000
Beginning Balance (member's equity) at Jun. 30, 2019																		12,276		12,283		(7)													8,813	6,393	6,394	(1)						4,546
Beginning Balance (parent) at Jun. 30, 2019																																							3,561	762	2,776	23			2,356	1,310	1,046
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		1,308			1,327				1,327								(19)
Net income (loss) (attributable to parent)		1,342																590		590			521											278	278	289	289		74			74	156	156	(18)		(18)
Net (loss) income		1,323																					521	521		521
Other comprehensive income (loss)		(15)	[1]		(15)						(15)		2		(2)								2	2				1		1						1		1
Stock issuances																																																						$ 990		$ 990	[3]	$ 990		69	69		69
Stock issuances, in shares																																																								1,000,000						1,000,000
Common stock dividends		(690)			(690)				(690)									(275)		(275)																								(200)
Sale of noncontrolling interest	[4]	408			(455)			(465)			10						863
Contribution from noncontrolling interest in subsidiaries		7															7
Other		(2)			(1)			(1)									(1)						1							(1)	1		1
Ending Balance at Sep. 30, 2019		47,407		1,963	46,438		$ 1	40,488	4,139		(68)		6		(91)		969						15,363	15,360	9,143	6,236		(12)			(7)		3
Ending Balance (member's equity) at Sep. 30, 2019																		12,591		12,598		(7)													9,091	6,683	6,683							4,502
Ending Balance, in shares at Sep. 30, 2019							729,000,000
Ending Balance (parent) at Sep. 30, 2019																																							$ 3,635	762	2,776	97			$ 2,338	1,310	1,028
Beginning Balance at Dec. 31, 2019		$ 47,951		1,962	46,822		$ 1	40,881	4,108		(51)		3		(82)		1,129						$ 15,593	15,590	9,143	6,465		(10)		(1)	(7)		3
Beginning Balance, in shares at Dec. 31, 2019		733,000,000					733,000,000																100																90,000,000						100
Beginning Balance (member's equity) at Dec. 31, 2019																		12,811		12,818		(7)												9,246	9,246	6,788	6,789	(1)					4,575	4,575
Beginning Balance (parent) at Dec. 31, 2019		$ 46,822																					$ 15,590																$ 3,683	762	2,776	145			$ 2,443	1,310	1,133
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		1,139			1,347				1,347								(208)
Net income (loss) (attributable to parent)		1,440																1,128		1,128			1,232											711	711	623	623		$ 201			201	299	299	155		155
Net (loss) income		1,232																					1,233	1,232		1,232							1
Other comprehensive income (loss)		(145)	[1]		(133)						(139)		5		1		(12)						5	5				3		1	1					1		1
Stock issuances																																																												181	181		181
Stock issuances, in shares																																																														3,000,000
Common stock dividends		(2,103)			(2,103)				(2,103)									(600)		(600)			(400)	(400)		(400)									(400)									(200)
Contribution from noncontrolling interest in subsidiaries	[5]	385			(17)			(17)									402
Distributions to noncontrolling interest in subsidiaries		(22)															(22)						(1)										(1)
Other		(91)	[8]		(91)	[8]		1	(92)	[8]								(13)	[9]	(13)	[9]		(1)	(1)		(1)									(1)	(1)	(1)								$ (1)		(1)
Ending Balance at Sep. 30, 2020		$ 47,295		1,962	46,006		$ 1	41,046	3,260		(190)		8		(81)		1,289						$ 16,429	16,426	9,143	7,296		(7)			(6)		3
Ending Balance (member's equity) at Sep. 30, 2020																		13,326		13,333		(7)												9,556	9,556	7,411	7,411						4,674	4,674
Ending Balance, in shares at Sep. 30, 2020		736,000,000					736,000,000																100																90,000,000						100
Ending Balance (parent) at Sep. 30, 2020		$ 46,006																					$ 16,426																$ 3,884	762	2,776	346			$ 2,597	1,310	1,287
Beginning Balance at Jun. 30, 2020		46,611		1,962	45,484		$ 1	40,997	2,707		(111)		10		(82)		1,127						16,221	16,218	9,143	7,090		(8)		(1)	(6)		3
Beginning Balance, in shares at Jun. 30, 2020							735,000,000
Beginning Balance (member's equity) at Jun. 30, 2020																		13,072		13,079		(7)													9,610	7,124	7,125	(1)						4,655
Beginning Balance (parent) at Jun. 30, 2020																																							3,814	762	2,776	276			2,622	1,310	1,312
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		1,195			1,265				1,265								(70)
Net income (loss) (attributable to parent)		1,304																555		555			605											346	346	287	287		$ 70			70	119	119	$ (25)		(25)
Net (loss) income		1,234																					606	605		605							1
Other comprehensive income (loss)		(80)	[1]		(80)						(79)		(2)		1								2	2				1		$ 1						1		$ 1
Stock issuances																																																												$ 65	$ 65		$ 65
Stock issuances, in shares																																																														1,000,000
Common stock dividends		(712)			(712)				(712)									(300)		(300)			(400)	(400)		(400)									(400)									(100)
Contribution from noncontrolling interest in subsidiaries	[5]	222			(17)			(17)									239
Distributions to noncontrolling interest in subsidiaries		(8)															(8)
Other		2			1			1									1	(1)		(1)				1		1							(1)			(1)	(1)
Ending Balance at Sep. 30, 2020		$ 47,295		$ 1,962	$ 46,006		$ 1	$ 41,046	$ 3,260		$ (190)		$ 8		$ (81)		$ 1,289						$ 16,429	$ 16,426	$ 9,143	$ 7,296		$ (7)			$ (6)		$ 3
Ending Balance (member's equity) at Sep. 30, 2020																		$ 13,326		$ 13,333		$ (7)												$ 9,556	$ 9,556	$ 7,411	$ 7,411						$ 4,674	$ 4,674
Ending Balance, in shares at Sep. 30, 2020		736,000,000					736,000,000																100																90,000,000						100
Ending Balance (parent) at Sep. 30, 2020		$ 46,006																					$ 16,426																$ 3,884	$ 762	$ 2,776	$ 346			$ 2,597	$ 1,310	$ 1,287
[1]	Net of income tax impacts of approximately $24 million for the three months ended September 30, 2020 , and $43 million and $14 million for the nine months ended September 30, 2020 , and 2019 , respectively. All other periods presented include immaterial income tax impacts.
[2]	Duke Energy issued 40 million depositary shares of preferred stock, Series A.
[3]	Duke Energy issued 1 million shares of preferred stock, series B, in the third quarter of 2019.
[4]	See Note 2 for additional discussion of the transaction.
[5]	Relates to tax equity financing activity in the Commercial Renewables segment.
[6]	Amounts in Retained Earnings and Accumulated Other Comprehensive (Loss) Income 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 and Accumulated Other Comprehensive (Loss) Income 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.
[8]	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.
[9]	Amounts primarily represent impacts due to implementation of a new accounting standard related to Current Estimated Credit Losses. See Note 1 for additional discussion.

Condensed Consolidated Statem_6

Condensed Consolidated Statements of Changes in Equity (Parenthetical) - Preferred Stock - shares	3 Months Ended	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2019
Preferred stock, Series A
Stock issuances, in shares		40,000,000
Preferred stock, Series B
Stock issuances, in shares	1,000,000

Organization and Basis of Prese

Organization and Basis of Presentation	9 Months Ended
	Sep. 30, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization and Basis of Presentation	Index to Combined Notes to Condensed Consolidated Financial Statements The unaudited notes to the Condensed Consolidated Financial Statements that follow are a combined presentation. The following list indicates the registrants to which the footnotes apply. Applicable Notes Registrant 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 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. BASIS OF PRESENTATION These Condensed Consolidated Financial Statements have been prepared in accordance with GAAP for interim financial information and with the instructions to Form 10-Q and Regulation S-X. Accordingly, these Condensed Consolidated Financial Statements do not include all information and notes required by GAAP for annual financial statements and should be read in conjunction with the Consolidated Financial Statements in the Duke Energy Registrants’ combined Annual Report on Form 10-K for the year ended December 31, 2019 . The information in these combined notes relates to each of the Duke Energy Registrants as noted in the Index to Combined Notes to Condensed Consolidated Financial Statements. However, none of the registrants make any representations as to information related solely to Duke Energy or the subsidiaries of Duke Energy other than itself. These Condensed Consolidated Financial Statements, in the opinion of the respective companies’ management, reflect all normal recurring adjustments necessary to fairly present the financial position and results of operations of each of the Duke Energy Registrants. Amounts reported in Duke Energy’s interim Condensed Consolidated Statements of Operations and each of the Subsidiary Registrants’ interim Condensed Consolidated Statements of Operations and Comprehensive Income are not necessarily indicative of amounts expected for the respective annual periods due to effects of seasonal temperature variations on energy consumption, regulatory rulings, timing of maintenance on electric generating units, changes in mark-to-market valuations, changing commodity prices and other factors. In preparing financial statements that conform to GAAP, management 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. BASIS OF CONSOLIDATION These Condensed 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 12 for additional information on VIEs. These Condensed Consolidated Financial Statements also reflect the Duke Energy Registrants’ proportionate share of certain jointly owned generation and transmission facilities. COVID-19 The COVID-19 pandemic is having a significant impact on global health and economic environments. In March 2020, the World Health Organization declared COVID-19 a global pandemic, and President Trump proclaimed that the COVID-19 outbreak in the United States constitutes a national emergency. The Duke Energy Registrants are monitoring developments closely and responding appropriately. The company incurred approximately $39 million and $91 million of incremental COVID-19 costs before deferral for the three and nine months ended September 30, 2020 , respectively, included in Operation, maintenance and other on the Condensed Consolidated Statements of Operations. For the nine months ended September 30, 2020 , the company has deferred approximately $56 million of these incremental costs, which were primarily bad debt expense, personal protective equipment and cleaning supplies. Further, the company waived approximately $29 million and $54 million of late payment fees for the three and nine months ended September 30, 2020 , respectively. See Notes 3 , 5 , 12 , 13 and 16 for additional information as well as steps taken to mitigate the impacts to our business and customers from the COVID-19 pandemic. OTHER CURRENT ASSETS Included in Other within Current Assets on the Piedmont Condensed Consolidated Balance Sheets are prepaid assets of $23 million and $3 million as of September 30, 2020 , and December 31, 2019 , respectively. The prepaid assets relate to natural gas storage injections and inventory transfers classified as prepaid assets until winter season when the natural gas is moved to Inventory on the Piedmont Condensed Consolidated Balance Sheets under certain agreements. OTHER CURRENT LIABILITIES Included in Other within Current Liabilities on the Duke Energy Condensed Consolidated Balance Sheet is a current liability of $935 million and $0 as of September 30, 2020 , and December 31, 2019 , respectively. The current liability, initially recorded in the second quarter and increased during the third quarter, primarily represents Duke Energy's share of ACP's obligations of outstanding debt and to satisfy ARO requirements to restore construction sites. See Notes 3 , 4 and 12 for further information. 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 Condensed Consolidated Balance Sheet. Several operating agreements of Duke Energy's subsidiaries with noncontrolling interest are subject to allocations of earnings, 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 Hypothetical Liquidation at Book Value (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 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 . The following table presents cash received for the sale of noncontrolling interest and allocated losses to noncontrolling interest for the three and nine months ended September 30, 2020 , and 2019 . Three Months Ended September 30, Nine Months Ended September 30, (in millions) 2020 2019 2020 2019 Noncontrolling Interest Capital Contributions Cash received for the sale of noncontrolling interest to tax equity members $ 239 $ 7 $ 402 $ 200 Cash received for the sale of noncontrolling interest to pro rata share members — — — 415 Total Noncontrolling Interest Capital Contributions 239 7 402 615 Noncontrolling Interest Allocation of Income Allocated losses to noncontrolling tax equity members utilizing the HLBV method 59 15 187 105 Allocated losses to noncontrolling members based on pro rata shares of ownership 11 4 21 5 Total Noncontrolling Interest Allocated Losses $ 70 $ 19 $ 208 $ 110 CASH, CASH EQUIVALENTS AND RESTRICTED CASH Duke Energy, Progress Energy and Duke Energy Florida have restricted cash balances related primarily to collateral assets, escrow deposits and VIEs. See Notes 10 and 12 for additional information. Restricted cash amounts are included in Other within Current Assets and Other Noncurrent Assets on the Condensed Consolidated Balance Sheets. The following table presents the components of cash, cash equivalents and restricted cash included in the Condensed Consolidated Balance Sheets. September 30, 2020 December 31, 2019 Duke Duke Duke Progress Energy Duke Progress Energy Energy Energy Florida Energy Energy Florida Current Assets Cash and cash equivalents $ 308 $ 70 $ 19 $ 311 $ 48 $ 17 Other 187 16 16 222 39 39 Other Noncurrent Assets Other 105 102 — 40 39 — Total cash, cash equivalents and restricted cash $ 600 $ 188 $ 35 $ 573 $ 126 $ 56 INVENTORY Provisions for inventory write-offs were not material at September 30, 2020 , and December 31, 2019 . The components of inventory are presented in the tables below. September 30, 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 $ 2,341 $ 779 $ 1,021 $ 682 $ 340 $ 79 $ 314 $ 13 Coal 546 173 168 120 48 12 192 — Natural gas, oil and other fuel 303 40 189 108 80 39 1 34 Total inventory $ 3,190 $ 992 $ 1,378 $ 910 $ 468 $ 130 $ 507 $ 47 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 Materials and supplies $ 2,297 $ 768 $ 1,038 $ 686 $ 351 $ 79 $ 318 $ 5 Coal 586 187 186 138 48 15 198 — Natural gas, oil and other fuel 349 41 199 110 90 41 1 67 Total inventory $ 3,232 $ 996 $ 1,423 $ 934 $ 489 $ 135 $ 517 $ 72 NEW ACCOUNTING STANDARDS The following new accounting standard was adopted by the Duke Energy Registrants in 2020 . Current Expected Credit Losses. In June 2016, the Financial Accounting Standards Board (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. Duke Energy reviews the credit quality of its counterparties as part of its regular risk management process and requires credit enhancements, such as deposits or letters of credit, as appropriate and as allowed by regulators. Duke Energy recorded cumulative effects of changes in accounting principles related to the adoption of new credit loss standard, for allowances for credit losses of trade and other receivables, insurance receivables and financial guarantees. These amounts are included in the Condensed Consolidated Balance Sheets in Receivables, Receivables of VIEs, Other Noncurrent Assets and Other Noncurrent Liabilities. See Notes 4 and 13 for more information. 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 The following new accounting standard has been issued but not yet adopted by the Duke Energy Registrants as of September 30, 2020 . 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 by the end of 2021. 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 2021 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 2021. 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.

Business Segments

Business Segments	9 Months Ended
	Sep. 30, 2020
Segment Reporting [Abstract]
Business Segments	BUSINESS SEGMENTS 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 primarily includes Duke Energy's regulated electric utilities in the Carolinas, Florida and the Midwest. 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. The Commercial Renewables segment is primarily comprised of nonregulated utility-scale wind and solar generation assets located throughout the U.S. In 2020, Duke Energy continues to evaluate recoverability of a renewable merchant plant located in the Electric Reliability Council of Texas West market due to declining market pricing and declining long-term forecasted energy prices, primarily driven by lower forecasted natural gas prices. Duke Energy determined that the asset was not impaired as of September 30, 2020, because the carrying value of approximately $150 million approximates the aggregate estimated future undiscounted cash flows. A continued decline in energy market pricing would likely result in a future impairment. Duke Energy retained 51% ownership interest in this facility following the 2019 transaction to sell a minority interest in certain renewable assets. 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, Duke Energy’s wholly owned captive insurance company, Bison, and Duke Energy's ownership interest in National Methanol Company. Business segment information is presented in the following tables. Segment assets presented exclude intercompany assets. Three Months Ended September 30, 2020 Electric Gas Total Utilities and Utilities and Commercial Reportable (in millions) Infrastructure Infrastructure Renewables Segments Other Eliminations Total Unaffiliated revenues $ 6,371 $ 217 $ 126 $ 6,714 $ 7 $ — $ 6,721 Intersegment revenues 8 24 — 32 17 (49 ) — Total revenues $ 6,379 $ 241 $ 126 $ 6,746 $ 24 $ (49 ) $ 6,721 Segment income (loss) (a)(b) $ 1,381 $ (73 ) $ 60 $ 1,368 $ (103 ) $ — $ 1,265 Less: Noncontrolling interests 70 Add: Preferred stock dividend 39 Net Income $ 1,234 Segment assets $ 138,142 $ 13,343 $ 6,541 $ 158,026 $ 3,387 $ (4 ) $ 161,409 Three Months Ended September 30, 2019 Electric Gas Total Utilities and Utilities and Commercial Reportable (in millions) Infrastructure Infrastructure Renewables Segments Other Eliminations Total Unaffiliated revenues $ 6,569 $ 225 $ 138 $ 6,932 $ 8 $ — $ 6,940 Intersegment revenues 8 24 — 32 17 (49 ) — Total revenues $ 6,577 $ 249 $ 138 $ 6,964 $ 25 $ (49 ) $ 6,940 Segment income (loss) (c) $ 1,385 $ 26 $ 40 $ 1,451 $ (124 ) $ — $ 1,327 Less: Noncontrolling interests 19 Add: Preferred stock dividend 15 Net Income $ 1,323 (a) Electric Utilities and Infrastructure includes $19 million recorded within Impairment charges and $8 million recorded within Operations, maintenance and other on the Duke Energy Carolinas' Condensed Consolidated Statements of Operations related to a partial settlement in the Duke Energy Carolinas' 2019 North Carolina rate case and $8 million recorded within Operations, maintenance and other on Duke Energy Progress' Condensed Consolidated Statements of Operation related to a partial settlement in the Duke Energy Progress' 2019 North Carolina rate case. See Note 3 for more information. Additionally, Electric Utilities and Infrastructure includes $5 million of Impairment charges related to gas pipeline assets recorded on Duke Energy Progress' Condensed Consolidated Statements of Operations. (b) Gas Utilities and Infrastructure includes $78 million recorded within Equity in (losses) earnings of unconsolidated affiliates on the Condensed Consolidated Statements of Operations and $7 million in Impairment charges recorded on the Piedmont Condensed Consolidated Statements of Operations related to gas pipeline investments. (c) Electric Utilities and Infrastructure includes a $25 million reduction of a prior year impairment recorded at Citrus County CC related to the plant's cost cap and is recorded within Impairment charges on Duke Energy Florida's Condensed Consolidated Statements of Operations. Nine Months Ended September 30, 2020 Electric Gas Total Utilities and Utilities and Commercial Reportable (in millions) Infrastructure Infrastructure Renewables Segments Other Eliminations Total Unaffiliated revenues $ 16,571 $ 1,122 $ 378 $ 18,071 $ 20 $ — $ 18,091 Intersegment revenues 25 72 — 97 53 (150 ) — Total revenues $ 16,596 $ 1,194 $ 378 $ 18,168 $ 73 $ (150 ) $ 18,091 Segment income (loss) (a)(b)(c) $ 2,839 $ (1,400 ) $ 207 $ 1,646 $ (299 ) $ — $ 1,347 Less: Noncontrolling interests 208 Add: Preferred stock dividend 93 Net Income $ 1,232 Nine Months Ended September 30, 2019 Electric Gas Total Utilities and Utilities and Commercial Reportable (in millions) Infrastructure Infrastructure Renewables Segments Other Eliminations Total Unaffiliated revenues $ 17,357 $ 1,239 $ 362 $ 18,958 $ 18 $ — $ 18,976 Intersegment revenues 24 72 — 96 53 (149 ) — Total revenues $ 17,381 $ 1,311 $ 362 $ 19,054 $ 71 $ (149 ) $ 18,976 Segment income (loss) (d) $ 2,944 $ 292 $ 139 $ 3,375 $ (328 ) $ — $ 3,047 Less: Noncontrolling interests 110 Add: Preferred stock dividend 27 Net Income $ 2,964 (a) Electric Utilities and Infrastructure includes $19 million recorded within Impairment charges and $8 million recorded within Operations, maintenance and other on the Duke Energy Carolinas' Condensed Consolidated Statements of Operations related to a partial settlement in the Duke Energy Carolinas' 2019 North Carolina rate case and $8 million recorded within Operations, maintenance and other on Duke Energy Progress' Condensed Consolidated Statements of Operation related to a partial settlement in the Duke Energy Progress' 2019 North Carolina rate case. See Note 3 for more information. Additionally, Electric Utilities and Infrastructure includes $5 million of Impairment charges related to gas pipeline assets recorded on Duke Energy Progress' Condensed Consolidated Statements of Operations. (b) Gas Utilities and Infrastructure includes $2.1 billion recorded within Equity in (losses) earnings of unconsolidated affiliates on the Condensed Consolidated Statements of Operations and $7 million of Impairment charges recorded on the Piedmont Condensed Consolidated Statements of Operations related to gas pipeline investments. See Notes 3 and 12 for additional information. (c) Other includes a $98 million reversal, included in Operations, maintenance and other on the Condensed Consolidated Statements of Operations, of 2018 severance costs due to a partial settlement in the Duke Energy Carolinas' 2019 North Carolina rate case. See Note 3 for additional information. (d) Electric Utilities and Infrastructure includes a $25 million reduction of a prior year impairment recorded at Citrus County CC related to the plant's costs cap and is recorded within Impairment charges on Duke Energy Florida's Condensed Consolidated Statements of Operations. Duke Energy Ohio Duke Energy Ohio has two reportable segments, Electric Utilities and Infrastructure and Gas Utilities and Infrastructure. The remainder of Duke Energy Ohio's operations is presented as Other. Three Months Ended September 30, 2020 Electric Gas Total Utilities and Utilities and Reportable (in millions) Infrastructure Infrastructure Segments Other Eliminations Total Total revenues $ 394 $ 79 $ 473 $ — $ — $ 473 Segment income/Net income $ 63 $ 9 $ 72 $ (2 ) $ — $ 70 Segment assets $ 6,448 $ 3,297 $ 9,745 $ 27 $ (23 ) $ 9,749 Three Months Ended September 30, 2019 Electric Gas Total Utilities and Utilities and Reportable (in millions) Infrastructure Infrastructure Segments Other Total Total revenues $ 408 $ 81 $ 489 $ — $ 489 Segment income/Net income $ 62 $ 13 $ 75 $ (1 ) $ 74 Nine Months Ended September 30, 2020 Electric Gas Total Utilities and Utilities and Reportable (in millions) Infrastructure Infrastructure Segments Other Total Total revenues $ 1,070 $ 324 $ 1,394 $ — $ 1,394 Segment income/Net (loss) income $ 137 $ 68 $ 205 $ (4 ) $ 201 Nine Months Ended September 30, 2019 Electric Gas Total Utilities and Utilities and Reportable (in millions) Infrastructure Infrastructure Segments Other Total Total revenues $ 1,099 $ 354 $ 1,453 $ — $ 1,453 Segment income/Net (loss) income $ 129 $ 65 $ 194 $ (4 ) $ 190

Regulatory Matters

Regulatory Matters	9 Months Ended
	Sep. 30, 2020
Regulated Operations [Abstract]
Regulatory Matters	REGULATORY MATTERS 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 COVID-19 Filings North Carolina On March 10, 2020, Governor Roy Cooper declared a state of emergency due to the COVID-19 pandemic. On March 19, 2020, the NCUC issued an order directing that utilities under its jurisdiction suspend disconnections for nonpayment of utility bills during the state of emergency and allow for customers to enter into payment arrangements to pay off arrearages accumulated during the state of emergency after the end of the state of emergency. Additionally, to help mitigate the financial impacts of the COVID-19 pandemic on their customers, on March 19, 2020, Duke Energy Carolinas and Duke Energy Progress filed a request with the NCUC seeking authorization to waive: (1) any late payment charges incurred by a residential or nonresidential customer, effective March 21, 2020; (2) the application of fees for checks returned for insufficient funds for residential and nonresidential customers; (3) the reconnection charge when a residential or nonresidential customer seeks to have service restored for those customers whose service was recently disconnected for nonpayment and to work with customers regarding the other requirements to restore service, including re-establishment of credit; and (4) the fees and charges associated with the use of credit cards or debit cards to pay residential electric utility bills, effective March 21, 2020. The NCUC granted the companies’ request on March 20, 2020. On July 29, 2020, the NCUC issued its Order Lifting Disconnection Moratorium and Allowing Collection of Arrearages Pursuant to Special Repayment Plans. The order contained the following: (1) public utilities may resume customer disconnections due to nonpayment for bills first rendered on or after September 1, 2020, after appropriate notice; (2) the late fee moratorium will continue through the end of the state of emergency or until further order of the commission; (3) Duke Energy utilities may reinstate fees for checks returned for insufficient funds as well as transaction fees for use of credit cards or debit cards for bills first rendered on or after September 1, 2020; and (4) no sooner than September 1, 2020, the collection of past-due or delinquent accounts accrued up to and including August 31, 2020, may proceed subject to conditions. Duke Energy Carolinas and Duke Energy Progress resumed normal billing practices as of October 1, 2020, with the exception of the billing of late payment charges. Customers were notified of the resumption of normal billing practices, the option of deferred payment arrangements and where to find assistance, if necessary. Service disconnections for nonpayment for residential customers resumed on November 2, 2020. 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 waived customer fees due to the COVID-19 pandemic. On October 30, 2020, the NCUC issued an order extending deadlines to file comments on the joint petition to November 5, 2020, and reply comments to November 30, 2020. Duke Energy Carolinas and Duke Energy Progress cannot predict the outcome of this matter. South Carolina On March 13, 2020, Governor Henry McMaster declared a state of emergency due to the COVID-19 pandemic. The governor also issued a letter on March 14, 2020, to the ORS Executive Director regarding the suspension of disconnection of essential utility services for nonpayment. On March 18, 2020, the PSCSC issued an order approving such waivers, and also approved waivers for regulations related to late fees and reconnect fees. The PSCSC's order also required utilities to track the financial impacts of actions taken pursuant to such waivers for possible reporting to the PSCSC. On May 13, 2020, the ORS filed a letter with the PSCSC that included a request from Governor McMaster that utilities proceed with developing and implementing plans for phasing in normal business operations. On May 14, 2020, the PSCSC conditionally vacated the regulation waivers regarding termination of service and suspension of disconnect fees. Prior to termination, utilities are to refer past-due customers to local organizations for assistance and/or deferred payment arrangements. Duke Energy Carolinas and Duke Energy Progress filed a report on June 30, 2020, as required by PSCSC order, reporting revenue impact, costs and savings related to COVID-19 to date. On August 14, 2020, Duke Energy Carolinas and Duke Energy Progress filed a joint petition with the PSCSC for approval of an accounting order to defer incremental COVID-19 related costs incurred through June 30, 2020, and for the ongoing months during the duration of the COVID-19 pandemic. The deferral request did not include lost revenues. Updates on cost impacts were filed on September 30, 2020 , and included financial impacts through the end of August 2020. On October 16, 2020, the ORS requested the PSCSC delay taking formal action on the deferral request until the ORS and any intervenors complete discovery. The PSCSC issued an order on October 21, 2020, to grant additional time to complete discovery until January 20, 2021, and to establish a procedural schedule. On August 17, 2020, Duke Energy Carolinas and Duke Energy Progress filed an update on their planned return to normal operations during the COVID-19 pandemic. Normal billing practices resumed in South Carolina as of October 1, 2020, and service disconnections for nonpayment resumed on October 12, 2020. Customers were notified of the resumption of normal billing practices, the option of payment arrangements and where to find assistance, if necessary. Duke Energy Carolinas and Duke Energy Progress cannot predict the outcome of this matter. 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 each utilities’ 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. The total revenue requirement over the proposed 15-year bond period for the storm recovery charges is approximately $262 million for Duke Energy Carolinas and $842 million for Duke Energy Progress. The NCUC has until March 10, 2021, to issue financing orders. Duke Energy Carolinas and Duke Energy Progress cannot predict the outcome of this matter. Duke Energy Carolinas 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 North Carolina Public Staff (Public Staff) filed an Agreement and Stipulation of Partial Settlement resolving certain portions of the proceeding. Terms of the settlement included a return on equity 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. On August 8, 2018, the Public Staff filed a Notice of Cross Appeal to the North Carolina Supreme Court. On November 29, 2018, the North Carolina Attorney General's Office filed a motion with the North Carolina Supreme Court requesting the court consolidate the Duke Energy Carolinas and Duke Energy Progress appeals and enter an order adopting the parties’ proposed briefing schedule as set out in the filing. On November 29, 2018, the North Carolina Supreme Court adopted a schedule for briefing set forth in the motion to consolidate the Duke Energy Carolinas and Duke Energy Progress appeals. Appellant briefs were filed on April 26, 2019. The Appellee response briefs were filed on September 25, 2019. Oral arguments before the North Carolina Supreme Court were held on March 11, 2020. Duke Energy Carolinas cannot predict the outcome of this matter. 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. The NCUC established a procedural schedule with an evidentiary hearing to begin on March 23, 2020. On March 16, 2020, in consideration of public health and safety as a result of the COVID-19 pandemic, Duke Energy Carolinas filed a motion with the NCUC seeking a suspension of the procedural schedule in the rate case, including issuing discovery requests, and postponement of the evidentiary hearing for 60 days. Also on March 16, 2020, the NCUC issued an Order Postponing Hearing and Addressing Procedural Matters, which postponed the evidentiary hearing until further order by the commission. On March 25, 2020, Duke Energy Carolinas and the Public Staff filed an Agreement and Stipulation of Partial Settlement, which is subject to review and approval of the NCUC, resolving certain issues in the base rate proceeding. Major components of the settlement included: • Removal of deferred storm costs from the rate case; • Filing a petition seeking to securitize the deferred storm costs within 120 days of a commission order in this rate case regarding the reasonableness and prudency of the storm costs; • Agreement of certain assumptions to demonstrate the quantifiable benefits to customers of a securitization financing; and • Agreement on certain accounting matters, including recovery of employee incentives, severance, aviation costs and executive compensation. On May 6, 2020, Duke Energy Carolinas, Duke Energy Progress and the Public Staff filed a joint motion requesting that the NCUC issue an order scheduling one consolidated evidentiary hearing to consider the companies’ applications for net rate increases. On June 17, 2020, the NCUC issued an order adopting procedures for the expert witness hearings to take place in three phases: (1) a hearing on issues common to both rate cases conducted remotely; (2) a hearing on Duke Energy Carolinas specific rate case issues, followed immediately by; (3) a hearing on Duke Energy Progress specific rate case issues. 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), which is subject to review and approval of the NCUC, resolving certain remaining issues in the base rate proceeding. Major components of the Second Partial Settlement included: • A return on equity of 9.6% and a capital structure of 52% equity and 48% debt; • Agreement on amortization over a five-year period for unprotected federal EDIT flowbacks to customers; • Agreement on the inclusion of plant in service and other revenue requirement updates through May 31, 2020, subject to Public Staff review. Annual revenue requirement associated with the May 31 update is estimated at $45 million ; and • Settlement to allow the deferral of costs for certain grid projects placed in service between June 1, 2020, and December 31, 2022, totaling $0.8 billion . 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 is based on and consistent with the base rate component of the Second Partial Settlement with the Public Staff and excludes the items to be litigated noted above. Duke Energy Carolinas will not begin the amortization or implementation of these items until a final order is issued in the rate case and new base rates are implemented. These items will also be excluded when determining whether a refund of amounts collected through these temporary rates is needed. In addition, Duke Energy Carolinas also seeks authorization to place a temporary decrement EDIT Rider into effect, concurrent with the temporary base rate change. The temporary rate changes are not final rates and remain subject to the NCUC's determination of the just and reasonable rates to be charged by Duke Energy Carolinas on a permanent basis. 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 filed with the NCUC from all parties by November 4, 2020. Duke Energy Carolinas expects the NCUC to issue an order on its net rate increase before the end of the first quarter of 2021. Duke Energy Carolinas cannot predict the outcome of this matter. 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 a return on equity 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, return on equity 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 and the ORS filed a Notice of Cross Appeal with the Supreme Court of South Carolina. On February 12, 2020, Duke Energy Carolinas and the ORS filed a joint motion to extend briefing schedule deadlines, which was approved by the Supreme Court of South Carolina on February 20, 2020. On March 10, 2020, the ORS filed a consent motion requesting withdrawal of their appeal, which was granted by the Supreme Court of South Carolina on April 30, 2020. 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 related to the Lee Nuclear Station. Response briefs were filed on July 6, 2020, and reply briefs were filed on August 11, 2020. Oral arguments have not yet been scheduled by the Supreme Court of South Carolina. Based on legal analysis and the filing of the appeal, Duke Energy Carolinas has not recorded an adjustment for its deferred coal ash costs. Duke Energy Carolinas cannot predict the outcome of this matter. Duke Energy Progress 2017 North Carolina Rate Case On June 1, 2017, Duke Energy Progress filed an application with the NCUC for a rate increase for retail customers of approximately $477 million , which was subsequently adjusted to $420 million . On November 22, 2017, Duke Energy Progress and the Public Staff filed an Agreement and Stipulation of Partial Settlement resolving certain portions of the proceeding. Terms of the settlement included a return on equity of 9.9% and a capital structure of 52% equity and 48% debt. On February 23, 2018, the NCUC issued an order approving the stipulation. The Public Staff, the North Carolina Attorney General and the Sierra Club filed notices of appeal to the North Carolina Supreme Court. On November 29, 2018, the North Carolina Attorney General's Office filed a motion with the North Carolina Supreme Court requesting the court consolidate the Duke Energy Progress and Duke Energy Carolinas appeals and enter an order adopting the parties’ proposed briefing schedule as set out in the filing. Appellant briefs were filed on April 26, 2019. The Appellee response briefs were filed on September 25, 2019. Oral arguments before the North Carolina Supreme Court were held on March 11, 2020. Duke Energy Progress cannot predict the outcome of this matter. 2019 North Carolina Rate Case On October 30, 2019, Duke Energy Progress filed an application with the NCUC for a net rate increase for retail customers of approximately $464 million , which represented an approximate 12.3% increase in annual base revenues. The gross rate case revenue increase request was $586 million , which was offset by riders of $122 million , primarily an EDIT rider of $120 million to return to customers North Carolina and federal EDIT resulting from recent reductions in corporate tax rates. The request for 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 Progress seeks to defer and recover incremental Hurricane Dorian storm costs in this proceeding and requests rates be effective no later than September 1, 2020. As a result of the COVID-19 pandemic, on March 24, 2020, the NCUC suspended the procedural schedule and postponed the previously scheduled evidentiary hearing on this matter indefinitely. On April 7, 2020, the NCUC issued an order partially resuming the procedural schedule requiring intervenors to file direct testimony on April 13, 2020. Public Staff filed supplemental direct testimony on April 23, 2020. Duke Energy Progress filed rebuttal testimony on May 4, 2020. On June 2, 2020, Duke Energy Progress and the Public Staff filed an Agreement and Stipulation of Partial Settlement, which is subject to review and approval of the NCUC, resolving certain issues in the base rate proceeding. Major components of the settlement included: • Removal of deferred storm costs from the rate case; • Filing a petition seeking to securitize the deferred storm costs within 120 days of a commission order in this rate case regarding the reasonableness and prudency of the storm costs; • Agreement of certain assumptions to demonstrate the quantifiable benefits to customers of a securitization financing; • Agreement that the Asheville CC project is complete and in service and agreement on the amount to be included in rate base; and • Agreement on certain accounting matters, including recovery of employee incentives, severance, aviation costs and executive compensation. On May 6, 2020, Duke Energy Progress, Duke Energy Carolinas and the Public Staff filed a joint motion requesting that the NCUC issue an order scheduling one consolidated evidentiary hearing to consider the companies’ applications for net rate increases. On June 17, 2020, the NCUC issued an order adopting procedures for the expert witness hearings to take place in three phases: (1) a hearing on issues common to both rate cases conducted remotely; (2) a hearing on Duke Energy Carolinas specific rate case issues, followed immediately by; (3) a hearing on Duke Energy Progress specific rate case issues. On July 27, 2020, Duke Energy Progress filed a joint motion with Duke Energy Carolinas and the Public Staff notifying the commission that the parties reached a joint partial settlement with the Public Staff. On July 31, 2020, Duke Energy Progress and the Public Staff filed a Second Agreement and Stipulation of Partial Settlement (Second Partial Settlement), which is subject to review and approval of the NCUC, resolving certain remaining issues in the base rate proceeding. Major components of the Second Partial Settlement included: • A return on equity of 9.6% and a capital structure of 52% equity and 48% debt; • Agreement on amortization over a five-year period for unprotected federal EDIT flowbacks to customers; • Agreement on the inclusion of plant in service and other revenue requirement updates through May 31, 2020, subject to Public Staff review. Annual revenue requirement associated with the May 31 update is estimated at $25 million ; and • Settlement to allow the deferral of costs for certain grid projects placed in service between June 1, 2020, and December 31, 2022, of $0.5 billion . The remaining items litigated at hearing included recovery of deferred coal ash compliance costs that are subject to asset retirement obligation accounting and implementation of new depreciation rates. On August 7, 2020, Duke Energy Progress filed a motion for approval of notice required to implement temporary rates , seeking to exercise its statutory right to implement temporary rates subject to refund on or after September 1, 2020. The revenue requirement to be recovered subject to refund through the temporary rates is based on and consistent with the terms of the base rate component of the settlement agreements with the Public Staff and excludes items to be litigated noted above. Duke Energy Progress will not begin the amortization or implementation of these items until a final determination is issued in the rate case and new base rates are implemented. These items will also be excluded when determining whether a refund of amounts collected through these temporary rates is needed. In addition, Duke Energy Progress also seeks authorization to place a temporary decrement EDIT Rider into effect, concurrent with the temporary base rate change. The temporary rate changes are not final rates and remain subject to the NCUC's determination of the just and reasonable rates to be charged by Duke Energy Progress on a permanent basis. The NCUC approved the August 7, 2020 temporary rates motion on August 11, 2020, and temporary rates went into effect on September 1, 2020. The Duke Energy Progress evidentiary hearing concluded on October 6, 2020, and post-hearing filings are due to be filed with the NCUC from all parties by December 4, 2020. Duke Energy Progress expects the NCUC to issue an order on its net rate increase by the end of the first quarter of 2021. Duke Energy Progress cannot predict the outcome of this matter. Hurricane Dorian Hurricane Dorian reached the Carolinas in September 2019 as a Category 2 hurricane making landfall within Duke Energy Progress’ service territory. Total estimated incremental operation and maintenance expenses incurred to repair and restore the system are approximately $168 million with an additional $4 million in capital investments made for restoration efforts. Approximately $145 million and $179 million of the operation and maintenance expenses are deferred in Regulatory assets within Other Noncurrent Assets on the Condensed Consolidated Balance Sheets as of September 30, 2020 , and December 31, 2019, respectively. A request for an accounting order to defer incremental storm costs associated with Hurricane Dorian was included in Duke Energy Progress' October 30, 2019, general rate case filing with the NCUC. Terms of the June 2, 2020, Agreement and Stipulation of Partial Settlement removed incremental storm costs from the general rate case. A petition seeking to securitize these costs, along with costs from Hurricane Florence, Hurricane Michael and Winter Storm Diego, was filed on October 26, 2020, with the NCUC. The NCUC has until March 10, 2021, to issue financing orders. Duke Energy Progress cannot predict the outcome of this matter. On February 7, 2020, a petition was filed with the PSCSC in the 2019 storm deferrals docket requesting deferral of approximately $22 million in operation and maintenance expenses to an existing storm deferral balance previously approved by the PSCSC. The PSCSC voted to approve the request on March 4, 2020, and issued a final order on April 7, 2020. On July 1, 2020, Duke Energy Progress filed a supplemental true up reducing the actual costs to $17 million . 2018 South Carolina Rate Case On November 8, 2018, Duke Energy Progress filed an application with the PSCSC for a rate increase for retail customers of approximately $59 million . After hearings in April 2019, the PSCSC issued an order on May 21, 2019, which included a return on equity of 9.5% and a capital structure of 53% equity and 47% debt. The order also included the following material components: • Approval of recovery of $4 million of coal ash costs over a five-year period with a return at Duke Energy Progress' WACC; • Denial of recovery of $65 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 $17 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 $12 million decrease through the EDIT Tax Savings Rider resulting from the federal tax rate change and deferred revenues since January 2018 related to the change, to be returned in accordance with 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 three-year period for the deferred revenues; and • Approval of a $12 million increase due to the expiration of EDIT related to reductions in the North Carolina state income tax rate from 6.9% to 2.5%. As a result of the order, revised customer rates were effective June 1, 2019. On May 31, 2019, Duke Energy Progress filed a Petition for Rehearing or Reconsideration of that order contending substantial rights of Duke Energy Progress 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 Progress' request to rehear or reconsider the commission's rulings on certain issues presented in the proceeding including coal ash remediation and disposal costs, return on equity and the recovery of a return on deferred operation and maintenance expenses, but allowing additional litigation-related costs. As a result of the Directive allowing litigation-related costs, customer rates were revised effective July 1, 2019. An order detailing the commission's decision in the Directive was issued on October 18, 2019. Duke Energy Progress filed a notice of appeal on November 15, 2019, with the Supreme Court of South Carolina. The ORS filed a Notice of Cross Appeal on November 20, 2019. On February 12, 2020, Duke Energy Progress and the ORS filed a joint motion to extend briefing schedule deadlines, which was approved by the Supreme Court of South Carolina on February 20, 2020. On March 10, 2020, the ORS filed a consent motion requesting withdrawal of their appeal, which was granted by the Supreme Court of South Carolina on April 30, 2020. Initial briefs were filed on April 21, 2020. Response briefs were filed on July 6, 2020, and reply briefs were filed on August 11, 2020. Oral arguments have not yet been scheduled by the Supreme Court of South Carolina. Based on legal analysis and the filing of the appeal, Duke Energy Progress has not recorded an adjustment for its deferred coal ash costs. Duke Energy Progress cannot predict the outcome of this matter. Western Carolinas Modernization Plan Duke Energy Progress retired the 376 -MW Asheville coal-fired plant on January 29, 2020, at which time the net book value, including associated ash basin closure costs, of $214 million was transferred from Generation facilities to be retired, net to Regulatory assets within Current Assets and Other Noncurrent Assets on the Condensed Consolidated Balance Sheets. On December 27, 2019, Asheville Combined Cycle Unit 5 Combustion Turbine and Unit 6 Steam Turbine Generator and the common systems that serve combined cycle units went into commercial operation. Duke Energy Progress placed the Unit 7 Combustion Turbine into commercial operation in simple-cycle mode on January 15, 2020. The Unit 8 Steam Turbine Generator went into commercial operation on April 5, 2020. On June 2, 2020, Duke Energy Progress filed a request with the PSCSC for an accounting order for the deferral of post-in-service costs incurred in connection with the addition of the Asheville combined-cycle generating plant. The petition requested the PSCSC issue an accounting order authorizing Duke Energy Progress to defer post-in-service costs including the Asheville combined-cycle’s depreciation expense, property taxes, incremental O&M and carrying costs at WACC of approximately $8 million annually. On June 17, 2020, the PSCSC voted to approve the petition and issued its final order on July 6, 2020. On October 8, 2018, Duke Energy Progress filed an application

Commitments and Contingencies

Commitments and Contingencies	9 Months Ended
	Sep. 30, 2020
Commitments and Contingencies Disclosure [Abstract]
Commitments And Contingencies	COMMITMENTS AND CONTINGENCIES ENVIRONMENTAL The Duke Energy Registrants are subject to federal, state and local regulations regarding air and water quality, hazardous and solid waste disposal, coal ash and other environmental matters. These regulations can be changed from time to time, imposing new obligations on the Duke Energy Registrants. The following environmental matters impact all Duke Energy Registrants. Remediation Activities In addition to AROs recorded as a result of various environmental regulations, 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 on the Condensed Consolidated Statements of Operations unless regulatory recovery of the costs is deemed probable. The following table contains information regarding reserves for probable and estimable costs related to the various environmental sites. These reserves are recorded in Accounts Payable within Current Liabilities and Other within Other Noncurrent Liabilities on the Condensed Consolidated Balance Sheets. (in millions) September 30, 2020 December 31, 2019 Reserves for Environmental Remediation Duke Energy $ 66 $ 58 Duke Energy Carolinas 16 11 Progress Energy 15 16 Duke Energy Progress 5 4 Duke Energy Florida 8 9 Duke Energy Ohio 22 19 Duke Energy Indiana 5 4 Piedmont 8 8 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 except as presented in the table below. (in millions) Duke Energy $ 56 Duke Energy Carolinas 12 Duke Energy Ohio 38 LITIGATION 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 North Carolina Business Court against various insurance providers. The lawsuit seeks 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 seeks 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 South Carolina. Due to COVID-19, the court has issued a new scheduling order and the trial is now scheduled for January 2022. Fact and expert discovery is scheduled to be completed by mid-November 2020. The parties are required to file all dispositive pre-trial motions by December 4, 2020. Duke Energy Carolinas and Duke Energy Progress cannot predict the outcome of this matter. Duke Energy Carolinas NTE Carolinas II, LLC Litigation In November 2017, Duke Energy Carolinas entered into a standard FERC interconnection agreement with NTE Carolinas II, LLC (NTE), a company that intended 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 and 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, FERC issued a decision, in response to an NTE petition, ruling (i) that it has exclusive jurisdiction to determine whether a transmission provider may terminate a Large Generator Interconnection Agreement (LGIA), (ii) FERC approval is required to terminate a conforming LGIA if objected to by the interconnection customer, and (iii) Duke Energy may not announce the termination of a conforming LGIA unless FERC has approved the termination. On May 27, 2020, NTE filed FERC's May 21, 2020, Order as a notice of supplemental authority with the federal district court where its Motion to Dismiss is pending. On June 1, 2020, Duke Energy Carolinas filed a response to NTE’s notice of supplemental authority noting that FERC declined to address the merits of any breach of contract claim relating to the LGIA and that the federal court then necessarily retains exclusive authority to award damages for NTE’s breach. On August 17, 2020, the court denied both NTE’s and Duke Energy Carolinas’ Motion to Dismiss. The parties are now preparing to commence discovery. 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. As of September 30, 2020 , there were 159 asserted claims for non-malignant cases with cumulative relief sought of up to $41 million , and 68 asserted claims for malignant cases with cumulative relief sought of up to $23 million . Based on Duke Energy Carolinas’ experience, it is expected that the ultimate resolution of most of these claims likely will be less than the amount claimed. Duke Energy Carolinas has recognized asbestos-related reserves of $578 million at September 30, 2020 , and $604 million at December 31, 2019 . These reserves are classified in Other within Other Noncurrent Liabilities and Other within Current Liabilities on the Condensed Consolidated Balance Sheets. These reserves are based upon Duke Energy Carolinas' best estimate for current and future asbestos claims through 2040 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 2040 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. Duke Energy Carolinas’ cumulative payments began to exceed the self-insured retention in 2008. Future payments up to the policy limit will be reimbursed by the third-party insurance carrier. The insurance policy limit for potential future insurance recoveries indemnification and medical cost claim payments is $714 million in excess of the self-insured retention. Receivables for insurance recoveries were $704 million at September 30, 2020 , and $ 742 million at December 31, 2019 . These amounts are classified in Other within Other Noncurrent Assets and Receivables within Current Assets on the Condensed Consolidated Balance Sheets. 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. 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 $203 million for Duke Energy Progress and Duke Energy Florida, respectively. Discovery is ongoing and a trial is expected to occur in 2021. 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. Duke Energy Florida denies liability and is vigorously defending the arbitration claim. The final arbitration hearing is scheduled for December 2020. Duke Energy Florida cannot predict the outcome of this matter. Duke Energy Indiana Coal Ash Basin Closure Plan Appeal On January 27, 2020, Hoosier Environmental Council filed a Petition for Administrative Review with the Indiana Office of Environmental Adjudication (the court) challenging the Indiana Department of Environmental Management’s December 10, 2019, partial approval of Duke Energy Indiana’s ash pond closure plan. On March 11, 2020, Duke Energy Indiana filed a Motion to Dismiss. On May 5, 2020, the court denied the motion. The parties are completing discovery and have until December 22, 2020, to file dispositive motions. If these claims survive dispositive motions, a hearing is scheduled for April 2021. Duke Energy Indiana cannot predict the outcome of this matter. See Note 6 for additional information. 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. The table below presents recorded reserves based on management’s best estimate of probable loss for legal matters, excluding asbestos-related reserves discussed above. Reserves are classified on the Condensed Consolidated Balance Sheets in Other within Other Noncurrent Liabilities and Other within Current Liabilities. The reasonably possible range of loss in excess of recorded reserves is not material, other than as described above. (in millions) September 30, 2020 December 31, 2019 Reserves for Legal Matters Duke Energy $ 60 $ 62 Duke Energy Carolinas 2 2 Progress Energy 52 55 Duke Energy Progress 9 12 Duke Energy Florida 23 22 Piedmont 1 1 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 Condensed Consolidated Balance Sheets and have uncapped maximum potential payments. However, the Duke Energy Registrants do not believe these guarantees will have a material effect on their results of operations, cash flows or financial position. In addition, the Duke Energy Registrants enter into various fixed-price, noncancelable commitments to purchase or sell power or natural gas, take-or-pay arrangements, transportation, or throughput agreements and other contracts that may or may not be recognized on their respective Condensed Consolidated Balance Sheets. Some of these arrangements may be recognized at fair value on their respective Condensed Consolidated Balance Sheets if such contracts meet the definition of a derivative and the NPNS exception does not apply. In most cases, the Duke Energy Registrants’ purchase obligation contracts contain provisions for price adjustments, minimum purchase levels and other financial commitments. 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 based on adoption of the new standard is $15 million for Duke Energy and Duke Energy Carolinas as of September 30, 2020 . Insurance receivables are 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 has recognized $860 million related to the guarantees of its portion of ACP's outstanding debt of which $95 million was previously recognized due the adoption of new guidance for credit losses effective January 1, 2020. This reserve is included within Other current liabilities on the Condensed Consolidated Balance Sheets at September 30, 2020 . See Notes 1, 3 and 12 for more information. The remaining reserve for credit losses for financial guarantees of $4 million at September 30, 2020 , is included within Other noncurrent liabilities on the Duke Energy's Condensed Consolidated Balance Sheets. Management considers financial guarantees for evaluation under this standard based on the anticipated amount outstanding at the time of default. The reserve for credit losses is based on the evaluation of the contingent components of financial guarantees. Management evaluates the risk of default, exposure and length of time remaining in the period for each contract.

Debt and Credit Facilities

Debt and Credit Facilities	9 Months Ended
	Sep. 30, 2020
Debt Disclosure [Abstract]
Debt And Credit Facilities	DEBT AND CREDIT FACILITIES SUMMARY OF SIGNIFICANT DEBT ISSUANCES The following table summarizes significant debt issuances (in millions). Nine Months Ended September 30, 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) Jun 2030 2.450 % $ 500 $ 500 $ — $ — $ — $ — $ — $ — May 2020 (b) Jun 2050 3.350 % 400 — — — — — 400 August 2020 (c) Feb 2022 0.430 % (d) 700 — — 700 — — — — September 2020 (e) Sep 2025 0.900 % 650 650 — — — — — — September 2020 (e) Jun 2030 2.450 % 350 350 — — — — — — First Mortgage Bonds January 2020 (f) Feb 2030 2.450 % 500 — 500 — — — — — January 2020 (f) Aug 2049 3.200 % 400 — 400 — — — — — March 2020 (g) Apr 2050 2.750 % 550 — — — — — 550 — May 2020 (b) Jun 2030 2.125 % 400 — — — — 400 — — June 2020 (b) Jun 2030 1.750 % 500 — — — 500 — — — August 2020 (h) Aug 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 two-year term loan facility expiring in 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. CURRENT MATURITIES OF LONG-TERM DEBT The following table shows the significant components of Current maturities of long-term debt on the Condensed 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 September 30, 2020 Unsecured Debt Progress Energy, Inc January 2021 4.400 % $ 500 Duke Energy (Parent) May 2021 0.765 % (a) 500 Piedmont June 2021 4.240 % 160 Duke Energy (Parent) September 2021 3.550 % 500 Duke Energy (Parent) September 2021 1.800 % 750 Secured Debt Duke Energy Florida April 2021 1.035 % (a) 250 First Mortgage Bonds Duke Energy Carolinas June 2021 3.900 % 500 Duke Energy Florida August 2021 3.100 % 300 Duke Energy Progress September 2021 3.000 % 500 Duke Energy Progress September 2021 8.625 % 100 Other (b) 609 Current maturities of long-term debt $ 4,669 (a) Debt has a floating interest rate. (b) Includes finance lease obligations, amortizing debt and small bullet maturities. AVAILABLE CREDIT FACILITIES Master Credit Facility In March 2020, Duke Energy amended its existing $8 billion Master Credit Facility to extend the termination date to March 2025 . 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. September 30, 2020 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 $ 1,475 $ 1,250 $ 800 $ 625 $ 600 $ 600 Reduction to backstop issuances Commercial paper (b) (2,007 ) (693 ) (300 ) (308 ) (62 ) (106 ) (229 ) (309 ) Outstanding letters of credit (40 ) (34 ) (4 ) (2 ) — — — — Tax-exempt bonds (81 ) — — — — — (81 ) — Available capacity under the Master Credit Facility $ 5,872 $ 1,923 $ 1,171 $ 940 $ 738 $ 519 $ 290 $ 291 (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 on the Condensed Consolidated Balance Sheets. Term Loan Facility In response to market volatility and ongoing liquidity impacts from COVID-19, in March 2020, Duke Energy (Parent) entered into a $1.5 billion , 364-day Term Loan Credit Agreement, borrowing the full $1.5 billion available on March 19, 2020. The term loan contains a provision for increasing the amount available for borrowing by up to $500 million . Duke Energy (Parent) exercised this provision on March 27, 2020, borrowing an additional $188 million . Proceeds were used to reduce outstanding commercial paper and for general corporate purposes. In the third quarter of 2020, Duke Energy (Parent) repaid $844 million of the loan. Refer to Note 1 for additional information on the COVID-19 pandemic. Other Credit Facilities September 30, 2020 (in millions) Facility size Amount drawn Duke Energy (Parent) Three-Year Revolving Credit Facility $ 1,000 $ 500 In August 2020, Duke Energy Progress repaid its $700 million

Asset Retirement Obligations

Asset Retirement Obligations	9 Months Ended
	Sep. 30, 2020
Asset Retirement Obligation [Abstract]
Asset Retirement Obligations	ASSET RETIREMENT OBLIGATIONS The Duke Energy Registrants record AROs when there is a legal obligation to incur retirement costs associated with the retirement of a long-lived asset and the obligation can be reasonably estimated. Actual costs incurred could be materially different from current estimates that form the basis of the recorded AROs. The following table presents the AROs recorded on the Condensed Consolidated Balance Sheets. September 30, 2020 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) $ 6,815 $ 2,658 $ 4,107 $ 3,606 $ 501 $ — $ — $ — Closure of ash impoundments 6,458 3,049 2,172 2,150 22 51 1,186 — Other 381 67 76 44 32 40 28 17 Total ARO $ 13,654 $ 5,774 $ 6,355 $ 5,800 $ 555 $ 91 $ 1,214 $ 17 Less: Current portion 742 267 297 297 — 7 170 — Total noncurrent ARO $ 12,912 $ 5,507 $ 6,058 $ 5,503 $ 555 $ 84 $ 1,044 $ 17 (a) Duke Energy amount includes purchase accounting adjustments related to the merger with Progress Energy. ARO Liability Rollforward The following table presents the change in liability associated with AROs for the Duke Energy Registrants. 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 (a) $ 13,318 $ 5,734 $ 6,471 $ 5,893 $ 578 $ 80 $ 832 $ 17 Accretion expense (b) 408 195 187 171 16 3 22 — Liabilities settled (c) (540 ) (151 ) (333 ) (293 ) (40 ) (1 ) (56 ) — Liabilities incurred in the current year 17 — — — — — — — Revisions in estimates of cash flows (d) 451 (4 ) 30 29 1 9 416 — Balance at September 30, 2020 $ 13,654 $ 5,774 $ 6,355 $ 5,800 $ 555 $ 91 $ 1,214 $ 17 (a) Primarily relates to decommissioning nuclear power facilities, closure of ash impoundments, asbestos removal, closure of landfills at fossil generation facilities, retirement of natural gas mains and removal of renewable energy generation assets. (b) For the nine months ended September 30, 2020 , substantially all accretion expense relates to Duke Energy's regulated operations and has been deferred in accordance with regulatory accounting treatment. (c) Primarily relates to ash impoundment closures. (d) Primarily relates to increases in closure estimates for certain ash impoundments as a result of certain changes in estimates and 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, new closure plan approvals, as well as increased post closure maintenance, landfill and beneficiation costs. See Note 4 for more information on Hoosier Environmental Council's petition. The incremental amount recorded represents 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.

Goodwill

Goodwill	9 Months Ended
	Sep. 30, 2020
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill	GOODWILL Duke Energy The following table presents the goodwill by reportable segment included on Duke Energy's Condensed Consolidated Balance Sheets at September 30, 2020 , and December 31, 2019 . Electric Utilities Gas Utilities Commercial (in millions) and Infrastructure and Infrastructure Renewables Total Goodwill balance $ 17,379 $ 1,924 $ 122 $ 19,425 Accumulated impairment charges — — (122 ) (122 ) Goodwill, 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 Condensed Consolidated Balance Sheets at September 30, 2020 , and December 31, 2019 . 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. 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 the third quarter of 2020.

Related Party Transactions

Related Party Transactions	9 Months Ended
	Sep. 30, 2020
Related Party Transactions [Abstract]
Related Party Transactions	RELATED PARTY TRANSACTIONS The Subsidiary Registrants engage in related party transactions in accordance with applicable state and federal commission regulations. Refer to the Condensed 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 on the Condensed Consolidated Statements of Operations and Comprehensive Income are presented in the following table. Three Months Ended September 30, Nine Months Ended September 30, (in millions) 2020 2019 2020 2019 Duke Energy Carolinas Corporate governance and shared service expenses (a) $ 198 $ 197 $ 528 $ 606 Indemnification coverages (b) 5 5 15 15 Joint Dispatch Agreement (JDA) revenue (c) 6 12 16 52 JDA expense (c) 28 32 72 145 Intercompany natural gas purchases (d) 10 — 26 7 Progress Energy Corporate governance and shared service expenses (a) $ 185 $ 194 $ 520 $ 553 Indemnification coverages (b) 9 8 27 27 JDA revenue (c) 28 32 72 145 JDA expense (c) 6 12 16 52 Intercompany natural gas purchases (d) 18 19 56 57 Duke Energy Progress Corporate governance and shared service expenses (a) $ 113 $ 114 $ 301 $ 328 Indemnification coverages (b) 4 3 13 11 JDA revenue (c) 28 32 72 145 JDA expense (c) 6 12 16 52 Intercompany natural gas purchases (d) 18 19 56 57 Duke Energy Florida Corporate governance and shared service expenses (a) $ 72 $ 80 $ 219 $ 225 Indemnification coverages (b) 5 5 14 16 Duke Energy Ohio Corporate governance and shared service expenses (a) $ 80 $ 90 $ 241 $ 258 Indemnification coverages (b) 1 1 3 3 Duke Energy Indiana Corporate governance and shared service expenses (a) $ 102 $ 109 $ 300 $ 299 Indemnification coverages (b) 2 2 6 5 Piedmont Corporate governance and shared service expenses (a) $ 31 $ 33 $ 102 $ 102 Indemnification coverages (b) 1 1 2 2 Intercompany natural gas sales (d) 28 19 82 64 Natural gas storage and transportation costs (e) 6 6 17 17 (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 Condensed 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 Condensed 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 Condensed 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 Condensed Consolidated Statements of Operations and Comprehensive Income. (e) Piedmont has related party transactions as a customer of its equity method investments in Pine Needle LNG Company, LLC, Hardy Storage Company, LLC and Cardinal Pipeline Company, LLC natural gas storage and transportation facilities. These expenses are included in Cost of natural gas on Piedmont's Condensed 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, such as pipeline lease arrangements, and their proportionate share of certain charged expenses. These transactions of the Subsidiary Registrants are incurred in the ordinary course of business and are eliminated in consolidation. As discussed in Note 12 , 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 September 30, 2020 Intercompany income tax receivable $ — $ — $ — $ — $ — $ — $ 14 Intercompany income tax payable 206 49 104 98 6 56 — December 31, 2019 Intercompany income tax receivable $ — $ 125 $ 28 $ — $ 9 $ 28 $ 13 Intercompany income tax payable 5 — — 2 — — —

Derivatives and Hedging

Derivatives and Hedging	9 Months Ended
	Sep. 30, 2020
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 Condensed Consolidated Balance Sheets. Cash collateral related to derivative instruments executed under master netting arrangements is offset against the collateralized derivatives on the Condensed Consolidated Balance Sheets. The cash impacts of settled derivatives are recorded as operating activities on the Condensed 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 accumulated other comprehensive income (loss) for the three and nine months ended September 30, 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 Condensed Consolidated Statements of Operations and Comprehensive Income. The following table shows notional amounts of outstanding derivatives related to interest rate risk. September 30, 2020 Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Cash flow hedges $ 653 $ — $ — $ — $ — $ — Undesignated contracts 1,177 400 750 750 — 27 Total notional amount (a) $ 1,830 $ 400 $ 750 $ 750 $ — $ 27 December 31, 2019 Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Cash flow hedges $ 993 $ — $ — $ — $ — $ — Undesignated contracts 1,277 450 800 250 550 27 Total notional amount (a) $ 2,270 $ 450 $ 800 $ 250 $ 550 $ 27 (a) Duke Energy includes amounts related to consolidated VIEs of $653 million in cash flow hedges as of September 30, 2020 , and $693 million in cash flow hedges as of December 31, 2019 . 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 three and nine months ended September 30, 2020 , and 2019 , were 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 costs 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. September 30, 2020 Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy Carolinas Energy Progress Ohio Indiana Piedmont Electricity (GWh) (a) 32,314 — — — 4,126 17,072 — Natural gas (millions of dekatherms) 683 143 156 156 — 2 382 December 31, 2019 Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy Carolinas Energy Progress Ohio Indiana Piedmont Electricity (GWh) 15,858 — — — 1,887 13,971 — Natural gas (millions of dekatherms) 704 130 160 160 — 3 411 (a) Duke Energy includes 11,116 GWh that relates to cash flow hedges. LOCATION AND FAIR VALUE OF DERIVATIVE ASSETS AND LIABILITIES RECOGNIZED ON THE CONDENSED 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 Condensed 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 September 30, 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 $ 57 $ 24 $ 18 $ 18 $ — $ 2 $ 8 $ 6 Noncurrent 26 14 12 12 — — — — Total Derivative Assets – Commodity Contracts $ 83 $ 38 $ 30 $ 30 $ — $ 2 $ 8 $ 6 Interest Rate Contracts Not Designated as Hedging Instruments Current $ 3 $ — $ 3 $ 3 $ — $ — $ — $ — Noncurrent — — — — — — — — Total Derivative Assets – Interest Rate Contracts $ 3 $ — $ 3 $ 3 $ — $ — $ — $ — Total Derivative Assets $ 86 $ 38 $ 33 $ 33 $ — $ 2 $ 8 $ 6 Derivative Liabilities September 30, 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 $ 17 $ — $ — $ — $ — $ — $ — — Noncurrent 85 — — — — — — — Not Designated as Hedging Instruments Current $ 26 $ 12 $ — $ — $ — $ 1 $ — $ 13 Noncurrent 129 4 27 11 — — — 98 Total Derivative Liabilities – Commodity Contracts $ 257 $ 16 $ 27 $ 11 $ — $ 1 $ — $ 111 Interest Rate Contracts Designated as Hedging Instruments Current $ 14 $ — $ — $ — $ — $ — $ — $ — Noncurrent 56 — — — — — — — Not Designated as Hedging Instruments Current 27 17 9 9 — 1 — — Noncurrent 5 — — — — 5 — — Total Derivative Liabilities – Interest Rate Contracts $ 102 $ 17 $ 9 $ 9 $ — $ 6 $ — $ — Total Derivative Liabilities $ 359 $ 33 $ 36 $ 20 $ — $ 7 $ — $ 111 Derivative Assets 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 Commodity Contracts Not Designated as Hedging Instruments Current $ 17 $ — $ — $ — $ — $ 3 $ 13 $ 1 Noncurrent 1 — — — — 1 — — Total Derivative Assets – Commodity Contracts $ 18 $ — $ — $ — $ — $ 4 $ 13 $ 1 Interest Rate Contracts Not Designated as Hedging Instruments Current 6 — 6 — 6 — — — Total Derivative Assets – Interest Rate Contracts $ 6 $ — $ 6 $ — $ 6 $ — $ — $ — Equity Securities Contracts Not Designated as Hedging Instruments Current 1 — 1 — 1 — — — Total Derivative Assets – Equity Securities Contracts $ 1 $ — $ 1 $ — $ 1 $ — $ — $ — Total Derivative Assets $ 25 $ — $ 7 $ — $ 7 $ 4 $ 13 $ 1 Derivative Liabilities 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 Commodity Contracts Not Designated as Hedging Instruments Current $ 67 $ 33 $ 26 $ 26 $ — $ — $ 1 $ 7 Noncurrent 156 10 37 22 — — — 110 Total Derivative Liabilities – Commodity Contracts $ 223 $ 43 $ 63 $ 48 $ — $ — $ 1 $ 117 Interest Rate Contracts Designated as Hedging Instruments Current $ 19 $ — $ — $ — $ — $ — $ — $ — Noncurrent 21 — — — — — — — Not Designated as Hedging Instruments Current 8 6 1 1 — 1 — — Noncurrent 5 — — — — 5 — — Total Derivative Liabilities – Interest Rate Contracts $ 53 $ 6 $ 1 $ 1 $ — $ 6 $ — $ — Equity Securities Contracts Not Designated as Hedging Instruments Current 24 — 24 — 24 — — — Total Derivative Liabilities – Equity Securities Contracts $ 24 $ — $ 24 $ — $ 24 $ — $ — $ — Total Derivative Liabilities $ 300 $ 49 $ 88 $ 49 $ 24 $ 6 $ 1 $ 117 OFFSETTING ASSETS AND LIABILITIES The following tables present the line items on the Condensed 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 September 30, 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 $ 60 $ 24 $ 21 $ 21 $ — $ 2 $ 8 $ 6 Gross amounts offset (1 ) — — — — — — — Net amounts presented in Current Assets: Other $ 59 $ 24 $ 21 $ 21 $ — $ 2 $ 8 $ 6 Noncurrent Gross amounts recognized $ 26 $ 14 $ 12 $ 12 $ — $ — $ — $ — Gross amounts offset (8 ) — (8 ) (8 ) — — — — Net amounts presented in Other Noncurrent Assets: Other $ 18 $ 14 $ 4 $ 4 $ — $ — $ — $ — Derivative Liabilities September 30, 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 $ 84 $ 29 $ 9 $ 9 $ — $ 2 $ — $ 13 Gross amounts offset (1 ) — — — — — — — Net amounts presented in Current Liabilities: Other $ 83 $ 29 $ 9 $ 9 $ — $ 2 $ — $ 13 Noncurrent Gross amounts recognized $ 275 $ 4 $ 27 $ 11 $ — $ 5 $ — $ 98 Gross amounts offset (8 ) — (8 ) (8 ) — — — — Net amounts presented in Other Noncurrent Liabilities: Other $ 267 $ 4 $ 19 $ 3 $ — $ 5 $ — $ 98 Derivative Assets 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 Gross amounts recognized $ 24 $ — $ 7 $ — $ 7 $ 3 $ 13 $ 1 Gross amounts offset (1 ) — (1 ) — (1 ) — — — Net amounts presented in Current Assets: Other $ 23 $ — $ 6 $ — $ 6 $ 3 $ 13 $ 1 Noncurrent Gross amounts recognized $ 1 $ — $ — $ — $ — $ 1 $ — $ — Gross amounts offset — — — — — — — — Net amounts presented in Other Noncurrent Assets: Other $ 1 $ — $ — $ — $ — $ 1 $ — $ — Derivative Liabilities 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 Gross amounts recognized $ 118 $ 39 $ 51 $ 27 $ 24 $ 1 $ 1 $ 7 Gross amounts offset (24 ) — (24 ) — (24 ) — — — Net amounts presented in Current Liabilities: Other $ 94 $ 39 $ 27 $ 27 $ — $ 1 $ 1 $ 7 Noncurrent Gross amounts recognized $ 182 $ 10 $ 37 $ 22 $ — $ 5 $ — $ 110 Gross amounts offset — — — — — — — — Net amounts presented in Other Noncurrent Liabilities: Other $ 182 $ 10 $ 37 $ 22 $ — $ 5 $ — $ 110 OBJECTIVE CREDIT CONTINGENT FEATURES Certain derivative contracts contain objective credit contingent features. These features include the requirement to post cash collateral or letters of credit if specific events occur, such as a credit rating downgrade below investment grade. The following tables show information with respect to derivative contracts that are in a net liability position and contain objective credit-risk-related payment provisions. September 30, 2020 Duke Duke Duke Energy Progress Energy (in millions) Energy Carolinas Energy Progress Aggregate fair value of derivatives in a net liability position $ 20 $ 9 $ 11 $ 11 Fair value of collateral already posted — — — — Additional cash collateral or letters of credit in the event credit-risk-related contingent features were triggered 20 9 11 11 December 31, 2019 Duke Duke Duke Energy Progress Energy (in millions) Energy Carolinas Energy Progress Aggregate fair value of derivatives in a net liability position $ 79 $ 35 $ 44 $ 44 Fair value of collateral already posted — — — — Additional cash collateral or letters of credit in the event credit-risk-related contingent features were triggered 79 35 44 44 The Duke Energy Registrants have elected to offset cash collateral and fair values of derivatives. For amounts to be netted, the derivative and cash collateral must be executed with the same counterparty under the same master netting arrangement.

Investments in Debt and Equity

Investments in Debt and Equity Securities	9 Months Ended
	Sep. 30, 2020
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 fair value through net income (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 September 30, 2020 , and December 31, 2019 . Other Investments amounts are recorded in Other within Other Noncurrent Assets on the Condensed 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. September 30, 2020 December 31, 2019 Gross Gross Gross Gross Unrealized Unrealized Estimated Unrealized Unrealized Estimated Holding Holding Fair Holding Holding Fair (in millions) Gains Losses Value Gains Losses Value NDTF Cash and cash equivalents $ — $ — $ 687 $ — $ — $ 101 Equity securities 3,436 103 5,459 3,523 55 5,661 Corporate debt securities 65 1 789 37 1 603 Municipal bonds 19 1 407 13 — 368 U.S. government bonds 58 — 843 33 1 1,256 Other debt securities 9 — 185 3 — 141 Total NDTF Investments $ 3,587 $ 105 $ 8,370 $ 3,609 $ 57 $ 8,130 Other Investments Cash and cash equivalents $ — $ — $ 110 $ — $ — $ 52 Equity securities 60 — 126 57 — 122 Corporate debt securities 8 — 129 3 — 67 Municipal bonds 6 1 114 4 — 94 U.S. government bonds 1 — 21 2 — 41 Other debt securities — — 44 — — 56 Total Other Investments $ 75 $ 1 $ 544 $ 66 $ — $ 432 Total Investments $ 3,662 $ 106 $ 8,914 $ 3,675 $ 57 $ 8,562 Realized gains and losses, which were determined on a specific identification basis, from sales of FV-NI and AFS securities for the three and nine months ended September 30, 2020 , and 2019 , were as follows. Three Months Ended Nine Months Ended (in millions) September 30, 2020 September 30, 2019 September 30, 2020 September 30, 2019 FV-NI: Realized gains $ 13 $ 60 $ 338 $ 161 Realized losses 16 43 148 136 AFS: Realized gains 26 53 73 110 Realized losses 19 36 38 83 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. September 30, 2020 December 31, 2019 Gross Gross Gross Gross Unrealized Unrealized Estimated Unrealized Unrealized Estimated Holding Holding Fair Holding Holding Fair (in millions) Gains Losses Value Gains Losses Value NDTF Cash and cash equivalents $ — $ — $ 42 $ — $ — $ 21 Equity securities 2,027 52 3,229 1,914 8 3,154 Corporate debt securities 42 1 507 21 1 361 Municipal bonds 5 — 118 3 — 96 U.S. government bonds 28 — 428 16 1 578 Other debt securities 7 — 179 3 — 137 Total NDTF Investments $ 2,109 $ 53 $ 4,503 $ 1,957 $ 10 $ 4,347 Realized gains and losses, which were determined on a specific identification basis, from sales of FV-NI and AFS securities for the three and nine months ended September 30, 2020 , and 2019 , were as follows. Three Months Ended Nine Months Ended (in millions) September 30, 2020 September 30, 2019 September 30, 2020 September 30, 2019 FV-NI: Realized gains $ 10 $ 34 $ 46 $ 101 Realized losses 12 26 82 95 AFS: Realized gains 20 21 50 46 Realized losses 17 13 30 34 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. September 30, 2020 December 31, 2019 Gross Gross Gross Gross Unrealized Unrealized Estimated Unrealized Unrealized Estimated Holding Holding Fair Holding Holding Fair (in millions) Gains Losses Value Gains Losses Value NDTF Cash and cash equivalents $ — $ — $ 645 $ — $ — $ 80 Equity securities 1,409 51 2,230 1,609 47 2,507 Corporate debt securities 23 — 282 16 — 242 Municipal bonds 14 1 289 10 — 272 U.S. government bonds 30 — 415 17 — 678 Other debt securities 2 — 6 — — 4 Total NDTF Investments $ 1,478 $ 52 $ 3,867 $ 1,652 $ 47 $ 3,783 Other Investments Cash and cash equivalents $ — $ — $ 107 $ — $ — $ 49 Municipal bonds 4 — 53 3 — 51 Total Other Investments $ 4 $ — $ 160 $ 3 $ — $ 100 Total Investments $ 1,482 $ 52 $ 4,027 $ 1,655 $ 47 $ 3,883 Realized gains and losses, which were determined on a specific identification basis, from sales of FV-NI and AFS securities for the three and nine months ended September 30, 2020 , and 2019 , were as follows. Three Months Ended Nine Months Ended (in millions) September 30, 2020 September 30, 2019 September 30, 2020 September 30, 2019 FV-NI: Realized gains $ 3 $ 26 $ 292 $ 60 Realized losses 4 17 66 41 AFS: Realized gains 6 31 17 62 Realized losses 2 23 7 49 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. September 30, 2020 December 31, 2019 Gross Gross Gross Gross Unrealized Unrealized Estimated Unrealized Unrealized Estimated Holding Holding Fair Holding Holding Fair (in millions) Gains Losses Value Gains Losses Value NDTF Cash and cash equivalents $ — $ — $ 57 $ — $ — $ 53 Equity securities 1,340 51 2,150 1,258 21 2,077 Corporate debt securities 23 — 282 16 — 242 Municipal bonds 14 1 289 10 — 272 U.S. government bonds 30 — 415 16 — 403 Other debt securities 2 — 6 — — 4 Total NDTF Investments $ 1,409 $ 52 $ 3,199 $ 1,300 $ 21 $ 3,051 Other Investments Cash and cash equivalents $ — $ — $ 1 $ — $ — $ 2 Total Other Investments $ — $ — $ 1 $ — $ — $ 2 Total Investments $ 1,409 $ 52 $ 3,200 $ 1,300 $ 21 $ 3,053 Realized gains and losses, which were determined on a specific identification basis, from sales of FV-NI and AFS securities for the three and nine months ended September 30, 2020 , and 2019 , were as follows. Three Months Ended Nine Months Ended (in millions) September 30, 2020 September 30, 2019 September 30, 2020 September 30, 2019 FV-NI: Realized gains $ 3 $ 10 $ 43 $ 27 Realized losses 4 9 51 24 AFS: Realized gains 6 2 17 4 Realized losses 2 — 7 2 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. September 30, 2020 December 31, 2019 Gross Gross Gross Gross Unrealized Unrealized Estimated Unrealized Unrealized Estimated Holding Holding Fair Holding Holding Fair (in millions) Gains Losses Value Gains Losses Value NDTF Cash and cash equivalents $ — $ — $ 588 $ — $ — $ 27 Equity securities 69 — 80 351 26 430 U.S. government bonds — — — 1 — 275 Total NDTF Investments (a) $ 69 $ — $ 668 $ 352 $ 26 $ 732 Other Investments Cash and cash equivalents $ — $ — $ 2 $ — $ — $ 4 Municipal bonds 4 — 53 3 — 51 Total Other Investments $ 4 $ — $ 55 $ 3 $ — $ 55 Total Investments $ 73 $ — $ 723 $ 355 $ 26 $ 787 (a) During the nine months ended September 30, 2020 , Duke Energy Florida continued to receive reimbursements from the NDTF for costs related to ongoing decommissioning activity of 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 three and nine months ended September 30, 2020 , and 2019 , were as follows. Three Months Ended Nine Months Ended (in millions) September 30, 2020 September 30, 2019 September 30, 2020 September 30, 2019 FV-NI: Realized gains $ — $ 16 $ 249 $ 33 Realized losses — 8 15 17 AFS: Realized gains — 29 — 58 Realized losses — 23 — 47 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. September 30, 2020 December 31, 2019 Gross Gross Gross Gross Unrealized Unrealized Estimated Unrealized Unrealized Estimated Holding Holding Fair Holding Holding Fair (in millions) Gains Losses Value Gains Losses Value Investments Cash and cash equivalents $ — $ — $ 1 $ — $ — $ — Equity securities 45 — 84 43 — 81 Corporate debt securities — — 3 — — 6 Municipal bonds 1 1 39 1 — 36 U.S. government bonds — — 3 — — 2 Total Investments $ 46 $ 1 $ 130 $ 44 $ — $ 125 Realized gains and losses, which were determined on a specific identification basis, from sales of FV-NI and AFS securities for the three and nine months ended September 30, 2020 , and 2019 , were immaterial. DEBT SECURITY MATURITIES The table below summarizes the maturity date for debt securities. September 30, 2020 Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Indiana Due in one year or less $ 53 $ 13 $ 15 $ 14 $ 1 $ 4 Due after one through five years 558 247 256 246 10 16 Due after five through 10 years 608 278 232 224 8 9 Due after 10 years 1,313 694 542 508 34 16 Total $ 2,532 $ 1,232 $ 1,045 $ 992 $ 53 $ 45

Fair Value Measurements

Fair Value Measurements	9 Months Ended
	Sep. 30, 2020
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 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 (NAV) per share practical expedient. The NAV 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 New York Stock Exchange 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. 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 12 in Duke Energy's Annual Report on Form 10-K for the year ended December 31, 2019, 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 Condensed Consolidated Balance Sheets. Derivative amounts in the tables below for all Duke Energy Registrants exclude cash collateral, which is disclosed in Note 9 . See Note 10 for additional information related to investments by major security type for the Duke Energy Registrants. September 30, 2020 (in millions) Total Fair Value Level 1 Level 2 Level 3 Not Categorized NDTF cash and cash equivalents $ 687 $ 687 $ — $ — $ — NDTF equity securities 5,459 5,413 — — 46 NDTF debt securities 2,224 363 1,861 — — Other equity securities 126 126 — — — Other debt securities 308 18 290 — — Other cash and cash equivalents 110 110 — — — Derivative assets 86 5 71 10 — Total assets 9,000 6,722 2,222 10 46 Derivative liabilities (359 ) (1 ) (145 ) (213 ) — Net assets (liabilities) $ 8,641 $ 6,721 $ 2,077 $ (203 ) $ 46 December 31, 2019 (in millions) Total Fair Value Level 1 Level 2 Level 3 Not Categorized NDTF cash and cash equivalents $ 101 $ 101 $ — $ — $ — NDTF equity securities 5,684 5,633 — — 51 NDTF debt securities 2,368 725 1,643 — — Other equity securities 122 122 — — — Other debt securities 258 39 219 — — Other cash and cash equivalents 52 52 — — — Derivative assets 25 3 7 15 — Total assets 8,610 6,675 1,869 15 51 NDTF equity security contracts (23 ) — (23 ) — — Derivative liabilities (277 ) (15 ) (145 ) (117 ) — Net assets (liabilities) $ 8,310 $ 6,660 $ 1,701 $ (102 ) $ 51 The following tables provide reconciliations of beginning and ending balances of assets and liabilities measured at fair value using Level 3 measurements. Derivatives (net) Three Months Ended September 30, Nine Months Ended September 30, (in millions) 2020 2019 2020 2019 Balance at beginning of period $ (92 ) $ (79 ) $ (102 ) $ (113 ) Total pretax realized or unrealized gains included in comprehensive income (102 ) — (102 ) — Purchases, sales, issuances and settlements: Purchases — — 14 38 Settlements (3 ) (9 ) (18 ) (32 ) Total (losses) gains included on the Condensed Consolidated Balance Sheet (6 ) (2 ) 5 17 Balance at end of period $ (203 ) $ (90 ) $ (203 ) $ (90 ) DUKE ENERGY CAROLINAS The following tables provide recorded balances for assets and liabilities measured at fair value on a recurring basis on the Condensed Consolidated Balance Sheets. September 30, 2020 (in millions) Total Fair Value Level 1 Level 2 Not Categorized NDTF cash and cash equivalents $ 42 $ 42 $ — $ — NDTF equity securities 3,229 3,183 — 46 NDTF debt securities 1,232 131 1,101 — Derivative assets 38 — 38 — Total assets 4,541 3,356 1,139 46 Derivative liabilities (33 ) — (33 ) — Net assets $ 4,508 $ 3,356 $ 1,106 $ 46 December 31, 2019 (in millions) Total Fair Value Level 1 Level 2 Not Categorized NDTF cash and cash equivalents $ 21 $ 21 $ — $ — NDTF equity securities 3,154 3,103 — 51 NDTF debt securities 1,172 206 966 — Total assets 4,347 3,330 966 51 Derivative liabilities (49 ) — (49 ) — Net assets $ 4,298 $ 3,330 $ 917 $ 51 PROGRESS ENERGY The following tables provide recorded balances for assets and liabilities measured at fair value on a recurring basis on the Condensed Consolidated Balance Sheets. September 30, 2020 December 31, 2019 (in millions) Total Fair Value Level 1 Level 2 Total Fair Value Level 1 Level 2 NDTF cash and cash equivalents $ 645 $ 645 $ — $ 80 $ 80 $ — NDTF equity securities 2,230 2,230 — 2,530 2,530 — NDTF debt securities 992 232 760 1,196 519 677 Other debt securities 53 — 53 51 — 51 Other cash and cash equivalents 107 107 — 49 49 — Derivative assets 33 — 33 7 — 7 Total assets 4,060 3,214 846 3,913 3,178 735 NDTF equity security contracts — — — (23 ) — (23 ) Derivative liabilities (36 ) — (36 ) (65 ) — (65 ) Net assets $ 4,024 $ 3,214 $ 810 $ 3,825 $ 3,178 $ 647 DUKE ENERGY PROGRESS The following tables provide recorded balances for assets and liabilities measured at fair value on a recurring basis on the Condensed Consolidated Balance Sheets. September 30, 2020 December 31, 2019 (in millions) Total Fair Value Level 1 Level 2 Total Fair Value Level 1 Level 2 NTDF cash and cash equivalents $ 57 $ 57 $ — $ 53 $ 53 $ — NDTF equity securities 2,150 2,150 — 2,077 2,077 — NDTF debt securities 992 232 760 921 244 677 Other cash and cash equivalents 1 1 — 2 2 — Derivative assets 33 — 33 — — — Total assets 3,233 2,440 793 3,053 2,376 677 Derivative liabilities (20 ) — (20 ) (49 ) — (49 ) Net assets $ 3,213 $ 2,440 $ 773 $ 3,004 $ 2,376 $ 628 DUKE ENERGY FLORIDA The following tables provide recorded balances for assets and liabilities measured at fair value on a recurring basis on the Condensed Consolidated Balance Sheets. September 30, 2020 December 31, 2019 (in millions) Total Fair Value Level 1 Level 2 Total Fair Value Level 1 Level 2 NDTF cash and cash equivalents $ 588 $ 588 $ — $ 27 $ 27 $ — NDTF equity securities 80 80 — 453 453 — NDTF debt securities — — — 275 275 — Other debt securities 53 — 53 51 — 51 Other cash and cash equivalents 2 2 — 4 4 — Derivative assets — — — 7 — 7 Total assets 723 670 53 817 759 58 NDTF equity security contracts — — — (23 ) — (23 ) Derivative liabilities — — — (1 ) — (1 ) Net assets $ 723 $ 670 $ 53 $ 793 $ 759 $ 34 DUKE ENERGY OHIO The recorded balances for assets and liabilities measured at fair value on a recurring basis on the Condensed Consolidated Balance Sheets were not material at September 30, 2020 , and December 31, 2019 . DUKE ENERGY INDIANA The following tables provide recorded balances for assets and liabilities measured at fair value on a recurring basis on the Condensed Consolidated Balance Sheets. September 30, 2020 December 31, 2019 (in millions) Total Fair Value Level 1 Level 2 Level 3 Total Fair Value Level 1 Level 2 Level 3 Other equity securities $ 84 $ 84 $ — $ — $ 81 $ 81 $ — $ — Other debt securities 45 — 45 — 44 — 44 — Other cash and cash equivalents 1 1 — — — — — — Derivative assets 8 — — 8 13 2 — 11 Total assets $ 138 $ 85 $ 45 $ 8 $ 138 $ 83 $ 44 $ 11 Derivative liabilities — — — — (1 ) (1 ) — — Net assets $ 138 $ 85 $ 45 $ 8 $ 137 $ 82 $ 44 $ 11 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) Three Months Ended September 30, Nine Months Ended September 30, (in millions) 2020 2019 2020 2019 Balance at beginning of period $ 10 $ 28 $ 11 $ 22 Purchases, sales, issuances and settlements: Purchases — — 10 29 Settlements (3 ) (7 ) (13 ) (26 ) Total gains (losses) included on the Condensed Consolidated Balance Sheet 1 (5 ) — (9 ) Balance at end of period $ 8 $ 16 $ 8 $ 16 PIEDMONT The following tables provide recorded balances for assets and liabilities measured at fair value on a recurring basis on the Condensed Consolidated Balance Sheets. September 30, 2020 December 31, 2019 (in millions) Total Fair Value Level 1 Level 3 Total Fair Value Level 1 Level 3 Derivative assets $ 6 $ 6 $ — $ 1 $ 1 $ — Derivative liabilities (111 ) — (111 ) (117 ) — (117 ) Net (liabilities) assets $ (105 ) $ 6 $ (111 ) $ (116 ) $ 1 $ (117 ) 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) Three Months Ended September 30, Nine Months Ended September 30, (in millions) 2020 2019 2020 2019 Balance at beginning of period $ (105 ) $ (114 ) $ (117 ) $ (141 ) Total (losses) gains and settlements (6 ) 3 6 30 Balance at end of period $ (111 ) $ (111 ) $ (111 ) $ (111 ) QUANTITATIVE INFORMATION ABOUT UNOBSERVABLE INPUTS The following tables include quantitative information about the Duke Energy Registrants' derivatives classified as Level 3. September 30, 2020 Weighted Fair Value Average Investment Type (in millions) Valuation Technique Unobservable Input Range Range Duke Energy Electricity contracts $ (102 ) RTO forward pricing Forward electricity curves – price per MWh $ 14.92 - $ 151.18 $ 29.63 Duke Energy Ohio FTRs 2 RTO auction pricing FTR price – per MWh — - 1.90 0.64 Duke Energy Indiana FTRs 8 RTO auction pricing FTR price – per MWh (1.03 ) - 6.10 0.74 Piedmont Natural gas contracts (111 ) Discounted cash flow Forward natural gas curves – price per MMBtu 1.81 - 2.50 2.11 Duke Energy Total Level 3 derivatives $ (203 ) December 31, 2019 Weighted Fair Value Average Investment Type (in millions) Valuation Technique Unobservable Input Range Range Duke Energy Ohio FTRs $ 4 RTO auction pricing FTR price – per MWh $ 0.59 - $ 3.47 $ 2.07 Duke Energy Indiana FTRs 11 RTO auction pricing FTR price – per MWh (0.66 ) - 9.24 1.15 Piedmont Natural gas contracts (117 ) Discounted cash flow Forward natural gas curves – price per MMBtu 1.59 - 2.46 1.91 Duke Energy Total Level 3 derivatives $ (102 ) 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. September 30, 2020 December 31, 2019 (in millions) Book Value Fair Value Book Value Fair Value Duke Energy (a) $ 60,718 $ 69,503 $ 58,126 $ 63,062 Duke Energy Carolinas 12,548 15,165 11,900 13,516 Progress Energy 19,865 23,825 19,634 22,291 Duke Energy Progress 9,358 10,808 9,058 9,934 Duke Energy Florida 7,917 9,684 7,987 9,131 Duke Energy Ohio 3,089 3,619 2,619 2,964 Duke Energy Indiana 4,104 5,140 4,057 4,800 Piedmont 2,780 3,276 2,384 2,642 (a) Book value of long-term debt includes $1.4 billion at September 30, 2020 , and $1.5 billion at December 31, 2019 , of unamortized debt discount and premium, net of purchase accounting adjustments related to the mergers with Progress Energy and Piedmont that are excluded from fair value of long-term debt. At both September 30, 2020 , and December 31, 2019 , 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	9 Months Ended
	Sep. 30, 2020
Variable Interest Entities [Abstract]
Variable Interest Entities	VARIABLE INTEREST ENTITIES 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 nine months ended September 30, 2020 , and the year ended December 31, 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 for DERF and DEPR are reflected on the Condensed Consolidated Balance Sheets as Long-Term Debt. Amounts borrowed under the credit facilities for DEFR are reflected on the Condensed Consolidated Balance Sheets as Current maturities of long-term debt. Due to the COVID-19 pandemic, as described in Note 1, the Duke Energy Registrants suspended customer disconnections for nonpayment. Since taking action to suspend customer disconnections for nonpayment, certain jurisdictions have now returned to normal operations and billing practices. The full impact of COVID-19 and the Duke Energy Registrant’s related response on customers’ ability to pay for service is uncertain. However, the level of past-due receivables at Duke Energy Carolinas, Duke Energy Progress and Duke Energy Florida have increased significantly during the COVID-19 pandemic, and it is reasonably possible eventual write-offs of customer receivables may increase over current estimates. In the second quarter of 2020, DERF, DEPR and DEFR executed amendments to their credit facilities to manage the impact of past-due receivables resulting from the suspension of customer disconnections from COVID-19. In the third quarter of 2020, DERF executed another amendment to lengthen the terms of the amendment executed in the second quarter. See Note 3 for information about COVID-19 filings with state utility commissions. 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 Condensed 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 . Due to the COVID-19 pandemic, as described in Note 1, the Duke Energy Registrants suspended customer disconnections for nonpayment. Since taking action to suspend customer disconnections for nonpayment, certain jurisdictions have now returned to normal operations and billing practices. The full impact of COVID-19 and the Duke Energy Registrant’s related response on customers’ ability to pay for service is uncertain. However, the level of past-due receivables at Duke Energy Ohio and Duke Energy Indiana have increased significantly during the COVID-19 pandemic, and it is reasonably possible eventual write-offs of customer receivables may increase over current estimates. In July of 2020, CRC executed an amendment to its credit facility to manage the impact of past-due receivables resulting from the suspension of customer disconnections from COVID-19. See Note 3 for information about COVID-19 filings with state utility commissions. 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 December 2022 April 2023 April 2021 Credit facility amount $ 350 $ 475 $ 350 $ 250 Amounts borrowed at September 30, 2020 350 475 350 250 Amounts borrowed at December 31, 2019 350 474 325 250 Restricted Receivables at September 30, 2020 479 770 559 506 Restricted Receivables at December 31, 2019 522 642 489 336 Nuclear Asset-Recovery Bonds – 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 Condensed Consolidated Balance Sheets. (in millions) September 30, 2020 December 31, 2019 Receivables of VIEs $ 6 $ 5 Regulatory Assets: Current 53 52 Current Assets: Other 16 39 Other Noncurrent Assets: Regulatory assets 951 989 Current Liabilities: Other 2 10 Current maturities of long-term debt 55 54 Long-Term Debt 1,001 1,057 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 Engineering, Procurement and Construction 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 Condensed Consolidated Balance Sheets related to Commercial Renewables VIEs. (in millions) September 30, 2020 December 31, 2019 Current Assets: Other $ 319 $ 203 Property, Plant and Equipment: Cost 6,239 5,747 Accumulated depreciation and amortization (1,200 ) (1,041 ) Other Noncurrent Assets: Other 79 106 Current maturities of long-term debt 161 162 Long-Term Debt 1,452 1,541 Other Noncurrent Liabilities: AROs 150 127 Other Noncurrent Liabilities: Other 342 228 NON-CONSOLIDATED VIEs The following tables summarize the impact of non-consolidated VIEs on the Condensed Consolidated Balance Sheets. September 30, 2020 Duke Energy Duke Duke Pipeline Commercial Other Energy Energy (in millions) Investments Renewables VIEs Total Ohio Indiana Receivables from affiliated companies $ — $ (1 ) $ — $ (1 ) $ 45 $ 74 Other current assets 413 — — 413 — $ — Investments in equity method unconsolidated affiliates — 487 1 488 — — Deferred tax asset 26 — — 26 — — Total assets $ 439 $ 486 $ 1 $ 926 $ 45 $ 74 Other current liabilities 927 — 3 930 — — Other noncurrent liabilities 19 — 10 29 — — Total liabilities $ 946 $ — $ 13 $ 959 $ — $ — Net (liabilities) assets $ (507 ) $ 486 $ (12 ) $ (33 ) $ 45 $ 74 December 31, 2019 Duke Energy Duke Duke Pipeline Commercial Other Energy Energy (in millions) Investments Renewables VIEs Total Ohio Indiana Receivables from affiliated companies $ — $ (1 ) $ — $ (1 ) $ 64 $ 77 Investments in equity method unconsolidated affiliates 1,179 300 — 1,479 — — Total assets $ 1,179 $ 299 $ — $ 1,478 $ 64 $ 77 Taxes accrued (1 ) — — (1 ) — — Other current liabilities — — 4 4 — — Deferred income taxes 59 — — 59 — — Other noncurrent liabilities — — 11 11 — — Total liabilities $ 58 $ — $ 15 $ 73 $ — $ — Net assets (liabilities) $ 1,121 $ 299 $ (15 ) $ 1,405 $ 64 $ 77 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 the PPA with OVEC, which is discussed below, and future exit costs associated with the cancellation of the ACP pipeline, 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. On July 5, 2020, Duke Energy determined that it would no longer invest in the construction of the ACP pipeline. See Notes 1, 3 and 4 for further information regarding this transaction. For the three and nine months ended September 30, 2020 , the ACP investment is considered a significant subsidiary because its income (loss) exceeds 10% of Duke Energy’s income (loss). The table below presents unaudited summarized financial information for ACP. Three Months Ended September 30, Nine Months Ended September 30, (in millions) 2020 2019 2020 2019 Net (Loss) Income $ (163 ) $ 65 $ (4,505 ) $ 178 The table below presents Duke Energy's ownership interest and investment balances in these joint ventures. VIE Investment Amount (in millions) Ownership September 30, December 31, Entity Name Interest 2020 2019 ACP (a) 47 % $ (927 ) $ 1,179 Constitution (b) 24 % — — Total $ (927 ) $ 1,179 (a) During the quarter ended June 30, 2020, Duke Energy determined that it would no longer continue its investment in ACP as described above. The current liability related to the cancellation of the ACP pipeline project represents Duke Energy's continuing obligation to fund its share of ACP's obligations. See Notes 1, 3 and 4 for more information. (b) During the year ended December 31, 2019, Duke Energy recorded an other-than-temporary impairment related to Constitution. This charge resulted in the full write-down of Duke Energy's investment in Constitution. Commercial Renewables Duke Energy has investments in various renewable energy project entities. Some of these entities are VIEs due to Duke Energy issuing guarantees for debt service and operations and maintenance reserves in support of debt financings. Duke Energy does not consolidate these VIEs because power to direct and control key activities is shared jointly by Duke Energy and other owners. Other In 2019, Duke Energy acquired a majority ownership in a portfolio of distributed fuel cell projects from Bloom Energy Corporation. Duke Energy is not the primary beneficiary of the assets within the portfolio and does not consolidate the assets in the portfolio. 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. On March 31, 2018, FirstEnergy Solutions Corp (FES), a subsidiary of FirstEnergy Corp. and an ICPA counterparty with a power participation ratio of 4.85% , filed for Chapter 11 bankruptcy, which could increase costs allocated to the counterparties. On July 31, 2018, the bankruptcy court rejected the FES ICPA, which means OVEC is an unsecured creditor in the FES bankruptcy proceeding. In addition, certain proposed environmental rulemaking could result in future increased OVEC cost allocations. In July 2020, legislation was proposed to repeal HB 6. Duke Energy cannot predict the outcome in this matter. 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. The following table shows the gross and net receivables sold. Duke Energy Ohio Duke Energy Indiana (in millions) September 30, 2020 December 31, 2019 September 30, 2020 December 31, 2019 Receivables sold $ 226 $ 253 $ 310 $ 307 Less: Retained interests 45 64 74 77 Net receivables sold $ 181 $ 189 $ 236 $ 230 The following table shows sales and cash flows related to receivables sold. Duke Energy Ohio Duke Energy Indiana Three Months Ended Nine Months Ended Three Months Ended Nine Months Ended September 30, September 30, September 30, September 30, (in millions) 2020 2019 2020 2019 2020 2019 2020 2019 Sales Receivables sold $ 462 $ 479 $ 1,428 $ 1,483 $ 717 $ 762 $ 1,947 $ 2,172 Loss recognized on sale 2 4 8 11 3 4 9 13 Cash flows Cash proceeds from receivables sold $ 449 $ 471 $ 1,439 $ 1,516 $ 689 $ 762 $ 1,941 $ 2,200 Collection fees received 1 — 1 1 — — 1 1 Return received on retained interests 1 1 3 5 1 2 4 7 Cash flows from sales of receivables are reflected within Cash Flows From Operating Activities on Duke Energy Ohio’s and Duke Energy Indiana’s Condensed Consolidated Statements of Cash Flows.

Revenue

Revenue	9 Months Ended
	Sep. 30, 2020
Revenue from Contract with Customer [Abstract]
Revenue	REVENUE 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. 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) 2020 2021 2022 2023 2024 Thereafter Total Progress Energy $ 30 $ 92 $ 94 $ 44 $ 45 $ 58 $ 363 Duke Energy Progress 2 8 8 8 8 — 34 Duke Energy Florida 28 84 86 36 37 58 329 Duke Energy Indiana 2 5 — 7 12 36 62 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 revenues 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. 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) 2020 2021 2022 2023 2024 Thereafter Total Piedmont $ 17 $ 65 $ 64 $ 61 $ 58 $ 377 $ 642 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 Renewable Energy Certificates (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. Other The remainder of Duke Energy’s operations is presented as Other, which does not include material revenues from contracts with customers. Disaggregated Revenues Disaggregated revenues are presented as follows: Three Months Ended September 30, 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 $ 2,936 $ 883 $ 1,550 $ 616 $ 934 $ 213 $ 289 $ — General 1,804 664 805 384 421 119 212 — Industrial 797 342 245 179 66 35 175 — Wholesale 603 117 412 358 54 10 64 — Other revenues 238 62 167 75 92 23 22 — Total Electric Utilities and Infrastructure revenue from contracts with customers $ 6,378 $ 2,068 $ 3,179 $ 1,612 $ 1,567 $ 400 $ 762 $ — Gas Utilities and Infrastructure Residential $ 112 $ — $ — $ — $ — $ 55 $ — $ 57 Commercial 64 — — — — 20 — 44 Industrial 24 — — — — 3 — 22 Power Generation — — — — — — — 10 Other revenues 16 — — — — 3 — 11 Total Gas Utilities and Infrastructure revenue from contracts with customers $ 216 $ — $ — $ — $ — $ 81 $ — $ 144 Commercial Renewables Revenue from contracts with customers $ 57 $ — $ — $ — $ — $ — $ — $ — Other Revenue from contracts with customers $ 7 $ — $ — $ — $ — $ — $ — $ — Total revenue from contracts with customers $ 6,658 $ 2,068 $ 3,179 $ 1,612 $ 1,567 $ 481 $ 762 $ 144 Other revenue sources (a) $ 63 $ (10 ) $ 18 $ 14 $ — $ (8 ) $ (1 ) $ 18 Total revenues $ 6,721 $ 2,058 $ 3,197 $ 1,626 $ 1,567 $ 473 $ 761 $ 162 (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. Three Months Ended September 30, 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 $ 2,923 $ 892 $ 1,522 $ 625 $ 897 $ 215 $ 294 $ — General 1,885 687 843 399 444 127 225 — Industrial 869 372 255 189 66 40 204 — Wholesale 617 113 429 368 61 13 63 — Other revenues 198 76 118 70 48 18 22 — Total Electric Utilities and Infrastructure revenue from contracts with customers $ 6,492 $ 2,140 $ 3,167 $ 1,651 $ 1,516 $ 413 $ 808 $ — Gas Utilities and Infrastructure Residential $ 113 $ — $ — $ — $ — $ 53 $ — $ 59 Commercial 68 — — — — 21 — 47 Industrial 26 — — — — 4 — 25 Power Generation — — — — — — — 13 Other revenues 16 — — — — 3 — 13 Total Gas Utilities and Infrastructure revenue from contracts with customers $ 223 $ — $ — $ — $ — $ 81 $ — $ 157 Commercial Renewables Revenue from contracts with customers $ 69 $ — $ — $ — $ — $ — $ — $ — Other Revenue from contracts with customers $ 8 $ — $ — $ — $ — $ — $ — $ — Total revenue from contracts with customers $ 6,792 $ 2,140 $ 3,167 $ 1,651 $ 1,516 $ 494 $ 808 $ 157 Other revenue sources (a) $ 148 $ 22 $ 75 $ 37 $ 32 $ (5 ) $ (1 ) $ 11 Total revenues $ 6,940 $ 2,162 $ 3,242 $ 1,688 $ 1,548 $ 489 $ 807 $ 168 (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. Nine Months Ended September 30, 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 $ 7,451 $ 2,316 $ 3,792 $ 1,578 $ 2,214 $ 558 $ 785 $ — General 4,691 1,720 2,080 1,001 1,079 336 554 — Industrial 2,148 871 673 487 186 103 502 — Wholesale 1,535 332 1,018 877 141 22 163 — Other revenues 713 184 476 208 268 62 63 — Total Electric Utilities and Infrastructure revenue from contracts with customers $ 16,538 $ 5,423 $ 8,039 $ 4,151 $ 3,888 $ 1,081 $ 2,067 $ — Gas Utilities and Infrastructure Residential $ 631 $ — $ — $ — $ — $ 214 $ — $ 417 Commercial 308 — — — — 86 — 222 Industrial 92 — — — — 12 — 80 Power Generation — — — — — — — 27 Other revenues 58 — — — — 12 — 46 Total Gas Utilities and Infrastructure revenue from contracts with customers $ 1,089 $ — $ — $ — $ — $ 324 $ — $ 792 Commercial Renewables Revenue from contracts with customers $ 170 $ — $ — $ — $ — $ — $ — $ — Other Revenue from contracts with customers $ 20 $ — $ — $ — $ — $ — $ — $ — Total Revenue from contracts with customers $ 17,817 $ 5,423 $ 8,039 $ 4,151 $ 3,888 $ 1,405 $ 2,067 $ 792 Other revenue sources (a) $ 274 $ (7 ) $ 78 $ 56 $ 9 $ (11 ) $ 3 $ 79 Total revenues $ 18,091 $ 5,416 $ 8,117 $ 4,207 $ 3,897 $ 1,394 $ 2,070 $ 871 (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. Nine Months Ended September 30, 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 $ 7,597 $ 2,331 $ 3,879 $ 1,657 $ 2,222 $ 563 $ 825 $ — General 4,896 1,714 2,225 1,044 1,181 335 619 — Industrial 2,339 927 708 514 194 109 595 — Wholesale 1,685 341 1,133 992 141 36 176 — Other revenues 557 222 389 239 150 59 66 — Total Electric Utilities and Infrastructure revenue from contracts with customers $ 17,074 $ 5,535 $ 8,334 $ 4,446 $ 3,888 $ 1,102 $ 2,281 $ — Gas Utilities and Infrastructure Residential $ 673 $ — $ — $ — $ — $ 229 $ — $ 443 Commercial 359 — — — — 96 — 263 Industrial 103 — — — — 14 — 91 Power Generation — — — — — — — 39 Other revenues 101 — — — — 13 — 88 Total Gas Utilities and Infrastructure revenue from contracts with customers $ 1,236 $ — $ — $ — $ — $ 352 $ — $ 924 Commercial Renewables Revenue from contracts with customers $ 157 $ — $ — $ — $ — $ — $ — $ — Other Revenue from contracts with customers $ 18 $ — $ — $ — $ — $ — $ — $ — Total Revenue from contracts with customers $ 18,485 $ 5,535 $ 8,334 $ 4,446 $ 3,888 $ 1,454 $ 2,281 $ 924 Other revenue sources (a) $ 491 $ 84 $ 224 $ 113 $ 99 $ (1 ) $ 8 $ 32 Total revenues $ 18,976 $ 5,619 $ 8,558 $ 4,559 $ 3,987 $ 1,453 $ 2,289 $ 956 (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. Three Months Ended September 30, 2020 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Balance at June 30, 2020 $ 102 $ 14 $ 29 $ 14 $ 14 $ 5 $ 3 $ 6 Write-Offs 12 (2 ) 15 13 2 — — — Credit Loss Expense (9 ) — (16 ) (15 ) — — — 3 Other Adjustments 28 10 9 9 — — — — Balance at September 30, 2020 $ 133 $ 22 $ 37 $ 21 $ 16 $ 5 $ 3 $ 9 Nine Months Ended September 30, 2020 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 (7 ) (8 ) 8 8 — — — (5 ) Credit Loss Expense 24 9 2 (5 ) 8 1 — 7 Other Adjustments 35 10 9 9 — — — — Balance at September 30, 2020 $ 133 $ 22 $ 37 $ 21 $ 16 $ 5 $ 3 $ 9 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, including the impacts of COVID-19, 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. Due to the COVID-19 pandemic, as described in Note 1 , certain jurisdictions have resumed standard billing and credit practices, disconnections for nonpayment and late payment charges, all of which were previously suspended in the first quarter of 2020. The specific actions taken by each Duke Energy Registrant are described in Note 3 . The impact of COVID-19 and Duke Energy’s related response on customers’ ability to pay for service is uncertain, and it is reasonably possible eventual write-offs of customer receivables may increase over current estimates. The aging of trade receivables is presented in the table below. Duke Energy considers receivables greater than 30 days outstanding past due. September 30, 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 $ 788 $ 284 $ 274 $ 139 $ 135 $ 1 $ 16 $ 5 0-30 days 1,800 475 847 439 406 44 23 66 30-60 days 227 86 84 48 36 7 2 8 60-90 days 94 39 31 20 11 3 1 3 90+ days 263 85 68 37 31 40 9 20 Trade and Other Receivables $ 3,172 $ 969 $ 1,304 $ 683 $ 619 $ 95 $ 51 $ 102 UNBILLED REVENUE Unbilled revenues are recognized by applying customer billing rates to the estimated volumes of energy or natural gas delivered but not yet billed. Unbilled revenues can vary significantly from period to period as a result of seasonality, weather, customer usage patterns, customer mix, average price in effect for customer classes, timing of rendering customer bills and meter reading schedules and the impact of weather normalization or margin decoupling mechanisms. Unbilled revenues are included within Receivables and Receivables of VIEs on the Condensed Consolidated Balance Sheets as shown in the following table. (in millions) September 30, 2020 December 31, 2019 Duke Energy $ 788 $ 843 Duke Energy Carolinas 284 298 Progress Energy 274 217 Duke Energy Progress 139 122 Duke Energy Florida 135 95 Duke Energy Ohio 1 1 Duke Energy Indiana 16 16 Piedmont 5 78 Additionally, 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 Condensed Consolidated Balance Sheets of Duke Energy Ohio and Duke Energy Indiana. See Note 12 for further information. These receivables for unbilled revenues are shown in the table below. (in millions) September 30, 2020 December 31, 2019 Duke Energy Ohio $ 66 $ 82 Duke Energy Indiana 106 115

Stockholders' Equity

Stockholders' Equity	9 Months Ended
	Sep. 30, 2020
Equity [Abstract]
Stockholders' Equity	STOCKHOLDERS' EQUITY 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 stock options and equity forward sale agreements, were exercised or settled. Duke Energy’s participating securities are restricted stock units that are entitled to dividends declared on Duke Energy common stock during the restricted stock unit’s vesting periods. Dividends declared on preferred stock are recorded on the Condensed 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. Three Months Ended September 30, Nine Months Ended September 30, (in millions, except per share amounts) 2020 2019 2020 2019 Net income available to Duke Energy common stockholders $ 1,265 $ 1,327 $ 1,347 $ 3,047 Accumulated preferred stock dividends adjustment 12 (2 ) 13 (2 ) Less: Impact of participating securities 1 1 2 4 Income from continuing operations available to Duke Energy common stockholders $ 1,276 $ 1,324 $ 1,358 $ 3,041 Weighted average common shares outstanding – basic 735 729 735 728 Equity forwards — — — — Weighted average common shares outstanding – diluted 735 729 735 728 EPS available to Duke Energy common stockholders Basic and diluted $ 1.74 $ 1.82 $ 1.85 $ 4.18 Potentially dilutive items excluded from the calculation (a) 2 2 2 2 Dividends declared per common share $ 0.965 $ 0.945 $ 2.855 $ 2.800 Dividends declared on Series A preferred stock per depositary share (b) $ 0.359 $ 0.359 $ 1.078 $ 0.667 Dividends declared on Series B preferred stock per share (c) $ 24.375 $ — $ 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. (b) 5.75% Series A Cumulative Redeemable Perpetual Preferred Stock dividends are payable quarterly in arrears on the 16th day of March, June, September and December. The preferred stock has a $25 liquidation preference per depositary share. (c) 4.875% Series B Fixed-Rate Reset Cumulative Redeemable Perpetual Preferred Stock dividends are payable semiannually in arrears on the 16th day of March and September. The preferred stock has a $1,000 liquidation preference per share. 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 an 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. 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. 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 an equity forward sales agreement with an initial forward price of $85.99 per share. The equity forward sales agreements require Duke Energy to either physically settle the transaction by issuing shares in exchange for net proceeds at the then-applicable forward sale price specified by the agreement, or net settle in whole or in part through the delivery or receipt of cash or shares. The initial forward sale price will be subject to adjustment based on a floating interest rate factor and other fixed amounts specified in the relevant forward sale agreements. The settlement alternatives are at Duke Energy's election and settlement of the forward sales agreements are expected to occur on or prior to December 31, 2020. If Duke Energy had elected to net share settle these contracts as of September 30, 2020, Duke Energy would have been required to deliver 1.9 million shares. No amounts have or will be recorded in Duke Energy's Condensed Consolidated Financial Statements with respect to these ATM offerings until settlements of the equity forwards occur. Until settlement of the equity forwards, EPS dilution resulting from the agreements, if any, will be determined under the treasury stock method.

Employee Benefit Plans

Employee Benefit Plans	9 Months Ended
	Sep. 30, 2020
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 and non-qualified, non-contributory defined benefit retirement plans. 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. QUALIFIED PENSION PLANS The following tables include the components of net periodic pension costs for qualified pension plans. Three Months Ended September 30, 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 $ 41 $ 12 $ 12 $ 6 $ 5 $ 1 $ 2 $ 1 Interest cost on projected benefit obligation 67 16 21 10 12 4 6 2 Expected return on plan assets (143 ) (36 ) (48 ) (22 ) (25 ) (7 ) (11 ) (5 ) Amortization of actuarial loss 32 7 10 4 6 2 3 2 Amortization of prior service credit (8 ) (2 ) — — — — — (2 ) Amortization of settlement charges 11 6 5 5 1 — 1 1 Net periodic pension costs $ — $ 3 $ — $ 3 $ (1 ) $ — $ 1 $ (1 ) Three Months Ended September 30, 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 $ 42 $ 13 $ 13 $ 7 $ 5 $ 1 $ 2 $ 1 Interest cost on projected benefit obligation 77 17 24 10 14 5 6 2 Expected return on plan assets (140 ) (36 ) (45 ) (22 ) (22 ) (7 ) (11 ) (5 ) Amortization of actuarial loss 28 6 10 4 6 2 3 2 Amortization of prior service credit (8 ) (2 ) (1 ) — — — — (2 ) Net periodic pension costs $ (1 ) $ (2 ) $ 1 $ (1 ) $ 3 $ 1 $ — $ (2 ) Nine Months Ended September 30, 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 $ 124 $ 38 $ 36 $ 20 $ 16 $ 3 $ 6 $ 4 Interest cost on projected benefit obligation 202 47 64 29 35 12 17 7 Expected return on plan assets (429 ) (108 ) (143 ) (66 ) (76 ) (21 ) (32 ) (16 ) Amortization of actuarial loss 96 21 30 13 17 5 9 7 Amortization of prior service credit (24 ) (6 ) (2 ) (1 ) (1 ) — (1 ) (7 ) Amortization of settlement charges 16 8 6 6 1 — 1 1 Net periodic pension costs $ (15 ) $ — $ (9 ) $ 1 $ (8 ) $ (1 ) $ — $ (4 ) Nine Months Ended September 30, 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 $ 116 $ 37 $ 34 $ 19 $ 15 $ 3 $ 6 $ 4 Interest cost on projected benefit obligation 242 58 76 34 41 14 19 8 Expected return on plan assets (426 ) (111 ) (134 ) (66 ) (66 ) (21 ) (32 ) (16 ) Amortization of actuarial loss 77 17 28 10 18 3 6 5 Amortization of prior service credit (24 ) (6 ) (2 ) (1 ) (1 ) — (1 ) (7 ) Net periodic pension costs $ (15 ) $ (5 ) $ 2 $ (4 ) $ 7 $ (1 ) $ (2 ) $ (6 ) NON-QUALIFIED PENSION PLANS Net periodic pension costs for non-qualified pension plans were not material for the three and nine months ended September 30, 2020, and 2019. OTHER POST-RETIREMENT BENEFIT PLANS Net periodic costs for OPEB plans were not material for the three and nine months ended September 30, 2020, and 2019.

Income Taxes

Income Taxes	9 Months Ended
	Sep. 30, 2020
Income Tax Disclosure [Abstract]
Income Taxes	INCOME TAXES EFFECTIVE TAX RATES The ETRs from continuing operations for each of the Duke Energy Registrants are included in the following table. Three Months Ended Nine Months Ended September 30, September 30, 2020 2019 2020 2019 Duke Energy 7.8 % 12.4 % (6.4 )% 12.5 % Duke Energy Carolinas 12.0 % 16.7 % 13.6 % 17.7 % Progress Energy 10.4 % 15.3 % 13.4 % 16.2 % Duke Energy Progress 3.1 % 14.7 % 10.0 % 16.1 % Duke Energy Florida 21.4 % 16.5 % 20.3 % 18.0 % Duke Energy Ohio 16.7 % 12.9 % 16.6 % 15.2 % Duke Energy Indiana 19.6 % 23.2 % 19.4 % 23.7 % Piedmont 16.7 % 35.7 % 3.7 % 18.5 % The decrease in the ETR for Duke Energy for the three months ended September 30, 2020, was primarily due to an increase in the amortization of excess deferred taxes. The decrease in the ETR for Duke Energy for the nine months ended September 30, 2020 , was primarily due to the impact of the cancellation of the ACP pipeline project recorded in the second quarter of 2020 and an increase in the amortization of excess deferred taxes. The decrease in the ETR for Duke Energy Carolinas for the three and nine months ended September 30, 2020 , was primarily due to an increase in the amortization of excess deferred taxes. The decrease in the ETR for Progress Energy for the three and nine months ended September 30, 2020 , was primarily due to an increase in the amortization of excess deferred taxes. The decrease in the ETR for Duke Energy Progress for the three and nine months ended September 30, 2020 , was primarily due to an increase in the amortization of excess deferred taxes. The increase in the ETR for Duke Energy Florida for the three and nine months ended September 30, 2020, was primarily due to favorable tax adjustments in the prior year. The increase in the ETR for Duke Energy Ohio for the three and nine months ended September 30, 2020, was primarily due to favorable tax adjustments in the prior year. The decrease in the ETR for Duke Energy Indiana for the three and nine months ended September 30, 2020 , was primarily due to an increase in the amortization of excess deferred taxes. The decrease in the ETR for Piedmont for the three months ended September 30, 2020 , was primarily due to a decrease in the amortization of excess deferred taxes, in relation to pretax losses. The decrease in the ETR for Piedmont for the nine months ended September 30, 2020 , was primarily due to an increase in the amortization of excess deferred taxes and an increase in AFUDC equity. OTHER TAX MATTERS 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. As a result, the remaining AMT credit carryforwards were reclassified in the first quarter 2020 to a current receivable included in Other within Current Assets on the Condensed Consolidated Balance Sheets. In the third quarter of 2020, Duke Energy received $572 million related to these AMT credit carryforwards and $19 million of interest income. The other provisions within the CARES Act do not materially impact Duke Energy's income tax accounting. See Note 1 for information on COVID-19.

Subsequent Events

Subsequent Events	9 Months Ended
	Sep. 30, 2020
Subsequent Events [Abstract]
Subsequent Events	SUBSEQUENT EVENTS For information on subsequent events related to regulatory matters, see Note 3. On October 29, 2020, Tropical Storm Zeta impacted Duke Energy Carolinas territory causing nearly 1 million customer power outages. The estimated cost of this storm has not been determined, but is expected to be less than $100 million .

Organization and Basis of Pre_2

Organization and Basis of Presentation (Policy)	9 Months Ended
	Sep. 30, 2020
Policy Text Block [Line Items]
Basis of Presentation	BASIS OF PRESENTATION These Condensed Consolidated Financial Statements have been prepared in accordance with GAAP for interim financial information and with the instructions to Form 10-Q and Regulation S-X. Accordingly, these Condensed Consolidated Financial Statements do not include all information and notes required by GAAP for annual financial statements and should be read in conjunction with the Consolidated Financial Statements in the Duke Energy Registrants’ combined Annual Report on Form 10-K for the year ended December 31, 2019 . The information in these combined notes relates to each of the Duke Energy Registrants as noted in the Index to Combined Notes to Condensed Consolidated Financial Statements. However, none of the registrants make any representations as to information related solely to Duke Energy or the subsidiaries of Duke Energy other than itself. These Condensed Consolidated Financial Statements, in the opinion of the respective companies’ management, reflect all normal recurring adjustments necessary to fairly present the financial position and results of operations of each of the Duke Energy Registrants. Amounts reported in Duke Energy’s interim Condensed Consolidated Statements of Operations and each of the Subsidiary Registrants’ interim Condensed Consolidated Statements of Operations and Comprehensive Income are not necessarily indicative of amounts expected for the respective annual periods due to effects of seasonal temperature variations on energy consumption, regulatory rulings, timing of maintenance on electric generating units, changes in mark-to-market valuations, changing commodity prices and other factors. In preparing financial statements that conform to GAAP, management 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.
Basis of Consolidation and Noncontrolling Interest	BASIS OF CONSOLIDATION These Condensed 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 12 for additional information on VIEs. These Condensed Consolidated Financial Statements also reflect the Duke Energy Registrants’ proportionate share of certain jointly owned generation and transmission facilities. COVID-19 The COVID-19 pandemic is having a significant impact on global health and economic environments. In March 2020, the World Health Organization declared COVID-19 a global pandemic, and President Trump proclaimed that the COVID-19 outbreak in the United States constitutes a national emergency. The Duke Energy Registrants are monitoring developments closely and responding appropriately. The company incurred approximately $39 million and $91 million of incremental COVID-19 costs before deferral for the three and nine months ended September 30, 2020 , respectively, included in Operation, maintenance and other on the Condensed Consolidated Statements of Operations. For the nine months ended September 30, 2020 , the company has deferred approximately $56 million of these incremental costs, which were primarily bad debt expense, personal protective equipment and cleaning supplies. Further, the company waived approximately $29 million and $54 million of late payment fees for the three and nine months ended September 30, 2020 , respectively. See Notes 3 , 5 , 12 , 13 and 16 for additional information as well as steps taken to mitigate the impacts to our business and customers from the COVID-19 pandemic. OTHER CURRENT ASSETS Included in Other within Current Assets on the Piedmont Condensed Consolidated Balance Sheets are prepaid assets of $23 million and $3 million as of September 30, 2020 , and December 31, 2019 , respectively. The prepaid assets relate to natural gas storage injections and inventory transfers classified as prepaid assets until winter season when the natural gas is moved to Inventory on the Piedmont Condensed Consolidated Balance Sheets under certain agreements. OTHER CURRENT LIABILITIES Included in Other within Current Liabilities on the Duke Energy Condensed Consolidated Balance Sheet is a current liability of $935 million and $0 as of September 30, 2020 , and December 31, 2019 , respectively. The current liability, initially recorded in the second quarter and increased during the third quarter, primarily represents Duke Energy's share of ACP's obligations of outstanding debt and to satisfy ARO requirements to restore construction sites. See Notes 3 , 4 and 12 for further information. 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 Condensed Consolidated Balance Sheet. Several operating agreements of Duke Energy's subsidiaries with noncontrolling interest are subject to allocations of earnings, 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 Hypothetical Liquidation at Book Value (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 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 . The following table presents cash received for the sale of noncontrolling interest and allocated losses to noncontrolling interest for the three and nine months ended September 30, 2020 , and 2019 . Three Months Ended September 30, Nine Months Ended September 30, (in millions) 2020 2019 2020 2019 Noncontrolling Interest Capital Contributions Cash received for the sale of noncontrolling interest to tax equity members $ 239 $ 7 $ 402 $ 200 Cash received for the sale of noncontrolling interest to pro rata share members — — — 415 Total Noncontrolling Interest Capital Contributions 239 7 402 615 Noncontrolling Interest Allocation of Income Allocated losses to noncontrolling tax equity members utilizing the HLBV method 59 15 187 105 Allocated losses to noncontrolling members based on pro rata shares of ownership 11 4 21 5 Total Noncontrolling Interest Allocated Losses $ 70 $ 19 $ 208 $ 110
Cash, Cash Equivalents, and Restricted Cash	CASH, CASH EQUIVALENTS AND RESTRICTED CASH Duke Energy, Progress Energy and Duke Energy Florida have restricted cash balances related primarily to collateral assets, escrow deposits and VIEs. See Notes 10 and 12
New Accounting Standards	NEW ACCOUNTING STANDARDS The following new accounting standard was adopted by the Duke Energy Registrants in 2020 . Current Expected Credit Losses. In June 2016, the Financial Accounting Standards Board (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. Duke Energy reviews the credit quality of its counterparties as part of its regular risk management process and requires credit enhancements, such as deposits or letters of credit, as appropriate and as allowed by regulators. Duke Energy recorded cumulative effects of changes in accounting principles related to the adoption of new credit loss standard, for allowances for credit losses of trade and other receivables, insurance receivables and financial guarantees. These amounts are included in the Condensed Consolidated Balance Sheets in Receivables, Receivables of VIEs, Other Noncurrent Assets and Other Noncurrent Liabilities. See Notes 4 and 13 for more information. 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 The following new accounting standard has been issued but not yet adopted by the Duke Energy Registrants as of September 30, 2020 . 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 by the end of 2021. 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 2021 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 2021. 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.
Environmental Costs	Costs are typically expensed as Operation, maintenance and other on the Condensed Consolidated Statements of Operations unless regulatory recovery of the costs is deemed probable.Liabilities are recorded when losses become probable and are reasonably estimable.
Derivatives	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 three and nine months ended September 30, 2020 , and 2019 , were 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 costs volatility for customers. 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 Condensed Consolidated Statements of Operations and Comprehensive Income.
Investments	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.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.
Revenue from Contract with Customer	Additionally, 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 Condensed Consolidated Balance Sheets of Duke Energy Ohio and Duke Energy Indiana. UNBILLED REVENUE Unbilled revenues are recognized by applying customer billing rates to the estimated volumes of energy or natural gas delivered but not yet billed. Unbilled revenues can vary significantly from period to period as a result of seasonality, weather, customer usage patterns, customer mix, average price in effect for customer classes, timing of rendering customer bills and meter reading schedules and the impact of weather normalization or margin decoupling mechanisms.
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 stock options and equity forward sale agreements, were exercised or settled. Duke Energy’s participating securities are restricted stock units that are entitled to dividends declared on Duke Energy common stock during the restricted stock unit’s vesting periods. Dividends declared on preferred stock are recorded on the Condensed 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.

Organization and Basis of Pre_3

Organization and Basis of Presentation (Tables)	9 Months Ended
	Sep. 30, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Schedule of Cash Received and Allocated Losses from Subsidiaries, Noncontrolling Interest	The following table presents cash received for the sale of noncontrolling interest and allocated losses to noncontrolling interest for the three and nine months ended September 30, 2020 , and 2019 . Three Months Ended September 30, Nine Months Ended September 30, (in millions) 2020 2019 2020 2019 Noncontrolling Interest Capital Contributions Cash received for the sale of noncontrolling interest to tax equity members $ 239 $ 7 $ 402 $ 200 Cash received for the sale of noncontrolling interest to pro rata share members — — — 415 Total Noncontrolling Interest Capital Contributions 239 7 402 615 Noncontrolling Interest Allocation of Income Allocated losses to noncontrolling tax equity members utilizing the HLBV method 59 15 187 105 Allocated losses to noncontrolling members based on pro rata shares of ownership 11 4 21 5 Total Noncontrolling Interest Allocated Losses $ 70 $ 19 $ 208 $ 110
Schedule of Cash, Cash Equivalents and Restricted Cash	The following table presents the components of cash, cash equivalents and restricted cash included in the Condensed Consolidated Balance Sheets. September 30, 2020 December 31, 2019 Duke Duke Duke Progress Energy Duke Progress Energy Energy Energy Florida Energy Energy Florida Current Assets Cash and cash equivalents $ 308 $ 70 $ 19 $ 311 $ 48 $ 17 Other 187 16 16 222 39 39 Other Noncurrent Assets Other 105 102 — 40 39 — Total cash, cash equivalents and restricted cash $ 600 $ 188 $ 35 $ 573 $ 126 $ 56
Schedule of Utility Inventory	The components of inventory are presented in the tables below. September 30, 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 $ 2,341 $ 779 $ 1,021 $ 682 $ 340 $ 79 $ 314 $ 13 Coal 546 173 168 120 48 12 192 — Natural gas, oil and other fuel 303 40 189 108 80 39 1 34 Total inventory $ 3,190 $ 992 $ 1,378 $ 910 $ 468 $ 130 $ 507 $ 47 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 Materials and supplies $ 2,297 $ 768 $ 1,038 $ 686 $ 351 $ 79 $ 318 $ 5 Coal 586 187 186 138 48 15 198 — Natural gas, oil and other fuel 349 41 199 110 90 41 1 67 Total inventory $ 3,232 $ 996 $ 1,423 $ 934 $ 489 $ 135 $ 517 $ 72
Schedule 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)	9 Months Ended
	Sep. 30, 2020
Segment Reporting Information [Line Items]
Business Segment Data	Business segment information is presented in the following tables. Segment assets presented exclude intercompany assets. Three Months Ended September 30, 2020 Electric Gas Total Utilities and Utilities and Commercial Reportable (in millions) Infrastructure Infrastructure Renewables Segments Other Eliminations Total Unaffiliated revenues $ 6,371 $ 217 $ 126 $ 6,714 $ 7 $ — $ 6,721 Intersegment revenues 8 24 — 32 17 (49 ) — Total revenues $ 6,379 $ 241 $ 126 $ 6,746 $ 24 $ (49 ) $ 6,721 Segment income (loss) (a)(b) $ 1,381 $ (73 ) $ 60 $ 1,368 $ (103 ) $ — $ 1,265 Less: Noncontrolling interests 70 Add: Preferred stock dividend 39 Net Income $ 1,234 Segment assets $ 138,142 $ 13,343 $ 6,541 $ 158,026 $ 3,387 $ (4 ) $ 161,409 Three Months Ended September 30, 2019 Electric Gas Total Utilities and Utilities and Commercial Reportable (in millions) Infrastructure Infrastructure Renewables Segments Other Eliminations Total Unaffiliated revenues $ 6,569 $ 225 $ 138 $ 6,932 $ 8 $ — $ 6,940 Intersegment revenues 8 24 — 32 17 (49 ) — Total revenues $ 6,577 $ 249 $ 138 $ 6,964 $ 25 $ (49 ) $ 6,940 Segment income (loss) (c) $ 1,385 $ 26 $ 40 $ 1,451 $ (124 ) $ — $ 1,327 Less: Noncontrolling interests 19 Add: Preferred stock dividend 15 Net Income $ 1,323 (a) Electric Utilities and Infrastructure includes $19 million recorded within Impairment charges and $8 million recorded within Operations, maintenance and other on the Duke Energy Carolinas' Condensed Consolidated Statements of Operations related to a partial settlement in the Duke Energy Carolinas' 2019 North Carolina rate case and $8 million recorded within Operations, maintenance and other on Duke Energy Progress' Condensed Consolidated Statements of Operation related to a partial settlement in the Duke Energy Progress' 2019 North Carolina rate case. See Note 3 for more information. Additionally, Electric Utilities and Infrastructure includes $5 million of Impairment charges related to gas pipeline assets recorded on Duke Energy Progress' Condensed Consolidated Statements of Operations. (b) Gas Utilities and Infrastructure includes $78 million recorded within Equity in (losses) earnings of unconsolidated affiliates on the Condensed Consolidated Statements of Operations and $7 million in Impairment charges recorded on the Piedmont Condensed Consolidated Statements of Operations related to gas pipeline investments. (c) Electric Utilities and Infrastructure includes a $25 million reduction of a prior year impairment recorded at Citrus County CC related to the plant's cost cap and is recorded within Impairment charges on Duke Energy Florida's Condensed Consolidated Statements of Operations. Nine Months Ended September 30, 2020 Electric Gas Total Utilities and Utilities and Commercial Reportable (in millions) Infrastructure Infrastructure Renewables Segments Other Eliminations Total Unaffiliated revenues $ 16,571 $ 1,122 $ 378 $ 18,071 $ 20 $ — $ 18,091 Intersegment revenues 25 72 — 97 53 (150 ) — Total revenues $ 16,596 $ 1,194 $ 378 $ 18,168 $ 73 $ (150 ) $ 18,091 Segment income (loss) (a)(b)(c) $ 2,839 $ (1,400 ) $ 207 $ 1,646 $ (299 ) $ — $ 1,347 Less: Noncontrolling interests 208 Add: Preferred stock dividend 93 Net Income $ 1,232 Nine Months Ended September 30, 2019 Electric Gas Total Utilities and Utilities and Commercial Reportable (in millions) Infrastructure Infrastructure Renewables Segments Other Eliminations Total Unaffiliated revenues $ 17,357 $ 1,239 $ 362 $ 18,958 $ 18 $ — $ 18,976 Intersegment revenues 24 72 — 96 53 (149 ) — Total revenues $ 17,381 $ 1,311 $ 362 $ 19,054 $ 71 $ (149 ) $ 18,976 Segment income (loss) (d) $ 2,944 $ 292 $ 139 $ 3,375 $ (328 ) $ — $ 3,047 Less: Noncontrolling interests 110 Add: Preferred stock dividend 27 Net Income $ 2,964 (a) Electric Utilities and Infrastructure includes $19 million recorded within Impairment charges and $8 million recorded within Operations, maintenance and other on the Duke Energy Carolinas' Condensed Consolidated Statements of Operations related to a partial settlement in the Duke Energy Carolinas' 2019 North Carolina rate case and $8 million recorded within Operations, maintenance and other on Duke Energy Progress' Condensed Consolidated Statements of Operation related to a partial settlement in the Duke Energy Progress' 2019 North Carolina rate case. See Note 3 for more information. Additionally, Electric Utilities and Infrastructure includes $5 million of Impairment charges related to gas pipeline assets recorded on Duke Energy Progress' Condensed Consolidated Statements of Operations. (b) Gas Utilities and Infrastructure includes $2.1 billion recorded within Equity in (losses) earnings of unconsolidated affiliates on the Condensed Consolidated Statements of Operations and $7 million of Impairment charges recorded on the Piedmont Condensed Consolidated Statements of Operations related to gas pipeline investments. See Notes 3 and 12 for additional information. (c) Other includes a $98 million reversal, included in Operations, maintenance and other on the Condensed Consolidated Statements of Operations, of 2018 severance costs due to a partial settlement in the Duke Energy Carolinas' 2019 North Carolina rate case. See Note 3 for additional information. (d) Electric Utilities and Infrastructure includes a $25 million reduction of a prior year impairment recorded at Citrus County CC related to the plant's costs cap and is recorded within Impairment charges on Duke Energy Florida's Condensed Consolidated Statements of Operations.
Duke Energy Ohio
Segment Reporting Information [Line Items]
Business Segment Data	Three Months Ended September 30, 2020 Electric Gas Total Utilities and Utilities and Reportable (in millions) Infrastructure Infrastructure Segments Other Eliminations Total Total revenues $ 394 $ 79 $ 473 $ — $ — $ 473 Segment income/Net income $ 63 $ 9 $ 72 $ (2 ) $ — $ 70 Segment assets $ 6,448 $ 3,297 $ 9,745 $ 27 $ (23 ) $ 9,749 Three Months Ended September 30, 2019 Electric Gas Total Utilities and Utilities and Reportable (in millions) Infrastructure Infrastructure Segments Other Total Total revenues $ 408 $ 81 $ 489 $ — $ 489 Segment income/Net income $ 62 $ 13 $ 75 $ (1 ) $ 74 Nine Months Ended September 30, 2020 Electric Gas Total Utilities and Utilities and Reportable (in millions) Infrastructure Infrastructure Segments Other Total Total revenues $ 1,070 $ 324 $ 1,394 $ — $ 1,394 Segment income/Net (loss) income $ 137 $ 68 $ 205 $ (4 ) $ 201 Nine Months Ended September 30, 2019 Electric Gas Total Utilities and Utilities and Reportable (in millions) Infrastructure Infrastructure Segments Other Total Total revenues $ 1,099 $ 354 $ 1,453 $ — $ 1,453 Segment income/Net (loss) income $ 129 $ 65 $ 194 $ (4 ) $ 190

Regulatory Matters (Tables)

Regulatory Matters (Tables)	9 Months Ended
	Sep. 30, 2020
Regulated Operations [Abstract]
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 Condensed Consolidated Balance Sheets as of September 30, 2020 , and exclude capitalized asset retirement costs. Remaining Net Capacity Book Value (in MW) (in millions) Duke Energy Carolinas Allen Steam Station Units 1-3 (a) 582 $ 141 Allen Steam Station Units 4-5 (b) 516 321 Cliffside Unit 5 (b) 544 355 Duke Energy Progress Mayo Unit 1 (b) 727 673 Roxboro Units 3-4 (b) 1,392 486 Duke Energy Indiana Gallagher Units 2 and 4 (c) 280 112 Gibson Units 1-5 (d) 3,132 1,683 Cayuga Units 1-2 (d) 1,005 935 Total Duke Energy 8,178 $ 4,706 (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. (b) These units are 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. A decision by NCUC is expected by the end of the first quarter 2021. (c) Duke Energy Indiana committed to either retire or stop burning coal at Gallagher units 2 and 4 by December 31, 2022, as part of the 2016 settlement of Edwardsport IGCC matters. (d) On July 1, 2019, Duke Energy Indiana filed its 2018 IRP with the IURC. The 2018 IRP included scenarios evaluating the potential retirement of coal-fired generating units at Gibson and Cayuga. 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.

Commitments and Contingencies (

Commitments and Contingencies (Tables)	9 Months Ended
	Sep. 30, 2020
Commitments and Contingencies Disclosure [Abstract]
Schedule of Reserves	The table below presents recorded reserves based on management’s best estimate of probable loss for legal matters, excluding asbestos-related reserves discussed above. Reserves are classified on the Condensed Consolidated Balance Sheets in Other within Other Noncurrent Liabilities and Other within Current Liabilities. The reasonably possible range of loss in excess of recorded reserves is not material, other than as described above. (in millions) September 30, 2020 December 31, 2019 Reserves for Legal Matters Duke Energy $ 60 $ 62 Duke Energy Carolinas 2 2 Progress Energy 52 55 Duke Energy Progress 9 12 Duke Energy Florida 23 22 Piedmont 1 1 The following table contains information regarding reserves for probable and estimable costs related to the various environmental sites. These reserves are recorded in Accounts Payable within Current Liabilities and Other within Other Noncurrent Liabilities on the Condensed Consolidated Balance Sheets. (in millions) September 30, 2020 December 31, 2019 Reserves for Environmental Remediation Duke Energy $ 66 $ 58 Duke Energy Carolinas 16 11 Progress Energy 15 16 Duke Energy Progress 5 4 Duke Energy Florida 8 9 Duke Energy Ohio 22 19 Duke Energy Indiana 5 4 Piedmont 8 8
Schedule of Additional Possible Losses in Excess of Recorded Environmental Reserves	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 except as presented in the table below. (in millions) Duke Energy $ 56 Duke Energy Carolinas 12 Duke Energy Ohio 38

Debt and Credit Facilities (Tab

Debt and Credit Facilities (Tables)	9 Months Ended
	Sep. 30, 2020
Debt Disclosure [Abstract]
Schedule of Long-term Debt Instruments	The following table summarizes significant debt issuances (in millions). Nine Months Ended September 30, 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) Jun 2030 2.450 % $ 500 $ 500 $ — $ — $ — $ — $ — $ — May 2020 (b) Jun 2050 3.350 % 400 — — — — — 400 August 2020 (c) Feb 2022 0.430 % (d) 700 — — 700 — — — — September 2020 (e) Sep 2025 0.900 % 650 650 — — — — — — September 2020 (e) Jun 2030 2.450 % 350 350 — — — — — — First Mortgage Bonds January 2020 (f) Feb 2030 2.450 % 500 — 500 — — — — — January 2020 (f) Aug 2049 3.200 % 400 — 400 — — — — — March 2020 (g) Apr 2050 2.750 % 550 — — — — — 550 — May 2020 (b) Jun 2030 2.125 % 400 — — — — 400 — — June 2020 (b) Jun 2030 1.750 % 500 — — — 500 — — — August 2020 (h) Aug 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 two-year term loan facility expiring in 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. The following table shows the significant components of Current maturities of long-term debt on the Condensed 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 September 30, 2020 Unsecured Debt Progress Energy, Inc January 2021 4.400 % $ 500 Duke Energy (Parent) May 2021 0.765 % (a) 500 Piedmont June 2021 4.240 % 160 Duke Energy (Parent) September 2021 3.550 % 500 Duke Energy (Parent) September 2021 1.800 % 750 Secured Debt Duke Energy Florida April 2021 1.035 % (a) 250 First Mortgage Bonds Duke Energy Carolinas June 2021 3.900 % 500 Duke Energy Florida August 2021 3.100 % 300 Duke Energy Progress September 2021 3.000 % 500 Duke Energy Progress September 2021 8.625 % 100 Other (b) 609 Current maturities of long-term debt $ 4,669 (a) Debt has a floating interest rate. (b) Includes finance lease obligations, amortizing debt and small bullet maturities.
Schedule Of Line Of Credit Facilities	The table below includes the current borrowing sublimits and available capacity under these credit facilities. September 30, 2020 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 $ 1,475 $ 1,250 $ 800 $ 625 $ 600 $ 600 Reduction to backstop issuances Commercial paper (b) (2,007 ) (693 ) (300 ) (308 ) (62 ) (106 ) (229 ) (309 ) Outstanding letters of credit (40 ) (34 ) (4 ) (2 ) — — — — Tax-exempt bonds (81 ) — — — — — (81 ) — Available capacity under the Master Credit Facility $ 5,872 $ 1,923 $ 1,171 $ 940 $ 738 $ 519 $ 290 $ 291 (a) Represents the sublimit of each borrower. (b) Duke Energy issued $625 million September 30, 2020 (in millions) Facility size Amount drawn Duke Energy (Parent) Three-Year Revolving Credit Facility $ 1,000 $ 500

Asset Retirement Obligations (T

Asset Retirement Obligations (Tables)	9 Months Ended
	Sep. 30, 2020
Asset Retirement Obligation [Abstract]
Schedule of Asset Retirement Obligations	The following table presents the AROs recorded on the Condensed Consolidated Balance Sheets. September 30, 2020 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) $ 6,815 $ 2,658 $ 4,107 $ 3,606 $ 501 $ — $ — $ — Closure of ash impoundments 6,458 3,049 2,172 2,150 22 51 1,186 — Other 381 67 76 44 32 40 28 17 Total ARO $ 13,654 $ 5,774 $ 6,355 $ 5,800 $ 555 $ 91 $ 1,214 $ 17 Less: Current portion 742 267 297 297 — 7 170 — Total noncurrent ARO $ 12,912 $ 5,507 $ 6,058 $ 5,503 $ 555 $ 84 $ 1,044 $ 17 (a) Duke Energy amount includes purchase accounting adjustments related to the merger with Progress Energy.
Schedule of Change in Asset Retirement Obligation	The following table presents the change in liability associated with AROs for the Duke Energy Registrants. 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 (a) $ 13,318 $ 5,734 $ 6,471 $ 5,893 $ 578 $ 80 $ 832 $ 17 Accretion expense (b) 408 195 187 171 16 3 22 — Liabilities settled (c) (540 ) (151 ) (333 ) (293 ) (40 ) (1 ) (56 ) — Liabilities incurred in the current year 17 — — — — — — — Revisions in estimates of cash flows (d) 451 (4 ) 30 29 1 9 416 — Balance at September 30, 2020 $ 13,654 $ 5,774 $ 6,355 $ 5,800 $ 555 $ 91 $ 1,214 $ 17 (a) Primarily relates to decommissioning nuclear power facilities, closure of ash impoundments, asbestos removal, closure of landfills at fossil generation facilities, retirement of natural gas mains and removal of renewable energy generation assets. (b) For the nine months ended September 30, 2020 , substantially all accretion expense relates to Duke Energy's regulated operations and has been deferred in accordance with regulatory accounting treatment. (c) Primarily relates to ash impoundment closures. (d) Primarily relates to increases in closure estimates for certain ash impoundments as a result of certain changes in estimates and 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, new closure plan approvals, as well as increased post closure maintenance, landfill and beneficiation costs. See Note 4 for more information on Hoosier Environmental Council's petition. The incremental amount recorded represents 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.

Goodwill (Tables)

Goodwill (Tables)	9 Months Ended
	Sep. 30, 2020
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill By Reportable Operating Segment	The following table presents the goodwill by reportable segment included on Duke Energy's Condensed Consolidated Balance Sheets at September 30, 2020 , and December 31, 2019 . Electric Utilities Gas Utilities Commercial (in millions) and Infrastructure and Infrastructure Renewables Total Goodwill balance $ 17,379 $ 1,924 $ 122 $ 19,425 Accumulated impairment charges — — (122 ) (122 ) Goodwill, adjusted for accumulated impairment charges $ 17,379 $ 1,924 $ — $ 19,303

Related Party Transactions (Tab

Related Party Transactions (Tables)	9 Months Ended
	Sep. 30, 2020
Related Party Transactions [Abstract]
Schedule of Related Party Transactions, Other Revenue and Expense	Material amounts related to transactions with related parties included on the Condensed Consolidated Statements of Operations and Comprehensive Income are presented in the following table. Three Months Ended September 30, Nine Months Ended September 30, (in millions) 2020 2019 2020 2019 Duke Energy Carolinas Corporate governance and shared service expenses (a) $ 198 $ 197 $ 528 $ 606 Indemnification coverages (b) 5 5 15 15 Joint Dispatch Agreement (JDA) revenue (c) 6 12 16 52 JDA expense (c) 28 32 72 145 Intercompany natural gas purchases (d) 10 — 26 7 Progress Energy Corporate governance and shared service expenses (a) $ 185 $ 194 $ 520 $ 553 Indemnification coverages (b) 9 8 27 27 JDA revenue (c) 28 32 72 145 JDA expense (c) 6 12 16 52 Intercompany natural gas purchases (d) 18 19 56 57 Duke Energy Progress Corporate governance and shared service expenses (a) $ 113 $ 114 $ 301 $ 328 Indemnification coverages (b) 4 3 13 11 JDA revenue (c) 28 32 72 145 JDA expense (c) 6 12 16 52 Intercompany natural gas purchases (d) 18 19 56 57 Duke Energy Florida Corporate governance and shared service expenses (a) $ 72 $ 80 $ 219 $ 225 Indemnification coverages (b) 5 5 14 16 Duke Energy Ohio Corporate governance and shared service expenses (a) $ 80 $ 90 $ 241 $ 258 Indemnification coverages (b) 1 1 3 3 Duke Energy Indiana Corporate governance and shared service expenses (a) $ 102 $ 109 $ 300 $ 299 Indemnification coverages (b) 2 2 6 5 Piedmont Corporate governance and shared service expenses (a) $ 31 $ 33 $ 102 $ 102 Indemnification coverages (b) 1 1 2 2 Intercompany natural gas sales (d) 28 19 82 64 Natural gas storage and transportation costs (e) 6 6 17 17 (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 Condensed 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 Condensed 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 Condensed 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 Condensed Consolidated Statements of Operations and Comprehensive Income. (e) Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Carolinas Energy Progress Florida Ohio Indiana Piedmont September 30, 2020 Intercompany income tax receivable $ — $ — $ — $ — $ — $ — $ 14 Intercompany income tax payable 206 49 104 98 6 56 — December 31, 2019 Intercompany income tax receivable $ — $ 125 $ 28 $ — $ 9 $ 28 $ 13 Intercompany income tax payable 5 — — 2 — — —

Derivatives and Hedging (Tables

Derivatives and Hedging (Tables)	9 Months Ended
	Sep. 30, 2020
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Notional Amounts of Outstanding Derivative Positions	The following table shows notional amounts of outstanding derivatives related to interest rate risk. September 30, 2020 Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Cash flow hedges $ 653 $ — $ — $ — $ — $ — Undesignated contracts 1,177 400 750 750 — 27 Total notional amount (a) $ 1,830 $ 400 $ 750 $ 750 $ — $ 27 December 31, 2019 Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Cash flow hedges $ 993 $ — $ — $ — $ — $ — Undesignated contracts 1,277 450 800 250 550 27 Total notional amount (a) $ 2,270 $ 450 $ 800 $ 250 $ 550 $ 27 (a) Duke Energy includes amounts related to consolidated VIEs of $653 million in cash flow hedges as of September 30, 2020 , and $693 million in cash flow hedges as of December 31, 2019 . 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. September 30, 2020 Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy Carolinas Energy Progress Ohio Indiana Piedmont Electricity (GWh) (a) 32,314 — — — 4,126 17,072 — Natural gas (millions of dekatherms) 683 143 156 156 — 2 382 December 31, 2019 Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy Carolinas Energy Progress Ohio Indiana Piedmont Electricity (GWh) 15,858 — — — 1,887 13,971 — Natural gas (millions of dekatherms) 704 130 160 160 — 3 411 (a) Duke Energy includes 11,116 GWh that relates to cash flow hedges.
Location And Fair Value Of Derivatives Recognized in the Condensed 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 Condensed 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 September 30, 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 $ 57 $ 24 $ 18 $ 18 $ — $ 2 $ 8 $ 6 Noncurrent 26 14 12 12 — — — — Total Derivative Assets – Commodity Contracts $ 83 $ 38 $ 30 $ 30 $ — $ 2 $ 8 $ 6 Interest Rate Contracts Not Designated as Hedging Instruments Current $ 3 $ — $ 3 $ 3 $ — $ — $ — $ — Noncurrent — — — — — — — — Total Derivative Assets – Interest Rate Contracts $ 3 $ — $ 3 $ 3 $ — $ — $ — $ — Total Derivative Assets $ 86 $ 38 $ 33 $ 33 $ — $ 2 $ 8 $ 6 Derivative Liabilities September 30, 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 $ 17 $ — $ — $ — $ — $ — $ — — Noncurrent 85 — — — — — — — Not Designated as Hedging Instruments Current $ 26 $ 12 $ — $ — $ — $ 1 $ — $ 13 Noncurrent 129 4 27 11 — — — 98 Total Derivative Liabilities – Commodity Contracts $ 257 $ 16 $ 27 $ 11 $ — $ 1 $ — $ 111 Interest Rate Contracts Designated as Hedging Instruments Current $ 14 $ — $ — $ — $ — $ — $ — $ — Noncurrent 56 — — — — — — — Not Designated as Hedging Instruments Current 27 17 9 9 — 1 — — Noncurrent 5 — — — — 5 — — Total Derivative Liabilities – Interest Rate Contracts $ 102 $ 17 $ 9 $ 9 $ — $ 6 $ — $ — Total Derivative Liabilities $ 359 $ 33 $ 36 $ 20 $ — $ 7 $ — $ 111 Derivative Assets 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 Commodity Contracts Not Designated as Hedging Instruments Current $ 17 $ — $ — $ — $ — $ 3 $ 13 $ 1 Noncurrent 1 — — — — 1 — — Total Derivative Assets – Commodity Contracts $ 18 $ — $ — $ — $ — $ 4 $ 13 $ 1 Interest Rate Contracts Not Designated as Hedging Instruments Current 6 — 6 — 6 — — — Total Derivative Assets – Interest Rate Contracts $ 6 $ — $ 6 $ — $ 6 $ — $ — $ — Equity Securities Contracts Not Designated as Hedging Instruments Current 1 — 1 — 1 — — — Total Derivative Assets – Equity Securities Contracts $ 1 $ — $ 1 $ — $ 1 $ — $ — $ — Total Derivative Assets $ 25 $ — $ 7 $ — $ 7 $ 4 $ 13 $ 1 Derivative Liabilities 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 Commodity Contracts Not Designated as Hedging Instruments Current $ 67 $ 33 $ 26 $ 26 $ — $ — $ 1 $ 7 Noncurrent 156 10 37 22 — — — 110 Total Derivative Liabilities – Commodity Contracts $ 223 $ 43 $ 63 $ 48 $ — $ — $ 1 $ 117 Interest Rate Contracts Designated as Hedging Instruments Current $ 19 $ — $ — $ — $ — $ — $ — $ — Noncurrent 21 — — — — — — — Not Designated as Hedging Instruments Current 8 6 1 1 — 1 — — Noncurrent 5 — — — — 5 — — Total Derivative Liabilities – Interest Rate Contracts $ 53 $ 6 $ 1 $ 1 $ — $ 6 $ — $ — Equity Securities Contracts Not Designated as Hedging Instruments Current 24 — 24 — 24 — — — Total Derivative Liabilities – Equity Securities Contracts $ 24 $ — $ 24 $ — $ 24 $ — $ — $ — Total Derivative Liabilities $ 300 $ 49 $ 88 $ 49 $ 24 $ 6 $ 1 $ 117
Offsetting Assets	The following tables present the line items on the Condensed 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 September 30, 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 $ 60 $ 24 $ 21 $ 21 $ — $ 2 $ 8 $ 6 Gross amounts offset (1 ) — — — — — — — Net amounts presented in Current Assets: Other $ 59 $ 24 $ 21 $ 21 $ — $ 2 $ 8 $ 6 Noncurrent Gross amounts recognized $ 26 $ 14 $ 12 $ 12 $ — $ — $ — $ — Gross amounts offset (8 ) — (8 ) (8 ) — — — — Net amounts presented in Other Noncurrent Assets: Other $ 18 $ 14 $ 4 $ 4 $ — $ — $ — $ — Derivative Liabilities September 30, 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 $ 84 $ 29 $ 9 $ 9 $ — $ 2 $ — $ 13 Gross amounts offset (1 ) — — — — — — — Net amounts presented in Current Liabilities: Other $ 83 $ 29 $ 9 $ 9 $ — $ 2 $ — $ 13 Noncurrent Gross amounts recognized $ 275 $ 4 $ 27 $ 11 $ — $ 5 $ — $ 98 Gross amounts offset (8 ) — (8 ) (8 ) — — — — Net amounts presented in Other Noncurrent Liabilities: Other $ 267 $ 4 $ 19 $ 3 $ — $ 5 $ — $ 98 Derivative Assets 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 Gross amounts recognized $ 24 $ — $ 7 $ — $ 7 $ 3 $ 13 $ 1 Gross amounts offset (1 ) — (1 ) — (1 ) — — — Net amounts presented in Current Assets: Other $ 23 $ — $ 6 $ — $ 6 $ 3 $ 13 $ 1 Noncurrent Gross amounts recognized $ 1 $ — $ — $ — $ — $ 1 $ — $ — Gross amounts offset — — — — — — — — Net amounts presented in Other Noncurrent Assets: Other $ 1 $ — $ — $ — $ — $ 1 $ — $ — Derivative Liabilities 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 Gross amounts recognized $ 118 $ 39 $ 51 $ 27 $ 24 $ 1 $ 1 $ 7 Gross amounts offset (24 ) — (24 ) — (24 ) — — — Net amounts presented in Current Liabilities: Other $ 94 $ 39 $ 27 $ 27 $ — $ 1 $ 1 $ 7 Noncurrent Gross amounts recognized $ 182 $ 10 $ 37 $ 22 $ — $ 5 $ — $ 110 Gross amounts offset — — — — — — — — Net amounts presented in Other Noncurrent Liabilities: Other $ 182 $ 10 $ 37 $ 22 $ — $ 5 $ — $ 110
Offsetting Liabilities	The following tables present the line items on the Condensed 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 September 30, 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 $ 60 $ 24 $ 21 $ 21 $ — $ 2 $ 8 $ 6 Gross amounts offset (1 ) — — — — — — — Net amounts presented in Current Assets: Other $ 59 $ 24 $ 21 $ 21 $ — $ 2 $ 8 $ 6 Noncurrent Gross amounts recognized $ 26 $ 14 $ 12 $ 12 $ — $ — $ — $ — Gross amounts offset (8 ) — (8 ) (8 ) — — — — Net amounts presented in Other Noncurrent Assets: Other $ 18 $ 14 $ 4 $ 4 $ — $ — $ — $ — Derivative Liabilities September 30, 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 $ 84 $ 29 $ 9 $ 9 $ — $ 2 $ — $ 13 Gross amounts offset (1 ) — — — — — — — Net amounts presented in Current Liabilities: Other $ 83 $ 29 $ 9 $ 9 $ — $ 2 $ — $ 13 Noncurrent Gross amounts recognized $ 275 $ 4 $ 27 $ 11 $ — $ 5 $ — $ 98 Gross amounts offset (8 ) — (8 ) (8 ) — — — — Net amounts presented in Other Noncurrent Liabilities: Other $ 267 $ 4 $ 19 $ 3 $ — $ 5 $ — $ 98 Derivative Assets 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 Gross amounts recognized $ 24 $ — $ 7 $ — $ 7 $ 3 $ 13 $ 1 Gross amounts offset (1 ) — (1 ) — (1 ) — — — Net amounts presented in Current Assets: Other $ 23 $ — $ 6 $ — $ 6 $ 3 $ 13 $ 1 Noncurrent Gross amounts recognized $ 1 $ — $ — $ — $ — $ 1 $ — $ — Gross amounts offset — — — — — — — — Net amounts presented in Other Noncurrent Assets: Other $ 1 $ — $ — $ — $ — $ 1 $ — $ — Derivative Liabilities 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 Gross amounts recognized $ 118 $ 39 $ 51 $ 27 $ 24 $ 1 $ 1 $ 7 Gross amounts offset (24 ) — (24 ) — (24 ) — — — Net amounts presented in Current Liabilities: Other $ 94 $ 39 $ 27 $ 27 $ — $ 1 $ 1 $ 7 Noncurrent Gross amounts recognized $ 182 $ 10 $ 37 $ 22 $ — $ 5 $ — $ 110 Gross amounts offset — — — — — — — — Net amounts presented in Other Noncurrent Liabilities: Other $ 182 $ 10 $ 37 $ 22 $ — $ 5 $ — $ 110
Derivative Contracts with Contingent Credit Features	The following tables show information with respect to derivative contracts that are in a net liability position and contain objective credit-risk-related payment provisions. September 30, 2020 Duke Duke Duke Energy Progress Energy (in millions) Energy Carolinas Energy Progress Aggregate fair value of derivatives in a net liability position $ 20 $ 9 $ 11 $ 11 Fair value of collateral already posted — — — — Additional cash collateral or letters of credit in the event credit-risk-related contingent features were triggered 20 9 11 11 December 31, 2019 Duke Duke Duke Energy Progress Energy (in millions) Energy Carolinas Energy Progress Aggregate fair value of derivatives in a net liability position $ 79 $ 35 $ 44 $ 44 Fair value of collateral already posted — — — — Additional cash collateral or letters of credit in the event credit-risk-related contingent features were triggered 79 35 44 44

Investments in Debt and Equit_2

Investments in Debt and Equity Securities (Tables)	9 Months Ended
	Sep. 30, 2020
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Trading, and Equity Securities, FV-NI	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. September 30, 2020 December 31, 2019 Gross Gross Gross Gross Unrealized Unrealized Estimated Unrealized Unrealized Estimated Holding Holding Fair Holding Holding Fair (in millions) Gains Losses Value Gains Losses Value NDTF Cash and cash equivalents $ — $ — $ 687 $ — $ — $ 101 Equity securities 3,436 103 5,459 3,523 55 5,661 Corporate debt securities 65 1 789 37 1 603 Municipal bonds 19 1 407 13 — 368 U.S. government bonds 58 — 843 33 1 1,256 Other debt securities 9 — 185 3 — 141 Total NDTF Investments $ 3,587 $ 105 $ 8,370 $ 3,609 $ 57 $ 8,130 Other Investments Cash and cash equivalents $ — $ — $ 110 $ — $ — $ 52 Equity securities 60 — 126 57 — 122 Corporate debt securities 8 — 129 3 — 67 Municipal bonds 6 1 114 4 — 94 U.S. government bonds 1 — 21 2 — 41 Other debt securities — — 44 — — 56 Total Other Investments $ 75 $ 1 $ 544 $ 66 $ — $ 432 Total Investments $ 3,662 $ 106 $ 8,914 $ 3,675 $ 57 $ 8,562
Debt Securities, Available-for-sale	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. September 30, 2020 December 31, 2019 Gross Gross Gross Gross Unrealized Unrealized Estimated Unrealized Unrealized Estimated Holding Holding Fair Holding Holding Fair (in millions) Gains Losses Value Gains Losses Value NDTF Cash and cash equivalents $ — $ — $ 687 $ — $ — $ 101 Equity securities 3,436 103 5,459 3,523 55 5,661 Corporate debt securities 65 1 789 37 1 603 Municipal bonds 19 1 407 13 — 368 U.S. government bonds 58 — 843 33 1 1,256 Other debt securities 9 — 185 3 — 141 Total NDTF Investments $ 3,587 $ 105 $ 8,370 $ 3,609 $ 57 $ 8,130 Other Investments Cash and cash equivalents $ — $ — $ 110 $ — $ — $ 52 Equity securities 60 — 126 57 — 122 Corporate debt securities 8 — 129 3 — 67 Municipal bonds 6 1 114 4 — 94 U.S. government bonds 1 — 21 2 — 41 Other debt securities — — 44 — — 56 Total Other Investments $ 75 $ 1 $ 544 $ 66 $ — $ 432 Total Investments $ 3,662 $ 106 $ 8,914 $ 3,675 $ 57 $ 8,562
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 three and nine months ended September 30, 2020 , and 2019 , were as follows. Three Months Ended Nine Months Ended (in millions) September 30, 2020 September 30, 2019 September 30, 2020 September 30, 2019 FV-NI: Realized gains $ 13 $ 60 $ 338 $ 161 Realized losses 16 43 148 136 AFS: Realized gains 26 53 73 110 Realized losses 19 36 38 83
Investments Classified by Contractual Maturity Date	The table below summarizes the maturity date for debt securities. September 30, 2020 Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Indiana Due in one year or less $ 53 $ 13 $ 15 $ 14 $ 1 $ 4 Due after one through five years 558 247 256 246 10 16 Due after five through 10 years 608 278 232 224 8 9 Due after 10 years 1,313 694 542 508 34 16 Total $ 2,532 $ 1,232 $ 1,045 $ 992 $ 53 $ 45
Duke Energy Carolinas
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Trading, and Equity Securities, FV-NI	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. September 30, 2020 December 31, 2019 Gross Gross Gross Gross Unrealized Unrealized Estimated Unrealized Unrealized Estimated Holding Holding Fair Holding Holding Fair (in millions) Gains Losses Value Gains Losses Value NDTF Cash and cash equivalents $ — $ — $ 42 $ — $ — $ 21 Equity securities 2,027 52 3,229 1,914 8 3,154 Corporate debt securities 42 1 507 21 1 361 Municipal bonds 5 — 118 3 — 96 U.S. government bonds 28 — 428 16 1 578 Other debt securities 7 — 179 3 — 137 Total NDTF Investments $ 2,109 $ 53 $ 4,503 $ 1,957 $ 10 $ 4,347
Debt Securities, Available-for-sale	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. September 30, 2020 December 31, 2019 Gross Gross Gross Gross Unrealized Unrealized Estimated Unrealized Unrealized Estimated Holding Holding Fair Holding Holding Fair (in millions) Gains Losses Value Gains Losses Value NDTF Cash and cash equivalents $ — $ — $ 42 $ — $ — $ 21 Equity securities 2,027 52 3,229 1,914 8 3,154 Corporate debt securities 42 1 507 21 1 361 Municipal bonds 5 — 118 3 — 96 U.S. government bonds 28 — 428 16 1 578 Other debt securities 7 — 179 3 — 137 Total NDTF Investments $ 2,109 $ 53 $ 4,503 $ 1,957 $ 10 $ 4,347
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 three and nine months ended September 30, 2020 , and 2019 , were as follows. Three Months Ended Nine Months Ended (in millions) September 30, 2020 September 30, 2019 September 30, 2020 September 30, 2019 FV-NI: Realized gains $ 10 $ 34 $ 46 $ 101 Realized losses 12 26 82 95 AFS: Realized gains 20 21 50 46 Realized losses 17 13 30 34
Progress Energy
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Trading, and Equity Securities, FV-NI	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. September 30, 2020 December 31, 2019 Gross Gross Gross Gross Unrealized Unrealized Estimated Unrealized Unrealized Estimated Holding Holding Fair Holding Holding Fair (in millions) Gains Losses Value Gains Losses Value NDTF Cash and cash equivalents $ — $ — $ 645 $ — $ — $ 80 Equity securities 1,409 51 2,230 1,609 47 2,507 Corporate debt securities 23 — 282 16 — 242 Municipal bonds 14 1 289 10 — 272 U.S. government bonds 30 — 415 17 — 678 Other debt securities 2 — 6 — — 4 Total NDTF Investments $ 1,478 $ 52 $ 3,867 $ 1,652 $ 47 $ 3,783 Other Investments Cash and cash equivalents $ — $ — $ 107 $ — $ — $ 49 Municipal bonds 4 — 53 3 — 51 Total Other Investments $ 4 $ — $ 160 $ 3 $ — $ 100 Total Investments $ 1,482 $ 52 $ 4,027 $ 1,655 $ 47 $ 3,883
Debt Securities, Available-for-sale	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. September 30, 2020 December 31, 2019 Gross Gross Gross Gross Unrealized Unrealized Estimated Unrealized Unrealized Estimated Holding Holding Fair Holding Holding Fair (in millions) Gains Losses Value Gains Losses Value NDTF Cash and cash equivalents $ — $ — $ 645 $ — $ — $ 80 Equity securities 1,409 51 2,230 1,609 47 2,507 Corporate debt securities 23 — 282 16 — 242 Municipal bonds 14 1 289 10 — 272 U.S. government bonds 30 — 415 17 — 678 Other debt securities 2 — 6 — — 4 Total NDTF Investments $ 1,478 $ 52 $ 3,867 $ 1,652 $ 47 $ 3,783 Other Investments Cash and cash equivalents $ — $ — $ 107 $ — $ — $ 49 Municipal bonds 4 — 53 3 — 51 Total Other Investments $ 4 $ — $ 160 $ 3 $ — $ 100 Total Investments $ 1,482 $ 52 $ 4,027 $ 1,655 $ 47 $ 3,883
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 three and nine months ended September 30, 2020 , and 2019 , were as follows. Three Months Ended Nine Months Ended (in millions) September 30, 2020 September 30, 2019 September 30, 2020 September 30, 2019 FV-NI: Realized gains $ 3 $ 26 $ 292 $ 60 Realized losses 4 17 66 41 AFS: Realized gains 6 31 17 62 Realized losses 2 23 7 49
Duke Energy Progress
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Trading, and Equity Securities, FV-NI	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. September 30, 2020 December 31, 2019 Gross Gross Gross Gross Unrealized Unrealized Estimated Unrealized Unrealized Estimated Holding Holding Fair Holding Holding Fair (in millions) Gains Losses Value Gains Losses Value NDTF Cash and cash equivalents $ — $ — $ 57 $ — $ — $ 53 Equity securities 1,340 51 2,150 1,258 21 2,077 Corporate debt securities 23 — 282 16 — 242 Municipal bonds 14 1 289 10 — 272 U.S. government bonds 30 — 415 16 — 403 Other debt securities 2 — 6 — — 4 Total NDTF Investments $ 1,409 $ 52 $ 3,199 $ 1,300 $ 21 $ 3,051 Other Investments Cash and cash equivalents $ — $ — $ 1 $ — $ — $ 2 Total Other Investments $ — $ — $ 1 $ — $ — $ 2 Total Investments $ 1,409 $ 52 $ 3,200 $ 1,300 $ 21 $ 3,053
Debt Securities, Available-for-sale	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. September 30, 2020 December 31, 2019 Gross Gross Gross Gross Unrealized Unrealized Estimated Unrealized Unrealized Estimated Holding Holding Fair Holding Holding Fair (in millions) Gains Losses Value Gains Losses Value NDTF Cash and cash equivalents $ — $ — $ 57 $ — $ — $ 53 Equity securities 1,340 51 2,150 1,258 21 2,077 Corporate debt securities 23 — 282 16 — 242 Municipal bonds 14 1 289 10 — 272 U.S. government bonds 30 — 415 16 — 403 Other debt securities 2 — 6 — — 4 Total NDTF Investments $ 1,409 $ 52 $ 3,199 $ 1,300 $ 21 $ 3,051 Other Investments Cash and cash equivalents $ — $ — $ 1 $ — $ — $ 2 Total Other Investments $ — $ — $ 1 $ — $ — $ 2 Total Investments $ 1,409 $ 52 $ 3,200 $ 1,300 $ 21 $ 3,053
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 three and nine months ended September 30, 2020 , and 2019 , were as follows. Three Months Ended Nine Months Ended (in millions) September 30, 2020 September 30, 2019 September 30, 2020 September 30, 2019 FV-NI: Realized gains $ 3 $ 10 $ 43 $ 27 Realized losses 4 9 51 24 AFS: Realized gains 6 2 17 4 Realized losses 2 — 7 2
Duke Energy Florida
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Trading, and Equity Securities, FV-NI	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. September 30, 2020 December 31, 2019 Gross Gross Gross Gross Unrealized Unrealized Estimated Unrealized Unrealized Estimated Holding Holding Fair Holding Holding Fair (in millions) Gains Losses Value Gains Losses Value NDTF Cash and cash equivalents $ — $ — $ 588 $ — $ — $ 27 Equity securities 69 — 80 351 26 430 U.S. government bonds — — — 1 — 275 Total NDTF Investments (a) $ 69 $ — $ 668 $ 352 $ 26 $ 732 Other Investments Cash and cash equivalents $ — $ — $ 2 $ — $ — $ 4 Municipal bonds 4 — 53 3 — 51 Total Other Investments $ 4 $ — $ 55 $ 3 $ — $ 55 Total Investments $ 73 $ — $ 723 $ 355 $ 26 $ 787 (a) During the nine months ended September 30, 2020 , Duke Energy Florida continued to receive reimbursements from the NDTF for costs related to ongoing decommissioning activity of Crystal River Unit 3.
Debt Securities, Available-for-sale	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. September 30, 2020 December 31, 2019 Gross Gross Gross Gross Unrealized Unrealized Estimated Unrealized Unrealized Estimated Holding Holding Fair Holding Holding Fair (in millions) Gains Losses Value Gains Losses Value NDTF Cash and cash equivalents $ — $ — $ 588 $ — $ — $ 27 Equity securities 69 — 80 351 26 430 U.S. government bonds — — — 1 — 275 Total NDTF Investments (a) $ 69 $ — $ 668 $ 352 $ 26 $ 732 Other Investments Cash and cash equivalents $ — $ — $ 2 $ — $ — $ 4 Municipal bonds 4 — 53 3 — 51 Total Other Investments $ 4 $ — $ 55 $ 3 $ — $ 55 Total Investments $ 73 $ — $ 723 $ 355 $ 26 $ 787 (a) During the nine months ended September 30, 2020 , Duke Energy Florida continued to receive reimbursements from the NDTF for costs related to ongoing decommissioning activity of 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 three and nine months ended September 30, 2020 , and 2019 , were as follows. Three Months Ended Nine Months Ended (in millions) September 30, 2020 September 30, 2019 September 30, 2020 September 30, 2019 FV-NI: Realized gains $ — $ 16 $ 249 $ 33 Realized losses — 8 15 17 AFS: Realized gains — 29 — 58 Realized losses — 23 — 47
Duke Energy Indiana
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Trading, and Equity Securities, FV-NI	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. September 30, 2020 December 31, 2019 Gross Gross Gross Gross Unrealized Unrealized Estimated Unrealized Unrealized Estimated Holding Holding Fair Holding Holding Fair (in millions) Gains Losses Value Gains Losses Value Investments Cash and cash equivalents $ — $ — $ 1 $ — $ — $ — Equity securities 45 — 84 43 — 81 Corporate debt securities — — 3 — — 6 Municipal bonds 1 1 39 1 — 36 U.S. government bonds — — 3 — — 2 Total Investments $ 46 $ 1 $ 130 $ 44 $ — $ 125
Debt Securities, Available-for-sale	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. September 30, 2020 December 31, 2019 Gross Gross Gross Gross Unrealized Unrealized Estimated Unrealized Unrealized Estimated Holding Holding Fair Holding Holding Fair (in millions) Gains Losses Value Gains Losses Value Investments Cash and cash equivalents $ — $ — $ 1 $ — $ — $ — Equity securities 45 — 84 43 — 81 Corporate debt securities — — 3 — — 6 Municipal bonds 1 1 39 1 — 36 U.S. government bonds — — 3 — — 2 Total Investments $ 46 $ 1 $ 130 $ 44 $ — $ 125

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	9 Months Ended
	Sep. 30, 2020
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 Condensed Consolidated Balance Sheets. Derivative amounts in the tables below for all Duke Energy Registrants exclude cash collateral, which is disclosed in Note 9 . See Note 10 for additional information related to investments by major security type for the Duke Energy Registrants. September 30, 2020 (in millions) Total Fair Value Level 1 Level 2 Level 3 Not Categorized NDTF cash and cash equivalents $ 687 $ 687 $ — $ — $ — NDTF equity securities 5,459 5,413 — — 46 NDTF debt securities 2,224 363 1,861 — — Other equity securities 126 126 — — — Other debt securities 308 18 290 — — Other cash and cash equivalents 110 110 — — — Derivative assets 86 5 71 10 — Total assets 9,000 6,722 2,222 10 46 Derivative liabilities (359 ) (1 ) (145 ) (213 ) — Net assets (liabilities) $ 8,641 $ 6,721 $ 2,077 $ (203 ) $ 46 December 31, 2019 (in millions) Total Fair Value Level 1 Level 2 Level 3 Not Categorized NDTF cash and cash equivalents $ 101 $ 101 $ — $ — $ — NDTF equity securities 5,684 5,633 — — 51 NDTF debt securities 2,368 725 1,643 — — Other equity securities 122 122 — — — Other debt securities 258 39 219 — — Other cash and cash equivalents 52 52 — — — Derivative assets 25 3 7 15 — Total assets 8,610 6,675 1,869 15 51 NDTF equity security contracts (23 ) — (23 ) — — Derivative liabilities (277 ) (15 ) (145 ) (117 ) — Net assets (liabilities) $ 8,310 $ 6,660 $ 1,701 $ (102 ) $ 51
Reconciliation Of Assets And Liabilities Measured At Fair Value On A Recurring Basis Using Unobservable Inputs	The following tables provide reconciliations of beginning and ending balances of assets and liabilities measured at fair value using Level 3 measurements. Derivatives (net) Three Months Ended September 30, Nine Months Ended September 30, (in millions) 2020 2019 2020 2019 Balance at beginning of period $ (92 ) $ (79 ) $ (102 ) $ (113 ) Total pretax realized or unrealized gains included in comprehensive income (102 ) — (102 ) — Purchases, sales, issuances and settlements: Purchases — — 14 38 Settlements (3 ) (9 ) (18 ) (32 ) Total (losses) gains included on the Condensed Consolidated Balance Sheet (6 ) (2 ) 5 17 Balance at end of period $ (203 ) $ (90 ) $ (203 ) $ (90 )
Quantitative Information Table - Level 3	The following tables include quantitative information about the Duke Energy Registrants' derivatives classified as Level 3. September 30, 2020 Weighted Fair Value Average Investment Type (in millions) Valuation Technique Unobservable Input Range Range Duke Energy Electricity contracts $ (102 ) RTO forward pricing Forward electricity curves – price per MWh $ 14.92 - $ 151.18 $ 29.63 Duke Energy Ohio FTRs 2 RTO auction pricing FTR price – per MWh — - 1.90 0.64 Duke Energy Indiana FTRs 8 RTO auction pricing FTR price – per MWh (1.03 ) - 6.10 0.74 Piedmont Natural gas contracts (111 ) Discounted cash flow Forward natural gas curves – price per MMBtu 1.81 - 2.50 2.11 Duke Energy Total Level 3 derivatives $ (203 ) December 31, 2019 Weighted Fair Value Average Investment Type (in millions) Valuation Technique Unobservable Input Range Range Duke Energy Ohio FTRs $ 4 RTO auction pricing FTR price – per MWh $ 0.59 - $ 3.47 $ 2.07 Duke Energy Indiana FTRs 11 RTO auction pricing FTR price – per MWh (0.66 ) - 9.24 1.15 Piedmont Natural gas contracts (117 ) Discounted cash flow Forward natural gas curves – price per MMBtu 1.59 - 2.46 1.91 Duke Energy Total Level 3 derivatives $ (102 )
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. September 30, 2020 December 31, 2019 (in millions) Book Value Fair Value Book Value Fair Value Duke Energy (a) $ 60,718 $ 69,503 $ 58,126 $ 63,062 Duke Energy Carolinas 12,548 15,165 11,900 13,516 Progress Energy 19,865 23,825 19,634 22,291 Duke Energy Progress 9,358 10,808 9,058 9,934 Duke Energy Florida 7,917 9,684 7,987 9,131 Duke Energy Ohio 3,089 3,619 2,619 2,964 Duke Energy Indiana 4,104 5,140 4,057 4,800 Piedmont 2,780 3,276 2,384 2,642 (a) Book value of long-term debt includes $1.4 billion at September 30, 2020 , and $1.5 billion at December 31, 2019 , of unamortized debt discount and premium, net of 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 Condensed Consolidated Balance Sheets. September 30, 2020 (in millions) Total Fair Value Level 1 Level 2 Not Categorized NDTF cash and cash equivalents $ 42 $ 42 $ — $ — NDTF equity securities 3,229 3,183 — 46 NDTF debt securities 1,232 131 1,101 — Derivative assets 38 — 38 — Total assets 4,541 3,356 1,139 46 Derivative liabilities (33 ) — (33 ) — Net assets $ 4,508 $ 3,356 $ 1,106 $ 46 December 31, 2019 (in millions) Total Fair Value Level 1 Level 2 Not Categorized NDTF cash and cash equivalents $ 21 $ 21 $ — $ — NDTF equity securities 3,154 3,103 — 51 NDTF debt securities 1,172 206 966 — Total assets 4,347 3,330 966 51 Derivative liabilities (49 ) — (49 ) — Net assets $ 4,298 $ 3,330 $ 917 $ 51
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 tables provide recorded balances for assets and liabilities measured at fair value on a recurring basis on the Condensed Consolidated Balance Sheets. September 30, 2020 December 31, 2019 (in millions) Total Fair Value Level 1 Level 2 Total Fair Value Level 1 Level 2 NDTF cash and cash equivalents $ 645 $ 645 $ — $ 80 $ 80 $ — NDTF equity securities 2,230 2,230 — 2,530 2,530 — NDTF debt securities 992 232 760 1,196 519 677 Other debt securities 53 — 53 51 — 51 Other cash and cash equivalents 107 107 — 49 49 — Derivative assets 33 — 33 7 — 7 Total assets 4,060 3,214 846 3,913 3,178 735 NDTF equity security contracts — — — (23 ) — (23 ) Derivative liabilities (36 ) — (36 ) (65 ) — (65 ) Net assets $ 4,024 $ 3,214 $ 810 $ 3,825 $ 3,178 $ 647
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 tables provide recorded balances for assets and liabilities measured at fair value on a recurring basis on the Condensed Consolidated Balance Sheets. September 30, 2020 December 31, 2019 (in millions) Total Fair Value Level 1 Level 2 Total Fair Value Level 1 Level 2 NTDF cash and cash equivalents $ 57 $ 57 $ — $ 53 $ 53 $ — NDTF equity securities 2,150 2,150 — 2,077 2,077 — NDTF debt securities 992 232 760 921 244 677 Other cash and cash equivalents 1 1 — 2 2 — Derivative assets 33 — 33 — — — Total assets 3,233 2,440 793 3,053 2,376 677 Derivative liabilities (20 ) — (20 ) (49 ) — (49 ) Net assets $ 3,213 $ 2,440 $ 773 $ 3,004 $ 2,376 $ 628
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 tables provide recorded balances for assets and liabilities measured at fair value on a recurring basis on the Condensed Consolidated Balance Sheets. September 30, 2020 December 31, 2019 (in millions) Total Fair Value Level 1 Level 2 Total Fair Value Level 1 Level 2 NDTF cash and cash equivalents $ 588 $ 588 $ — $ 27 $ 27 $ — NDTF equity securities 80 80 — 453 453 — NDTF debt securities — — — 275 275 — Other debt securities 53 — 53 51 — 51 Other cash and cash equivalents 2 2 — 4 4 — Derivative assets — — — 7 — 7 Total assets 723 670 53 817 759 58 NDTF equity security contracts — — — (23 ) — (23 ) Derivative liabilities — — — (1 ) — (1 ) Net assets $ 723 $ 670 $ 53 $ 793 $ 759 $ 34
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 tables provide recorded balances for assets and liabilities measured at fair value on a recurring basis on the Condensed Consolidated Balance Sheets. September 30, 2020 December 31, 2019 (in millions) Total Fair Value Level 1 Level 2 Level 3 Total Fair Value Level 1 Level 2 Level 3 Other equity securities $ 84 $ 84 $ — $ — $ 81 $ 81 $ — $ — Other debt securities 45 — 45 — 44 — 44 — Other cash and cash equivalents 1 1 — — — — — — Derivative assets 8 — — 8 13 2 — 11 Total assets $ 138 $ 85 $ 45 $ 8 $ 138 $ 83 $ 44 $ 11 Derivative liabilities — — — — (1 ) (1 ) — — Net assets $ 138 $ 85 $ 45 $ 8 $ 137 $ 82 $ 44 $ 11
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) Three Months Ended September 30, Nine Months Ended September 30, (in millions) 2020 2019 2020 2019 Balance at beginning of period $ 10 $ 28 $ 11 $ 22 Purchases, sales, issuances and settlements: Purchases — — 10 29 Settlements (3 ) (7 ) (13 ) (26 ) Total gains (losses) included on the Condensed Consolidated Balance Sheet 1 (5 ) — (9 ) Balance at end of period $ 8 $ 16 $ 8 $ 16
Piedmont Natural Gas
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 Condensed Consolidated Balance Sheets. September 30, 2020 December 31, 2019 (in millions) Total Fair Value Level 1 Level 3 Total Fair Value Level 1 Level 3 Derivative assets $ 6 $ 6 $ — $ 1 $ 1 $ — Derivative liabilities (111 ) — (111 ) (117 ) — (117 ) Net (liabilities) assets $ (105 ) $ 6 $ (111 ) $ (116 ) $ 1 $ (117 )
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) Three Months Ended September 30, Nine Months Ended September 30, (in millions) 2020 2019 2020 2019 Balance at beginning of period $ (105 ) $ (114 ) $ (117 ) $ (141 ) Total (losses) gains and settlements (6 ) 3 6 30 Balance at end of period $ (111 ) $ (111 ) $ (111 ) $ (111 )

Variable Interest Entities (Tab

Variable Interest Entities (Tables)	9 Months Ended
	Sep. 30, 2020
VIE primary beneficiary
Variable Interest Entities [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 December 2022 April 2023 April 2021 Credit facility amount $ 350 $ 475 $ 350 $ 250 Amounts borrowed at September 30, 2020 350 475 350 250 Amounts borrowed at December 31, 2019 350 474 325 250 Restricted Receivables at September 30, 2020 479 770 559 506 Restricted Receivables at December 31, 2019 522 642 489 336
VIE not primary beneficiary
Variable Interest Entities [Line Items]
Schedule Of Variable Interest Entities	The following tables summarize the impact of non-consolidated VIEs on the Condensed Consolidated Balance Sheets. September 30, 2020 Duke Energy Duke Duke Pipeline Commercial Other Energy Energy (in millions) Investments Renewables VIEs Total Ohio Indiana Receivables from affiliated companies $ — $ (1 ) $ — $ (1 ) $ 45 $ 74 Other current assets 413 — — 413 — $ — Investments in equity method unconsolidated affiliates — 487 1 488 — — Deferred tax asset 26 — — 26 — — Total assets $ 439 $ 486 $ 1 $ 926 $ 45 $ 74 Other current liabilities 927 — 3 930 — — Other noncurrent liabilities 19 — 10 29 — — Total liabilities $ 946 $ — $ 13 $ 959 $ — $ — Net (liabilities) assets $ (507 ) $ 486 $ (12 ) $ (33 ) $ 45 $ 74 December 31, 2019 Duke Energy Duke Duke Pipeline Commercial Other Energy Energy (in millions) Investments Renewables VIEs Total Ohio Indiana Receivables from affiliated companies $ — $ (1 ) $ — $ (1 ) $ 64 $ 77 Investments in equity method unconsolidated affiliates 1,179 300 — 1,479 — — Total assets $ 1,179 $ 299 $ — $ 1,478 $ 64 $ 77 Taxes accrued (1 ) — — (1 ) — — Other current liabilities — — 4 4 — — Deferred income taxes 59 — — 59 — — Other noncurrent liabilities — — 11 11 — — Total liabilities $ 58 $ — $ 15 $ 73 $ — $ — Net assets (liabilities) $ 1,121 $ 299 $ (15 ) $ 1,405 $ 64 $ 77
DEFPF | VIE primary beneficiary
Variable Interest Entities [Line Items]
Schedule Of Variable Interest Entities	The following table summarizes the impact of DEFPF on Duke Energy Florida's Condensed Consolidated Balance Sheets. (in millions) September 30, 2020 December 31, 2019 Receivables of VIEs $ 6 $ 5 Regulatory Assets: Current 53 52 Current Assets: Other 16 39 Other Noncurrent Assets: Regulatory assets 951 989 Current Liabilities: Other 2 10 Current maturities of long-term debt 55 54 Long-Term Debt 1,001 1,057
Commercial Renewables | VIE primary beneficiary
Variable Interest Entities [Line Items]
Schedule Of Variable Interest Entities	The table below presents material balances reported on Duke Energy's Condensed Consolidated Balance Sheets related to Commercial Renewables VIEs. (in millions) September 30, 2020 December 31, 2019 Current Assets: Other $ 319 $ 203 Property, Plant and Equipment: Cost 6,239 5,747 Accumulated depreciation and amortization (1,200 ) (1,041 ) Other Noncurrent Assets: Other 79 106 Current maturities of long-term debt 161 162 Long-Term Debt 1,452 1,541 Other Noncurrent Liabilities: AROs 150 127 Other Noncurrent Liabilities: Other 342 228
Pipeline Investments | VIE not primary beneficiary
Variable Interest Entities [Line Items]
Schedule Of Variable Interest Entities	For the three and nine months ended September 30, 2020 , the ACP investment is considered a significant subsidiary because its income (loss) exceeds 10% of Duke Energy’s income (loss). The table below presents unaudited summarized financial information for ACP. Three Months Ended September 30, Nine Months Ended September 30, (in millions) 2020 2019 2020 2019 Net (Loss) Income $ (163 ) $ 65 $ (4,505 ) $ 178 The table below presents Duke Energy's ownership interest and investment balances in these joint ventures. VIE Investment Amount (in millions) Ownership September 30, December 31, Entity Name Interest 2020 2019 ACP (a) 47 % $ (927 ) $ 1,179 Constitution (b) 24 % — — Total $ (927 ) $ 1,179 (a) During the quarter ended June 30, 2020, Duke Energy determined that it would no longer continue its investment in ACP as described above. The current liability related to the cancellation of the ACP pipeline project represents Duke Energy's continuing obligation to fund its share of ACP's obligations. See Notes 1, 3 and 4 for more information. (b) During the year ended December 31, 2019, Duke Energy recorded an other-than-temporary impairment related to Constitution. This charge resulted in the full write-down of Duke Energy's investment in Constitution.
CRC | VIE not primary beneficiary
Variable Interest Entities [Line Items]
Schedule Of Variable Interest Entities	The following table shows the gross and net receivables sold. Duke Energy Ohio Duke Energy Indiana (in millions) September 30, 2020 December 31, 2019 September 30, 2020 December 31, 2019 Receivables sold $ 226 $ 253 $ 310 $ 307 Less: Retained interests 45 64 74 77 Net receivables sold $ 181 $ 189 $ 236 $ 230 The following table shows sales and cash flows related to receivables sold. Duke Energy Ohio Duke Energy Indiana Three Months Ended Nine Months Ended Three Months Ended Nine Months Ended September 30, September 30, September 30, September 30, (in millions) 2020 2019 2020 2019 2020 2019 2020 2019 Sales Receivables sold $ 462 $ 479 $ 1,428 $ 1,483 $ 717 $ 762 $ 1,947 $ 2,172 Loss recognized on sale 2 4 8 11 3 4 9 13 Cash flows Cash proceeds from receivables sold $ 449 $ 471 $ 1,439 $ 1,516 $ 689 $ 762 $ 1,941 $ 2,200 Collection fees received 1 — 1 1 — — 1 1 Return received on retained interests 1 1 3 5 1 2 4 7

Revenue (Tables)

Revenue (Tables)	9 Months Ended
	Sep. 30, 2020
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) 2020 2021 2022 2023 2024 Thereafter Total Progress Energy $ 30 $ 92 $ 94 $ 44 $ 45 $ 58 $ 363 Duke Energy Progress 2 8 8 8 8 — 34 Duke Energy Florida 28 84 86 36 37 58 329 Duke Energy Indiana 2 5 — 7 12 36 62 Remaining Performance Obligations (in millions) 2020 2021 2022 2023 2024 Thereafter Total Piedmont $ 17 $ 65 $ 64 $ 61 $ 58 $ 377 $ 642
Disaggregation of Revenue	Disaggregated revenues are presented as follows: Three Months Ended September 30, 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 $ 2,936 $ 883 $ 1,550 $ 616 $ 934 $ 213 $ 289 $ — General 1,804 664 805 384 421 119 212 — Industrial 797 342 245 179 66 35 175 — Wholesale 603 117 412 358 54 10 64 — Other revenues 238 62 167 75 92 23 22 — Total Electric Utilities and Infrastructure revenue from contracts with customers $ 6,378 $ 2,068 $ 3,179 $ 1,612 $ 1,567 $ 400 $ 762 $ — Gas Utilities and Infrastructure Residential $ 112 $ — $ — $ — $ — $ 55 $ — $ 57 Commercial 64 — — — — 20 — 44 Industrial 24 — — — — 3 — 22 Power Generation — — — — — — — 10 Other revenues 16 — — — — 3 — 11 Total Gas Utilities and Infrastructure revenue from contracts with customers $ 216 $ — $ — $ — $ — $ 81 $ — $ 144 Commercial Renewables Revenue from contracts with customers $ 57 $ — $ — $ — $ — $ — $ — $ — Other Revenue from contracts with customers $ 7 $ — $ — $ — $ — $ — $ — $ — Total revenue from contracts with customers $ 6,658 $ 2,068 $ 3,179 $ 1,612 $ 1,567 $ 481 $ 762 $ 144 Other revenue sources (a) $ 63 $ (10 ) $ 18 $ 14 $ — $ (8 ) $ (1 ) $ 18 Total revenues $ 6,721 $ 2,058 $ 3,197 $ 1,626 $ 1,567 $ 473 $ 761 $ 162 (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. Three Months Ended September 30, 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 $ 2,923 $ 892 $ 1,522 $ 625 $ 897 $ 215 $ 294 $ — General 1,885 687 843 399 444 127 225 — Industrial 869 372 255 189 66 40 204 — Wholesale 617 113 429 368 61 13 63 — Other revenues 198 76 118 70 48 18 22 — Total Electric Utilities and Infrastructure revenue from contracts with customers $ 6,492 $ 2,140 $ 3,167 $ 1,651 $ 1,516 $ 413 $ 808 $ — Gas Utilities and Infrastructure Residential $ 113 $ — $ — $ — $ — $ 53 $ — $ 59 Commercial 68 — — — — 21 — 47 Industrial 26 — — — — 4 — 25 Power Generation — — — — — — — 13 Other revenues 16 — — — — 3 — 13 Total Gas Utilities and Infrastructure revenue from contracts with customers $ 223 $ — $ — $ — $ — $ 81 $ — $ 157 Commercial Renewables Revenue from contracts with customers $ 69 $ — $ — $ — $ — $ — $ — $ — Other Revenue from contracts with customers $ 8 $ — $ — $ — $ — $ — $ — $ — Total revenue from contracts with customers $ 6,792 $ 2,140 $ 3,167 $ 1,651 $ 1,516 $ 494 $ 808 $ 157 Other revenue sources (a) $ 148 $ 22 $ 75 $ 37 $ 32 $ (5 ) $ (1 ) $ 11 Total revenues $ 6,940 $ 2,162 $ 3,242 $ 1,688 $ 1,548 $ 489 $ 807 $ 168 (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. Nine Months Ended September 30, 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 $ 7,451 $ 2,316 $ 3,792 $ 1,578 $ 2,214 $ 558 $ 785 $ — General 4,691 1,720 2,080 1,001 1,079 336 554 — Industrial 2,148 871 673 487 186 103 502 — Wholesale 1,535 332 1,018 877 141 22 163 — Other revenues 713 184 476 208 268 62 63 — Total Electric Utilities and Infrastructure revenue from contracts with customers $ 16,538 $ 5,423 $ 8,039 $ 4,151 $ 3,888 $ 1,081 $ 2,067 $ — Gas Utilities and Infrastructure Residential $ 631 $ — $ — $ — $ — $ 214 $ — $ 417 Commercial 308 — — — — 86 — 222 Industrial 92 — — — — 12 — 80 Power Generation — — — — — — — 27 Other revenues 58 — — — — 12 — 46 Total Gas Utilities and Infrastructure revenue from contracts with customers $ 1,089 $ — $ — $ — $ — $ 324 $ — $ 792 Commercial Renewables Revenue from contracts with customers $ 170 $ — $ — $ — $ — $ — $ — $ — Other Revenue from contracts with customers $ 20 $ — $ — $ — $ — $ — $ — $ — Total Revenue from contracts with customers $ 17,817 $ 5,423 $ 8,039 $ 4,151 $ 3,888 $ 1,405 $ 2,067 $ 792 Other revenue sources (a) $ 274 $ (7 ) $ 78 $ 56 $ 9 $ (11 ) $ 3 $ 79 Total revenues $ 18,091 $ 5,416 $ 8,117 $ 4,207 $ 3,897 $ 1,394 $ 2,070 $ 871 (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. Nine Months Ended September 30, 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 $ 7,597 $ 2,331 $ 3,879 $ 1,657 $ 2,222 $ 563 $ 825 $ — General 4,896 1,714 2,225 1,044 1,181 335 619 — Industrial 2,339 927 708 514 194 109 595 — Wholesale 1,685 341 1,133 992 141 36 176 — Other revenues 557 222 389 239 150 59 66 — Total Electric Utilities and Infrastructure revenue from contracts with customers $ 17,074 $ 5,535 $ 8,334 $ 4,446 $ 3,888 $ 1,102 $ 2,281 $ — Gas Utilities and Infrastructure Residential $ 673 $ — $ — $ — $ — $ 229 $ — $ 443 Commercial 359 — — — — 96 — 263 Industrial 103 — — — — 14 — 91 Power Generation — — — — — — — 39 Other revenues 101 — — — — 13 — 88 Total Gas Utilities and Infrastructure revenue from contracts with customers $ 1,236 $ — $ — $ — $ — $ 352 $ — $ 924 Commercial Renewables Revenue from contracts with customers $ 157 $ — $ — $ — $ — $ — $ — $ — Other Revenue from contracts with customers $ 18 $ — $ — $ — $ — $ — $ — $ — Total Revenue from contracts with customers $ 18,485 $ 5,535 $ 8,334 $ 4,446 $ 3,888 $ 1,454 $ 2,281 $ 924 Other revenue sources (a) $ 491 $ 84 $ 224 $ 113 $ 99 $ (1 ) $ 8 $ 32 Total revenues $ 18,976 $ 5,619 $ 8,558 $ 4,559 $ 3,987 $ 1,453 $ 2,289 $ 956 (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.
Reserve for Credit Losses for Trade and Other Receivables	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. Three Months Ended September 30, 2020 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Balance at June 30, 2020 $ 102 $ 14 $ 29 $ 14 $ 14 $ 5 $ 3 $ 6 Write-Offs 12 (2 ) 15 13 2 — — — Credit Loss Expense (9 ) — (16 ) (15 ) — — — 3 Other Adjustments 28 10 9 9 — — — — Balance at September 30, 2020 $ 133 $ 22 $ 37 $ 21 $ 16 $ 5 $ 3 $ 9 Nine Months Ended September 30, 2020 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 (7 ) (8 ) 8 8 — — — (5 ) Credit Loss Expense 24 9 2 (5 ) 8 1 — 7 Other Adjustments 35 10 9 9 — — — — Balance at September 30, 2020 $ 133 $ 22 $ 37 $ 21 $ 16 $ 5 $ 3 $ 9
Aging of Trade Receivables	These receivables for unbilled revenues are shown in the table below. (in millions) September 30, 2020 December 31, 2019 Duke Energy Ohio $ 66 $ 82 Duke Energy Indiana 106 115 The aging of trade receivables is presented in the table below. Duke Energy considers receivables greater than 30 days outstanding past due. September 30, 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 $ 788 $ 284 $ 274 $ 139 $ 135 $ 1 $ 16 $ 5 0-30 days 1,800 475 847 439 406 44 23 66 30-60 days 227 86 84 48 36 7 2 8 60-90 days 94 39 31 20 11 3 1 3 90+ days 263 85 68 37 31 40 9 20 Trade and Other Receivables $ 3,172 $ 969 $ 1,304 $ 683 $ 619 $ 95 $ 51 $ 102 Unbilled revenues are included within Receivables and Receivables of VIEs on the Condensed Consolidated Balance Sheets as shown in the following table. (in millions) September 30, 2020 December 31, 2019 Duke Energy $ 788 $ 843 Duke Energy Carolinas 284 298 Progress Energy 274 217 Duke Energy Progress 139 122 Duke Energy Florida 135 95 Duke Energy Ohio 1 1 Duke Energy Indiana 16 16 Piedmont 5 78

Stockholders' Equity (Tables)

Stockholders' Equity (Tables)	9 Months Ended
	Sep. 30, 2020
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. Three Months Ended September 30, Nine Months Ended September 30, (in millions, except per share amounts) 2020 2019 2020 2019 Net income available to Duke Energy common stockholders $ 1,265 $ 1,327 $ 1,347 $ 3,047 Accumulated preferred stock dividends adjustment 12 (2 ) 13 (2 ) Less: Impact of participating securities 1 1 2 4 Income from continuing operations available to Duke Energy common stockholders $ 1,276 $ 1,324 $ 1,358 $ 3,041 Weighted average common shares outstanding – basic 735 729 735 728 Equity forwards — — — — Weighted average common shares outstanding – diluted 735 729 735 728 EPS available to Duke Energy common stockholders Basic and diluted $ 1.74 $ 1.82 $ 1.85 $ 4.18 Potentially dilutive items excluded from the calculation (a) 2 2 2 2 Dividends declared per common share $ 0.965 $ 0.945 $ 2.855 $ 2.800 Dividends declared on Series A preferred stock per depositary share (b) $ 0.359 $ 0.359 $ 1.078 $ 0.667 Dividends declared on Series B preferred stock per share (c) $ 24.375 $ — $ 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. (b) 5.75% Series A Cumulative Redeemable Perpetual Preferred Stock dividends are payable quarterly in arrears on the 16th day of March, June, September and December. The preferred stock has a $25 liquidation preference per depositary share. (c) 4.875% Series B Fixed-Rate Reset Cumulative Redeemable Perpetual Preferred Stock dividends are payable semiannually in arrears on the 16th day of March and September. The preferred stock has a $1,000 liquidation preference per share.

Employee Benefit Plans (Tables)

Employee Benefit Plans (Tables)	9 Months Ended
	Sep. 30, 2020
Qualified Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Components of Net Periodic Pension Costs	The following tables include the components of net periodic pension costs for qualified pension plans. Three Months Ended September 30, 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 $ 41 $ 12 $ 12 $ 6 $ 5 $ 1 $ 2 $ 1 Interest cost on projected benefit obligation 67 16 21 10 12 4 6 2 Expected return on plan assets (143 ) (36 ) (48 ) (22 ) (25 ) (7 ) (11 ) (5 ) Amortization of actuarial loss 32 7 10 4 6 2 3 2 Amortization of prior service credit (8 ) (2 ) — — — — — (2 ) Amortization of settlement charges 11 6 5 5 1 — 1 1 Net periodic pension costs $ — $ 3 $ — $ 3 $ (1 ) $ — $ 1 $ (1 ) Three Months Ended September 30, 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 $ 42 $ 13 $ 13 $ 7 $ 5 $ 1 $ 2 $ 1 Interest cost on projected benefit obligation 77 17 24 10 14 5 6 2 Expected return on plan assets (140 ) (36 ) (45 ) (22 ) (22 ) (7 ) (11 ) (5 ) Amortization of actuarial loss 28 6 10 4 6 2 3 2 Amortization of prior service credit (8 ) (2 ) (1 ) — — — — (2 ) Net periodic pension costs $ (1 ) $ (2 ) $ 1 $ (1 ) $ 3 $ 1 $ — $ (2 ) Nine Months Ended September 30, 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 $ 124 $ 38 $ 36 $ 20 $ 16 $ 3 $ 6 $ 4 Interest cost on projected benefit obligation 202 47 64 29 35 12 17 7 Expected return on plan assets (429 ) (108 ) (143 ) (66 ) (76 ) (21 ) (32 ) (16 ) Amortization of actuarial loss 96 21 30 13 17 5 9 7 Amortization of prior service credit (24 ) (6 ) (2 ) (1 ) (1 ) — (1 ) (7 ) Amortization of settlement charges 16 8 6 6 1 — 1 1 Net periodic pension costs $ (15 ) $ — $ (9 ) $ 1 $ (8 ) $ (1 ) $ — $ (4 ) Nine Months Ended September 30, 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 $ 116 $ 37 $ 34 $ 19 $ 15 $ 3 $ 6 $ 4 Interest cost on projected benefit obligation 242 58 76 34 41 14 19 8 Expected return on plan assets (426 ) (111 ) (134 ) (66 ) (66 ) (21 ) (32 ) (16 ) Amortization of actuarial loss 77 17 28 10 18 3 6 5 Amortization of prior service credit (24 ) (6 ) (2 ) (1 ) (1 ) — (1 ) (7 ) Net periodic pension costs $ (15 ) $ (5 ) $ 2 $ (4 ) $ 7 $ (1 ) $ (2 ) $ (6 )

Income Taxes (Tables)

Income Taxes (Tables)	9 Months Ended
	Sep. 30, 2020
Income Tax Disclosure [Abstract]
Summary of Effective Tax Rates	The ETRs from continuing operations for each of the Duke Energy Registrants are included in the following table. Three Months Ended Nine Months Ended September 30, September 30, 2020 2019 2020 2019 Duke Energy 7.8 % 12.4 % (6.4 )% 12.5 % Duke Energy Carolinas 12.0 % 16.7 % 13.6 % 17.7 % Progress Energy 10.4 % 15.3 % 13.4 % 16.2 % Duke Energy Progress 3.1 % 14.7 % 10.0 % 16.1 % Duke Energy Florida 21.4 % 16.5 % 20.3 % 18.0 % Duke Energy Ohio 16.7 % 12.9 % 16.6 % 15.2 % Duke Energy Indiana 19.6 % 23.2 % 19.4 % 23.7 % Piedmont 16.7 % 35.7 % 3.7 % 18.5 %

Organization and Basis of Pre_4

Organization and Basis of Presentation (Narrative) (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Noncontrolling Interest [Line Items]
Incurred costs	$ 1,450,000,000	$ 1,484,000,000	$ 4,142,000,000	$ 4,337,000,000
Current Liabilities: Other	2,829,000,000		2,829,000,000		$ 2,367,000,000
ACP
Noncontrolling Interest [Line Items]
Current Liabilities: Other	935,000,000		935,000,000		0
Piedmont Natural Gas
Noncontrolling Interest [Line Items]
Incurred costs	75,000,000	$ 78,000,000	234,000,000	$ 241,000,000
Current Liabilities: Other	59,000,000		59,000,000		67,000,000
Piedmont Natural Gas | Other
Noncontrolling Interest [Line Items]
Prepaid assets	23,000,000		23,000,000		$ 3,000,000
Incremental COVID-19 costs
Noncontrolling Interest [Line Items]
Incurred costs	39,000,000		91,000,000
Deferred costs	56,000,000		56,000,000
Waived late payment fees	$ 29,000,000		$ 54,000,000

Organization and Basis of Pre_5

Organization and Basis of Presentation (Schedule of Cash Received and Allocated Losses from Subsidiaries, Noncontrolling Interest) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Cash received for the sale of noncontrolling interest to tax equity members	$ 239	$ 7	$ 402	$ 200
Cash received for the sale of noncontrolling interest to pro rata share members	0	0	0	415
Total Noncontrolling Interest Capital Contributions	239	7	402	615
Allocated losses to noncontrolling tax equity members utilizing the HLBV method	59	15	187	105
Allocated losses to noncontrolling members based on pro rata shares of ownership	11	4	21	5
Total Noncontrolling Interest Allocated Losses	$ 70	$ 19	$ 208	$ 110

Organization and Basis of Pre_6

Organization and Basis of Presentation (Schedule of Cash and Cash Equivalents) (Details) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019	Sep. 30, 2019	Dec. 31, 2018
Current Assets
Cash and cash equivalents	$ 308	$ 311
Other	187	222
Other Noncurrent Assets
Other	105	40
Total cash, cash equivalents and restricted cash	600	573	$ 582	$ 591
Progress Energy
Current Assets
Cash and cash equivalents	70	48
Other	16	39
Other Noncurrent Assets
Other	102	39
Total cash, cash equivalents and restricted cash	188	126	136	112
Duke Energy Florida
Current Assets
Cash and cash equivalents	19	17
Other	16	39
Other Noncurrent Assets
Total cash, cash equivalents and restricted cash	$ 35	$ 56	$ 40	$ 75

Organization and Basis of Pre_7

Organization and Basis of Presentation (Schedule of Inventory) (Details) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Public Utilities, Inventory [Line Items]
Inventory	$ 3,190	$ 3,232
Materials and supplies
Public Utilities, Inventory [Line Items]
Inventory	2,341	2,297
Coal
Public Utilities, Inventory [Line Items]
Inventory	546	586
Natural gas, oil and other fuel
Public Utilities, Inventory [Line Items]
Inventory	303	349
Duke Energy Carolinas
Public Utilities, Inventory [Line Items]
Inventory	992	996
Duke Energy Carolinas | Materials and supplies
Public Utilities, Inventory [Line Items]
Inventory	779	768
Duke Energy Carolinas | Coal
Public Utilities, Inventory [Line Items]
Inventory	173	187
Duke Energy Carolinas | Natural gas, oil and other fuel
Public Utilities, Inventory [Line Items]
Inventory	40	41
Progress Energy
Public Utilities, Inventory [Line Items]
Inventory	1,378	1,423
Progress Energy | Materials and supplies
Public Utilities, Inventory [Line Items]
Inventory	1,021	1,038
Progress Energy | Coal
Public Utilities, Inventory [Line Items]
Inventory	168	186
Progress Energy | Natural gas, oil and other fuel
Public Utilities, Inventory [Line Items]
Inventory	189	199
Duke Energy Progress
Public Utilities, Inventory [Line Items]
Inventory	910	934
Duke Energy Progress | Materials and supplies
Public Utilities, Inventory [Line Items]
Inventory	682	686
Duke Energy Progress | Coal
Public Utilities, Inventory [Line Items]
Inventory	120	138
Duke Energy Progress | Natural gas, oil and other fuel
Public Utilities, Inventory [Line Items]
Inventory	108	110
Duke Energy Florida
Public Utilities, Inventory [Line Items]
Inventory	468	489
Duke Energy Florida | Materials and supplies
Public Utilities, Inventory [Line Items]
Inventory	340	351
Duke Energy Florida | Coal
Public Utilities, Inventory [Line Items]
Inventory	48	48
Duke Energy Florida | Natural gas, oil and other fuel
Public Utilities, Inventory [Line Items]
Inventory	80	90
Duke Energy Ohio
Public Utilities, Inventory [Line Items]
Inventory	130	135
Duke Energy Ohio | Materials and supplies
Public Utilities, Inventory [Line Items]
Inventory	79	79
Duke Energy Ohio | Coal
Public Utilities, Inventory [Line Items]
Inventory	12	15
Duke Energy Ohio | Natural gas, oil and other fuel
Public Utilities, Inventory [Line Items]
Inventory	39	41
Duke Energy Indiana
Public Utilities, Inventory [Line Items]
Inventory	507	517
Duke Energy Indiana | Materials and supplies
Public Utilities, Inventory [Line Items]
Inventory	314	318
Duke Energy Indiana | Coal
Public Utilities, Inventory [Line Items]
Inventory	192	198
Duke Energy Indiana | Natural gas, oil and other fuel
Public Utilities, Inventory [Line Items]
Inventory	1	1
Piedmont Natural Gas
Public Utilities, Inventory [Line Items]
Inventory	47	72
Piedmont Natural Gas | Materials and supplies
Public Utilities, Inventory [Line Items]
Inventory	13	5
Piedmont Natural Gas | Natural gas, oil and other fuel
Public Utilities, Inventory [Line Items]
Inventory	$ 34	$ 67

Organization and Basis of Pre_8

Organization and Basis of Presentation (Schedule of New Accounting Pronouncements) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Sep. 30, 2020	Jun. 30, 2020	Sep. 30, 2019	Jun. 30, 2019	Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total pretax impact to Retained Earnings	$ 47,951	$ 47,295	$ 46,611	$ 47,407	$ 45,332	$ 43,834
Accounting Standards Update [Extensible List]	us-gaap:AccountingStandardsUpdate201613Member
Progress Energy
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total pretax impact to Retained Earnings	$ 15,593	16,429	16,221	15,363	14,839	14,257
Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total pretax impact to Retained Earnings	4,108	3,260	2,707	4,139	3,502	3,113
Retained Earnings | Progress Energy
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total pretax impact to Retained Earnings	6,465	$ 7,296	$ 7,090	$ 6,236	$ 5,715	$ 5,131
Cumulative Change in Accounting Principle | Retained Earnings | Revision of Prior Period, Accounting Standards Update, Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total pretax impact to Retained Earnings	120
Cumulative Change in Accounting Principle | Retained Earnings | Revision of Prior Period, Accounting Standards Update, Adjustment | Duke Energy Carolinas
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total pretax impact to Retained Earnings	16
Cumulative Change in Accounting Principle | Retained Earnings | Revision of Prior Period, Accounting Standards Update, Adjustment | Progress Energy
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total pretax impact to Retained Earnings	2
Cumulative Change in Accounting Principle | Retained Earnings | Revision of Prior Period, Accounting Standards Update, Adjustment | Duke Energy Progress
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total pretax impact to Retained Earnings	1
Cumulative Change in Accounting Principle | Retained Earnings | Revision of Prior Period, Accounting Standards Update, Adjustment | Duke Energy Florida
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total pretax impact to Retained Earnings	1
Cumulative Change in Accounting Principle | Retained Earnings | Revision of Prior Period, Accounting Standards Update, Adjustment | Piedmont Natural Gas
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total pretax impact to Retained Earnings	$ 1

Business Segments (Narrative) (

Business Segments (Narrative) (Details) $ in Millions	9 Months Ended
	Sep. 30, 2020USD ($)segment
Duke Energy Ohio
Segment Reporting Information [Line Items]
Number of reportable segments | segment	2
Wind and solar | Nonregulated
Segment Reporting Information [Line Items]
Renewable merchant plants | $	$ 150
Joint owner ownership percentage	51.00%

Business Segments (Business Seg

Business Segments (Business Segment Data) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Segment Reporting Information [Line Items]
Operating revenues	$ 6,721	$ 6,940	$ 18,091	$ 18,976
Segment income (loss)	1,265	1,327	1,347	3,047
Less: Noncontrolling interests	(70)	(19)	(208)	(110)
Add: Preferred stock dividend	39	15	93	27
Net Income	1,234	1,323	1,232	2,964
Segment assets	161,409		161,409		$ 158,838
Impairment charges	28	(20)	36	(16)
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	1,339	1,511	1,158	3,388
Equity in losses (earnings) of unconsolidated affiliates	80	(50)	2,004	(137)
Electric Utilities and Infrastructure
Segment Reporting Information [Line Items]
Operating revenues	6,371	6,569	16,571	17,357
Gas Utilities and Infrastructure
Segment Reporting Information [Line Items]
Operating revenues	217	225	1,122	1,239
Commercial Renewables
Segment Reporting Information [Line Items]
Operating revenues	126	138	378	362
Total Reportable Segments
Segment Reporting Information [Line Items]
Operating revenues	6,714	6,932	18,071	18,958
Other
Segment Reporting Information [Line Items]
Operating revenues	7	8	20	18
Operating Segments | Electric Utilities and Infrastructure
Segment Reporting Information [Line Items]
Operating revenues	6,379	6,577	16,596	17,381
Segment income (loss)	1,381	1,385	2,839	2,944
Segment assets	138,142		138,142
Operating Segments | Gas Utilities and Infrastructure
Segment Reporting Information [Line Items]
Operating revenues	241	249	1,194	1,311
Segment income (loss)	(73)	26	(1,400)	292
Segment assets	13,343		13,343
Equity in losses (earnings) of unconsolidated affiliates	(78)		(2,100)
Operating Segments | Commercial Renewables
Segment Reporting Information [Line Items]
Operating revenues	126	138	378	362
Segment income (loss)	60	40	207	139
Segment assets	6,541		6,541
Operating Segments | Total Reportable Segments
Segment Reporting Information [Line Items]
Operating revenues	6,746	6,964	18,168	19,054
Segment income (loss)	1,368	1,451	1,646	3,375
Segment assets	158,026		158,026
Other
Segment Reporting Information [Line Items]
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest			98
Other | Other
Segment Reporting Information [Line Items]
Operating revenues	24	25	73	71
Segment income (loss)	(103)	(124)	(299)	(328)
Segment assets	3,387		3,387
Eliminations
Segment Reporting Information [Line Items]
Operating revenues	(49)	(49)	(150)	(149)
Segment assets	(4)		(4)
Eliminations | Electric Utilities and Infrastructure
Segment Reporting Information [Line Items]
Operating revenues	8	8	25	24
Eliminations | Gas Utilities and Infrastructure
Segment Reporting Information [Line Items]
Operating revenues	24	24	72	72
Eliminations | Total Reportable Segments
Segment Reporting Information [Line Items]
Operating revenues	32	32	97	96
Eliminations | Other
Segment Reporting Information [Line Items]
Operating revenues	17	17	53	53
Duke Energy Carolinas
Segment Reporting Information [Line Items]
Operating revenues	2,058	2,162	5,416	5,619
Segment assets	45,048		45,048		44,053
Impairment charges	20	6	22	11
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	631	708	1,306	1,439
Duke Energy Ohio
Segment Reporting Information [Line Items]
Operating revenues	473	489	1,394	1,453
Segment income (loss)	70	74	201	190
Segment assets	9,749		9,749		9,338
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	84	85	241	224
Duke Energy Ohio | Operating Segments | Electric Utilities and Infrastructure
Segment Reporting Information [Line Items]
Operating revenues	394	408	1,070	1,099
Segment income (loss)	63	62	137	129
Segment assets	6,448		6,448
Duke Energy Ohio | Operating Segments | Gas Utilities and Infrastructure
Segment Reporting Information [Line Items]
Operating revenues	79	81	324	354
Segment income (loss)	9	13	68	65
Segment assets	3,297		3,297
Duke Energy Ohio | Operating Segments | Total Reportable Segments
Segment Reporting Information [Line Items]
Operating revenues	473	489	1,394	1,453
Segment income (loss)	72	75	205	194
Segment assets	9,745		9,745
Duke Energy Ohio | Other | Other
Segment Reporting Information [Line Items]
Segment income (loss)	(2)	(1)	(4)	(4)
Segment assets	27		27
Duke Energy Ohio | Eliminations
Segment Reporting Information [Line Items]
Segment assets	(23)		(23)
Duke Energy Progress
Segment Reporting Information [Line Items]
Operating revenues	1,626	1,688	4,207	4,559
Segment assets	33,861		33,861		33,377
Impairment charges	5		5
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	357	326	790	775
Piedmont Natural Gas
Segment Reporting Information [Line Items]
Operating revenues	162	168	871	956
Segment assets	8,212		8,212		7,756
Impairment charges	7		7
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	(30)	(28)	161	119
Equity in losses (earnings) of unconsolidated affiliates			(7)	(6)
Duke Energy Florida
Segment Reporting Information [Line Items]
Operating revenues	1,567	1,548	3,897	3,987
Segment assets	20,815		20,815		$ 20,454
Impairment charges	(4)	(25)	(4)	(25)
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	365	346	782	715
ACP | ACP
Segment Reporting Information [Line Items]
Equity in losses (earnings) of unconsolidated affiliates			2,100
ACP | Piedmont Natural Gas | ACP
Segment Reporting Information [Line Items]
Impairment charges			(7)
Operations, maintenance and other | Duke Energy Carolinas | Operating Segments | Electric Utilities and Infrastructure
Segment Reporting Information [Line Items]
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	8		8
Operations, maintenance and other | Duke Energy Progress | Operating Segments | Electric Utilities and Infrastructure
Segment Reporting Information [Line Items]
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	8		8
Impairment charges | Duke Energy Carolinas | Operating Segments | Electric Utilities and Infrastructure
Segment Reporting Information [Line Items]
Impairment charges	19		19
Impairment charges | Piedmont Natural Gas | Operating Segments | Gas Utilities and Infrastructure
Segment Reporting Information [Line Items]
Impairment charges	7
Impairment charges | Duke Energy Florida | Operating Segments | Electric Utilities and Infrastructure
Segment Reporting Information [Line Items]
Reduction of prior year impairment				$ 25
Impairment charges | ACP | Duke Energy Progress | Operating Segments | Electric Utilities and Infrastructure
Segment Reporting Information [Line Items]
Impairment charges	$ 5		$ 5
Revision of Prior Period, Adjustment [Member] | Impairment charges | Duke Energy Florida | Operating Segments | Electric Utilities and Infrastructure
Segment Reporting Information [Line Items]
Impairment charges		$ (25)

Regulatory Matters (Regulatory

Regulatory Matters (Regulatory Matters Narrative - Duke Energy Carolinas) (Details) - USD ($) $ in Millions	Oct. 26, 2020	Jul. 31, 2020	Oct. 30, 2019	Sep. 30, 2019	May 21, 2019	Nov. 08, 2018	Feb. 28, 2018	Nov. 22, 2017	Aug. 25, 2017	Jun. 01, 2017
Duke Energy Carolinas | NCUC | 2017 North Carolina Rate Case
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount									$ 647
Requested return on equity, percent							9.90%
Public utilities, requested equity capital structure, percentage							52.00%
Public utilities, requested debt capital structure, percentage							48.00%
Duke Energy Carolinas | NCUC | 2019 North Carolina Rate Case
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount				$ 291
Requested rate increase, percentage				6.00%
Requested rate increase (decrease), gross amount				$ 445
Requested rate increase (decrease), rider reduction				$ 154
Duke Energy Carolinas | NCUC | 2019 North Carolina Rate Case, additional Agreement and Stipulation of Partial Settlement
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amended amount		$ 800
Requested return on equity, percent		9.60%
Public utilities, requested equity capital structure, percentage		52.00%
Public utilities, requested debt capital structure, percentage		48.00%
Regulatory asset, amortization period						5 years
Duke Energy Carolinas | NCUC | Annual revenue requirement
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amended amount		$ 45
Duke Energy Carolinas | NCUC | Annual revenue requirement | Subsequent event
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amended amount	$ 262
Duke Energy Carolinas | PSCSC | South Carolina Rate Case 2018
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount						$ 168
Approved return on equity percentage					9.50%
Public utilities, approved equity capital structure, percentage					53.00%
Public utilities, approved debt capital structure, percentage					47.00%
Change in tax rate, deferred tax liability, income tax benefit					$ 66
Measurement period adjustment, income tax expense (benefit)					$ 45
Duke Energy Carolinas | PSCSC | South Carolina Rate Case 2018 | State and local jurisdiction | North Carolina Department of Revenue
Public Utilities, General Disclosures [Line Items]
Regulatory asset, amortization period					5 years
State and local taxes reduction amount					$ 17
Duke Energy Carolinas | Asset retirement obligations - coal ash | PSCSC | South Carolina Rate Case 2018
Public Utilities, General Disclosures [Line Items]
Regulatory assets					$ 96
Regulatory asset, amortization period					5 years
Recovery costs denied					$ 115
Duke Energy Carolinas | Asset retirement obligations - unprotected EDIT, Property, Plant and Equipment | PSCSC | South Carolina Rate Case 2018
Public Utilities, General Disclosures [Line Items]
Regulatory asset, amortization period					20 years
Duke Energy Carolinas | Asset retirement obligations - unprotected EDIT | PSCSC | South Carolina Rate Case 2018
Public Utilities, General Disclosures [Line Items]
Regulatory asset, amortization period					5 years
Duke Energy Carolinas | Asset retirement obligations - deferred revenue | PSCSC | South Carolina Rate Case 2018
Public Utilities, General Disclosures [Line Items]
Regulatory asset, amortization period					5 years
Duke Energy Carolinas | Deferred project costs | PSCSC | South Carolina Rate Case 2018
Public Utilities, General Disclosures [Line Items]
Regulatory assets					$ 125
Regulatory asset, amortization period					12 years
Duke Energy Progress [Member] | NCUC | 2017 North Carolina Rate Case
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amended amount										$ 420
Requested rate increase (decrease), amount										$ 477
Requested return on equity, percent								9.90%
Public utilities, requested equity capital structure, percentage								52.00%
Public utilities, requested debt capital structure, percentage								48.00%
Duke Energy Progress [Member] | NCUC | 2019 North Carolina Rate Case
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount			$ 464
Requested rate increase, percentage			12.30%
Requested rate increase (decrease), gross amount			$ 586
Requested rate increase (decrease), rider reduction			$ 120
Duke Energy Progress [Member] | NCUC | 2019 North Carolina Rate Case, additional Agreement and Stipulation of Partial Settlement
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amended amount		$ 500
Requested return on equity, percent		9.60%
Public utilities, requested equity capital structure, percentage		52.00%
Public utilities, requested debt capital structure, percentage		48.00%
Regulatory asset, amortization period		5 years
Duke Energy Progress [Member] | NCUC | Annual revenue requirement
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amended amount		$ 25
Duke Energy Progress [Member] | NCUC | Annual revenue requirement | Subsequent event
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amended amount	$ 842
Duke Energy Progress [Member] | PSCSC | South Carolina Rate Case 2018
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount						$ 59
Approved return on equity percentage					9.50%
Public utilities, approved equity capital structure, percentage					53.00%
Public utilities, approved debt capital structure, percentage					47.00%
Change in tax rate, deferred tax liability, income tax benefit					$ (17)
Measurement period adjustment, income tax expense (benefit)					12
Duke Energy Progress [Member] | PSCSC | South Carolina Rate Case 2018 | State and local jurisdiction | North Carolina Department of Revenue
Public Utilities, General Disclosures [Line Items]
State and local taxes reduction amount					(12)
Duke Energy Progress [Member] | Asset retirement obligations - coal ash | PSCSC | South Carolina Rate Case 2018
Public Utilities, General Disclosures [Line Items]
Regulatory assets					$ 4
Regulatory asset, amortization period					5 years
Recovery costs denied					$ 65
Duke Energy Progress [Member] | Asset retirement obligations - unprotected EDIT, Property, Plant and Equipment | PSCSC | South Carolina Rate Case 2018
Public Utilities, General Disclosures [Line Items]
Regulatory asset, amortization period					20 years
Duke Energy Progress [Member] | Asset retirement obligations - unprotected EDIT | PSCSC | South Carolina Rate Case 2018
Public Utilities, General Disclosures [Line Items]
Regulatory asset, amortization period					5 years
Duke Energy Progress [Member] | Asset retirement obligations - deferred revenue | PSCSC | South Carolina Rate Case 2018
Public Utilities, General Disclosures [Line Items]
Regulatory asset, amortization period					3 years
15-year storm recovery bond | Duke Energy Carolinas | Subsequent event
Public Utilities, General Disclosures [Line Items]
Bond term	15 years

Regulatory Matters (Regulator_2

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

Oct. 26, 2020USD ($)

Oct. 16, 2020

Jul. 31, 2020USD ($)

Jun. 17, 2020USD ($)

Jan. 29, 2020USD ($)MW

Oct. 30, 2019USD ($)

Oct. 11, 2019

May 21, 2019USD ($)

Nov. 08, 2018USD ($)

Nov. 22, 2017

Jun. 01, 2017USD ($)

Sep. 30, 2020USD ($)

Jul. 27, 2020MW

Jul. 01, 2020USD ($)

Feb. 07, 2020USD ($)

Dec. 31, 2019USD ($)

Sep. 30, 2019USD ($)

2017 North Carolina Rate Case | NCUC

Public Utilities, General Disclosures [Line Items]

Requested rate increase (decrease), amount

$ 477

Requested rate increase (decrease), amended amount

$ 420

Requested return on equity, percent

9.90%

Public utilities, requested equity capital structure, percentage

52.00%

Public utilities, requested debt capital structure, percentage

48.00%

2019 North Carolina Rate Case | NCUC

Public Utilities, General Disclosures [Line Items]

Requested rate increase (decrease), amount

$ 464

Requested rate increase, percentage

12.30%

Requested rate increase (decrease), gross amount

$ 586

Rider reduction

122

Requested rate increase (decrease), rider reduction

$ 120

2019 North Carolina Rate Case, additional Agreement and Stipulation of Partial Settlement | NCUC

Public Utilities, General Disclosures [Line Items]

Requested rate increase (decrease), amended amount

$ 500

Requested return on equity, percent

9.60%

Public utilities, requested equity capital structure, percentage

52.00%

Public utilities, requested debt capital structure, percentage

48.00%

Regulatory asset, amortization period

5 years

Annual revenue requirement | NCUC

Public Utilities, General Disclosures [Line Items]

Requested rate increase (decrease), amended amount

$ 25

Annual revenue requirement | Subsequent event | NCUC

Public Utilities, General Disclosures [Line Items]

Requested rate increase (decrease), amended amount

$ 842

Hurricane Dorian storm damage

Public Utilities, General Disclosures [Line Items]

Estimated storm costs - O&M

$ 168

Estimated storm costs - capital investments

$ 4

Hurricane Dorian storm damage | PSCSC

Public Utilities, General Disclosures [Line Items]

Storm deferral - O&M

$ 22

Requested supplemental true-up

$ 17

Hurricane Dorian storm damage | Storm costs

Public Utilities, General Disclosures [Line Items]

Regulatory assets

$ 145

$ 179

South Carolina Rate Case 2018 | PSCSC

Public Utilities, General Disclosures [Line Items]

Requested rate increase (decrease), amount

$ 59

Approved return on equity percentage

9.50%

Public utilities, approved equity capital structure, percentage

53.00%

Public utilities, approved debt capital structure, percentage

47.00%

Change in tax rate, deferred tax liability, income tax benefit

$ 17

Measurement period adjustment, income tax expense (benefit)

12

South Carolina Rate Case 2018 | State and local jurisdiction | North Carolina Department of Revenue | PSCSC

Public Utilities, General Disclosures [Line Items]

State and local taxes increase amount

12

South Carolina Rate Case 2018 | Asset retirement obligations - coal ash | PSCSC

Public Utilities, General Disclosures [Line Items]

Regulatory assets

4

Recovery costs denied

$ 65

Regulatory asset, amortization period

5 years

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

Public Utilities, General Disclosures [Line Items]

Regulatory asset, amortization period

20 years

South Carolina Rate Case 2018 | Asset retirement obligations - unprotected EDIT | PSCSC

Public Utilities, General Disclosures [Line Items]

Regulatory asset, amortization period

5 years

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

Public Utilities, General Disclosures [Line Items]

Regulatory asset, amortization period

3 years

Western Carolinas Modernization Plan

Public Utilities, General Disclosures [Line Items]

Generation capacity (MW) | MW

5

Western Carolinas Modernization Plan | Asheville Plant

Public Utilities, General Disclosures [Line Items]

Capacity (in MW) | MW

376

Generation facilities retired, net

$ 214

Western Carolinas Modernization Plan | Depreciation expense, property taxes, incremental O&M and carrying costs | PSCSC

Public Utilities, General Disclosures [Line Items]

Approved annual rate increase (decrease), amount

$ 8

FERC Return on Equity Complaint, NCEMPA | FERC

Public Utilities, General Disclosures [Line Items]

Approved return on equity percentage

11.00%

FERC Return on Equity Complaint, NCEMC | Subsequent event | FERC

Public Utilities, General Disclosures [Line Items]

Approved return on equity percentage

11.00%

Regulatory Matters (Regulator_3

Regulatory Matters (Regulatory Matters Narrative - Duke Energy Florida) (Details) - Duke Energy Florida $ in Millions	Jul. 01, 2020USD ($)plantMW	Sep. 30, 2020USD ($)	May 19, 2020USD ($)	Apr. 02, 2020USD ($)	Dec. 31, 2019USD ($)	Dec. 19, 2019USD ($)	Nov. 22, 2019USD ($)	Apr. 30, 2019USD ($)
FPSC
Public Utilities, General Disclosures [Line Items]
Accelerated fuel cost refund				$ 78
Number of solar plants | plant	10
Generation capacity (MW) | MW	750
Hurricane Michael storm damage
Public Utilities, General Disclosures [Line Items]
Estimated storm costs - capital and operation maintenance		$ 119			$ 204
Hurricane Michael storm damage | FPSC
Public Utilities, General Disclosures [Line Items]
Estimated storm costs - capital and operation maintenance								$ 223
Amount of recovery costs sought			$ 188				$ 191
Requested supplemental true-up			$ 3
Hurricane Dorian storm damage
Public Utilities, General Disclosures [Line Items]
Estimated storm costs - capital and operation maintenance		38			$ 167
Hurricane Dorian storm damage | FPSC
Public Utilities, General Disclosures [Line Items]
Estimated storm costs - capital and operation maintenance						$ 169
Actual storm costs - capital and operation maintenance		$ 145
Solar Project
Public Utilities, General Disclosures [Line Items]
Estimated cost of facilities	$ 1,000
Estimated cost of facilities period	4 years

Regulatory Matters (Regulator_4

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

Oct. 16, 2020USD ($)

Apr. 27, 2020USD ($)

Jan. 31, 2020USD ($)

Sep. 03, 2019USD ($)

Apr. 13, 2018USD ($)

Mar. 31, 2017USD ($)

Sep. 30, 2020USD ($)site

Jul. 23, 2020USD ($)

Mar. 31, 2020USD ($)

Jul. 12, 2019USD ($)

Mar. 29, 2019USD ($)

Sep. 28, 2018USD ($)

Duke Energy Ohio | Ohio Base Rate Case 2017 | PUCO

Public Utilities, General Disclosures [Line Items]

Requested rate increase (decrease), amount

$ 15

Requested return on equity, percent

10.40%

Requested rate increase (decrease), amended amount

$ (19)

Requested rate increase (decrease) amended, percentage

9.84%

Public utilities, requested equity capital structure, percentage

50.75%

Public utilities, requested debt capital structure, percentage

49.25%

Approved rate increase (decrease), amount

$ (20)

Duke Energy Ohio | Ohio Base Rate Case 2017 | PUCO | Maximum

Public Utilities, General Disclosures [Line Items]

Requested rider revenue increase

$ 10

Duke Energy Ohio | Natural Gas Pipeline extension | OPSB | Minimum

Public Utilities, General Disclosures [Line Items]

Estimated capital cost excluding AFUDC

$ 163

Duke Energy Ohio | Natural Gas Pipeline extension | OPSB | Maximum

Public Utilities, General Disclosures [Line Items]

Estimated capital cost excluding AFUDC

$ 245

Duke Energy Ohio | MGP Cost Recovery - 2009 Through 2012 | PUCO

Public Utilities, General Disclosures [Line Items]

Number of environmental remediation sites | site

2

Regulatory assets

$ 55

Duke Energy Ohio | MGP Cost Recovery - 2013 Through 2017 | PUCO

Public Utilities, General Disclosures [Line Items]

Regulatory assets

$ 26

Duke Energy Ohio | MGP Cost Recovery - 2013 Through 2017 | PUCO | MGP Costs - regulatory disallowance

Public Utilities, General Disclosures [Line Items]

Regulatory assets

$ 12

Duke Energy Ohio | MGP Cost Recovery - 2018 | PUCO

Public Utilities, General Disclosures [Line Items]

Regulatory assets

$ 20

Duke Energy Ohio | MGP Cost Recovery - 2018 | PUCO | MGP Costs - regulatory disallowance

Public Utilities, General Disclosures [Line Items]

Regulatory assets

$ 11

Duke Energy Ohio | MGP Cost Recovery - 2019 | PUCO

Public Utilities, General Disclosures [Line Items]

Regulatory assets

$ 4

$ 39

Duke Energy Kentucky | Duke Energy Kentucky Electric base rate case | KPSC

Public Utilities, General Disclosures [Line Items]

Requested rate increase (decrease), amount

$ 46

Requested rate increase (decrease), amended amount

$ 44

Approved rate increase (decrease), amount

$ 24

Approved return on equity percentage

9.25%

Duke Energy Kentucky | Duke Energy Kentucky Electric base rate case | KPSC | Subsequent event

Public Utilities, General Disclosures [Line Items]

Approved rate increase (decrease), amount

$ 28

Approved additional increase

$ 4

Regulatory Matters (Regulator_5

Regulatory Matters (Regulatory Matters Narrative - Duke Energy Indiana) (Details) - Duke Energy Indiana - IURC - Indiana rate case 2019 - USD ($) $ in Millions	Jun. 29, 2020	Dec. 04, 2019	Jul. 02, 2019
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount			$ 395
Requested rate increase, percentage, net of tax		15.60%
Requested rate increase (decrease), amended amount		$ 396
Approved rate increase, amount	$ 146
Public utilities, approved rate increase (decrease), percentage	5.70%
Approved return on equity percentage	9.70%
Public utilities, approved equity capital structure, percentage	53.00%
Rate base	$ 10,200
Reduction of requested rate base	$ 200
Reduction due to depreciation methodology	50.00%
Reduction due to approved return on equity	20.00%
Requested return on equity, percent	10.40%
Reduction due to earnings adjustments	20.00%
Estimated step one rate	75.00%
Estimated step two rate	25.00%

Regulatory Matters (Regulator_6

Regulatory Matters (Regulatory Matters Narrative - Piedmont) (Details) - 2020 Tennessee Rate Case - TPUC - Piedmont Natural Gas $ in Millions	Jul. 02, 2020USD ($)
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount	$ 30
Increase in annual revenue, percent	15.00%

Regulatory Matters (Other Regul

Regulatory Matters (Other Regulatory Matters) (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Public Utilities, General Disclosures [Line Items]
Equity in losses (earnings) of unconsolidated affiliates	$ 80,000,000	$ (50,000,000)	$ 2,004,000,000	$ (137,000,000)
Income tax benefit	105,000,000	188,000,000	(74,000,000)	424,000,000
Current Liabilities: Other	2,829,000,000		2,829,000,000		$ 2,367,000,000
Asset retirement obligations	742,000,000		742,000,000		881,000,000
Duke Energy Carolinas
Public Utilities, General Disclosures [Line Items]
Income tax benefit	76,000,000	118,000,000	178,000,000	255,000,000
Current Liabilities: Other	487,000,000		487,000,000		611,000,000
Asset retirement obligations	267,000,000		267,000,000		206,000,000
Duke Energy Progress
Public Utilities, General Disclosures [Line Items]
Income tax benefit	11,000,000	$ 48,000,000	79,000,000	$ 125,000,000
Current Liabilities: Other	389,000,000		389,000,000		478,000,000
Asset retirement obligations	297,000,000		297,000,000		485,000,000
ACP
Public Utilities, General Disclosures [Line Items]
Current Liabilities: Other	935,000,000		935,000,000		$ 0
ACP | ACP
Public Utilities, General Disclosures [Line Items]
Equity in losses (earnings) of unconsolidated affiliates			2,100,000,000
Income tax benefit			389,000,000
Expected costs (less than)	50,000,000		50,000,000
Current Liabilities: Other	927,000,000		927,000,000
Other Noncurrent Liabilities	19,000,000		19,000,000
ACP | ACP | Current liabilities
Public Utilities, General Disclosures [Line Items]
Guarantees of outstanding debt	860,000,000		860,000,000
Asset retirement obligations	$ 86,000,000		$ 86,000,000
ACP
Public Utilities, General Disclosures [Line Items]
Joint owner ownership percentage	47.00%		47.00%

Regulatory Matters (Schedule of

Regulatory Matters (Schedule of Net Carrying Value Of Facilities and Megawatt Capacity) (Details) $ in Millions	9 Months Ended
	Sep. 30, 2020USD ($)MW	Dec. 31, 2019USD ($)
Public Utilities, General Disclosures [Line Items]
Public utilities, property, plant and equipment, net	$ 105,760	$ 102,127
Duke Energy Carolinas
Public Utilities, General Disclosures [Line Items]
Public utilities, property, plant and equipment, net	33,216	32,397
Duke Energy Progress
Public Utilities, General Disclosures [Line Items]
Public utilities, property, plant and equipment, net	22,960	22,934
Duke Energy Indiana
Public Utilities, General Disclosures [Line Items]
Public utilities, property, plant and equipment, net	$ 11,644	$ 11,072
Generation facilities to be retired
Public Utilities, General Disclosures [Line Items]
Capacity (in MW) | MW	8,178
Public utilities, property, plant and equipment, net	$ 4,706
Generation facilities to be retired | Duke Energy Carolinas | Allen Steam Station Units 1-3
Public Utilities, General Disclosures [Line Items]
Capacity (in MW) | MW	582
Public utilities, property, plant and equipment, net	$ 141
Generation facilities to be retired | Duke Energy Carolinas | Allen Steam Station Units 4-5
Public Utilities, General Disclosures [Line Items]
Capacity (in MW) | MW	516
Public utilities, property, plant and equipment, net	$ 321
Generation facilities to be retired | Duke Energy Carolinas | Cliffside Unit 5
Public Utilities, General Disclosures [Line Items]
Capacity (in MW) | MW	544
Public utilities, property, plant and equipment, net	$ 355
Generation facilities to be retired | Duke Energy Progress | Mayo Unit 1
Public Utilities, General Disclosures [Line Items]
Capacity (in MW) | MW	727
Public utilities, property, plant and equipment, net	$ 673
Generation facilities to be retired | Duke Energy Progress | Roxboro Units 3-4
Public Utilities, General Disclosures [Line Items]
Capacity (in MW) | MW	1,392
Public utilities, property, plant and equipment, net	$ 486
Generation facilities to be retired | Duke Energy Indiana | Gallagher Units 2 and 4
Public Utilities, General Disclosures [Line Items]
Capacity (in MW) | MW	280
Public utilities, property, plant and equipment, net	$ 112
Generation facilities to be retired | Duke Energy Indiana | Gibson Units 1-5
Public Utilities, General Disclosures [Line Items]
Capacity (in MW) | MW	3,132
Public utilities, property, plant and equipment, net	$ 1,683
Generation facilities to be retired | Duke Energy Indiana | Cayuga Units 1-2
Public Utilities, General Disclosures [Line Items]
Capacity (in MW) | MW	1,005
Public utilities, property, plant and equipment, net	$ 935

Commitments and Contingencies_2

Commitments and Contingencies (Schedule of Environmental Loss Contingencies) (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2020	Dec. 31, 2019
Environmental Matters Details [Line Items]
Reserves for Environmental Remediation	$ 66	$ 58
Environmental exit costs, reasonably possible additional loss	56
Duke Energy Carolinas
Environmental Matters Details [Line Items]
Reserves for Environmental Remediation	16	11
Environmental exit costs, reasonably possible additional loss	12
Progress Energy
Environmental Matters Details [Line Items]
Reserves for Environmental Remediation	15	16
Duke Energy Progress
Environmental Matters Details [Line Items]
Reserves for Environmental Remediation	5	4
Duke Energy Florida
Environmental Matters Details [Line Items]
Reserves for Environmental Remediation	8	9
Duke Energy Ohio
Environmental Matters Details [Line Items]
Reserves for Environmental Remediation	22	19
Environmental exit costs, reasonably possible additional loss	38
Duke Energy Indiana
Environmental Matters Details [Line Items]
Reserves for Environmental Remediation	5	4
Piedmont Natural Gas
Environmental Matters Details [Line Items]
Reserves for Environmental Remediation	$ 8	$ 8

Commitments and Contingencies_3

Commitments and Contingencies (Narrative) (Details) $ in Millions	Jun. 18, 2018USD ($)	Sep. 30, 2020USD ($)plantclaim	Jan. 01, 2020USD ($)	Dec. 31, 2019USD ($)
ASU 2016-13 | ACP
Loss Contingencies [Line Items]
Reserve for credit losses for financial guarantees			$ 95
Coal Ash Insurance Coverage Litigation
Loss Contingencies [Line Items]
Number of NC and SC Plants with Ash Basins | plant		15
Duke Energy Carolinas | Asbestos-related Injuries and Damages Claims
Loss Contingencies [Line Items]
Asbestos-related injuries and damages reserves		$ 578		$ 604
Reinsurance retention policy, excess retention, amount reinsured		714
Probable insurance recoveries		$ 704		$ 742
Duke Energy Carolinas | Asbestos-related Injuries and Damages Claims | Non-malignant cases
Loss Contingencies [Line Items]
Loss contingency, pending claims, number | claim		159
Asbestos-related injuries and damages reserves		$ 41
Duke Energy Carolinas | Asbestos-related Injuries and Damages Claims | Malignant cases
Loss Contingencies [Line Items]
Loss contingency, pending claims, number | claim		68
Asbestos-related injuries and damages reserves		$ 23
Duke Energy Progress | Spent Nuclear Fuel Matters
Loss Contingencies [Line Items]
Pending litigation, damages sought	$ 100
Duke Energy Florida | Spent Nuclear Fuel Matters
Loss Contingencies [Line Items]
Pending litigation, damages sought	$ 203
Duke Energy and Duke Energy Carolinas | ASU 2016-13
Loss Contingencies [Line Items]
Reserve for credit losses for insurance receivables		15
Other Noncurrent Liabilities | ASU 2016-13
Loss Contingencies [Line Items]
Reserve for credit losses for financial guarantees		4
ACP | Other Current Liabilities | ACP
Loss Contingencies [Line Items]
Guarantees of outstanding debt		$ 860

Commitments and Contingencies_4

Commitments and Contingencies (Schedule of Legal Reserves) (Details) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Loss Contingencies [Line Items]
Reserves for legal matters	$ 60	$ 62
Duke Energy Carolinas
Loss Contingencies [Line Items]
Reserves for legal matters	2	2
Progress Energy
Loss Contingencies [Line Items]
Reserves for legal matters	52	55
Duke Energy Progress
Loss Contingencies [Line Items]
Reserves for legal matters	9	12
Duke Energy Florida
Loss Contingencies [Line Items]
Reserves for legal matters	23	22
Piedmont Natural Gas
Loss Contingencies [Line Items]
Reserves for legal matters	$ 1	$ 1

Debt and Credit Facilities (Sum

Debt and Credit Facilities (Summary of Debt Issuances) (Details) - USD ($)	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Debt Instrument [Line Items]
Debt issuances	$ 5,550,000,000
Repayments of long-term debt	3,468,000,000	$ 2,737,000,000
Duke Energy (Parent)
Debt Instrument [Line Items]
Debt issuances	1,500,000,000
Duke Energy (Parent) | Revolving Credit Facility
Debt Instrument [Line Items]
Repayments of long-term debt	500,000,000
Duke Energy Carolinas
Debt Instrument [Line Items]
Debt issuances	900,000,000
Repayments of long-term debt	457,000,000	5,000,000
Duke Energy Progress
Debt Instrument [Line Items]
Debt issuances	1,300,000,000
Repayments of long-term debt	985,000,000	603,000,000
Duke Energy Florida
Debt Instrument [Line Items]
Debt issuances	500,000,000
Repayments of long-term debt	570,000,000	210,000,000
Duke Energy Ohio
Debt Instrument [Line Items]
Debt issuances	400,000,000
Repayments of long-term debt		451,000,000
Duke Energy Indiana
Debt Instrument [Line Items]
Debt issuances	550,000,000
Repayments of long-term debt	500,000,000	60,000,000
Piedmont Natural Gas
Debt Instrument [Line Items]
Debt issuances	$ 400,000,000
Repayments of long-term debt		$ 350,000,000
Unsecured Debt | May 2020 2.450% Due 2030
Debt Instrument [Line Items]
Interest Rate	2.45%
Debt issuances	$ 500,000,000
Unsecured Debt | May 2020 3.350% Due 2050
Debt Instrument [Line Items]
Interest Rate	3.35%
Debt issuances	$ 400,000,000
Unsecured Debt | August 2020 0.450% Due 2022
Debt Instrument [Line Items]
Interest Rate	0.43%
Debt issuances	$ 700,000,000
Facility term	2 years
Unsecured Debt | September 2020 0.900% Due 2025
Debt Instrument [Line Items]
Interest Rate	0.90%
Debt issuances	$ 650,000,000
Unsecured Debt | September 2020 2.450% Due 2030
Debt Instrument [Line Items]
Interest Rate	2.45%
Debt issuances	$ 350,000,000
Unsecured Debt | Duke Energy (Parent) | May 2020 2.450% Due 2030
Debt Instrument [Line Items]
Debt issuances	500,000,000
Unsecured Debt | Duke Energy (Parent) | September 2020 0.900% Due 2025
Debt Instrument [Line Items]
Debt issuances	650,000,000
Unsecured Debt | Duke Energy (Parent) | September 2020 2.450% Due 2030
Debt Instrument [Line Items]
Debt issuances	350,000,000
Unsecured Debt | Duke Energy (Parent) | Term loan due March 2021
Debt Instrument [Line Items]
Repayments of long-term debt	1,700,000,000
Unsecured Debt | Duke Energy Progress | August 2020 0.450% Due 2022
Debt Instrument [Line Items]
Debt issuances	700,000,000
Unsecured Debt | Duke Energy Progress | Two-year term loan facility expiring in December 2020
Debt Instrument [Line Items]
Repayments of long-term debt	700,000,000
Unsecured Debt | Piedmont Natural Gas | May 2020 3.350% Due 2050
Debt Instrument [Line Items]
Debt issuances	$ 400,000,000
First Mortgage Bonds | January 2020 2.450% Due 2030
Debt Instrument [Line Items]
Interest Rate	2.45%
Debt issuances	$ 500,000,000
First Mortgage Bonds | January 2020 3.20% Due 2049
Debt Instrument [Line Items]
Interest Rate	3.20%
Debt issuances	$ 400,000,000
First Mortgage Bonds | March 2020 2.750% Due 2050
Debt Instrument [Line Items]
Interest Rate	2.75%
Debt issuances	$ 550,000,000
First Mortgage Bonds | May 2020 2.125% Due 2030
Debt Instrument [Line Items]
Interest Rate	2.125%
Debt issuances	$ 400,000,000
First Mortgage Bonds | June 2020 1.750% Due 2030
Debt Instrument [Line Items]
Interest Rate	1.75%
Debt issuances	$ 500,000,000
First Mortgage Bonds | August 2020 2.500% Due 2050
Debt Instrument [Line Items]
Interest Rate	2.50%
Debt issuances	$ 600,000,000
First Mortgage Bonds | Duke Energy Carolinas | January 2020 2.450% Due 2030
Debt Instrument [Line Items]
Debt issuances	500,000,000
First Mortgage Bonds | Duke Energy Carolinas | January 2020 3.20% Due 2049
Debt Instrument [Line Items]
Debt issuances	400,000,000
First Mortgage Bonds | Duke Energy Carolinas | First mortgage bonds due June 2020
Debt Instrument [Line Items]
Repayments of long-term debt	450,000,000
First Mortgage Bonds | Duke Energy Progress | August 2020 2.500% Due 2050
Debt Instrument [Line Items]
Debt issuances	600,000,000
First Mortgage Bonds | Duke Energy Progress | First mortgage bonds due September 2020
Debt Instrument [Line Items]
Repayments of long-term debt	300,000,000
First Mortgage Bonds | Duke Energy Florida | June 2020 1.750% Due 2030
Debt Instrument [Line Items]
Debt issuances	500,000,000
First Mortgage Bonds | Duke Energy Ohio | May 2020 2.125% Due 2030
Debt Instrument [Line Items]
Debt issuances	400,000,000
First Mortgage Bonds | Duke Energy Indiana | March 2020 2.750% Due 2050
Debt Instrument [Line Items]
Debt issuances	550,000,000
First Mortgage Bonds | Duke Energy Indiana | First mortgage bonds due July 2020
Debt Instrument [Line Items]
Repayments of long-term debt	$ 500,000,000

Debt and Credit Facilities (S_2

Debt and Credit Facilities (Summary of Current Maturities of Long-term Debt) (Details) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Current maturities of long-term debt	$ 4,669	$ 3,141
Other debt obligations
Debt Instrument [Line Items]
Current maturities of long-term debt	609
Progress Energy
Debt Instrument [Line Items]
Current maturities of long-term debt	$ 1,726	1,577
Progress Energy | Unsecured Debt | Debt maturing January 2021, 4.400% interest rate
Debt Instrument [Line Items]
Interest Rate	4.40%
Current maturities of long-term debt	$ 500
Duke Energy (Parent) | Unsecured Debt | Debt maturing May 2021, floating interest rate
Debt Instrument [Line Items]
Interest Rate	0.765%
Current maturities of long-term debt	$ 500
Duke Energy (Parent) | Unsecured Debt | Debt maturing September 2021, 3.550% interest rate
Debt Instrument [Line Items]
Interest Rate	3.55%
Current maturities of long-term debt	$ 500
Duke Energy (Parent) | Unsecured Debt | Debt maturing September 2021, 1.800% interest rate
Debt Instrument [Line Items]
Interest Rate	1.80%
Current maturities of long-term debt	$ 750
Piedmont Natural Gas
Debt Instrument [Line Items]
Current maturities of long-term debt	$ 160
Piedmont Natural Gas | Unsecured Debt | Debt maturing June 2021, 4.240% interest rate
Debt Instrument [Line Items]
Interest Rate	4.24%
Current maturities of long-term debt	$ 160
Duke Energy Florida
Debt Instrument [Line Items]
Current maturities of long-term debt	$ 623	571
Duke Energy Florida | Secured Debt | Debt maturing April 2021, floating interest rate
Debt Instrument [Line Items]
Interest Rate	1.035%
Current maturities of long-term debt	$ 250
Duke Energy Florida | First Mortgage Bonds | Bonds maturing August 2021, 3.100% interest rate
Debt Instrument [Line Items]
Interest Rate	3.10%
Current maturities of long-term debt	$ 300
Duke Energy Carolinas
Debt Instrument [Line Items]
Current maturities of long-term debt	$ 751	458
Duke Energy Carolinas | First Mortgage Bonds | Bonds maturing June 2021, 3.900% interest rate
Debt Instrument [Line Items]
Interest Rate	3.90%
Current maturities of long-term debt	$ 500
Duke Energy Progress
Debt Instrument [Line Items]
Current maturities of long-term debt	$ 603	$ 1,006
Duke Energy Progress | First Mortgage Bonds | Debt maturing September 2021, 3.000% interest rate
Debt Instrument [Line Items]
Interest Rate	3.00%
Current maturities of long-term debt	$ 500
Duke Energy Progress | First Mortgage Bonds | Debt maturing September 2021, 8.625% interest rate
Debt Instrument [Line Items]
Interest Rate	8.625%
Current maturities of long-term debt	$ 100

Debt and Credit Facilities (Nar

Debt and Credit Facilities (Narrative) (Details) - USD ($)	Mar. 27, 2020	Mar. 19, 2020	Aug. 31, 2020	Sep. 30, 2020	Sep. 30, 2020	Sep. 30, 2019	Mar. 31, 2020
Debt Instrument [Line Items]
Repayments of long-term debt					$ 3,468,000,000	$ 2,737,000,000
Duke Energy Progress
Debt Instrument [Line Items]
Repayments of long-term debt					985,000,000	$ 603,000,000
Master Credit Facility
Debt Instrument [Line Items]
Facility size				$ 8,000,000,000	8,000,000,000		$ 8,000,000,000
Master Credit Facility | Duke Energy (Parent)
Debt Instrument [Line Items]
Repayments of long-term debt					500,000,000
Master Credit Facility | Duke Energy Progress
Debt Instrument [Line Items]
Facility size				1,250,000,000	$ 1,250,000,000
Term Loan Facility | 364-day Term Loan Credit Agreement | Duke Energy (Parent)
Debt Instrument [Line Items]
Facility size							1,500,000,000
Borrowing amount	$ 188,000,000	$ 1,500,000,000
Increase in borrowing limit							$ 500,000,000
Repayments of long-term debt				$ 844,000,000
Term Loan Facility | Two-year term loan facility | Duke Energy Progress
Debt Instrument [Line Items]
Repayments of long-term debt			$ 700,000,000
Facility term			2 years

Debt and Credit Facilities (Sch

Debt and Credit Facilities (Schedule of Line of Credit Facilities) (Details) - Master Credit Facility - USD ($)	Sep. 30, 2020	Mar. 31, 2020
Line of Credit Facility [Line Items]
Facility size	$ 8,000,000,000	$ 8,000,000,000
Commercial paper	(2,007,000,000)
Outstanding letters of credit	(40,000,000)
Tax-exempt bonds	(81,000,000)
Available capacity under the Master Credit Facility	5,872,000,000
Duke Energy Carolinas
Line of Credit Facility [Line Items]
Facility size	1,475,000,000
Commercial paper	(300,000,000)
Outstanding letters of credit	(4,000,000)
Available capacity under the Master Credit Facility	1,171,000,000
Duke Energy Progress
Line of Credit Facility [Line Items]
Facility size	1,250,000,000
Commercial paper	(308,000,000)
Outstanding letters of credit	(2,000,000)
Available capacity under the Master Credit Facility	940,000,000
Duke Energy Florida
Line of Credit Facility [Line Items]
Facility size	800,000,000
Commercial paper	(62,000,000)
Available capacity under the Master Credit Facility	738,000,000
Duke Energy Ohio
Line of Credit Facility [Line Items]
Facility size	625,000,000
Commercial paper	(106,000,000)
Available capacity under the Master Credit Facility	519,000,000
Duke Energy Indiana
Line of Credit Facility [Line Items]
Facility size	600,000,000
Commercial paper	(229,000,000)
Tax-exempt bonds	(81,000,000)
Available capacity under the Master Credit Facility	290,000,000
Piedmont Natural Gas
Line of Credit Facility [Line Items]
Facility size	600,000,000
Commercial paper	(309,000,000)
Available capacity under the Master Credit Facility	291,000,000
Duke Energy (Parent) | Proceeds loaned to subsidiary registrants
Line of Credit Facility [Line Items]
Commercial paper	(625,000,000)
Duke Energy (Parent) | Duke Energy (Parent)
Line of Credit Facility [Line Items]
Facility size	2,650,000,000
Commercial paper	(693,000,000)
Outstanding letters of credit	(34,000,000)
Available capacity under the Master Credit Facility	$ 1,923,000,000

Debt and Credit Facilities (S_3

Debt and Credit Facilities (Schedule of Other Credit Facilities) (Details) - Master Credit Facility - USD ($)	9 Months Ended
	Sep. 30, 2020	Mar. 31, 2020
Line of Credit Facility [Line Items]
Facility size	$ 8,000,000,000	$ 8,000,000,000
Duke Energy (Parent) Three-Year Revolving Credit Facility | Duke Energy (Parent)
Line of Credit Facility [Line Items]
Facility term	3 years
Facility size	$ 1,000,000,000
Amount drawn	$ 500,000,000

Asset Retirement Obligations (A

Asset Retirement Obligations (ARO by Category) (Details) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Asset Retirement Obligations [Line Items]
Total ARO	$ 13,654	$ 13,318
Less: Current portion	742	881
Total noncurrent ARO	12,912	12,437
Duke Energy Carolinas
Asset Retirement Obligations [Line Items]
Total ARO	5,774	5,734
Less: Current portion	267	206
Total noncurrent ARO	5,507	5,528
Progress Energy
Asset Retirement Obligations [Line Items]
Total ARO	6,355	6,471
Less: Current portion	297	485
Total noncurrent ARO	6,058	5,986
Duke Energy Progress
Asset Retirement Obligations [Line Items]
Total ARO	5,800	5,893
Less: Current portion	297	485
Total noncurrent ARO	5,503	5,408
Duke Energy Florida
Asset Retirement Obligations [Line Items]
Total ARO	555	578
Total noncurrent ARO	555	578
Duke Energy Ohio
Asset Retirement Obligations [Line Items]
Total ARO	91	80
Less: Current portion	7	1
Total noncurrent ARO	84	79
Duke Energy Indiana
Asset Retirement Obligations [Line Items]
Total ARO	1,214	832
Less: Current portion	170	189
Total noncurrent ARO	1,044	643
Piedmont Natural Gas
Asset Retirement Obligations [Line Items]
Total ARO	17	17
Total noncurrent ARO	17	$ 17
Decommissioning of nuclear power facilities
Asset Retirement Obligations [Line Items]
Total ARO	6,815
Decommissioning of nuclear power facilities | Duke Energy Carolinas
Asset Retirement Obligations [Line Items]
Total ARO	2,658
Decommissioning of nuclear power facilities | Progress Energy
Asset Retirement Obligations [Line Items]
Total ARO	4,107
Decommissioning of nuclear power facilities | Duke Energy Progress
Asset Retirement Obligations [Line Items]
Total ARO	3,606
Decommissioning of nuclear power facilities | Duke Energy Florida
Asset Retirement Obligations [Line Items]
Total ARO	501
Closure of ash impoundments
Asset Retirement Obligations [Line Items]
Total ARO	6,458
Closure of ash impoundments | Duke Energy Carolinas
Asset Retirement Obligations [Line Items]
Total ARO	3,049
Closure of ash impoundments | Progress Energy
Asset Retirement Obligations [Line Items]
Total ARO	2,172
Closure of ash impoundments | Duke Energy Progress
Asset Retirement Obligations [Line Items]
Total ARO	2,150
Closure of ash impoundments | Duke Energy Florida
Asset Retirement Obligations [Line Items]
Total ARO	22
Closure of ash impoundments | Duke Energy Ohio
Asset Retirement Obligations [Line Items]
Total ARO	51
Closure of ash impoundments | Duke Energy Indiana
Asset Retirement Obligations [Line Items]
Total ARO	1,186
Other
Asset Retirement Obligations [Line Items]
Total ARO	381
Other | Duke Energy Carolinas
Asset Retirement Obligations [Line Items]
Total ARO	67
Other | Progress Energy
Asset Retirement Obligations [Line Items]
Total ARO	76
Other | Duke Energy Progress
Asset Retirement Obligations [Line Items]
Total ARO	44
Other | Duke Energy Florida
Asset Retirement Obligations [Line Items]
Total ARO	32
Other | Duke Energy Ohio
Asset Retirement Obligations [Line Items]
Total ARO	40
Other | Duke Energy Indiana
Asset Retirement Obligations [Line Items]
Total ARO	28
Other | Piedmont Natural Gas
Asset Retirement Obligations [Line Items]
Total ARO	$ 17

Asset Retirement Obligations _2

Asset Retirement Obligations (ARO Rollforward) (Details) $ in Millions	9 Months Ended
	Sep. 30, 2020USD ($)
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Balance at beginning of period	$ 13,318
Accretion expense	408
Liabilities settled	(540)
Liabilities incurred in the current year	17
Revision in estimates of cash flows	451
Balance at end of period	13,654
Duke Energy Carolinas
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Balance at beginning of period	5,734
Accretion expense	195
Liabilities settled	(151)
Revision in estimates of cash flows	(4)
Balance at end of period	5,774
Progress Energy
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Balance at beginning of period	6,471
Accretion expense	187
Liabilities settled	(333)
Revision in estimates of cash flows	30
Balance at end of period	6,355
Duke Energy Progress
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Balance at beginning of period	5,893
Accretion expense	171
Liabilities settled	(293)
Revision in estimates of cash flows	29
Balance at end of period	5,800
Duke Energy Florida
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Balance at beginning of period	578
Accretion expense	16
Liabilities settled	(40)
Revision in estimates of cash flows	1
Balance at end of period	555
Duke Energy Ohio
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Balance at beginning of period	80
Accretion expense	3
Liabilities settled	(1)
Revision in estimates of cash flows	9
Balance at end of period	91
Duke Energy Indiana
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Balance at beginning of period	832
Accretion expense	22
Liabilities settled	(56)
Revision in estimates of cash flows	416
Balance at end of period	1,214
Piedmont Natural Gas
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Balance at beginning of period	17
Balance at end of period	$ 17

Goodwill (Rollforward of Goodwi

Goodwill (Rollforward of Goodwill) (Details) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Goodwill [Line Items]
Goodwill balance	$ 19,425	$ 19,425
Accumulated impairment charges	(122)	(122)
Goodwill, adjusted for accumulated impairment charges	19,303	19,303
Electric Utilities and Infrastructure
Goodwill [Line Items]
Goodwill balance	17,379	17,379
Goodwill, adjusted for accumulated impairment charges	17,379	17,379
Gas Utilities and Infrastructure
Goodwill [Line Items]
Goodwill balance	1,924	1,924
Goodwill, adjusted for accumulated impairment charges	1,924	1,924
Commercial Renewables
Goodwill [Line Items]
Goodwill balance	122	122
Accumulated impairment charges	$ (122)	$ (122)

Goodwill (Narrative) (Details)

Goodwill (Narrative) (Details) - USD ($)	Sep. 30, 2020	Dec. 31, 2019
Goodwill [Line Items]
Goodwill	$ 19,303,000,000	$ 19,303,000,000
Accumulated impairment charges	122,000,000	122,000,000
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
Accumulated impairment charges	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]
Accumulated impairment charges	0	0
Piedmont Natural Gas
Goodwill [Line Items]
Goodwill	49,000,000	49,000,000
Piedmont Natural Gas | Gas Utilities and Infrastructure
Goodwill [Line Items]
Accumulated impairment charges	$ 0	$ 0

Related Party Transactions (Oth

Related Party Transactions (Other Revenue and Expense) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 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	$ 198	$ 197	$ 528	$ 606
Duke Energy Carolinas | Indemnification coverages | Affiliated Entity
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	5	5	15	15
Duke Energy Carolinas | JDA | Duke Energy Progress
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	28	32	72	145
Related party transaction, other revenues from transactions with related party	6	12	16	52
Duke Energy Carolinas | Intercompany natural gas purchases and sales | Affiliated Entity
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	10	0	26	7
Progress Energy | Corporate governance and shared service expenses | Affiliated Entity
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	185	194	520	553
Progress Energy | Indemnification coverages | Affiliated Entity
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	9	8	27	27
Progress Energy | JDA | Duke Energy Carolinas
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	6	12	16	52
Related party transaction, other revenues from transactions with related party	28	32	72	145
Progress Energy | Intercompany natural gas purchases and sales | Affiliated Entity
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	18	19	56	57
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	113	114	301	328
Duke Energy Progress | Indemnification coverages | Affiliated Entity
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	4	3	13	11
Duke Energy Progress | JDA | Duke Energy Carolinas
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	6	12	16	52
Related party transaction, other revenues from transactions with related party	28	32	72	145
Duke Energy Progress | Intercompany natural gas purchases and sales | Affiliated Entity
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	18	19	56	57
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	72	80	219	225
Duke Energy Florida | Indemnification coverages | Affiliated Entity
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	5	5	14	16
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	80	90	241	258
Duke Energy Ohio | Indemnification coverages | Affiliated Entity
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	1	1	3	3
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	102	109	300	299
Duke Energy Indiana | Indemnification coverages | Affiliated Entity
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	2	2	6	5
Piedmont Natural Gas | Corporate governance and shared service expenses | Affiliated Entity
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	31	33	102	102
Piedmont Natural Gas | Indemnification coverages | Affiliated Entity
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	1	1	2	2
Piedmont Natural Gas | Intercompany natural gas purchases and sales | Affiliated Entity
Related Party Transaction [Line Items]
Related party transaction, other revenues from transactions with related party	28	19	82	64
Piedmont Natural Gas | Natural gas storage and transportation costs | Affiliated Entity
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	$ 6	$ 6	$ 17	$ 17

Related Party Transactions (Int

Related Party Transactions (Intercompany Income Taxes) (Details) - Affiliated Entity - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Duke Energy Carolinas
Related Party Transaction [Line Items]
Intercompany income tax payable	$ 206	$ 5
Progress Energy
Related Party Transaction [Line Items]
Intercompany income tax receivable		125
Intercompany income tax payable	49
Duke Energy Progress
Related Party Transaction [Line Items]
Intercompany income tax receivable		28
Intercompany income tax payable	104
Duke Energy Florida
Related Party Transaction [Line Items]
Intercompany income tax payable	98	2
Duke Energy Ohio
Related Party Transaction [Line Items]
Intercompany income tax receivable		9
Intercompany income tax payable	6
Duke Energy Indiana
Related Party Transaction [Line Items]
Intercompany income tax receivable		28
Intercompany income tax payable	56
Piedmont Natural Gas
Related Party Transaction [Line Items]
Intercompany income tax receivable	$ 14	$ 13

Derivatives and Hedging (Notion

Derivatives and Hedging (Notional Amounts of Derivative Instruments) (Details) Mcf in Millions, $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2020USD ($)GWhMcf	Dec. 31, 2019USD ($)GWhMcf
Interest Rate Contracts
Derivative [Line Items]
Notional amount	$ 1,830	$ 2,270
Commodity contracts | Cash flow hedges
Derivative [Line Items]
Notional amount, energy measure (in gigawatt-hours) | GWh	11,116
Commodity contracts | Electricity (GWh)(a)
Derivative [Line Items]
Notional amount, energy measure (in gigawatt-hours) | GWh	32,314	15,858
Commodity contracts | Natural gas (millions of dekatherms)
Derivative [Line Items]
Notional amount, volume (in millions of dekatherms) | Mcf	683	704
Designated contracts | Interest Rate Contracts
Derivative [Line Items]
Notional amount	$ 653	$ 993
Designated contracts | Interest Rate Contracts | VIE primary beneficiary
Derivative [Line Items]
Notional amount	653	693
Undesignated contracts | Interest Rate Contracts
Derivative [Line Items]
Notional amount	1,177	1,277
Duke Energy Carolinas | Interest Rate Contracts
Derivative [Line Items]
Notional amount	$ 400	$ 450
Duke Energy Carolinas | Commodity contracts | Natural gas (millions of dekatherms)
Derivative [Line Items]
Notional amount, volume (in millions of dekatherms) | Mcf	143	130
Duke Energy Carolinas | Undesignated contracts | Interest Rate Contracts
Derivative [Line Items]
Notional amount	$ 400	$ 450
Progress Energy | Interest Rate Contracts
Derivative [Line Items]
Notional amount	$ 750	$ 800
Progress Energy | Commodity contracts | Natural gas (millions of dekatherms)
Derivative [Line Items]
Notional amount, volume (in millions of dekatherms) | Mcf	156	160
Progress Energy | Undesignated contracts | Interest Rate Contracts
Derivative [Line Items]
Notional amount	$ 750	$ 800
Duke Energy Progress | Interest Rate Contracts
Derivative [Line Items]
Notional amount	$ 750	$ 250
Duke Energy Progress | Commodity contracts | Natural gas (millions of dekatherms)
Derivative [Line Items]
Notional amount, volume (in millions of dekatherms) | Mcf	156	160
Duke Energy Progress | Undesignated contracts | Interest Rate Contracts
Derivative [Line Items]
Notional amount	$ 750	$ 250
Duke Energy Florida | Interest Rate Contracts
Derivative [Line Items]
Notional amount		550
Duke Energy Florida | Undesignated contracts | Interest Rate Contracts
Derivative [Line Items]
Notional amount		550
Duke Energy Ohio | Interest Rate 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	4,126	1,887
Duke Energy Ohio | Undesignated contracts | Interest Rate Contracts
Derivative [Line Items]
Notional amount	$ 27	$ 27
Duke Energy Indiana | Commodity contracts | Electricity (GWh)(a)
Derivative [Line Items]
Notional amount, energy measure (in gigawatt-hours) | GWh	17,072	13,971
Duke Energy Indiana | Commodity contracts | Natural gas (millions of dekatherms)
Derivative [Line Items]
Notional amount, volume (in millions of dekatherms) | Mcf	2	3
Piedmont Natural Gas | Commodity contracts | Natural gas (millions of dekatherms)
Derivative [Line Items]
Notional amount, volume (in millions of dekatherms) | Mcf	382	411

Derivatives and Hedging (Locati

Derivatives and Hedging (Location and Fair Value Amounts of Derivatives Reflected in the Condensed Consolidated Balance Sheets) (Details) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	$ 86	$ 25
Location and fair value amounts of derivatives (Liability)	359	300
Current assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	60	24
Noncurrent assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	26	1
Current liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Liability)	84	118
Noncurrent liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Liability)	275	182
Commodity Contracts
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	83	18
Location and fair value amounts of derivatives (Liability)	257	223
Interest Rate Contracts
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	3	6
Location and fair value amounts of derivatives (Liability)	102	53
Equity Securities Contracts
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)		1
Location and fair value amounts of derivatives (Liability)		24
Not Designated as Hedging Instruments | Commodity Contracts | Current assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	57	17
Not Designated as Hedging Instruments | Commodity Contracts | Noncurrent assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	26	1
Not Designated as Hedging Instruments | Commodity Contracts | Current liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Liability)	26	67
Not Designated as Hedging Instruments | Commodity Contracts | Noncurrent liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Liability)	129	156
Not Designated as Hedging Instruments | Interest Rate Contracts | Current assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	3	6
Not Designated as Hedging Instruments | Interest Rate Contracts | Current liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Liability)	27	8
Not Designated as Hedging Instruments | Interest Rate Contracts | Noncurrent liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Liability)	5	5
Not Designated as Hedging Instruments | Equity Securities Contracts | Current assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)		1
Not Designated as Hedging Instruments | Equity Securities Contracts | Current liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Liability)		24
Designated as Hedging Instruments | Commodity Contracts | Current liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Liability)	17
Designated as Hedging Instruments | Commodity Contracts | Noncurrent liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Liability)	85
Designated as Hedging Instruments | Interest Rate Contracts | Current liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Liability)	14	19
Designated as Hedging Instruments | Interest Rate Contracts | Noncurrent liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Liability)	56	21
Duke Energy Carolinas
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	38
Location and fair value amounts of derivatives (Liability)	33	49
Duke Energy Carolinas | Current assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	24
Duke Energy Carolinas | Noncurrent assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	14
Duke Energy Carolinas | Current liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Liability)	29	39
Duke Energy Carolinas | Noncurrent liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Liability)	4	10
Duke Energy Carolinas | Commodity Contracts
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	38
Location and fair value amounts of derivatives (Liability)	16	43
Duke Energy Carolinas | Interest Rate Contracts
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Liability)	17	6
Duke Energy Carolinas | Not Designated as Hedging Instruments | Commodity Contracts | Current assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	24
Duke Energy Carolinas | Not Designated as Hedging Instruments | Commodity Contracts | Noncurrent assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	14
Duke Energy Carolinas | Not Designated as Hedging Instruments | Commodity Contracts | Current liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Liability)	12	33
Duke Energy Carolinas | Not Designated as Hedging Instruments | Commodity Contracts | Noncurrent liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Liability)	4	10
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 (Liability)	17	6
Progress Energy
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	33	7
Location and fair value amounts of derivatives (Liability)	36	88
Progress Energy | Current assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	21	7
Progress Energy | Noncurrent assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	12
Progress Energy | Current liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Liability)	9	51
Progress Energy | Noncurrent liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Liability)	27	37
Progress Energy | Commodity Contracts
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	30
Location and fair value amounts of derivatives (Liability)	27	63
Progress Energy | Interest Rate Contracts
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	3	6
Location and fair value amounts of derivatives (Liability)	9	1
Progress Energy | Equity Securities Contracts
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)		1
Location and fair value amounts of derivatives (Liability)		24
Progress Energy | Not Designated as Hedging Instruments | Commodity Contracts | Current assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	18
Progress Energy | Not Designated as Hedging Instruments | Commodity Contracts | Noncurrent assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	12
Progress Energy | Not Designated as Hedging Instruments | Commodity Contracts | Current liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Liability)		26
Progress Energy | Not Designated as Hedging Instruments | Commodity Contracts | Noncurrent liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Liability)	27	37
Progress Energy | Not Designated as Hedging Instruments | Interest Rate Contracts | Current assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	3	6
Progress Energy | Not Designated as Hedging Instruments | Interest Rate Contracts | Current liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Liability)	9	1
Progress Energy | Not Designated as Hedging Instruments | Equity Securities Contracts | Current assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)		1
Progress Energy | Not Designated as Hedging Instruments | Equity Securities Contracts | Current liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Liability)		24
Duke Energy Progress
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	33
Location and fair value amounts of derivatives (Liability)	20	49
Duke Energy Progress | Current assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	21
Duke Energy Progress | Noncurrent assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	12
Duke Energy Progress | Current liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Liability)	9	27
Duke Energy Progress | Noncurrent liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Liability)	11	22
Duke Energy Progress | Commodity Contracts
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	30
Location and fair value amounts of derivatives (Liability)	11	48
Duke Energy Progress | Interest Rate Contracts
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	3
Location and fair value amounts of derivatives (Liability)	9	1
Duke Energy Progress | Not Designated as Hedging Instruments | Commodity Contracts | Current assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	18
Duke Energy Progress | Not Designated as Hedging Instruments | Commodity Contracts | Noncurrent assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	12
Duke Energy Progress | Not Designated as Hedging Instruments | Commodity Contracts | Current liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Liability)		26
Duke Energy Progress | Not Designated as Hedging Instruments | Commodity Contracts | Noncurrent liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Liability)	11	22
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 (Asset)	3
Duke Energy Progress | Not Designated as Hedging Instruments | Interest Rate Contracts | Current liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Liability)	9	1
Duke Energy Florida
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)		7
Location and fair value amounts of derivatives (Liability)		24
Duke Energy Florida | Current assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)		7
Duke Energy Florida | Current liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Liability)		24
Duke Energy Florida | Interest Rate Contracts
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)		6
Duke Energy Florida | Equity Securities Contracts
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)		1
Location and fair value amounts of derivatives (Liability)		24
Duke Energy Florida | Not Designated as Hedging Instruments | Interest Rate Contracts | Current assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)		6
Duke Energy Florida | Not Designated as Hedging Instruments | Equity Securities Contracts | Current assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)		1
Duke Energy Florida | Not Designated as Hedging Instruments | Equity Securities Contracts | Current liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Liability)		24
Duke Energy Ohio
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	2	4
Location and fair value amounts of derivatives (Liability)	7	6
Duke Energy Ohio | Current assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	2	3
Duke Energy Ohio | Noncurrent assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)		1
Duke Energy Ohio | Current liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Liability)	2	1
Duke Energy Ohio | Noncurrent liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Liability)	5	5
Duke Energy Ohio | Commodity Contracts
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	2	4
Location and fair value amounts of derivatives (Liability)	1
Duke Energy Ohio | Interest Rate Contracts
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Liability)	6	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 (Asset)	2	3
Duke Energy Ohio | Not Designated as Hedging Instruments | Commodity Contracts | Noncurrent assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)		1
Duke Energy Ohio | Not Designated as Hedging Instruments | Commodity Contracts | Current liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Liability)	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 (Liability)	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 (Liability)	5	5
Duke Energy Indiana
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	8	13
Location and fair value amounts of derivatives (Liability)		1
Duke Energy Indiana | Current assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	8	13
Duke Energy Indiana | Current liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Liability)		1
Duke Energy Indiana | Commodity Contracts
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	8	13
Location and fair value amounts of derivatives (Liability)		1
Duke Energy Indiana | Not Designated as Hedging Instruments | Commodity Contracts | Current assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	8	13
Duke Energy Indiana | Not Designated as Hedging Instruments | Commodity Contracts | Current liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Liability)		1
Piedmont Natural Gas
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	6	1
Location and fair value amounts of derivatives (Liability)	111	117
Piedmont Natural Gas | Current assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	6	1
Piedmont Natural Gas | Current liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Liability)	13	7
Piedmont Natural Gas | Noncurrent liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Liability)	98	110
Piedmont Natural Gas | Commodity Contracts
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	6	1
Location and fair value amounts of derivatives (Liability)	111	117
Piedmont Natural Gas | Not Designated as Hedging Instruments | Commodity Contracts | Current assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	6	1
Piedmont Natural Gas | Not Designated as Hedging Instruments | Commodity Contracts | Current liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Liability)	13	7
Piedmont Natural Gas | Not Designated as Hedging Instruments | Commodity Contracts | Noncurrent liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Liability)	$ 98	$ 110

Derivatives and Hedging (Schedu

Derivatives and Hedging (Schedule of Offsetting Assets) (Details) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	$ 86	$ 25
Net amounts recognized on the Condensed Consolidated Balance Sheet	86	25
Current assets
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	60	24
Gross amounts offset	(1)	(1)
Net amounts recognized on the Condensed Consolidated Balance Sheet	59	23
Noncurrent assets
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	26	1
Gross amounts offset	(8)
Net amounts recognized on the Condensed Consolidated Balance Sheet	18	1
Duke Energy Carolinas
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	38
Net amounts recognized on the Condensed Consolidated Balance Sheet	38
Duke Energy Carolinas | Current assets
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	24
Net amounts recognized on the Condensed Consolidated Balance Sheet	24
Duke Energy Carolinas | Noncurrent assets
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	14
Net amounts recognized on the Condensed Consolidated Balance Sheet	14
Progress Energy
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	33	7
Net amounts recognized on the Condensed Consolidated Balance Sheet	33	7
Progress Energy | Current assets
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	21	7
Gross amounts offset		(1)
Net amounts recognized on the Condensed Consolidated Balance Sheet	21	6
Progress Energy | Noncurrent assets
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	12
Gross amounts offset	(8)
Net amounts recognized on the Condensed Consolidated Balance Sheet	4
Duke Energy Progress
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	33
Net amounts recognized on the Condensed Consolidated Balance Sheet	33
Duke Energy Progress | Current assets
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	21
Net amounts recognized on the Condensed Consolidated Balance Sheet	21
Duke Energy Progress | Noncurrent assets
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	12
Gross amounts offset	(8)
Net amounts recognized on the Condensed Consolidated Balance Sheet	4
Duke Energy Florida
Offsetting Derivative Assets [Abstract]
Gross amounts recognized		7
Net amounts recognized on the Condensed Consolidated Balance Sheet		7
Duke Energy Florida | Current assets
Offsetting Derivative Assets [Abstract]
Gross amounts recognized		7
Gross amounts offset		(1)
Net amounts recognized on the Condensed Consolidated Balance Sheet		6
Duke Energy Ohio
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	2	4
Duke Energy Ohio | Current assets
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	2	3
Net amounts recognized on the Condensed Consolidated Balance Sheet	2	3
Duke Energy Ohio | Noncurrent assets
Offsetting Derivative Assets [Abstract]
Gross amounts recognized		1
Net amounts recognized on the Condensed Consolidated Balance Sheet		1
Duke Energy Indiana
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	8	13
Net amounts recognized on the Condensed Consolidated Balance Sheet	8	13
Duke Energy Indiana | Current assets
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	8	13
Net amounts recognized on the Condensed Consolidated Balance Sheet	8	13
Piedmont Natural Gas
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	6	1
Net amounts recognized on the Condensed Consolidated Balance Sheet	6	1
Piedmont Natural Gas | Current assets
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	6	1
Net amounts recognized on the Condensed Consolidated Balance Sheet	$ 6	$ 1

Derivatives and Hedging (Sche_2

Derivatives and Hedging (Schedule of Offsetting Liabilities) (Details) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	$ 359	$ 300
Net amounts recognized on the Condensed Consolidated Balance Sheet	359	277
Current liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	84	118
Gross amounts offset	(1)	(24)
Net amounts recognized on the Condensed Consolidated Balance Sheet	83	94
Noncurrent liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	275	182
Gross amounts offset	(8)
Net amounts recognized on the Condensed Consolidated Balance Sheet	267	182
Duke Energy Carolinas
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	33	49
Net amounts recognized on the Condensed Consolidated Balance Sheet	33	49
Duke Energy Carolinas | Current liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	29	39
Net amounts recognized on the Condensed Consolidated Balance Sheet	29	39
Duke Energy Carolinas | Noncurrent liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	4	10
Net amounts recognized on the Condensed Consolidated Balance Sheet	4	10
Progress Energy
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	36	88
Net amounts recognized on the Condensed Consolidated Balance Sheet	36	65
Progress Energy | Current liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	9	51
Gross amounts offset		(24)
Net amounts recognized on the Condensed Consolidated Balance Sheet	9	27
Progress Energy | Noncurrent liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	27	37
Gross amounts offset	(8)
Net amounts recognized on the Condensed Consolidated Balance Sheet	19	37
Duke Energy Progress
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	20	49
Net amounts recognized on the Condensed Consolidated Balance Sheet	20	49
Duke Energy Progress | Current liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	9	27
Net amounts recognized on the Condensed Consolidated Balance Sheet	9	27
Duke Energy Progress | Noncurrent liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	11	22
Gross amounts offset	(8)
Net amounts recognized on the Condensed Consolidated Balance Sheet	3	22
Duke Energy Florida
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized		24
Net amounts recognized on the Condensed Consolidated Balance Sheet		1
Duke Energy Florida | Current liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized		24
Gross amounts offset		(24)
Duke Energy Ohio
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	7	6
Duke Energy Ohio | Current liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	2	1
Net amounts recognized on the Condensed Consolidated Balance Sheet	2	1
Duke Energy Ohio | Noncurrent liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	5	5
Net amounts recognized on the Condensed Consolidated Balance Sheet	5	5
Duke Energy Indiana
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized		1
Net amounts recognized on the Condensed Consolidated Balance Sheet		1
Duke Energy Indiana | Current liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized		1
Net amounts recognized on the Condensed Consolidated Balance Sheet		1
Piedmont Natural Gas
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	111	117
Net amounts recognized on the Condensed Consolidated Balance Sheet	111	117
Piedmont Natural Gas | Current liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	13	7
Net amounts recognized on the Condensed Consolidated Balance Sheet	13	7
Piedmont Natural Gas | Noncurrent liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	98	110
Net amounts recognized on the Condensed Consolidated Balance Sheet	$ 98	$ 110

Derivatives and Hedging (Deriva

Derivatives and Hedging (Derivative Instruments with Credit-Risk Related Contingent Features and Cash Collateral) (Details) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Schedule of Information Regarding Derivative Instruments That Contain Credit-Risk Related Contingent Features
Aggregate fair value of derivatives in a net liability position	$ 20	$ 79
Fair value of collateral already posted	0	0
Additional cash collateral or letters of credit in the event credit-risk-related contingent features were triggered	20	79
Duke Energy Carolinas
Schedule of Information Regarding Derivative Instruments That Contain Credit-Risk Related Contingent Features
Aggregate fair value of derivatives in a net liability position	9	35
Fair value of collateral already posted	0	0
Additional cash collateral or letters of credit in the event credit-risk-related contingent features were triggered	9	35
Progress Energy
Schedule of Information Regarding Derivative Instruments That Contain Credit-Risk Related Contingent Features
Aggregate fair value of derivatives in a net liability position	11	44
Fair value of collateral already posted	0	0
Additional cash collateral or letters of credit in the event credit-risk-related contingent features were triggered	11	44
Duke Energy Progress
Schedule of Information Regarding Derivative Instruments That Contain Credit-Risk Related Contingent Features
Aggregate fair value of derivatives in a net liability position	11	44
Fair value of collateral already posted	0	0
Additional cash collateral or letters of credit in the event credit-risk-related contingent features were triggered	$ 11	$ 44

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	Sep. 30, 2020	Dec. 31, 2019
Debt Securities, Available-for-sale
Estimated Fair Value	$ 2,532
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract]
Unrealized Holding Gains	3,662	$ 3,675
Unrealized Holding Losses	106	57
Estimated Fair Value	8,914	8,562
Duke Energy Carolinas
Debt Securities, Available-for-sale
Estimated Fair Value	1,232
Progress Energy
Debt Securities, Available-for-sale
Estimated Fair Value	1,045
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract]
Unrealized Holding Gains	1,482	1,655
Unrealized Holding Losses	52	47
Estimated Fair Value	4,027	3,883
Duke Energy Progress
Debt Securities, Available-for-sale
Estimated Fair Value	992
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract]
Unrealized Holding Gains	1,409	1,300
Unrealized Holding Losses	52	21
Estimated Fair Value	3,200	3,053
Duke Energy Florida
Debt Securities, Available-for-sale
Estimated Fair Value	53
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract]
Unrealized Holding Gains	73	355
Unrealized Holding Losses		26
Estimated Fair Value	723	787
Duke Energy Indiana
Equity Securities, FV-NI
Equity Securities, FV-NI, Accumulated Unrealized Gain	45	43
Equity securities, FV-NI	84	81
Debt Securities, Available-for-sale
Estimated Fair Value	45
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract]
Unrealized Holding Gains	46	44
Unrealized Holding Losses	1
Estimated Fair Value	130	125
NDTF
Available-for-sale Securities
Cash and cash equivalents	687	101
Equity Securities, FV-NI
Equity Securities, FV-NI, Accumulated Unrealized Gain	3,436	3,523
Equity Securities, FV-NI, Accumulated Unrealized Loss	103	55
Equity securities, FV-NI	5,459	5,661
Debt Securities, Available-for-sale
Estimated Fair Value	2,224	2,368
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract]
Unrealized Holding Gains	3,587	3,609
Unrealized Holding Losses	105	57
Estimated Fair Value	8,370	8,130
NDTF | Duke Energy Carolinas
Available-for-sale Securities
Cash and cash equivalents	42	21
Equity Securities, FV-NI
Equity Securities, FV-NI, Accumulated Unrealized Gain	2,027	1,914
Equity Securities, FV-NI, Accumulated Unrealized Loss	52	8
Equity securities, FV-NI	3,229	3,154
Debt Securities, Available-for-sale
Estimated Fair Value	1,232	1,172
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract]
Unrealized Holding Gains	2,109	1,957
Unrealized Holding Losses	53	10
Estimated Fair Value	4,503	4,347
NDTF | Progress Energy
Available-for-sale Securities
Cash and cash equivalents	645	80
Equity Securities, FV-NI
Equity Securities, FV-NI, Accumulated Unrealized Gain	1,409	1,609
Equity Securities, FV-NI, Accumulated Unrealized Loss	51	47
Equity securities, FV-NI	2,230	2,507
Debt Securities, Available-for-sale
Estimated Fair Value	992	1,196
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract]
Unrealized Holding Gains	1,478	1,652
Unrealized Holding Losses	52	47
Estimated Fair Value	3,867	3,783
NDTF | Duke Energy Progress
Available-for-sale Securities
Cash and cash equivalents	57	53
Equity Securities, FV-NI
Equity Securities, FV-NI, Accumulated Unrealized Gain	1,340	1,258
Equity Securities, FV-NI, Accumulated Unrealized Loss	51	21
Equity securities, FV-NI	2,150	2,077
Debt Securities, Available-for-sale
Estimated Fair Value	992	921
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract]
Unrealized Holding Gains	1,409	1,300
Unrealized Holding Losses	52	21
Estimated Fair Value	3,199	3,051
NDTF | Duke Energy Florida
Available-for-sale Securities
Cash and cash equivalents	588	27
Equity Securities, FV-NI
Equity Securities, FV-NI, Accumulated Unrealized Gain	69	351
Equity Securities, FV-NI, Accumulated Unrealized Loss		26
Equity securities, FV-NI	80	430
Debt Securities, Available-for-sale
Estimated Fair Value		275
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract]
Unrealized Holding Gains	69	352
Unrealized Holding Losses		26
Estimated Fair Value	668	732
Other Investments
Available-for-sale Securities
Cash and cash equivalents	110	52
Equity Securities, FV-NI
Equity Securities, FV-NI, Accumulated Unrealized Gain	60	57
Equity securities, FV-NI	126	122
Debt Securities, Available-for-sale
Estimated Fair Value	308	258
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract]
Unrealized Holding Gains	75	66
Unrealized Holding Losses	1
Estimated Fair Value	544	432
Other Investments | Progress Energy
Available-for-sale Securities
Cash and cash equivalents	107	49
Debt Securities, Available-for-sale
Estimated Fair Value	53	51
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract]
Unrealized Holding Gains	4	3
Estimated Fair Value	160	100
Other Investments | Duke Energy Progress
Available-for-sale Securities
Cash and cash equivalents	1	2
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract]
Estimated Fair Value	1	2
Other Investments | Duke Energy Florida
Available-for-sale Securities
Cash and cash equivalents	2	4
Debt Securities, Available-for-sale
Estimated Fair Value	53	51
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract]
Unrealized Holding Gains	4	3
Estimated Fair Value	55	55
Other Investments | Duke Energy Indiana
Available-for-sale Securities
Cash and cash equivalents	1
Equity Securities, FV-NI
Equity securities, FV-NI	84	81
Debt Securities, Available-for-sale
Estimated Fair Value	45	44
Corporate debt securities | Duke Energy Indiana
Debt Securities, Available-for-sale
Estimated Fair Value	3	6
Corporate debt securities | NDTF
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	65	37
Gross Unrealized Holding Losses	1	1
Estimated Fair Value	789	603
Corporate debt securities | NDTF | Duke Energy Carolinas
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	42	21
Gross Unrealized Holding Losses	1	1
Estimated Fair Value	507	361
Corporate debt securities | NDTF | Progress Energy
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	23	16
Estimated Fair Value	282	242
Corporate debt securities | NDTF | Duke Energy Progress
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	23	16
Estimated Fair Value	282	242
Corporate debt securities | Other Investments
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	8	3
Estimated Fair Value	129	67
Municipal bonds | Duke Energy Indiana
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	1	1
Gross Unrealized Holding Losses	1
Estimated Fair Value	39	36
Municipal bonds | NDTF
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	19	13
Gross Unrealized Holding Losses	1
Estimated Fair Value	407	368
Municipal bonds | NDTF | Duke Energy Carolinas
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	5	3
Estimated Fair Value	118	96
Municipal bonds | NDTF | Progress Energy
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	14	10
Gross Unrealized Holding Losses	1
Estimated Fair Value	289	272
Municipal bonds | NDTF | Duke Energy Progress
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	14	10
Gross Unrealized Holding Losses	1
Estimated Fair Value	289	272
Municipal bonds | Other Investments
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	6	4
Gross Unrealized Holding Losses	1
Estimated Fair Value	114	94
Municipal bonds | Other Investments | Progress Energy
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	4	3
Estimated Fair Value	53	51
Municipal bonds | Other Investments | Duke Energy Florida
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	4	3
Estimated Fair Value	53	51
U.S. government bonds | Duke Energy Indiana
Debt Securities, Available-for-sale
Estimated Fair Value	3	2
U.S. government bonds | NDTF
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	58	33
Gross Unrealized Holding Losses		1
Estimated Fair Value	843	1,256
U.S. government bonds | NDTF | Duke Energy Carolinas
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	28	16
Gross Unrealized Holding Losses		1
Estimated Fair Value	428	578
U.S. government bonds | NDTF | Progress Energy
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	30	17
Estimated Fair Value	415	678
U.S. government bonds | NDTF | Duke Energy Progress
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	30	16
Estimated Fair Value	415	403
U.S. government bonds | NDTF | Duke Energy Florida
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains		1
Estimated Fair Value		275
U.S. government bonds | Other Investments
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	1	2
Estimated Fair Value	21	41
Other debt securities | NDTF
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	9	3
Estimated Fair Value	185	141
Other debt securities | NDTF | Duke Energy Carolinas
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	7	3
Estimated Fair Value	179	137
Other debt securities | NDTF | Progress Energy
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	2
Estimated Fair Value	6	4
Other debt securities | NDTF | Duke Energy Progress
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	2
Estimated Fair Value	6	4
Other debt securities | Other Investments
Debt Securities, Available-for-sale
Estimated Fair Value	$ 44	$ 56

Investments in Debt and Equit_4

Investments in Debt and Equity Securities (Realized Gains and Losses) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
FV-NI:
Realized gains	$ 13	$ 60	$ 338	$ 161
Realized losses	16	43	148	136
AFS:
Realized gains	26	53	73	110
Realized losses	19	36	38	83
Duke Energy Carolinas
FV-NI:
Realized gains	10	34	46	101
Realized losses	12	26	82	95
AFS:
Realized gains	20	21	50	46
Realized losses	17	13	30	34
Progress Energy
FV-NI:
Realized gains	3	26	292	60
Realized losses	4	17	66	41
AFS:
Realized gains	6	31	17	62
Realized losses	2	23	7	49
Duke Energy Progress
FV-NI:
Realized gains	3	10	43	27
Realized losses	4	9	51	24
AFS:
Realized gains	6	2	17	4
Realized losses	$ 2		7	2
Duke Energy Florida
FV-NI:
Realized gains		16	249	33
Realized losses		8	$ 15	17
AFS:
Realized gains		29		58
Realized losses		$ 23		$ 47

Investments in Debt and Equit_5

Investments in Debt and Equity Securities (Maturities) (Details) $ in Millions	Sep. 30, 2020USD ($)
Debt Securities, Available-for-sale [Line Items]
Due in one year or less	$ 53
Due after one through five years	558
Due after five through 10 years	608
Due after 10 years	1,313
Total	2,532
Duke Energy Carolinas
Debt Securities, Available-for-sale [Line Items]
Due in one year or less	13
Due after one through five years	247
Due after five through 10 years	278
Due after 10 years	694
Total	1,232
Progress Energy
Debt Securities, Available-for-sale [Line Items]
Due in one year or less	15
Due after one through five years	256
Due after five through 10 years	232
Due after 10 years	542
Total	1,045
Duke Energy Progress
Debt Securities, Available-for-sale [Line Items]
Due in one year or less	14
Due after one through five years	246
Due after five through 10 years	224
Due after 10 years	508
Total	992
Duke Energy Florida
Debt Securities, Available-for-sale [Line Items]
Due in one year or less	1
Due after one through five years	10
Due after five through 10 years	8
Due after 10 years	34
Total	53
Duke Energy Indiana
Debt Securities, Available-for-sale [Line Items]
Due in one year or less	4
Due after one through five years	16
Due after five through 10 years	9
Due after 10 years	16
Total	$ 45

Fair Value Measurements (Fair V

Fair Value Measurements (Fair Value Measurement Amounts for Assets and Liabilities) (Details) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt securities, available-for-sale	$ 2,532
Derivative assets	86	$ 25
Total assets	9,000	8,610
Derivative liabilities	(359)	(277)
Net assets (liabilities)	8,641	8,310
Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative assets	5	3
Total assets	6,722	6,675
Derivative liabilities	(1)	(15)
Net assets (liabilities)	6,721	6,660
Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative assets	71	7
Total assets	2,222	1,869
Derivative liabilities	(145)	(145)
Net assets (liabilities)	2,077	1,701
Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative assets	10	15
Total assets	10	15
Derivative liabilities	(213)	(117)
Net assets (liabilities)	(203)	(102)
Not Categorized
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total assets	46	51
Net assets (liabilities)	46	51
NDTF
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	687	101
Equity securities, FV-NI	5,459	5,661
Debt securities, available-for-sale	2,224	2,368
NDTF | Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	687	101
Debt securities, available-for-sale	363	725
NDTF | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt securities, available-for-sale	1,861	1,643
NDTF equity securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity securities, FV-NI	5,459	5,684
NDTF equity securities | Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity securities, FV-NI	5,413	5,633
NDTF equity securities | Not Categorized
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity securities, FV-NI	46	51
Other Investments
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	110	52
Equity securities, FV-NI	126	122
Debt securities, available-for-sale	308	258
Other Investments | Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	110	52
Equity securities, FV-NI	126	122
Debt securities, available-for-sale	18	39
Other Investments | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt securities, available-for-sale	290	219
NDTF equity security contracts
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative liabilities		(23)
NDTF equity security contracts | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative liabilities		(23)
Duke Energy Carolinas
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt securities, available-for-sale	1,232
Derivative assets	38
Total assets	4,541	4,347
Derivative liabilities	(33)	(49)
Net assets (liabilities)	4,508	4,298
Duke Energy Carolinas | Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total assets	3,356	3,330
Net assets (liabilities)	3,356	3,330
Duke Energy Carolinas | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative assets	38
Total assets	1,139	966
Derivative liabilities	(33)	(49)
Net assets (liabilities)	1,106	917
Duke Energy Carolinas | Not Categorized
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total assets	46	51
Net assets (liabilities)	46	51
Duke Energy Carolinas | NDTF
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	42	21
Equity securities, FV-NI	3,229	3,154
Debt securities, available-for-sale	1,232	1,172
Duke Energy Carolinas | NDTF | Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	42	21
Debt securities, available-for-sale	131	206
Duke Energy Carolinas | NDTF | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt securities, available-for-sale	1,101	966
Duke Energy Carolinas | NDTF equity securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity securities, FV-NI	3,229	3,154
Duke Energy Carolinas | NDTF equity securities | Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity securities, FV-NI	3,183	3,103
Duke Energy Carolinas | NDTF equity securities | Not Categorized
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity securities, FV-NI	46	51
Progress Energy
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt securities, available-for-sale	1,045
Derivative assets	33	7
Total assets	4,060	3,913
Derivative liabilities	(36)	(65)
Net assets (liabilities)	4,024	3,825
Progress Energy | Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total assets	3,214	3,178
Net assets (liabilities)	3,214	3,178
Progress Energy | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative assets	33	7
Total assets	846	735
Derivative liabilities	(36)	(65)
Net assets (liabilities)	810	647
Progress Energy | NDTF
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	645	80
Equity securities, FV-NI	2,230	2,507
Debt securities, available-for-sale	992	1,196
Progress Energy | NDTF | Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	645	80
Debt securities, available-for-sale	232	519
Progress Energy | NDTF | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt securities, available-for-sale	760	677
Progress Energy | NDTF equity securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity securities, FV-NI	2,230	2,530
Progress Energy | NDTF equity securities | Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity securities, FV-NI	2,230	2,530
Progress Energy | Other Investments
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	107	49
Debt securities, available-for-sale	53	51
Progress Energy | Other Investments | Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	107	49
Progress Energy | Other Investments | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt securities, available-for-sale	53	51
Progress Energy | NDTF equity security contracts
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative liabilities		(23)
Progress Energy | NDTF equity security contracts | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative liabilities		(23)
Duke Energy Progress
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt securities, available-for-sale	992
Derivative assets	33
Total assets	3,233	3,053
Derivative liabilities	(20)	(49)
Net assets (liabilities)	3,213	3,004
Duke Energy Progress | Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total assets	2,440	2,376
Net assets (liabilities)	2,440	2,376
Duke Energy Progress | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative assets	33
Total assets	793	677
Derivative liabilities	(20)	(49)
Net assets (liabilities)	773	628
Duke Energy Progress | NDTF
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	57	53
Equity securities, FV-NI	2,150	2,077
Debt securities, available-for-sale	992	921
Duke Energy Progress | NDTF | Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	57	53
Debt securities, available-for-sale	232	244
Duke Energy Progress | NDTF | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt securities, available-for-sale	760	677
Duke Energy Progress | NDTF equity securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity securities, FV-NI	2,150	2,077
Duke Energy Progress | NDTF equity securities | Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity securities, FV-NI	2,150	2,077
Duke Energy Progress | Other Investments
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	1	2
Duke Energy Progress | Other Investments | Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	1	2
Duke Energy Florida
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt securities, available-for-sale	53
Derivative assets		7
Total assets	723	817
Derivative liabilities		(1)
Net assets (liabilities)	723	793
Duke Energy Florida | Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total assets	670	759
Net assets (liabilities)	670	759
Duke Energy Florida | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative assets		7
Total assets	53	58
Derivative liabilities		(1)
Net assets (liabilities)	53	34
Duke Energy Florida | NDTF
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	588	27
Equity securities, FV-NI	80	430
Debt securities, available-for-sale		275
Duke Energy Florida | NDTF | Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	588	27
Debt securities, available-for-sale		275
Duke Energy Florida | NDTF | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	0
Duke Energy Florida | NDTF equity securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity securities, FV-NI	80	453
Duke Energy Florida | NDTF equity securities | Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity securities, FV-NI	80	453
Duke Energy Florida | Other Investments
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	2	4
Debt securities, available-for-sale	53	51
Duke Energy Florida | Other Investments | Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	2	4
Duke Energy Florida | Other Investments | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt securities, available-for-sale	53	51
Duke Energy Florida | NDTF equity security contracts
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative liabilities		(23)
Duke Energy Florida | NDTF equity security contracts | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative liabilities		(23)
Duke Energy Indiana
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity securities, FV-NI	84	81
Debt securities, available-for-sale	45
Derivative assets	8	13
Total assets	138	138
Derivative liabilities		(1)
Net assets (liabilities)	138	137
Duke Energy Indiana | Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative assets		2
Total assets	85	83
Derivative liabilities	0	(1)
Net assets (liabilities)	85	82
Duke Energy Indiana | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total assets	45	44
Net assets (liabilities)	45	44
Duke Energy Indiana | Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative assets	8	11
Total assets	8	11
Net assets (liabilities)	8	11
Duke Energy Indiana | Other Investments
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	1
Equity securities, FV-NI	84	81
Debt securities, available-for-sale	45	44
Duke Energy Indiana | Other Investments | Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	1
Equity securities, FV-NI	84	81
Duke Energy Indiana | Other Investments | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt securities, available-for-sale	45	44
Piedmont Natural Gas
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative assets	6	1
Derivative liabilities	(111)	(117)
Net assets (liabilities)	(105)	(116)
Piedmont Natural Gas | Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative assets	6	1
Net assets (liabilities)	6	1
Piedmont Natural Gas | Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative liabilities	(111)	(117)
Net assets (liabilities)	$ (111)	$ (117)

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	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Derivatives (net)
Balance at beginning of period	$ (92)	$ (79)	$ (102)	$ (113)
Total pretax realized or unrealized gains included in comprehensive income	(102)		(102)
Purchases, sales, issuances and settlements:
Purchases			14	38
Settlements	(3)	(9)	(18)	(32)
Total (losses) gains included on the Condensed Consolidated Balance Sheet	(6)	(2)	5	17
Balance at end of period	(203)	(90)	(203)	(90)
Duke Energy Indiana
Derivatives (net)
Balance at beginning of period	10	28	11	22
Purchases, sales, issuances and settlements:
Purchases			10	29
Settlements	(3)	(7)	(13)	(26)
Total (losses) gains included on the Condensed Consolidated Balance Sheet	1	(5)	0	(9)
Balance at end of period	8	16	8	16
Piedmont Natural Gas
Derivatives (net)
Balance at beginning of period	(105)	(114)	(117)	(141)
Purchases, sales, issuances and settlements:
Total (losses) gains and settlements	(6)	3	6	30
Balance at end of period	$ (111)	$ (111)	$ (111)	$ (111)

Fair Value Measurements (Quanti

Fair Value Measurements (Quantitative Level 3 Fair Value Disclosures) (Details) $ in Millions	Sep. 30, 2020USD ($)$ / MWh$ / MMBTU	Jun. 30, 2020USD ($)	Dec. 31, 2019USD ($)$ / MWh$ / MMBTU	Sep. 30, 2019USD ($)	Jun. 30, 2019USD ($)	Dec. 31, 2018USD ($)
Fair Value Measurement Inputs and Valuation Techniques
Net derivative asset (liability) | $	$ (203)	$ (92)	$ (102)	$ (90)	$ (79)	$ (113)
Electricity contracts | RTO auction pricing
Fair Value Measurement Inputs and Valuation Techniques
Net derivative asset (liability) | $	$ (102)
Electricity contracts | RTO auction pricing | Minimum
Fair Value Measurement Inputs and Valuation Techniques
Input measurements (in usd per MWh and usd per MMBtu)	14.92
Electricity contracts | RTO auction pricing | Maximum
Fair Value Measurement Inputs and Valuation Techniques
Input measurements (in usd per MWh and usd per MMBtu)	151.18
Electricity contracts | RTO auction pricing | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques
Input measurements (in usd per MWh and usd per MMBtu)	29.63
Duke Energy Ohio | FTRs | RTO auction pricing
Fair Value Measurement Inputs and Valuation Techniques
Net derivative asset (liability) | $	$ 2		$ 4
Duke Energy Ohio | FTRs | RTO auction pricing | Minimum
Fair Value Measurement Inputs and Valuation Techniques
Input measurements (in usd per MWh and usd per MMBtu)	0		0.59
Duke Energy Ohio | FTRs | RTO auction pricing | Maximum
Fair Value Measurement Inputs and Valuation Techniques
Input measurements (in usd per MWh and usd per MMBtu)	1.90		3.47
Duke Energy Ohio | FTRs | RTO auction pricing | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques
Input measurements (in usd per MWh and usd per MMBtu)	0.64		2.07
Duke Energy Indiana
Fair Value Measurement Inputs and Valuation Techniques
Net derivative asset (liability) | $	$ 8	10	$ 11	16	28	22
Duke Energy Indiana | FTRs | RTO auction pricing
Fair Value Measurement Inputs and Valuation Techniques
Net derivative asset (liability) | $	$ 8		$ 11
Duke Energy Indiana | FTRs | RTO auction pricing | Minimum
Fair Value Measurement Inputs and Valuation Techniques
Input measurements (in usd per MWh and usd per MMBtu)	(1.03)		(0.66)
Duke Energy Indiana | FTRs | RTO auction pricing | Maximum
Fair Value Measurement Inputs and Valuation Techniques
Input measurements (in usd per MWh and usd per MMBtu)	6.10		9.24
Duke Energy Indiana | FTRs | RTO auction pricing | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques
Input measurements (in usd per MWh and usd per MMBtu)	0.74		1.15
Piedmont Natural Gas
Fair Value Measurement Inputs and Valuation Techniques
Net derivative asset (liability) | $	$ (111)	$ (105)	$ (117)	$ (111)	$ (114)	$ (141)
Piedmont Natural Gas | Electricity and natural gas contracts | Discounted cash flow
Fair Value Measurement Inputs and Valuation Techniques
Net derivative asset (liability) | $	$ (111)		$ (117)
Piedmont Natural Gas | Electricity and natural gas contracts | Discounted cash flow | Minimum
Fair Value Measurement Inputs and Valuation Techniques
Input measurements (in usd per MWh and usd per MMBtu) | $ / MMBTU	1.81		1.59
Piedmont Natural Gas | Electricity and natural gas contracts | Discounted cash flow | Maximum
Fair Value Measurement Inputs and Valuation Techniques
Input measurements (in usd per MWh and usd per MMBtu) | $ / MMBTU	2.50		2.46
Piedmont Natural Gas | Electricity and natural gas contracts | Discounted cash flow | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques
Input measurements (in usd per MWh and usd per MMBtu) | $ / MMBTU	2.11		1.91

Fair Value Measurements (Other

Fair Value Measurements (Other Fair Value Disclosure) (Details) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, book value	$ 60,718	$ 58,126
Long-term debt, fair value	69,503	63,062
Piedmont Natural Gas and Progress Energy
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Unamortized debt discount (premium), net	1,400	1,500
Duke Energy Carolinas
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, book value	12,548	11,900
Long-term debt, fair value	15,165	13,516
Progress Energy
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, book value	19,865	19,634
Long-term debt, fair value	23,825	22,291
Duke Energy Progress
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, book value	9,358	9,058
Long-term debt, fair value	10,808	9,934
Duke Energy Florida
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, book value	7,917	7,987
Long-term debt, fair value	9,684	9,131
Duke Energy Ohio
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, book value	3,089	2,619
Long-term debt, fair value	3,619	2,964
Duke Energy Indiana
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, book value	4,104	4,057
Long-term debt, fair value	5,140	4,800
Piedmont Natural Gas
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, book value	2,780	2,384
Long-term debt, fair value	$ 3,276	$ 2,642

Variable Interest Entities (Nar

Variable Interest Entities (Narrative) (Details) - USD ($)	Mar. 31, 2018	Sep. 30, 2020	Dec. 31, 2019
FES
Variable Interest Entities [Line Items]
Power participation ratio	4.85%
VIE primary beneficiary
Variable Interest Entities [Line Items]
Variable interest entity, financial or other support, amount		$ 0	$ 0
VIE primary beneficiary | CRC
Variable Interest Entities [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
VIE not primary beneficiary | OVEC
Variable Interest Entities [Line Items]
Variable interest entity ownership interest		9.00%

Variable Interest Entities (Sch

Variable Interest Entities (Schedule of Accounts Receivable Securitizations) (Details) - USD ($)	Sep. 30, 2020	Dec. 31, 2019
Variable Interest Entities [Line Items]
Long-Term Debt	$ 56,049,000,000	$ 54,985,000,000
Duke Energy Carolinas
Variable Interest Entities [Line Items]
Long-Term Debt	11,497,000,000	11,142,000,000
Duke Energy Progress
Variable Interest Entities [Line Items]
Long-Term Debt	8,605,000,000	7,902,000,000
Duke Energy Florida
Variable Interest Entities [Line Items]
Long-Term Debt	7,294,000,000	7,416,000,000
CRC | VIE primary beneficiary
Variable Interest Entities [Line Items]
Facility size	350,000,000
Long-Term Debt	350,000,000	350,000,000
Accounts receivable from securitization	479,000,000	522,000,000
DERF | Duke Energy Carolinas | VIE primary beneficiary
Variable Interest Entities [Line Items]
Facility size	475,000,000
Long-Term Debt	475,000,000	474,000,000
Accounts receivable from securitization	770,000,000	642,000,000
DEPR | Duke Energy Progress | VIE primary beneficiary
Variable Interest Entities [Line Items]
Facility size	350,000,000
Long-Term Debt	350,000,000	325,000,000
Accounts receivable from securitization	559,000,000	489,000,000
DEFR | Duke Energy Florida | VIE primary beneficiary
Variable Interest Entities [Line Items]
Facility size	250,000,000
Long-Term Debt	250,000,000	250,000,000
Accounts receivable from securitization	$ 506,000,000	$ 336,000,000

Variable Interest Entities (S_2

Variable Interest Entities (Schedule of Consolidated VIEs) (Details) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Variable Interest Entities [Line Items]
Regulatory Assets: Current	$ 1,637	$ 1,796
Current Assets: Other	505	764
Other Noncurrent Assets: Regulatory assets	13,264	13,222
Property, Plant and Equipment: Cost	153,916	147,654
Accumulated depreciation and amortization	(48,185)	(45,773)
Other Noncurrent Assets: Other	3,539	3,289
Current Liabilities: Other	2,829	2,367
Current maturities of long-term debt	4,669	3,141
Long-Term Debt	56,049	54,985
Other Noncurrent Liabilities: AROs	12,912	12,437
Other Noncurrent Liabilities: Other	1,773	1,581
Duke Energy Florida
Variable Interest Entities [Line Items]
Regulatory Assets: Current	303	419
Current Assets: Other	25	58
Other Noncurrent Assets: Regulatory assets	1,821	2,194
Property, Plant and Equipment: Cost	21,662	20,457
Accumulated depreciation and amortization	(5,452)	(5,236)
Other Noncurrent Assets: Other	341	311
Current Liabilities: Other	359	415
Current maturities of long-term debt	623	571
Long-Term Debt	7,294	7,416
Other Noncurrent Liabilities: AROs	555	578
Other Noncurrent Liabilities: Other	205	136
DEFPF | Duke Energy Florida | VIE primary beneficiary
Variable Interest Entities [Line Items]
Receivables of VIEs	6	5
Regulatory Assets: Current	53	52
Current Assets: Other	16	39
Other Noncurrent Assets: Regulatory assets	951	989
Current Liabilities: Other	2	10
Current maturities of long-term debt	55	54
Long-Term Debt	1,001	1,057
Commercial Renewables | VIE primary beneficiary
Variable Interest Entities [Line Items]
Current Assets: Other	319	203
Property, Plant and Equipment: Cost	6,239	5,747
Accumulated depreciation and amortization	(1,200)	(1,041)
Other Noncurrent Assets: Other	79	106
Current maturities of long-term debt	161	162
Long-Term Debt	1,452	1,541
Other Noncurrent Liabilities: AROs	150	127
Other Noncurrent Liabilities: Other	$ 342	$ 228

Variable Interest Entities (S_3

Variable Interest Entities (Schedule of Non-Consolidated VIEs) (Details) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Variable Interest Entities [Line Items]
Investments in equity method unconsolidated affiliates	$ 924	$ 1,936
Total Assets	161,409	158,838
Taxes accrued	768	392
Current Liabilities: Other	2,829	2,367
Deferred income taxes	9,170	8,878
Other Noncurrent Liabilities: Other	1,773	1,581
VIE not primary beneficiary
Variable Interest Entities [Line Items]
Receivables from affiliated companies	(1)	(1)
Other current assets	413
Investments in equity method unconsolidated affiliates	488	1,479
Deferred tax asset	26
Total Assets	926	1,478
Taxes accrued		(1)
Current Liabilities: Other	930	4
Deferred income taxes		59
Other Noncurrent Liabilities: Other	29	11
Total liabilities	959	73
Net assets	(33)	1,405
Duke Energy Ohio
Variable Interest Entities [Line Items]
Total Assets	9,749	9,338
Taxes accrued	193	219
Current Liabilities: Other	73	75
Deferred income taxes	965	922
Other Noncurrent Liabilities: Other	100	94
Duke Energy Ohio | VIE not primary beneficiary
Variable Interest Entities [Line Items]
Receivables from affiliated companies	45	64
Total Assets	45	64
Net assets	45	64
Duke Energy Indiana
Variable Interest Entities [Line Items]
Total Assets	13,914	13,276
Taxes accrued	110	49
Current Liabilities: Other	98	112
Deferred income taxes	1,179	1,150
Other Noncurrent Liabilities: Other	56	18
Duke Energy Indiana | VIE not primary beneficiary
Variable Interest Entities [Line Items]
Receivables from affiliated companies	74	77
Total Assets	74	77
Net assets	74	77
Pipeline Investments | VIE not primary beneficiary
Variable Interest Entities [Line Items]
Other current assets	413
Investments in equity method unconsolidated affiliates		1,179
Deferred tax asset	26
Total Assets	439	1,179
Taxes accrued		(1)
Current Liabilities: Other	927
Deferred income taxes		59
Other Noncurrent Liabilities: Other	19
Total liabilities	946	58
Net assets	(507)	1,121
Commercial Renewables | VIE not primary beneficiary
Variable Interest Entities [Line Items]
Receivables from affiliated companies	(1)	(1)
Investments in equity method unconsolidated affiliates	487	300
Total Assets	486	299
Net assets	486	299
Other VIEs | VIE not primary beneficiary
Variable Interest Entities [Line Items]
Investments in equity method unconsolidated affiliates	1
Total Assets	1
Current Liabilities: Other	3	4
Other Noncurrent Liabilities: Other	10	11
Total liabilities	13	15
Net assets	$ (12)	$ (15)

Variable Interest Entities (Pip

Variable Interest Entities (Pipeline Investments) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Variable Interest Entities [Line Items]
Net (Loss) Income	$ (80)	$ 50	$ (2,004)	$ 137
Investments in joint ventures	924		924		$ 1,936
VIE not primary beneficiary
Variable Interest Entities [Line Items]
Investments in joint ventures	$ 488		$ 488		1,479
ACP
Variable Interest Entities [Line Items]
Ownership percentage	47.00%		47.00%
ACP | VIE not primary beneficiary
Variable Interest Entities [Line Items]
Net (Loss) Income	$ (163)	$ 65	$ (4,505)	$ 178
Investments in joint ventures	$ (927)		$ (927)		1,179
Constitution
Variable Interest Entities [Line Items]
Ownership percentage	24.00%		24.00%
Pipeline Investments | VIE not primary beneficiary
Variable Interest Entities [Line Items]
Investments in joint ventures	$ (927)		$ (927)		$ 1,179

Variable Interest Entities (Rec

Variable Interest Entities (Receivables Sold) (Details) - VIE not primary beneficiary - CRC - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Duke Energy Ohio
Variable Interest Entities [Line Items]
Receivables sold	$ 226	$ 253
Less: Retained interests	45	64
Net receivables sold	181	189
Duke Energy Indiana
Variable Interest Entities [Line Items]
Receivables sold	310	307
Less: Retained interests	74	77
Net receivables sold	$ 236	$ 230

Variable Interest Entities (Sal

Variable Interest Entities (Sales and Cash Flows) (Details) - VIE not primary beneficiary - CRC - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Duke Energy Ohio
Variable Interest Entities [Line Items]
Receivables sold	$ 462	$ 479	$ 1,428	$ 1,483
Loss recognized on sale	2	4	8	11
Cash proceeds from receivables sold	449	471	1,439	1,516
Collection fees received	1		1	1
Return received on retained interests	1	1	3	5
Duke Energy Indiana
Variable Interest Entities [Line Items]
Receivables sold	717	762	1,947	2,172
Loss recognized on sale	3	4	9	13
Cash proceeds from receivables sold	689	762	1,941	2,200
Collection fees received			1	1
Return received on retained interests	$ 1	$ 2	$ 4	$ 7

Revenue (Remaining Performance

Revenue (Remaining Performance Obligations) (Details) $ in Millions	Sep. 30, 2020USD ($)
Progress Energy
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, amount	$ 363
Progress Energy | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-10-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, expected timing of satisfaction, period	3 months
Revenue, remaining performance obligation, amount	$ 30
Progress Energy | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, expected timing of satisfaction, period	1 year
Revenue, remaining performance obligation, amount	$ 92
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, expected timing of satisfaction, period	1 year
Revenue, remaining performance obligation, amount	$ 94
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, expected timing of satisfaction, period	1 year
Revenue, remaining performance obligation, amount	$ 44
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, expected timing of satisfaction, period	1 year
Revenue, remaining performance obligation, amount	$ 45
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, expected timing of satisfaction, period
Revenue, remaining performance obligation, amount	$ 58
Duke Energy Progress
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, amount	$ 34
Duke Energy Progress | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-10-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, expected timing of satisfaction, period	3 months
Revenue, remaining performance obligation, amount	$ 2
Duke Energy Progress | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, expected timing of satisfaction, period	1 year
Revenue, remaining performance obligation, amount	$ 8
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, expected timing of satisfaction, period	1 year
Revenue, remaining performance obligation, amount	$ 8
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, expected timing of satisfaction, period	1 year
Revenue, remaining performance obligation, amount	$ 8
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, expected timing of satisfaction, period	1 year
Revenue, remaining performance obligation, amount	$ 8
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
Duke Energy Florida
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, amount	$ 329
Duke Energy Florida | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-10-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, expected timing of satisfaction, period	3 months
Revenue, remaining performance obligation, amount	$ 28
Duke Energy Florida | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, expected timing of satisfaction, period	1 year
Revenue, remaining performance obligation, amount	$ 84
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, expected timing of satisfaction, period	1 year
Revenue, remaining performance obligation, amount	$ 86
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, expected timing of satisfaction, period	1 year
Revenue, remaining performance obligation, amount	$ 36
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, expected timing of satisfaction, period	1 year
Revenue, remaining performance obligation, amount	$ 37
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, expected timing of satisfaction, period
Revenue, remaining performance obligation, amount	$ 58
Duke Energy Indiana
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, amount	$ 62
Duke Energy Indiana | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-10-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, expected timing of satisfaction, period	3 months
Revenue, remaining performance obligation, amount	$ 2
Duke Energy Indiana | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, expected timing of satisfaction, period	1 year
Revenue, remaining performance obligation, amount	$ 5
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, 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, expected timing of satisfaction, period	1 year
Revenue, remaining performance obligation, amount	$ 7
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, expected timing of satisfaction, period	1 year
Revenue, remaining performance obligation, amount	$ 12
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, expected timing of satisfaction, period
Revenue, remaining performance obligation, amount	$ 36
Piedmont Natural Gas
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, amount	$ 642
Piedmont Natural Gas | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-10-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, expected timing of satisfaction, period	3 months
Revenue, remaining performance obligation, amount	$ 17
Piedmont Natural Gas | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, expected timing of satisfaction, period	1 year
Revenue, remaining performance obligation, amount	$ 65
Piedmont Natural Gas | 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, expected timing of satisfaction, period	1 year
Revenue, remaining performance obligation, amount	$ 64
Piedmont Natural Gas | 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, expected timing of satisfaction, period	1 year
Revenue, remaining performance obligation, amount	$ 61
Piedmont Natural Gas | 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, expected timing of satisfaction, period	1 year
Revenue, remaining performance obligation, amount	$ 58
Piedmont Natural Gas | 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
Revenue, remaining performance obligation, amount	$ 377

Revenue (Remaining Performanc_2

Revenue (Remaining Performance Obligations Total) (Details) $ in Millions	Sep. 30, 2020USD ($)
Progress Energy
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, amount	$ 363
Duke Energy Progress
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, amount	34
Duke Energy Florida
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, amount	329
Duke Energy Indiana
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, amount	62
Piedmont Natural Gas
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, amount	$ 642

Revenue (Disaggregation of Reve

Revenue (Disaggregation of Revenue) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	$ 6,658	$ 6,792	$ 17,817	$ 18,485
Revenue from sources other than contracts with customers	63	148	274	491
Total operating revenues	6,721	6,940	18,091	18,976
Electric Utilities and Infrastructure
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	6,378	6,492	16,538	17,074
Total operating revenues	6,371	6,569	16,571	17,357
Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | Residential
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	2,936	2,923	7,451	7,597
Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | General
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1,804	1,885	4,691	4,896
Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | Industrial
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	797	869	2,148	2,339
Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | Wholesale
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	603	617	1,535	1,685
Electric Utilities and Infrastructure | Other revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	238	198	713	557
Gas Utilities and Infrastructure
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	216	223	1,089	1,236
Total operating revenues	217	225	1,122	1,239
Gas Utilities and Infrastructure | Gas Utilities and Infrastructure | Residential
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	112	113	631	673
Gas Utilities and Infrastructure | Gas Utilities and Infrastructure | Commercial
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	64	68	308	359
Gas Utilities and Infrastructure | Gas Utilities and Infrastructure | Industrial
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	24	26	92	103
Gas Utilities and Infrastructure | Other revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	16	16	58	101
Commercial Renewables
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	57	69	170	157
Total operating revenues	126	138	378	362
Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	7	8	20	18
Total operating revenues	7	8	20	18
Duke Energy Carolinas
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	2,068	2,140	5,423	5,535
Revenue from sources other than contracts with customers	(10)	22	(7)	84
Total operating revenues	2,058	2,162	5,416	5,619
Duke Energy Carolinas | Electric Utilities and Infrastructure
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	2,068	2,140	5,423	5,535
Duke Energy Carolinas | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | Residential
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	883	892	2,316	2,331
Duke Energy Carolinas | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | General
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	664	687	1,720	1,714
Duke Energy Carolinas | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | Industrial
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	342	372	871	927
Duke Energy Carolinas | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | Wholesale
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	117	113	332	341
Duke Energy Carolinas | Electric Utilities and Infrastructure | Other revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	62	76	184	222
Progress Energy
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	3,179	3,167	8,039	8,334
Revenue from sources other than contracts with customers	18	75	78	224
Total operating revenues	3,197	3,242	8,117	8,558
Progress Energy | Electric Utilities and Infrastructure
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	3,179	3,167	8,039	8,334
Progress Energy | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | Residential
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1,550	1,522	3,792	3,879
Progress Energy | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | General
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	805	843	2,080	2,225
Progress Energy | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | Industrial
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	245	255	673	708
Progress Energy | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | Wholesale
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	412	429	1,018	1,133
Progress Energy | Electric Utilities and Infrastructure | Other revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	167	118	476	389
Duke Energy Progress
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1,612	1,651	4,151	4,446
Revenue from sources other than contracts with customers	14	37	56	113
Total operating revenues	1,626	1,688	4,207	4,559
Duke Energy Progress | Electric Utilities and Infrastructure
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1,612	1,651	4,151	4,446
Duke Energy Progress | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | Residential
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	616	625	1,578	1,657
Duke Energy Progress | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | General
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	384	399	1,001	1,044
Duke Energy Progress | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | Industrial
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	179	189	487	514
Duke Energy Progress | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | Wholesale
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	358	368	877	992
Duke Energy Progress | Electric Utilities and Infrastructure | Other revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	75	70	208	239
Duke Energy Florida
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1,567	1,516	3,888	3,888
Revenue from sources other than contracts with customers		32	9	99
Total operating revenues	1,567	1,548	3,897	3,987
Duke Energy Florida | Electric Utilities and Infrastructure
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1,567	1,516	3,888	3,888
Duke Energy Florida | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | Residential
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	934	897	2,214	2,222
Duke Energy Florida | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | General
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	421	444	1,079	1,181
Duke Energy Florida | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | Industrial
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	66	66	186	194
Duke Energy Florida | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | Wholesale
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	54	61	141	141
Duke Energy Florida | Electric Utilities and Infrastructure | Other revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	92	48	268	150
Duke Energy Ohio
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	481	494	1,405	1,454
Revenue from sources other than contracts with customers	(8)	(5)	(11)	(1)
Total operating revenues	473	489	1,394	1,453
Duke Energy Ohio | Electric Utilities and Infrastructure
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	400	413	1,081	1,102
Duke Energy Ohio | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | Residential
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	213	215	558	563
Duke Energy Ohio | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | General
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	119	127	336	335
Duke Energy Ohio | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | Industrial
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	35	40	103	109
Duke Energy Ohio | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | Wholesale
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	10	13	22	36
Duke Energy Ohio | Electric Utilities and Infrastructure | Other revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	23	18	62	59
Duke Energy Ohio | Gas Utilities and Infrastructure
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	81	81	324	352
Duke Energy Ohio | Gas Utilities and Infrastructure | Gas Utilities and Infrastructure | Residential
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	55	53	214	229
Duke Energy Ohio | Gas Utilities and Infrastructure | Gas Utilities and Infrastructure | Commercial
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	20	21	86	96
Duke Energy Ohio | Gas Utilities and Infrastructure | Gas Utilities and Infrastructure | Industrial
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	3	4	12	14
Duke Energy Ohio | Gas Utilities and Infrastructure | Other revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	3	3	12	13
Duke Energy Indiana
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	762	808	2,067	2,281
Revenue from sources other than contracts with customers	(1)	(1)	3	8
Total operating revenues	761	807	2,070	2,289
Duke Energy Indiana | Electric Utilities and Infrastructure
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	762	808	2,067	2,281
Duke Energy Indiana | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | Residential
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	289	294	785	825
Duke Energy Indiana | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | General
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	212	225	554	619
Duke Energy Indiana | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | Industrial
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	175	204	502	595
Duke Energy Indiana | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | Wholesale
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	64	63	163	176
Duke Energy Indiana | Electric Utilities and Infrastructure | Other revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	22	22	63	66
Piedmont Natural Gas
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	144	157	792	924
Revenue from sources other than contracts with customers	18	11	79	32
Total operating revenues	162	168	871	956
Piedmont Natural Gas | Gas Utilities and Infrastructure
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	144	157	792	924
Piedmont Natural Gas | Gas Utilities and Infrastructure | Gas Utilities and Infrastructure | Residential
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	57	59	417	443
Piedmont Natural Gas | Gas Utilities and Infrastructure | Gas Utilities and Infrastructure | Commercial
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	44	47	222	263
Piedmont Natural Gas | Gas Utilities and Infrastructure | Gas Utilities and Infrastructure | Industrial
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	22	25	80	91
Piedmont Natural Gas | Gas Utilities and Infrastructure | Gas Utilities and Infrastructure | Power Generation
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	10	13	27	39
Piedmont Natural Gas | Gas Utilities and Infrastructure | Other revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	$ 11	$ 13	$ 46	$ 88

Revenue (Reserve for Credit Los

Revenue (Reserve for Credit Losses for Trade and Other Receivables) (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2020
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance at December 31, 2019	$ 102	$ 76
Cumulative Change in Accounting Principle	133	76
Write-Offs	12	(7)
Credit Loss Expense	(9)	24
Other Adjustments	28	35
Balance at September 30, 2020	133	133
Duke Energy Carolinas
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance at December 31, 2019	14	10
Cumulative Change in Accounting Principle	22	22
Write-Offs	(2)	(8)
Credit Loss Expense		9
Other Adjustments	10	10
Balance at September 30, 2020	22	22
Progress Energy
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance at December 31, 2019	29	16
Cumulative Change in Accounting Principle	37	16
Write-Offs	15	8
Credit Loss Expense	(16)	2
Other Adjustments	9	9
Balance at September 30, 2020	37	37
Duke Energy Progress
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance at December 31, 2019	14	8
Cumulative Change in Accounting Principle	21	8
Write-Offs	13	8
Credit Loss Expense	(15)	(5)
Other Adjustments	9	9
Balance at September 30, 2020	21	21
Duke Energy Florida
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance at December 31, 2019	14	7
Cumulative Change in Accounting Principle	16	16
Write-Offs	2
Credit Loss Expense		8
Balance at September 30, 2020	16	16
Duke Energy Ohio
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance at December 31, 2019	5	4
Cumulative Change in Accounting Principle	5	4
Credit Loss Expense		1
Balance at September 30, 2020	5	5
Duke Energy Indiana
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance at December 31, 2019	3	3
Cumulative Change in Accounting Principle	3	3
Balance at September 30, 2020	3	3
Piedmont Natural Gas
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance at December 31, 2019	6	6
Cumulative Change in Accounting Principle	9	9
Write-Offs		(5)
Credit Loss Expense	3	7
Balance at September 30, 2020	$ 9	9
Cumulative Change in Accounting Principle
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance at December 31, 2019		5
Cumulative Change in Accounting Principle		5
Cumulative Change in Accounting Principle | Duke Energy Carolinas
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance at December 31, 2019		1
Cumulative Change in Accounting Principle		1
Cumulative Change in Accounting Principle | Progress Energy
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance at December 31, 2019		2
Cumulative Change in Accounting Principle		2
Cumulative Change in Accounting Principle | Duke Energy Progress
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance at December 31, 2019		1
Cumulative Change in Accounting Principle		1
Cumulative Change in Accounting Principle | Duke Energy Florida
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance at December 31, 2019		1
Cumulative Change in Accounting Principle		1
Cumulative Change in Accounting Principle | Piedmont Natural Gas
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance at December 31, 2019		1
Cumulative Change in Accounting Principle		$ 1

Revenue (Aging of Trade Receiva

Revenue (Aging of Trade Receivables) (Details) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Financing Receivable, Past Due [Line Items]
Unbilled Receivables	$ 788	$ 843
Trade and Other Receivables, not past due	1,800
Trade and Other Receivables	3,172
30-60 days
Financing Receivable, Past Due [Line Items]
Trade and Other Receivables	227
60-90 days
Financing Receivable, Past Due [Line Items]
Trade and Other Receivables	94
90 days
Financing Receivable, Past Due [Line Items]
Trade and Other Receivables	263
Duke Energy Carolinas
Financing Receivable, Past Due [Line Items]
Unbilled Receivables	284	298
Trade and Other Receivables, not past due	475
Trade and Other Receivables	969
Duke Energy Carolinas | 30-60 days
Financing Receivable, Past Due [Line Items]
Trade and Other Receivables	86
Duke Energy Carolinas | 60-90 days
Financing Receivable, Past Due [Line Items]
Trade and Other Receivables	39
Duke Energy Carolinas | 90 days
Financing Receivable, Past Due [Line Items]
Trade and Other Receivables	85
Progress Energy
Financing Receivable, Past Due [Line Items]
Unbilled Receivables	274	217
Trade and Other Receivables, not past due	847
Trade and Other Receivables	1,304
Progress Energy | 30-60 days
Financing Receivable, Past Due [Line Items]
Trade and Other Receivables	84
Progress Energy | 60-90 days
Financing Receivable, Past Due [Line Items]
Trade and Other Receivables	31
Progress Energy | 90 days
Financing Receivable, Past Due [Line Items]
Trade and Other Receivables	68
Duke Energy Progress
Financing Receivable, Past Due [Line Items]
Unbilled Receivables	139	122
Trade and Other Receivables, not past due	439
Trade and Other Receivables	683
Duke Energy Progress | 30-60 days
Financing Receivable, Past Due [Line Items]
Trade and Other Receivables	48
Duke Energy Progress | 60-90 days
Financing Receivable, Past Due [Line Items]
Trade and Other Receivables	20
Duke Energy Progress | 90 days
Financing Receivable, Past Due [Line Items]
Trade and Other Receivables	37
Duke Energy Florida
Financing Receivable, Past Due [Line Items]
Unbilled Receivables	135	95
Trade and Other Receivables, not past due	406
Trade and Other Receivables	619
Duke Energy Florida | 30-60 days
Financing Receivable, Past Due [Line Items]
Trade and Other Receivables	36
Duke Energy Florida | 60-90 days
Financing Receivable, Past Due [Line Items]
Trade and Other Receivables	11
Duke Energy Florida | 90 days
Financing Receivable, Past Due [Line Items]
Trade and Other Receivables	31
Duke Energy Ohio
Financing Receivable, Past Due [Line Items]
Unbilled Receivables	1	1
Trade and Other Receivables, not past due	44
Trade and Other Receivables	95
Duke Energy Ohio | 30-60 days
Financing Receivable, Past Due [Line Items]
Trade and Other Receivables	7
Duke Energy Ohio | 60-90 days
Financing Receivable, Past Due [Line Items]
Trade and Other Receivables	3
Duke Energy Ohio | 90 days
Financing Receivable, Past Due [Line Items]
Trade and Other Receivables	40
Duke Energy Indiana
Financing Receivable, Past Due [Line Items]
Unbilled Receivables	16	16
Trade and Other Receivables, not past due	23
Trade and Other Receivables	51
Duke Energy Indiana | 30-60 days
Financing Receivable, Past Due [Line Items]
Trade and Other Receivables	2
Duke Energy Indiana | 60-90 days
Financing Receivable, Past Due [Line Items]
Trade and Other Receivables	1
Duke Energy Indiana | 90 days
Financing Receivable, Past Due [Line Items]
Trade and Other Receivables	9
Piedmont Natural Gas
Financing Receivable, Past Due [Line Items]
Unbilled Receivables	5	$ 78
Trade and Other Receivables, not past due	66
Trade and Other Receivables	102
Piedmont Natural Gas | 30-60 days
Financing Receivable, Past Due [Line Items]
Trade and Other Receivables	8
Piedmont Natural Gas | 60-90 days
Financing Receivable, Past Due [Line Items]
Trade and Other Receivables	3
Piedmont Natural Gas | 90 days
Financing Receivable, Past Due [Line Items]
Trade and Other Receivables	$ 20

Revenue (Unbilled Revenues) (De

Revenue (Unbilled Revenues) (Details) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unbilled Receivables	$ 788	$ 843
Duke Energy Carolinas
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unbilled Receivables	284	298
Progress Energy
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unbilled Receivables	274	217
Duke Energy Progress
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unbilled Receivables	139	122
Duke Energy Florida
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unbilled Receivables	135	95
Duke Energy Ohio
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unbilled Receivables	1	1
Duke Energy Ohio | CRC
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unbilled Receivables	66	82
Duke Energy Indiana
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unbilled Receivables	16	16
Duke Energy Indiana | CRC
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unbilled Receivables	106	115
Piedmont Natural Gas
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unbilled Receivables	$ 5	$ 78

Stockholders' Equity (Earnings

Stockholders' Equity (Earnings Per Share Data) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Class of Stock [Line Items]
Net income available to Duke Energy common stockholders	$ 1,265	$ 1,327	$ 1,347	$ 3,047
Accumulated preferred stock dividends adjustment	12	(2)	13	(2)
Less: Impact of participating securities	1	1	2	4
Income from continuing operations available to Duke Energy common stockholders	$ 1,276	$ 1,324	$ 1,358	$ 3,041
Weighted average common shares outstanding – basic (in shares)	735	729	735	728
Weighted average common shares outstanding – diluted (in shares)	735	729	735	728
EPS available to Duke Energy common stockholders
Basic and diluted (in usd per share)	$ 1.74	$ 1.82	$ 1.85	$ 4.18
Potentially dilutive items excluded from the calculation (in shares)	2	2	2	2
Common Stock
EPS available to Duke Energy common stockholders
Dividends declared per common share (in usd per share)	$ 0.965	$ 0.945	$ 2.855	$ 2.800
Preferred stock, Series A
EPS available to Duke Energy common stockholders
Dividends declared on preferred stock per depositary share (in usd per share)	0.359	$ 0.359	$ 1.078	$ 0.667
Cumulative dividend rate per annum			5.75%
Price per share (in usd per share)	25		$ 25
Preferred stock, Series B
EPS available to Duke Energy common stockholders
Dividends declared on preferred stock per depositary share (in usd per share)	24.375		$ 49.292
Cumulative dividend rate per annum			4.875%
Liquidation preference per share (in usd per share)	$ 1,000		$ 1,000

Stockholders' Equity (Common St

Stockholders' Equity (Common Stock) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Billions	1 Months Ended
	Aug. 31, 2020	May 31, 2020	Mar. 31, 2020	Nov. 30, 2019	Sep. 30, 2020
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
If net share settlement was elected | Equity forwards
Forward Contract Indexed to Issuer's Equity [Line Items]
Forward Contract Indexed to Issuer's Equity, Settlement Alternatives, Shares, at Fair Value					1,900

Employee Benefit Plans (Compone

Employee Benefit Plans (Components of Net Periodic Pension Costs) (Details) - Qualified Pension Plans - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	$ 41	$ 42	$ 124	$ 116
Interest cost on projected benefit obligation	67	77	202	242
Expected return on plan assets	(143)	(140)	(429)	(426)
Amortization of actuarial loss	32	28	96	77
Amortization of prior service credit	(8)	(8)	(24)	(24)
Amortization of settlement charges	11		16
Net periodic pension costs		(1)	(15)	(15)
Duke Energy Carolinas
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	12	13	38	37
Interest cost on projected benefit obligation	16	17	47	58
Expected return on plan assets	(36)	(36)	(108)	(111)
Amortization of actuarial loss	7	6	21	17
Amortization of prior service credit	(2)	(2)	(6)	(6)
Amortization of settlement charges	6		8
Net periodic pension costs	3	(2)		(5)
Progress Energy
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	12	13	36	34
Interest cost on projected benefit obligation	21	24	64	76
Expected return on plan assets	(48)	(45)	(143)	(134)
Amortization of actuarial loss	10	10	30	28
Amortization of prior service credit		(1)	(2)	(2)
Amortization of settlement charges	5		6
Net periodic pension costs		1	(9)	2
Duke Energy Progress
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	6	7	20	19
Interest cost on projected benefit obligation	10	10	29	34
Expected return on plan assets	(22)	(22)	(66)	(66)
Amortization of actuarial loss	4	4	13	10
Amortization of prior service credit			(1)	(1)
Amortization of settlement charges	5		6
Net periodic pension costs	3	(1)	1	(4)
Duke Energy Florida
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	5	5	16	15
Interest cost on projected benefit obligation	12	14	35	41
Expected return on plan assets	(25)	(22)	(76)	(66)
Amortization of actuarial loss	6	6	17	18
Amortization of prior service credit			(1)	(1)
Amortization of settlement charges	1		1
Net periodic pension costs	(1)	3	(8)	7
Duke Energy Ohio
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	1	1	3	3
Interest cost on projected benefit obligation	4	5	12	14
Expected return on plan assets	(7)	(7)	(21)	(21)
Amortization of actuarial loss	2	2	5	3
Net periodic pension costs		1	(1)	(1)
Duke Energy Indiana
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	2	2	6	6
Interest cost on projected benefit obligation	6	6	17	19
Expected return on plan assets	(11)	(11)	(32)	(32)
Amortization of actuarial loss	3	3	9	6
Amortization of prior service credit			(1)	(1)
Amortization of settlement charges	1		1
Net periodic pension costs	1			(2)
Piedmont Natural Gas
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	1	1	4	4
Interest cost on projected benefit obligation	2	2	7	8
Expected return on plan assets	(5)	(5)	(16)	(16)
Amortization of actuarial loss	2	2	7	5
Amortization of prior service credit	(2)	(2)	(7)	(7)
Amortization of settlement charges	1		1
Net periodic pension costs	$ (1)	$ (2)	$ (4)	$ (6)

Income Taxes (Effective Tax Rat

Income Taxes (Effective Tax Rates) (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Reconciliation of Income Tax Expense at the U.S. Federal Statutory Tax Rate to the Actual Tax Expense from Continuing Operations [Abstract]
Effective tax rate	7.80%	12.40%	(6.40%)	12.50%
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]
Effective tax rate	12.00%	16.70%	13.60%	17.70%
Progress Energy
Reconciliation of Income Tax Expense at the U.S. Federal Statutory Tax Rate to the Actual Tax Expense from Continuing Operations [Abstract]
Effective tax rate	10.40%	15.30%	13.40%	16.20%
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]
Effective tax rate	3.10%	14.70%	10.00%	16.10%
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]
Effective tax rate	21.40%	16.50%	20.30%	18.00%
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]
Effective tax rate	16.70%	12.90%	16.60%	15.20%
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]
Effective tax rate	19.60%	23.20%	19.40%	23.70%
Piedmont Natural Gas
Reconciliation of Income Tax Expense at the U.S. Federal Statutory Tax Rate to the Actual Tax Expense from Continuing Operations [Abstract]
Effective tax rate	16.70%	35.70%	3.70%	18.50%

Income Taxes (Narrative) (Detai

Income Taxes (Narrative) (Details) - AMT credit carryforwards $ in Millions	3 Months Ended
	Sep. 30, 2020USD ($)
Tax Credit Carryforward [Line Items]
AMT credit received	$ 572
Interest income	$ 19

Subsequent Events (Narrative) (

Subsequent Events (Narrative) (Details) - Subsequent event customer in Millions, $ in Millions	Oct. 29, 2020USD ($)customer
Subsequent Event [Line Items]
Customer power outages | customer	1
Estimated storm costs, expected not to exceed | $	$ 100