Piedmont Natural Gas (PNY) 10-Q 7 May 24 2024 Q1 Quarterly report Financial data

Cover Page

Cover Page - shares	3 Months Ended
	Mar. 31, 2024	Apr. 30, 2024
Entity Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2024
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	525 South Tryon Street
Entity Address, City or Town	Charlotte
Entity Address, State or Province	NC
Entity Address, Postal Zip Code	28202
City Area Code	800
Local Phone Number	488-3853
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		771,768,612
Entity Central Index Key	0001326160
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2024
Document Fiscal Period Focus	Q1
Amendment Flag	false
Duke Energy Carolinas
Entity 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	525 South Tryon Street
Entity Address, City or Town	Charlotte
Entity Address, State or Province	NC
Entity Address, Postal Zip Code	28202
City Area Code	800
Local Phone Number	488-3853
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
Entity Central Index Key	0000030371
Current Fiscal Year End Date	--12-31
Progress Energy
Entity 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	411 Fayetteville Street
Entity Address, City or Town	Raleigh
Entity Address, State or Province	NC
Entity Address, Postal Zip Code	27601
City Area Code	800
Local Phone Number	488-3853
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
Entity Common Stock, Shares Outstanding		100
Entity Central Index Key	0001094093
Current Fiscal Year End Date	--12-31
Duke Energy Progress
Entity 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	411 Fayetteville Street
Entity Address, City or Town	Raleigh
Entity Address, State or Province	NC
Entity Address, Postal Zip Code	27601
City Area Code	800
Local Phone Number	488-3853
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
Entity Central Index Key	0000017797
Current Fiscal Year End Date	--12-31
Duke Energy Florida
Entity 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	800
Local Phone Number	488-3853
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
Entity Central Index Key	0000037637
Current Fiscal Year End Date	--12-31
Duke Energy Ohio
Entity 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	800
Local Phone Number	488-3853
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
Entity Common Stock, Shares Outstanding		89,663,086
Entity Central Index Key	0000020290
Current Fiscal Year End Date	--12-31
Duke Energy Indiana
Entity 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	800
Local Phone Number	488-3853
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
Entity Central Index Key	0000081020
Current Fiscal Year End Date	--12-31
Piedmont
Entity 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	525 South Tryon Street
Entity Address, City or Town	Charlotte
Entity Address, State or Province	NC
Entity Address, Postal Zip Code	28202
City Area Code	800
Local Phone Number	488-3853
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
Entity Common Stock, Shares Outstanding		100
Entity Central Index Key	0000078460
Current Fiscal Year End Date	--12-31
Common Stock
Entity Information [Line Items]
Title of 12(b) Security	Common Stock, $0.001 par value
Trading Symbol	DUK
Security Exchange Name	NYSE
Junior Subordinated Debentures 5.625% Coupon Due September 2078
Entity Information [Line Items]
Title of 12(b) Security	5.625% Junior Subordinated Debentures
Trading Symbol	DUKB
Security Exchange Name	NYSE
Depositary Share
Entity Information [Line Items]
Title of 12(b) Security	Depositary Shares
Trading Symbol	DUK PR A
Security Exchange Name	NYSE
Senior Notes 3.10% Due 2028
Entity Information [Line Items]
Title of 12(b) Security	3.10% Senior Notes
Trading Symbol	DUK 28A
Security Exchange Name	NYSE
Senior Notes 3.85% Due 2034
Entity Information [Line Items]
Title of 12(b) Security	3.85% Senior Notes
Trading Symbol	DUK 34
Security Exchange Name	NYSE
Senior Notes 3.75% Due 2031
Entity Information [Line Items]
Title of 12(b) Security	3.75% Senior Notes
Trading Symbol	DUK 31A
Security Exchange Name	NYSE

Condensed Consolidated Statemen

Condensed Consolidated Statements of Operations - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Operating Revenues
Regulated electric	$ 6,732	$ 6,324
Regulated natural gas	866	882
Nonregulated electric and other	73	70
Total operating revenues	7,671	7,276
Operating Expenses
Operation, maintenance and other	1,379	1,310
Depreciation and amortization	1,387	1,227
Property and other taxes	386	389
Impairment of assets and other charges	1	8
Total operating expenses	5,720	5,609
Gains on Sales of Other Assets and Other, net	12	7
Operating Income	1,963	1,674
Other Income and Expenses
Equity in earnings of unconsolidated affiliates	17	20
Other income and expenses, net	169	151
Total other income and expenses	186	171
Interest Expense	817	720
Income From Continuing Operations Before Income Taxes	1,332	1,125
Income Tax Expense From Continuing Operations	178	155
Income From Continuing Operations	1,154	970
Loss From Discontinued Operations, net of tax	(3)	(209)
Net Income	1,151	761
Add: Net (Income) Loss Attributable to Noncontrolling Interests	(13)	43
Net Income Attributable to Duke Energy Corporation	1,138	804
Less: Preferred Dividends	39	39
Net Income Available to Duke Energy Corporation Common Stockholders	$ 1,099	$ 765
Income from continuing operations available to Duke Energy Corporation common stockholders
Basic (in usd per share)	$ 1.44	$ 1.20
Diluted (in usd per share)	1.44	1.20
Loss from discontinued operations attributable to Duke Energy Corporation common stockholders
Basic (in usd per share)	0	(0.19)
Diluted (in usd per share)	0	(0.19)
Net income available to Duke Energy Corporation common stockholders
Basic (in usd per share)	1.44	1.01
Diluted (in usd per share)	$ 1.44	$ 1.01
Weighted Average Shares Outstanding
Basic (in shares)	771	770
Diluted (in shares)	771	770
Fuel used in electric generation and purchased power
Operating Expenses
Cost of sales	$ 2,335	$ 2,377
Cost of natural gas
Operating Expenses
Cost of sales	$ 232	$ 298

Condensed Consolidated Statem_2

Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2024	Mar. 31, 2023
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest [Abstract]
Net income		$ 1,151	$ 761
Other Comprehensive Income (Loss), net of tax
Pension and OPEB adjustments	[1]	16	(1)
Net unrealized gains (losses) on cash flow hedges	[1]	91	(20)
Reclassification into earnings from cash flow hedges	[1]	2	0
Net unrealized gains (losses) on fair value hedges	[1]	8	(11)
Unrealized gains on available-for-sale securities	[1]	(2)	6
Other Comprehensive Income (Loss), net of tax	[1]	115	(26)
Comprehensive Income		1,266	735
Add: Comprehensive (Income) Loss Attributable to Noncontrolling Interests		(13)	43
Comprehensive Income Attributable to Duke Energy		1,253	778
Less: Preferred Dividends		39	39
Comprehensive Income Available to Duke Energy Corporation Common Stockholders		$ 1,214	$ 739
[1] Net of income tax expense of approximately $34 million and tax benefit of $8 million for the three months ended March 31, 2024, and 2023, respectively.

Condensed Consolidated Statem_3

Condensed Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Statement of Comprehensive Income [Abstract]
Other comprehensive income, tax expense	$ 34	$ (8)

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Current Assets
Cash and cash equivalents	$ 459	$ 253
Receivables (net of allowance for doubtful accounts)	1,646	1,112
Receivables of VIEs (net of allowance for doubtful accounts)	2,253	3,019
Inventory	4,281	4,292
Regulatory assets	3,082	3,648
Assets held for sale	11	14
Other (includes amounts related to VIEs)	359	431
Total current assets	12,091	12,769
Property, Plant and Equipment
Cost	173,926	171,353
Accumulated depreciation and amortization	(57,035)	(56,038)
Net property, plant and equipment	116,891	115,315
Other Noncurrent Assets
Goodwill	19,303	19,303
Regulatory assets	13,636	13,618
Nuclear decommissioning trust funds	10,775	10,143
Operating lease right-of-use assets, net	1,092	1,092
Investments in equity method unconsolidated affiliates	502	492
Assets held for sale	308	197
Other	4,072	3,964
Total other noncurrent assets	49,688	48,809
Total Assets	178,670	176,893
Current Liabilities
Accounts payable	3,364	4,228
Notes payable and commercial paper	4,155	4,288
Taxes accrued	708	816
Interest accrued	798	745
Current maturities of long-term debt	2,274	2,800
Asset retirement obligations	603	596
Regulatory liabilities	1,309	1,369
Liabilities associated with assets held for sale	251	122
Other	2,084	2,319
Total current liabilities	15,546	17,283
Long-Term Debt (includes amounts related to VIEs)	74,979	72,452
Other Noncurrent Liabilities
Deferred income taxes	10,721	10,556
Asset retirement obligations	8,487	8,560
Regulatory liabilities	14,571	14,039
Operating lease liabilities	915	917
Accrued pension and other post-retirement benefit costs	473	485
Investment tax credits	862	864
Liabilities associated with assets held for sale	126	157
Other (includes $19 at 2024 and $17 at 2023 related to VIEs)	1,352	1,393
Total other noncurrent liabilities	37,507	36,971
Commitments and Contingencies
Equity
Common stock	1	1
Additional paid-in capital	44,937	44,920
Retained earnings	2,542	2,235
Accumulated other comprehensive income (loss)	109	(6)
Total Duke Energy Corporation stockholders' equity	49,551	49,112
Noncontrolling interests	1,087	1,075
Total equity	50,638	50,187
Total Liabilities and Equity	178,670	176,893
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	Mar. 31, 2024	Dec. 31, 2023
Allowance for doubtful accounts - receivables	$ 102	$ 55
Inventory	4,281	4,292
Regulatory assets	3,082	3,648
Current Assets: Other	359	431
Regulatory assets	13,636	13,618
Accounts payable	3,364	4,228
Current maturities of long-term debt	2,274	2,800
Long-Term Debt	74,979	72,452
Other	$ 1,352	$ 1,393
Common stock, par value (in usd per share)	$ 0.001	$ 0.001
Common stock, shares authorized (in shares)	2,000,000,000	2,000,000,000
Common stock, shares outstanding (in shares)	772,000,000	771,000,000
Preferred stock, Series A
Preferred stock, par value (in usd per share)	$ 0.001	$ 0.001
Preferred stock, depositary shares authorized (in shares)	40,000,000	40,000,000
Preferred stock, depositary shares outstanding (in shares)	40,000,000	40,000,000
Preferred stock, Series B
Preferred stock, par value (in usd per share)	$ 0.001	$ 0.001
Preferred stock, depositary shares authorized (in shares)	1,000,000	1,000,000
Preferred stock, depositary shares outstanding (in shares)	1,000,000	1,000,000
Variable Interest Entity
Allowance for doubtful accounts - receivables of VIEs	$ 102	$ 150
Inventory	470	462
Regulatory assets	110	110
Current Assets: Other	44	90
Regulatory assets	1,616	1,642
Accounts payable	188	188
Current maturities of long-term debt	929	428
Long-Term Debt	2,134	3,000
Other	$ 42	$ 35

Condensed Consolidated Statem_4

Condensed Consolidated Statements of Cash Flows - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 1,151	$ 761
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and accretion (including amortization of nuclear fuel)	1,534	1,344
Equity component of AFUDC	(55)	(46)
(Gains) Losses on sales of Commercial Renewables Disposal Groups	(10)	220
Gains on sales of other assets	(12)	(7)
Impairment of assets and other charges	1	8
Deferred income taxes	149	90
Equity in earnings of unconsolidated affiliates	(17)	(20)
Payments for asset retirement obligations	(115)	(117)
Provision for rate refunds	(4)	(33)
(Increase) decrease in
Net realized and unrealized mark-to-market and hedging transactions	(33)	5
Receivables	226	754
Inventory	11	(275)
Other current assets	329	262
Increase (decrease) in
Accounts payable	(553)	(1,193)
Taxes accrued	(110)	(148)
Other current liabilities	(208)	(266)
Other assets	41	(13)
Other liabilities	149	157
Net cash provided by operating activities	2,474	1,483
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(3,208)	(3,146)
Contributions to equity method investments	(7)	(6)
Purchases of debt and equity securities	(946)	(866)
Proceeds from sales and maturities of debt and equity securities	985	882
Net proceeds from the sales of other assets	0	76
Other	166	149
Net cash used in investing activities	(3,342)	(3,209)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from the issuance of long-term debt	3,481	4,085
Issuance of common stock	4	0
Payments for the redemption of long-term debt	(1,392)	(1,380)
Proceeds from the issuance of short-term debt with original maturities greater than 90 days	294	2
Payments for the redemption of short-term debt with original maturities greater than 90 days	(535)	(50)
Notes payable and commercial paper	50	(217)
Contributions from noncontrolling interests	0	206
Dividends paid	(806)	(815)
Other	(67)	(84)
Net cash provided by financing activities	1,029	1,747
Net increase in cash, cash equivalents and restricted cash	161	21
Cash, cash equivalents and restricted cash at beginning of period	357	603
Cash, cash equivalents and restricted cash at end of period	518	624
Significant non-cash transactions:
Accrued capital expenditures	$ 1,615	$ 1,366

Condensed Consolidated Statem_5

Condensed Consolidated Statements of Changes in Equity - USD ($) shares in Millions, $ in Millions		Total		Total Equity	Preferred Stock	Common Stock	Additional Paid-in Capital	Retained Earnings	Net Gains (Losses) on Hedges	[1]	Net Unrealized Gains (Losses) on Available-for-Sale Securities	Pension and OPEB Adjustments	Noncontrolling Interests	Common Stock	Common Stock Total Equity	Common Stock Additional Paid-in Capital
Beginning Balance (Attributable to Parent) at Dec. 31, 2022				$ 49,322	$ 1,962	$ 1	$ 44,862	$ 2,637	$ (29)		$ (23)	$ (88)
Beginning Balance (in shares) at Dec. 31, 2022						770
Beginning Balance (Attributable to Noncontrolling Interest) at Dec. 31, 2022													$ 2,531
Beginning Balance (Parent) at Dec. 31, 2022		$ 51,853
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)		722		765				765					(43)
Other Comprehensive Income (Loss), net of tax		(26)	[2]	(26)					(31)		6	(1)
Common stock issuances, including dividend reinvestment and employee benefits (in shares)						1
Common stock issuances, including dividend reinvestment and employee benefits														$ (10)	$ (10)	$ (10)
Common stock dividends		(776)		(776)				(776)
Sale of noncontrolling interest		(3)		(13)			(13)						10
Contributions from noncontrolling interests, net of transaction costs	[3]	206											206
Distributions to noncontrolling interest in subsidiaries		(13)											(13)
Other		(2)		(2)			(2)	0
Ending Balance (Attributable to Parent) at Mar. 31, 2023				49,260	1,962	$ 1	44,837	2,626	(60)		(17)	(89)
Beginning Balance (in shares) at Mar. 31, 2023						771
Ending Balance (Attributable to Noncontrolling Interest) at Mar. 31, 2023													2,691
Ending Balance (Parent) at Mar. 31, 2023		51,951
Beginning Balance (Attributable to Parent) at Dec. 31, 2023		$ 49,112		49,112	1,962	$ 1	44,920	2,235	98		(15)	(89)
Beginning Balance (in shares) at Dec. 31, 2023		771				771
Beginning Balance (Attributable to Noncontrolling Interest) at Dec. 31, 2023		$ 1,075											1,075
Beginning Balance (Parent) at Dec. 31, 2023		50,187
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)		1,112		1,099				1,099					13
Other Comprehensive Income (Loss), net of tax		115	[2]	115					101		(2)	16
Common stock issuances, including dividend reinvestment and employee benefits (in shares)						1
Common stock issuances, including dividend reinvestment and employee benefits		16		16			16
Common stock dividends		(792)		(792)				(792)
Other				1			1						(1)
Ending Balance (Attributable to Parent) at Mar. 31, 2024		$ 49,551		$ 49,551	$ 1,962	$ 1	$ 44,937	$ 2,542	$ 199		$ (17)	$ (73)
Beginning Balance (in shares) at Mar. 31, 2024		772				772
Ending Balance (Attributable to Noncontrolling Interest) at Mar. 31, 2024		$ 1,087											$ 1,087
Ending Balance (Parent) at Mar. 31, 2024		$ 50,638
[1] See Duke Energy Condensed Consolidated Statements of Comprehensive Income for detailed activity related to Cash Flow and Fair Value hedges. Net of income tax expense of approximately $34 million and tax benefit of $8 million for the three months ended March 31, 2024, and 2023, respectively. Relates primarily to tax equity financing activity in the Commercial Renewables Disposal Groups.

Condensed Consolidated Statem_6

Condensed Consolidated Statements of Operations and Comprehensive Income - Duke Energy Carolinas - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Operating Revenues	$ 7,671	$ 7,276
Operating Expenses
Operation, maintenance and other	1,379	1,310
Depreciation and amortization	1,387	1,227
Property and other taxes	386	389
Impairment of assets and other charges	1	8
Total operating expenses	5,720	5,609
Gains on Sales of Other Assets and Other, net	12	7
Operating Income	1,963	1,674
Other Income and Expenses, net	186	171
Interest Expense	817	720
Income From Continuing Operations Before Income Taxes	1,332	1,125
Income Tax Expense From Continuing Operations	178	155
Comprehensive Income Attributable to Duke Energy	1,253	778
Net Income Attributable to Duke Energy Corporation	1,138	804
Duke Energy Carolinas
Operating Revenues	2,407	1,934
Operating Expenses
Cost of sales	860	623
Operation, maintenance and other	451	440
Depreciation and amortization	397	366
Property and other taxes	94	95
Impairment of assets and other charges	1	2
Total operating expenses	1,803	1,526
Gains on Sales of Other Assets and Other, net	1	0
Operating Income	605	408
Other Income and Expenses, net	61	59
Interest Expense	180	160
Income From Continuing Operations Before Income Taxes	486	307
Income Tax Expense From Continuing Operations	56	35
Comprehensive Income Attributable to Duke Energy	430	272
Net Income Attributable to Duke Energy Corporation	$ 430	$ 272

Condensed Consolidated Balanc_3

Condensed Consolidated Balance Sheets - Duke Energy Carolinas - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Current Assets
Cash and cash equivalents	$ 459	$ 253
Receivables of VIEs (net of allowance for doubtful accounts)	2,253	3,019
Receivables (net of allowance for doubtful accounts)	1,646	1,112
Inventory	4,281	4,292
Regulatory assets	3,082	3,648
Other (includes amounts related to VIEs)	359	431
Total current assets	12,091	12,769
Property, Plant and Equipment
Cost	173,926	171,353
Accumulated depreciation and amortization	(57,035)	(56,038)
Net property, plant and equipment	116,891	115,315
Other Noncurrent Assets
Regulatory assets	13,636	13,618
Nuclear decommissioning trust funds	10,775	10,143
Operating lease right-of-use assets, net	1,092	1,092
Other	4,072	3,964
Total other noncurrent assets	49,688	48,809
Total Assets	178,670	176,893
Current Liabilities
Accounts payable	3,364	4,228
Taxes accrued	708	816
Interest accrued	798	745
Current maturities of long-term debt	2,274	2,800
Asset retirement obligations	603	596
Regulatory liabilities	1,309	1,369
Other	2,084	2,319
Total current liabilities	15,546	17,283
Long-Term Debt (includes amounts related to VIEs)	74,979	72,452
Other Noncurrent Liabilities
Deferred income taxes	10,721	10,556
Asset retirement obligations	8,487	8,560
Regulatory liabilities	14,571	14,039
Operating lease liabilities	915	917
Accrued pension and other post-retirement benefit costs	473	485
Investment tax credits	862	864
Other	1,352	1,393
Total other noncurrent liabilities	37,507	36,971
Commitments and Contingencies
Equity
Accumulated other comprehensive income (loss)	109	(6)
Total Liabilities and Equity	178,670	176,893
Duke Energy Carolinas
Current Assets
Cash and cash equivalents	5	9
Receivables of VIEs (net of allowance for doubtful accounts)	245	265
Receivables (net of allowance for doubtful accounts)	997	991
Inventory	1,478	1,484
Regulatory assets	1,347	1,564
Other (includes amounts related to VIEs)	62	31
Total current assets	4,307	4,547
Property, Plant and Equipment
Cost	57,477	56,670
Accumulated depreciation and amortization	(20,210)	(19,896)
Net property, plant and equipment	37,267	36,774
Other Noncurrent Assets
Regulatory assets	3,850	3,916
Nuclear decommissioning trust funds	6,077	5,686
Operating lease right-of-use assets, net	75	78
Other	1,116	1,109
Total other noncurrent assets	11,118	10,789
Total Assets	52,692	52,110
Current Liabilities
Accounts payable	925	1,183
Taxes accrued	148	281
Interest accrued	161	179
Current maturities of long-term debt	520	19
Asset retirement obligations	236	224
Regulatory liabilities	574	587
Other	617	702
Total current liabilities	3,466	4,038
Long-Term Debt (includes amounts related to VIEs)	16,199	15,693
Other Noncurrent Liabilities
Deferred income taxes	4,329	4,379
Asset retirement obligations	3,779	3,789
Regulatory liabilities	6,302	5,990
Operating lease liabilities	72	75
Accrued pension and other post-retirement benefit costs	54	57
Investment tax credits	300	301
Other	554	581
Total other noncurrent liabilities	15,390	15,172
Commitments and Contingencies
Equity
Member's equity	17,343	16,913
Accumulated other comprehensive income (loss)	(6)	(6)
Total equity	17,337	16,907
Total Liabilities and Equity	52,692	52,110
Duke Energy Carolinas | Affiliated Entity
Current Assets
Receivables of VIEs (net of allowance for doubtful accounts)	173	203
Current Liabilities
Accounts payable	230	195
Notes payable to affiliated companies	55	668
Long-Term Debt (includes amounts related to VIEs)	$ 300	$ 300

Condensed Consolidated Balanc_4

Condensed Consolidated Balance Sheets - Duke Energy Carolinas (Parenthetical) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Allowance for doubtful accounts - receivables	$ 102	$ 55
Regulatory assets	3,082	3,648
Current Assets: Other	359	431
Regulatory assets	13,636	13,618
Current maturities of long-term debt	2,274	2,800
Long-Term Debt	74,979	72,452
Other	1,352	1,393
Variable Interest Entity
Allowance for doubtful accounts - receivables of VIEs	102	150
Regulatory assets	110	110
Current Assets: Other	44	90
Regulatory assets	1,616	1,642
Current maturities of long-term debt	929	428
Long-Term Debt	2,134	3,000
Other	42	35
Duke Energy Carolinas
Allowance for doubtful accounts - receivables	13	11
Allowance for doubtful accounts - receivables of VIEs	49	45
Regulatory assets	1,347	1,564
Current Assets: Other	62	31
Regulatory assets	3,850	3,916
Current maturities of long-term debt	520	19
Long-Term Debt	16,199	15,693
Other	554	581
Duke Energy Carolinas | Variable Interest Entity
Regulatory assets	12	12
Current Assets: Other	5	9
Regulatory assets	193	196
Current maturities of long-term debt	511	10
Long-Term Debt	203	708
Other	$ 19	$ 17

Condensed Consolidated Statem_7

Condensed Consolidated Statements of Cash Flows - Duke Energy Carolinas - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 1,151	$ 761
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and accretion (including amortization of nuclear fuel)	1,534	1,344
Equity component of AFUDC	(55)	(46)
Impairment of assets and other charges	1	8
Deferred income taxes	149	90
Payments for asset retirement obligations	(115)	(117)
Provision for rate refunds	(4)	(33)
(Increase) decrease in
Receivables	226	754
Inventory	11	(275)
Other current assets	329	262
Increase (decrease) in
Accounts payable	(553)	(1,193)
Taxes accrued	(110)	(148)
Other current liabilities	(208)	(266)
Other assets	41	(13)
Other liabilities	149	157
Net cash provided by operating activities	2,474	1,483
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(3,208)	(3,146)
Purchases of debt and equity securities	(946)	(866)
Proceeds from sales and maturities of debt and equity securities	985	882
Other	(166)	(149)
Net cash used in investing activities	(3,342)	(3,209)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from the issuance of long-term debt	3,481	4,085
Payments for the redemption of long-term debt	(1,392)	(1,380)
Other	(67)	(84)
Net cash provided by financing activities	1,029	1,747
Net increase in cash, cash equivalents and restricted cash	161	21
Cash, cash equivalents and restricted cash at beginning of period	357	603
Cash, cash equivalents and restricted cash at end of period	518	624
Significant non-cash transactions:
Accrued capital expenditures	1,615	1,366
Duke Energy Carolinas
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	430	272
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and accretion (including amortization of nuclear fuel)	463	426
Equity component of AFUDC	(28)	(24)
Impairment of assets and other charges	1	2
Deferred income taxes	14	32
Payments for asset retirement obligations	(36)	(39)
Provision for rate refunds	(4)	(19)
(Increase) decrease in
Receivables	14	199
Receivables from affiliated companies	30	209
Inventory	7	(139)
Other current assets	(23)	(293)
Increase (decrease) in
Accounts payable	(203)	(594)
Accounts payable to affiliated companies	35	27
Taxes accrued	(133)	(119)
Other current liabilities	(134)	(78)
Other assets	191	206
Other liabilities	(19)	76
Net cash provided by operating activities	605	144
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(952)	(866)
Purchases of debt and equity securities	(535)	(556)
Proceeds from sales and maturities of debt and equity securities	535	556
Other	(51)	(59)
Net cash used in investing activities	(1,003)	(925)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from the issuance of long-term debt	1,011	1,845
Payments for the redemption of long-term debt	(7)	(1,007)
Notes payable to affiliated companies	(612)	(79)
Other	(1)	(1)
Net cash provided by financing activities	391	758
Net increase in cash, cash equivalents and restricted cash	(7)	(23)
Cash, cash equivalents and restricted cash at beginning of period	19	53
Cash, cash equivalents and restricted cash at end of period	12	30
Significant non-cash transactions:
Accrued capital expenditures	$ 550	$ 449

Condensed Consolidated Statem_8

Condensed Consolidated Statements of Changes in Equity - Duke Energy Carolinas - USD ($) $ in Millions	Total	Duke Energy Carolinas	Duke Energy Carolinas Member's Equity	Duke Energy Carolinas Net Losses on Cash Flow Hedges
Beginning balance at Dec. 31, 2022		$ 15,442	$ 15,448	$ (6)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	$ 804	272	272
Ending balance at Mar. 31, 2023		15,714	15,720	(6)
Beginning balance at Dec. 31, 2023		16,907	16,913	(6)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	$ 1,138	430	430
Ending balance at Mar. 31, 2024		$ 17,337	$ 17,343	$ (6)

Condensed Consolidated Statem_9

Condensed Consolidated Statements of Operations and Comprehensive Income - Progress Energy - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2024	Mar. 31, 2023
Operating Revenues		$ 7,671	$ 7,276
Operating Expenses
Operation, maintenance and other		1,379	1,310
Depreciation and amortization		1,387	1,227
Property and other taxes		386	389
Impairment of assets and other charges		1	8
Total operating expenses		5,720	5,609
Gains on Sales of Other Assets and Other, net		12	7
Operating Income		1,963	1,674
Other Income and Expenses, net		186	171
Interest Expense		817	720
Income From Continuing Operations Before Income Taxes		1,332	1,125
Income Tax Expense From Continuing Operations		178	155
Net Income Attributable to Duke Energy Corporation		1,138	804
Unrealized gains on available-for-sale securities	[1]	(2)	6
Other Comprehensive Income (Loss), net of tax	[1]	115	(26)
Comprehensive Income		1,266	735
Progress Energy
Operating Revenues		3,228	3,048
Operating Expenses
Cost of sales		1,143	1,191
Operation, maintenance and other		628	568
Depreciation and amortization		587	504
Property and other taxes		158	168
Impairment of assets and other charges		0	5
Total operating expenses		2,516	2,436
Gains on Sales of Other Assets and Other, net		7	6
Operating Income		719	618
Other Income and Expenses, net		62	59
Interest Expense		260	246
Income From Continuing Operations Before Income Taxes		521	431
Income Tax Expense From Continuing Operations		86	72
Net Income Attributable to Duke Energy Corporation		435	359
Unrealized gains on available-for-sale securities		0	2
Other Comprehensive Income (Loss), net of tax		0	2
Comprehensive Income		$ 435	$ 361
[1] Net of income tax expense of approximately $34 million and tax benefit of $8 million for the three months ended March 31, 2024, and 2023, respectively.

Condensed Consolidated Balanc_5

Condensed Consolidated Balance Sheets - Progress Energy - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Current Assets
Cash and cash equivalents	$ 459	$ 253
Receivables of VIEs (net of allowance for doubtful accounts)	2,253	3,019
Receivables (net of allowance for doubtful accounts)	1,646	1,112
Inventory	4,281	4,292
Regulatory assets	3,082	3,648
Other (includes amounts related to VIEs)	359	431
Total current assets	12,091	12,769
Property, Plant and Equipment
Cost	173,926	171,353
Accumulated depreciation and amortization	(57,035)	(56,038)
Net property, plant and equipment	116,891	115,315
Other Noncurrent Assets
Goodwill	19,303	19,303
Regulatory assets	13,636	13,618
Nuclear decommissioning trust funds	10,775	10,143
Operating lease right-of-use assets, net	1,092	1,092
Other	4,072	3,964
Total other noncurrent assets	49,688	48,809
Total Assets	178,670	176,893
Current Liabilities
Accounts payable	3,364	4,228
Taxes accrued	708	816
Interest accrued	798	745
Current maturities of long-term debt	2,274	2,800
Asset retirement obligations	603	596
Regulatory liabilities	1,309	1,369
Other	2,084	2,319
Total current liabilities	15,546	17,283
Long-Term Debt (includes amounts related to VIEs)	74,979	72,452
Other Noncurrent Liabilities
Deferred income taxes	10,721	10,556
Asset retirement obligations	8,487	8,560
Regulatory liabilities	14,571	14,039
Operating lease liabilities	915	917
Accrued pension and other post-retirement benefit costs	473	485
Investment tax credits	862	864
Other	1,352	1,393
Total other noncurrent liabilities	37,507	36,971
Commitments and Contingencies
Equity
Common stock	1	1
Additional paid-in capital	44,937	44,920
Retained earnings	2,542	2,235
Accumulated other comprehensive income (loss)	109	(6)
Total Duke Energy Corporation stockholders' equity	49,551	49,112
Total Liabilities and Equity	178,670	176,893
Progress Energy
Current Assets
Cash and cash equivalents	49	59
Receivables of VIEs (net of allowance for doubtful accounts)	224	225
Receivables (net of allowance for doubtful accounts)	1,256	1,365
Inventory	1,987	1,901
Regulatory assets	1,359	1,661
Other (includes amounts related to VIEs)	122	134
Total current assets	5,000	5,435
Property, Plant and Equipment
Cost	68,755	67,644
Accumulated depreciation and amortization	(22,729)	(22,300)
Net property, plant and equipment	46,026	45,344
Other Noncurrent Assets
Goodwill	3,655	3,655
Regulatory assets	6,526	6,430
Nuclear decommissioning trust funds	4,697	4,457
Operating lease right-of-use assets, net	597	617
Other	1,221	1,156
Total other noncurrent assets	16,696	16,315
Total Assets	67,722	67,094
Current Liabilities
Accounts payable	1,174	1,374
Taxes accrued	201	259
Interest accrued	246	224
Current maturities of long-term debt	659	661
Asset retirement obligations	229	245
Regulatory liabilities	394	418
Other	788	860
Total current liabilities	5,059	5,548
Long-Term Debt (includes amounts related to VIEs)	23,389	22,948
Other Noncurrent Liabilities
Deferred income taxes	5,214	5,197
Asset retirement obligations	3,870	3,900
Regulatory liabilities	5,344	5,083
Operating lease liabilities	530	544
Accrued pension and other post-retirement benefit costs	263	266
Investment tax credits	370	371
Other	238	227
Total other noncurrent liabilities	15,829	15,588
Commitments and Contingencies
Equity
Common stock	0	0
Additional paid-in capital	11,830	11,830
Retained earnings	11,475	11,040
Accumulated other comprehensive income (loss)	(10)	(10)
Total Duke Energy Corporation stockholders' equity	23,295	22,860
Total Liabilities and Equity	67,722	67,094
Progress Energy | Affiliated Entity
Current Assets
Receivables of VIEs (net of allowance for doubtful accounts)	3	90
Current Liabilities
Accounts payable	548	464
Notes payable to affiliated companies	820	1,043
Long-Term Debt (includes amounts related to VIEs)	$ 150	$ 150

Condensed Consolidated Balanc_6

Condensed Consolidated Balance Sheets - Progress Energy (Parenthetical) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Allowance for doubtful accounts - receivables	$ 102	$ 55
Inventory	4,281	4,292
Regulatory assets	3,082	3,648
Current Assets: Other	359	431
Regulatory assets	13,636	13,618
Accounts payable	3,364	4,228
Current maturities of long-term debt	2,274	2,800
Long-Term Debt	74,979	72,452
Other	$ 1,352	$ 1,393
Common stock, par value (in usd per share)	$ 0.001	$ 0.001
Common stock, shares authorized (in shares)	2,000,000,000	2,000,000,000
Common stock, shares outstanding (in shares)	772,000,000	771,000,000
Variable Interest Entity
Allowance for doubtful accounts - receivables of VIEs	$ 102	$ 150
Inventory	470	462
Regulatory assets	110	110
Current Assets: Other	44	90
Regulatory assets	1,616	1,642
Accounts payable	188	188
Current maturities of long-term debt	929	428
Long-Term Debt	2,134	3,000
Other	42	35
Progress Energy
Allowance for doubtful accounts - receivables	20	18
Inventory	1,987	1,901
Regulatory assets	1,359	1,661
Current Assets: Other	122	134
Regulatory assets	6,526	6,430
Accounts payable	1,174	1,374
Current maturities of long-term debt	659	661
Long-Term Debt	23,389	22,948
Other	$ 238	$ 227
Common stock, par value (in usd per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	100	100
Common stock, shares outstanding (in shares)	100	100
Progress Energy | Variable Interest Entity
Allowance for doubtful accounts - receivables of VIEs	$ 53	$ 56
Inventory	470	462
Regulatory assets	98	98
Current Assets: Other	29	68
Regulatory assets	1,423	1,446
Accounts payable	179	188
Current maturities of long-term debt	418	418
Long-Term Debt	1,862	1,910
Other	$ 22	$ 19

Condensed Consolidated State_10

Condensed Consolidated Statements of Cash Flows - Progress Energy - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 1,151	$ 761
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and accretion (including amortization of nuclear fuel)	1,534	1,344
Equity component of AFUDC	(55)	(46)
Impairment of assets and other charges	1	8
Deferred income taxes	149	90
Payments for asset retirement obligations	(115)	(117)
Provision for rate refunds	(4)	(33)
(Increase) decrease in
Receivables	226	754
Inventory	11	(275)
Other current assets	329	262
Increase (decrease) in
Accounts payable	(553)	(1,193)
Taxes accrued	(110)	(148)
Other current liabilities	(208)	(266)
Other assets	41	(13)
Other liabilities	149	157
Net cash provided by operating activities	2,474	1,483
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(3,208)	(3,146)
Purchases of debt and equity securities	(946)	(866)
Proceeds from sales and maturities of debt and equity securities	985	882
Other	(166)	(149)
Net cash used in investing activities	(3,342)	(3,209)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from the issuance of long-term debt	3,481	4,085
Payments for the redemption of long-term debt	(1,392)	(1,380)
Other	(67)	(84)
Net cash provided by financing activities	1,029	1,747
Net increase in cash, cash equivalents and restricted cash	161	21
Cash, cash equivalents and restricted cash at beginning of period	357	603
Cash, cash equivalents and restricted cash at end of period	518	624
Significant non-cash transactions:
Accrued capital expenditures	1,615	1,366
Progress Energy
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	435	359
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and accretion (including amortization of nuclear fuel)	669	554
Equity component of AFUDC	(18)	(16)
Impairment of assets and other charges	0	5
Deferred income taxes	(5)	51
Payments for asset retirement obligations	(68)	(58)
Provision for rate refunds	0	(14)
(Increase) decrease in
Receivables	103	188
Receivables from affiliated companies	87	(2)
Inventory	(86)	(133)
Other current assets	232	319
Increase (decrease) in
Accounts payable	(79)	(214)
Accounts payable to affiliated companies	84	(302)
Taxes accrued	(57)	36
Other current liabilities	(36)	(107)
Other assets	(134)	(212)
Other liabilities	27	4
Net cash provided by operating activities	1,154	458
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(1,373)	(1,275)
Purchases of debt and equity securities	(381)	(279)
Proceeds from sales and maturities of debt and equity securities	424	304
Notes receivable from affiliated companies	0	(118)
Other	(74)	(71)
Net cash used in investing activities	(1,404)	(1,439)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from the issuance of long-term debt	498	996
Payments for the redemption of long-term debt	(73)	(66)
Notes payable to affiliated companies	(223)	2
Other	(1)	(1)
Net cash provided by financing activities	201	931
Net increase in cash, cash equivalents and restricted cash	(49)	(50)
Cash, cash equivalents and restricted cash at beginning of period	135	184
Cash, cash equivalents and restricted cash at end of period	86	134
Significant non-cash transactions:
Accrued capital expenditures	$ 680	$ 516

Condensed Consolidated State_11

Condensed Consolidated Statements of Changes in Equity - Progress Energy - USD ($) $ in Millions	Total		Additional Paid-in Capital	Retained Earnings	Net Unrealized Gains (Losses) on Available-for-Sale Securities	Pension and OPEB Adjustments	Progress Energy	Progress Energy Additional Paid-in Capital	Progress Energy Retained Earnings	Progress Energy Net Gains (Losses) on Cash Flow Hedges	Progress Energy Net Unrealized Gains (Losses) on Available-for-Sale Securities	Progress Energy Pension and OPEB Adjustments
Beginning Balance (Attributable to Parent) at Dec. 31, 2022			$ 44,862	$ 2,637	$ (23)	$ (88)	$ 21,406	$ 11,832	$ 9,585	$ (1)	$ (8)	$ (2)
Beginning Balance (Parent) at Dec. 31, 2022	$ 51,853						21,406
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	761						359		359
Other comprehensive income (loss)	(26)	[1]			6	(1)	2				2
Other	(2)		(2)	0			(2)	(2)
Ending Balance (Attributable to Parent) at Mar. 31, 2023			44,837	2,626	(17)	(89)	21,765	11,830	9,944	(1)	(6)	(2)
Ending Balance (Parent) at Mar. 31, 2023	51,951						21,765
Beginning Balance (Attributable to Parent) at Dec. 31, 2023	49,112		44,920	2,235	(15)	(89)	22,860	11,830	11,040	(1)	(5)	(4)
Beginning Balance (Parent) at Dec. 31, 2023	50,187						22,860
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	1,151						435		435
Other comprehensive income (loss)	115	[1]			(2)	16	0
Other			1
Ending Balance (Attributable to Parent) at Mar. 31, 2024	49,551		$ 44,937	$ 2,542	$ (17)	$ (73)	23,295	$ 11,830	$ 11,475	$ (1)	$ (5)	$ (4)
Ending Balance (Parent) at Mar. 31, 2024	$ 50,638						$ 23,295
[1] Net of income tax expense of approximately $34 million and tax benefit of $8 million for the three months ended March 31, 2024, and 2023, respectively.

Condensed Consolidated State_12

Condensed Consolidated Statements of Operations and Comprehensive Income - Duke Energy Progress - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Operating Revenues	$ 7,671	$ 7,276
Operating Expenses
Operation, maintenance and other	1,379	1,310
Depreciation and amortization	1,387	1,227
Property and other taxes	386	389
Impairment of assets and other charges	1	8
Total operating expenses	5,720	5,609
Gains on Sales of Other Assets and Other, net	12	7
Operating Income	1,963	1,674
Other Income and Expenses, net	186	171
Interest Expense	817	720
Income From Continuing Operations Before Income Taxes	1,332	1,125
Income Tax Expense	178	155
Comprehensive Income Attributable to Duke Energy	1,253	778
Net Income Attributable to Duke Energy Corporation	1,138	804
Duke Energy Progress
Operating Revenues	1,788	1,533
Operating Expenses
Cost of sales	620	545
Operation, maintenance and other	375	350
Depreciation and amortization	339	315
Property and other taxes	51	48
Impairment of assets and other charges	0	4
Total operating expenses	1,385	1,262
Gains on Sales of Other Assets and Other, net	1	0
Operating Income	404	271
Other Income and Expenses, net	36	29
Interest Expense	120	102
Income From Continuing Operations Before Income Taxes	320	198
Income Tax Expense	48	29
Comprehensive Income Attributable to Duke Energy	272	169
Net Income Attributable to Duke Energy Corporation	$ 272	$ 169

Condensed Consolidated Balanc_7

Condensed Consolidated Balance Sheets - Duke Energy Progress - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Current Assets
Cash and cash equivalents	$ 459	$ 253
Receivables of VIEs (net of allowance for doubtful accounts)	2,253	3,019
Receivables (net of allowance for doubtful accounts)	1,646	1,112
Inventory	4,281	4,292
Regulatory assets	3,082	3,648
Other (includes amounts related to VIEs)	359	431
Total current assets	12,091	12,769
Property, Plant and Equipment
Cost	173,926	171,353
Accumulated depreciation and amortization	(57,035)	(56,038)
Net property, plant and equipment	116,891	115,315
Other Noncurrent Assets
Regulatory assets	13,636	13,618
Nuclear decommissioning trust funds	10,775	10,143
Operating lease right-of-use assets, net	1,092	1,092
Other	4,072	3,964
Total other noncurrent assets	49,688	48,809
Total Assets	178,670	176,893
Current Liabilities
Accounts payable	3,364	4,228
Taxes accrued	708	816
Interest accrued	798	745
Current maturities of long-term debt	2,274	2,800
Asset retirement obligations	603	596
Regulatory liabilities	1,309	1,369
Other	2,084	2,319
Total current liabilities	15,546	17,283
Long-Term Debt (includes amounts related to VIEs)	74,979	72,452
Other Noncurrent Liabilities
Deferred income taxes	10,721	10,556
Asset retirement obligations	8,487	8,560
Regulatory liabilities	14,571	14,039
Operating lease liabilities	915	917
Accrued pension and other post-retirement benefit costs	473	485
Investment tax credits	862	864
Other	1,352	1,393
Total other noncurrent liabilities	37,507	36,971
Commitments and Contingencies
Equity
Total Liabilities and Equity	178,670	176,893
Duke Energy Progress
Current Assets
Cash and cash equivalents	27	18
Receivables of VIEs (net of allowance for doubtful accounts)	132	139
Receivables (net of allowance for doubtful accounts)	789	833
Inventory	1,294	1,227
Regulatory assets	834	942
Other (includes amounts related to VIEs)	58	72
Total current assets	3,137	3,247
Property, Plant and Equipment
Cost	39,865	39,283
Accumulated depreciation and amortization	(15,503)	(15,227)
Net property, plant and equipment	24,362	24,056
Other Noncurrent Assets
Regulatory assets	4,631	4,546
Nuclear decommissioning trust funds	4,345	4,075
Operating lease right-of-use assets, net	304	318
Other	715	682
Total other noncurrent assets	9,995	9,621
Total Assets	37,494	36,924
Current Liabilities
Accounts payable	557	634
Taxes accrued	129	176
Interest accrued	89	114
Current maturities of long-term debt	73	72
Asset retirement obligations	228	244
Regulatory liabilities	300	300
Other	429	481
Total current liabilities	2,853	3,244
Long-Term Debt (includes amounts related to VIEs)	11,955	11,492
Other Noncurrent Liabilities
Deferred income taxes	2,555	2,560
Asset retirement obligations	3,619	3,626
Regulatory liabilities	4,635	4,375
Operating lease liabilities	283	293
Accrued pension and other post-retirement benefit costs	144	146
Investment tax credits	128	129
Other	93	102
Total other noncurrent liabilities	11,457	11,231
Commitments and Contingencies
Equity
Total equity	11,079	10,807
Total Liabilities and Equity	37,494	36,924
Duke Energy Progress | Affiliated Entity
Current Assets
Receivables of VIEs (net of allowance for doubtful accounts)	3	16
Current Liabilities
Accounts payable	294	332
Notes payable to affiliated companies	754	891
Long-Term Debt (includes amounts related to VIEs)	$ 150	$ 150

Condensed Consolidated Balanc_8

Condensed Consolidated Balance Sheets - Duke Energy Progress (Parenthetical) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Allowance for doubtful accounts - receivables	$ 102	$ 55
Regulatory assets	3,082	3,648
Current Assets: Other	359	431
Regulatory assets	13,636	13,618
Current maturities of long-term debt	2,274	2,800
Long-Term Debt	74,979	72,452
Other	1,352	1,393
Variable Interest Entity
Allowance for doubtful accounts - receivables of VIEs	102	150
Regulatory assets	110	110
Current Assets: Other	44	90
Regulatory assets	1,616	1,642
Current maturities of long-term debt	929	428
Long-Term Debt	2,134	3,000
Other	42	35
Duke Energy Progress
Allowance for doubtful accounts - receivables	9	8
Regulatory assets	834	942
Current Assets: Other	58	72
Regulatory assets	4,631	4,546
Current maturities of long-term debt	73	72
Long-Term Debt	11,955	11,492
Other	93	102
Duke Energy Progress | Variable Interest Entity
Allowance for doubtful accounts - receivables of VIEs	38	36
Regulatory assets	39	39
Current Assets: Other	18	31
Regulatory assets	633	643
Current maturities of long-term debt	34	34
Long-Term Debt	1,062	1,079
Other	$ 13	$ 12

Condensed Consolidated State_13

Condensed Consolidated Statements of Cash Flows - Duke Energy Progress - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 1,151	$ 761
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and accretion (including amortization of nuclear fuel)	1,534	1,344
Equity component of AFUDC	(55)	(46)
Impairment of assets and other charges	1	8
Deferred income taxes	149	90
Payments for asset retirement obligations	(115)	(117)
Provision for rate refunds	(4)	(33)
(Increase) decrease in
Receivables	226	754
Inventory	11	(275)
Other current assets	329	262
Increase (decrease) in
Accounts payable	(553)	(1,193)
Taxes accrued	(110)	(148)
Other current liabilities	(208)	(266)
Other assets	41	(13)
Other liabilities	149	157
Net cash provided by operating activities	2,474	1,483
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(3,208)	(3,146)
Purchases of debt and equity securities	(946)	(866)
Proceeds from sales and maturities of debt and equity securities	985	882
Other	(166)	(149)
Net cash used in investing activities	(3,342)	(3,209)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from the issuance of long-term debt	3,481	4,085
Payments for the redemption of long-term debt	(1,392)	(1,380)
Other	(67)	(84)
Net cash provided by financing activities	1,029	1,747
Net increase in cash, cash equivalents and restricted cash	161	21
Cash, cash equivalents and restricted cash at beginning of period	357	603
Cash, cash equivalents and restricted cash at end of period	518	624
Significant non-cash transactions:
Accrued capital expenditures	1,615	1,366
Duke Energy Progress
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	272	169
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and accretion (including amortization of nuclear fuel)	385	360
Equity component of AFUDC	(13)	(13)
Impairment of assets and other charges	0	4
Deferred income taxes	(21)	27
Payments for asset retirement obligations	(46)	(46)
Provision for rate refunds	0	(14)
(Increase) decrease in
Receivables	50	144
Receivables from affiliated companies	13	(1)
Inventory	(67)	(76)
Other current assets	97	(61)
Increase (decrease) in
Accounts payable	(31)	(3)
Accounts payable to affiliated companies	(38)	(256)
Taxes accrued	(47)	(21)
Other current liabilities	(49)	(86)
Other assets	(105)	(16)
Other liabilities	(11)	21
Net cash provided by operating activities	389	132
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(704)	(666)
Purchases of debt and equity securities	(351)	(239)
Proceeds from sales and maturities of debt and equity securities	351	236
Notes receivable from affiliated companies	0	(160)
Other	(12)	(33)
Net cash used in investing activities	(716)	(862)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from the issuance of long-term debt	495	991
Payments for the redemption of long-term debt	(33)	(32)
Notes payable to affiliated companies	(137)	(239)
Other	0	(1)
Net cash provided by financing activities	325	719
Net increase in cash, cash equivalents and restricted cash	(2)	(11)
Cash, cash equivalents and restricted cash at beginning of period	51	79
Cash, cash equivalents and restricted cash at end of period	49	68
Significant non-cash transactions:
Accrued capital expenditures	$ 259	$ 176

Condensed Consolidated State_14

Condensed Consolidated Statements of Changes in Equity - Duke Energy Progress - USD ($) $ in Millions	Total	Duke Energy Progress	Duke Energy Progress Member's Equity
Beginning balance at Dec. 31, 2022			$ 10,309
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	$ 804	$ 169	169
Ending balance at Mar. 31, 2023			10,478
Beginning balance at Dec. 31, 2023		10,807	10,807
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	$ 1,138	272	272
Ending balance at Mar. 31, 2024		$ 11,079	$ 11,079

Condensed Consolidated State_15

Condensed Consolidated Statements of Operations and Comprehensive Income - Duke Energy Florida - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2024	Mar. 31, 2023
Operating Revenues		$ 7,671	$ 7,276
Operating Expenses
Operation, maintenance and other		1,379	1,310
Depreciation and amortization		1,387	1,227
Property and other taxes		386	389
Impairment of assets and other charges		1	8
Total operating expenses		5,720	5,609
Gains on Sales of Other Assets and Other, net		12	7
Operating Income		1,963	1,674
Other Income and Expenses, net		186	171
Interest Expense		817	720
Income From Continuing Operations Before Income Taxes		1,332	1,125
Income Tax Expense		178	155
Net Income Attributable to Duke Energy Corporation		1,138	804
Unrealized gains on available-for-sale securities	[1]	(2)	6
Other Comprehensive Income (Loss), net of tax	[1]	115	(26)
Duke Energy Florida
Operating Revenues		1,436	1,510
Operating Expenses
Cost of sales		523	646
Operation, maintenance and other		251	213
Depreciation and amortization		248	190
Property and other taxes		106	120
Impairment of assets and other charges		0	1
Total operating expenses		1,128	1,170
Gains on Sales of Other Assets and Other, net		1	1
Operating Income		309	341
Other Income and Expenses, net		24	30
Interest Expense		111	115
Income From Continuing Operations Before Income Taxes		222	256
Income Tax Expense		43	51
Net Income Attributable to Duke Energy Corporation		179	205
Unrealized gains on available-for-sale securities		0	2
Other Comprehensive Income (Loss), net of tax		$ 179	$ 207
[1] Net of income tax expense of approximately $34 million and tax benefit of $8 million for the three months ended March 31, 2024, and 2023, respectively.

Condensed Consolidated Balanc_9

Condensed Consolidated Balance Sheets - Duke Energy Florida - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Current Assets
Cash and cash equivalents	$ 459	$ 253
Receivables of VIEs (net of allowance for doubtful accounts)	2,253	3,019
Receivables (net of allowance for doubtful accounts)	1,646	1,112
Inventory	4,281	4,292
Regulatory assets	3,082	3,648
Other (includes amounts related to VIEs)	359	431
Total current assets	12,091	12,769
Property, Plant and Equipment
Cost	173,926	171,353
Accumulated depreciation and amortization	(57,035)	(56,038)
Net property, plant and equipment	116,891	115,315
Other Noncurrent Assets
Regulatory assets	13,636	13,618
Nuclear decommissioning trust funds	10,775	10,143
Operating lease right-of-use assets, net	1,092	1,092
Other	4,072	3,964
Total other noncurrent assets	49,688	48,809
Total Assets	178,670	176,893
Current Liabilities
Accounts payable	3,364	4,228
Taxes accrued	708	816
Interest accrued	798	745
Current maturities of long-term debt	2,274	2,800
Asset retirement obligations	603	596
Regulatory liabilities	1,309	1,369
Other	2,084	2,319
Total current liabilities	15,546	17,283
Long-Term Debt (includes amounts related to VIEs)	74,979	72,452
Other Noncurrent Liabilities
Deferred income taxes	10,721	10,556
Asset retirement obligations	8,487	8,560
Regulatory liabilities	14,571	14,039
Operating lease liabilities	915	917
Accrued pension and other post-retirement benefit costs	473	485
Investment tax credits	862	864
Other	1,352	1,393
Total other noncurrent liabilities	37,507	36,971
Commitments and Contingencies
Equity
Accumulated other comprehensive income (loss)	109	(6)
Total Liabilities and Equity	178,670	176,893
Duke Energy Florida
Current Assets
Cash and cash equivalents	4	24
Receivables of VIEs (net of allowance for doubtful accounts)	90	83
Receivables (net of allowance for doubtful accounts)	467	532
Inventory	693	674
Regulatory assets	525	720
Other (includes amounts related to VIEs)	57	51
Total current assets	1,838	2,322
Property, Plant and Equipment
Cost	28,882	28,353
Accumulated depreciation and amortization	(7,219)	(7,067)
Net property, plant and equipment	21,663	21,286
Other Noncurrent Assets
Regulatory assets	1,895	1,883
Nuclear decommissioning trust funds	352	382
Operating lease right-of-use assets, net	294	299
Other	456	429
Total other noncurrent assets	2,997	2,993
Total Assets	26,498	26,601
Current Liabilities
Accounts payable	616	738
Taxes accrued	134	185
Interest accrued	128	86
Current maturities of long-term debt	586	589
Asset retirement obligations	1	1
Regulatory liabilities	93	118
Other	332	350
Total current liabilities	2,077	2,354
Long-Term Debt (includes amounts related to VIEs)	9,791	9,812
Other Noncurrent Liabilities
Deferred income taxes	2,750	2,733
Asset retirement obligations	252	274
Regulatory liabilities	709	708
Operating lease liabilities	247	251
Accrued pension and other post-retirement benefit costs	97	98
Investment tax credits	242	242
Other	111	86
Total other noncurrent liabilities	4,408	4,392
Commitments and Contingencies
Equity
Member's equity	10,227	10,048
Accumulated other comprehensive income (loss)	(5)	(5)
Total equity	10,222	10,043
Total Liabilities and Equity	26,498	26,601
Duke Energy Florida | Affiliated Entity
Current Assets
Receivables of VIEs (net of allowance for doubtful accounts)	2	238
Current Liabilities
Accounts payable	121	135
Notes payable to affiliated companies	$ 66	$ 152

Condensed Consolidated Balan_10

Condensed Consolidated Balance Sheets - Duke Energy Florida (Parenthetical) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Allowance for doubtful accounts - receivables	$ 102	$ 55
Current Assets: Other	359	431
Inventory	4,281	4,292
Regulatory assets	13,636	13,618
Current maturities of long-term debt	2,274	2,800
Long-Term Debt	74,979	72,452
Regulatory assets	3,082	3,648
Accounts payable	3,364	4,228
Other	1,352	1,393
Variable Interest Entity
Allowance for doubtful accounts - receivables of VIEs	102	150
Current Assets: Other	44	90
Inventory	470	462
Regulatory assets	1,616	1,642
Current maturities of long-term debt	929	428
Long-Term Debt	2,134	3,000
Regulatory assets	110	110
Accounts payable	188	188
Other	42	35
Duke Energy Florida
Allowance for doubtful accounts - receivables	12	11
Current Assets: Other	57	51
Inventory	693	674
Regulatory assets	1,895	1,883
Current maturities of long-term debt	586	589
Long-Term Debt	9,791	9,812
Regulatory assets	525	720
Accounts payable	616	738
Other	111	86
Duke Energy Florida | Variable Interest Entity
Allowance for doubtful accounts - receivables of VIEs	15	20
Current Assets: Other	11	37
Inventory	470	462
Regulatory assets	790	803
Current maturities of long-term debt	384	384
Long-Term Debt	800	831
Regulatory assets	59	59
Accounts payable	179	188
Other	$ 10	$ 6

Condensed Consolidated State_16

Condensed Consolidated Statements of Cash Flows - Duke Energy Florida - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 1,151	$ 761
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and accretion (including amortization of nuclear fuel)	1,534	1,344
Equity component of AFUDC	(55)	(46)
Losses on sales of other assets	12	7
Impairment of assets and other charges	1	8
Deferred income taxes	149	90
Payments for asset retirement obligations	(115)	(117)
(Increase) decrease in
Receivables	226	754
Inventory	11	(275)
Other current assets	329	262
Increase (decrease) in
Accounts payable	(553)	(1,193)
Taxes accrued	(110)	(148)
Other current liabilities	(208)	(266)
Other assets	41	(13)
Other liabilities	149	157
Net cash provided by operating activities	2,474	1,483
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(3,208)	(3,146)
Purchases of debt and equity securities	(946)	(866)
Proceeds from sales and maturities of debt and equity securities	985	882
Other	(166)	(149)
Net cash used in investing activities	(3,342)	(3,209)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from the issuance of long-term debt	3,481	4,085
Payments for the redemption of long-term debt	(1,392)	(1,380)
Other	(67)	(84)
Net cash provided by financing activities	1,029	1,747
Net increase in cash, cash equivalents and restricted cash	161	21
Cash, cash equivalents and restricted cash at beginning of period	357	603
Cash, cash equivalents and restricted cash at end of period	518	624
Significant non-cash transactions:
Accrued capital expenditures	1,615	1,366
Duke Energy Florida
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	179	205
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and accretion (including amortization of nuclear fuel)	284	194
Equity component of AFUDC	(5)	(3)
Impairment of assets and other charges	0	1
Deferred income taxes	10	21
Payments for asset retirement obligations	(22)	(12)
(Increase) decrease in
Receivables	53	42
Receivables from affiliated companies	236	(1)
Inventory	(19)	(57)
Other current assets	132	363
Increase (decrease) in
Accounts payable	(48)	(211)
Accounts payable to affiliated companies	(14)	(67)
Taxes accrued	(51)	79
Other current liabilities	11	(27)
Other assets	(16)	(193)
Other liabilities	34	(8)
Net cash provided by operating activities	764	326
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(669)	(609)
Purchases of debt and equity securities	(30)	(40)
Proceeds from sales and maturities of debt and equity securities	73	68
Other	(62)	(38)
Net cash used in investing activities	(688)	(619)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from the issuance of long-term debt	3	5
Payments for the redemption of long-term debt	(39)	(34)
Notes payable to affiliated companies	(86)	281
Other	(1)	(1)
Net cash provided by financing activities	(123)	251
Net increase in cash, cash equivalents and restricted cash	(47)	(42)
Cash, cash equivalents and restricted cash at beginning of period	67	86
Cash, cash equivalents and restricted cash at end of period	20	44
Significant non-cash transactions:
Accrued capital expenditures	$ 421	$ 340

Condensed Consolidated State_17

Condensed Consolidated Statements of Changes in Equity - Duke Energy Florida - USD ($) $ in Millions	Total		Duke Energy Florida	Duke Energy Florida Member's Equity	Duke Energy Florida Net Unrealized Gains (Losses) on Available-for-Sale Securities
Beginning balance at Dec. 31, 2022			$ 9,023	$ 9,031	$ (8)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	$ 804		205	205
Other comprehensive income (loss)	6	[1]	2		2
Other	(2)		1	1
Ending balance at Mar. 31, 2023			9,231	9,237	(6)
Beginning balance at Dec. 31, 2023			10,043	10,048	(5)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	1,138		179	179
Other comprehensive income (loss)	$ (2)	[1]	0
Ending balance at Mar. 31, 2024			$ 10,222	$ 10,227	$ (5)
[1] Net of income tax expense of approximately $34 million and tax benefit of $8 million for the three months ended March 31, 2024, and 2023, respectively.

Condensed Consolidated State_18

Condensed Consolidated Statements of Operations and Comprehensive Income - Duke Energy Ohio - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Regulated electric	$ 6,732	$ 6,324
Regulated natural gas	866	882
Total operating revenues	7,671	7,276
Operating Expenses
Operation, maintenance and other	1,379	1,310
Depreciation and amortization	1,387	1,227
Property and other taxes	386	389
Total operating expenses	5,720	5,609
Operating Income	1,963	1,674
Other Income and Expenses, net	186	171
Interest Expense	817	720
Income From Continuing Operations Before Income Taxes	1,332	1,125
Income Tax Expense From Continuing Operations	178	155
Comprehensive Income Attributable to Duke Energy	1,253	778
Net Income Attributable to Duke Energy Corporation	1,138	804
Fuel used in electric generation and purchased power
Operating Expenses
Cost of sales	2,335	2,377
Cost of natural gas
Operating Expenses
Cost of sales	232	298
Duke Energy Ohio
Regulated electric	458	474
Regulated natural gas	220	235
Total operating revenues	678	709
Operating Expenses
Operation, maintenance and other	126	123
Depreciation and amortization	99	90
Property and other taxes	102	80
Total operating expenses	526	561
Operating Income	152	148
Other Income and Expenses, net	6	8
Interest Expense	45	36
Income From Continuing Operations Before Income Taxes	113	120
Income Tax Expense From Continuing Operations	19	20
Comprehensive Income Attributable to Duke Energy	94	100
Net Income Attributable to Duke Energy Corporation	94	100
Duke Energy Ohio | Fuel used in electric generation and purchased power
Operating Expenses
Cost of sales	138	176
Duke Energy Ohio | Cost of natural gas
Operating Expenses
Cost of sales	$ 61	$ 92

Condensed Consolidated Balan_11

Condensed Consolidated Balance Sheets - Duke Energy Ohio - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Current Assets
Cash and cash equivalents	$ 459	$ 253
Receivables of VIEs (net of allowance for doubtful accounts)	2,253	3,019
Inventory	4,281	4,292
Regulatory assets	3,082	3,648
Other (includes amounts related to VIEs)	359	431
Total current assets	12,091	12,769
Property, Plant and Equipment
Cost	173,926	171,353
Accumulated depreciation and amortization	(57,035)	(56,038)
Net property, plant and equipment	116,891	115,315
Other Noncurrent Assets
Goodwill	19,303	19,303
Regulatory assets	13,636	13,618
Operating lease right-of-use assets, net	1,092	1,092
Other	4,072	3,964
Total other noncurrent assets	49,688	48,809
Total Assets	178,670	176,893
Current Liabilities
Accounts payable	3,364	4,228
Taxes accrued	708	816
Interest accrued	798	745
Asset retirement obligations	603	596
Regulatory liabilities	1,309	1,369
Other	2,084	2,319
Total current liabilities	15,546	17,283
Long-Term Debt (includes amounts related to VIEs)	74,979	72,452
Other Noncurrent Liabilities
Deferred income taxes	10,721	10,556
Asset retirement obligations	8,487	8,560
Regulatory liabilities	14,571	14,039
Operating lease liabilities	915	917
Accrued pension and other post-retirement benefit costs	473	485
Other	1,352	1,393
Total other noncurrent liabilities	37,507	36,971
Commitments and Contingencies
Equity
Common stock	1	1
Additional paid-in capital	44,937	44,920
Retained earnings	2,542	2,235
Total Duke Energy Corporation stockholders' equity	49,551	49,112
Total Liabilities and Equity	178,670	176,893
Duke Energy Ohio
Current Assets
Cash and cash equivalents	5	24
Receivables of VIEs (net of allowance for doubtful accounts)	437	112
Inventory	185	179
Regulatory assets	75	73
Other (includes amounts related to VIEs)	17	134
Total current assets	722	761
Property, Plant and Equipment
Cost	13,378	13,210
Accumulated depreciation and amortization	(3,507)	(3,451)
Net property, plant and equipment	9,871	9,759
Other Noncurrent Assets
Goodwill	920	920
Regulatory assets	678	676
Operating lease right-of-use assets, net	16	16
Other	98	84
Total other noncurrent assets	1,712	1,696
Total Assets	12,305	12,216
Current Liabilities
Accounts payable	288	338
Taxes accrued	249	316
Interest accrued	51	35
Asset retirement obligations	7	6
Regulatory liabilities	40	56
Other	64	65
Total current liabilities	1,074	1,500
Long-Term Debt (includes amounts related to VIEs)	3,914	3,493
Other Noncurrent Liabilities
Deferred income taxes	1,282	1,272
Asset retirement obligations	134	130
Regulatory liabilities	481	497
Operating lease liabilities	16	16
Accrued pension and other post-retirement benefit costs	98	97
Other	87	86
Total other noncurrent liabilities	2,098	2,098
Commitments and Contingencies
Equity
Common stock	762	762
Additional paid-in capital	3,100	3,100
Retained earnings	1,332	1,238
Total Duke Energy Corporation stockholders' equity	5,194	5,100
Total Liabilities and Equity	12,305	12,216
Duke Energy Ohio | Affiliated Entity
Current Assets
Receivables of VIEs (net of allowance for doubtful accounts)	3	239
Current Liabilities
Accounts payable	69	71
Notes payable to affiliated companies	306	613
Long-Term Debt (includes amounts related to VIEs)	$ 25	$ 25

Condensed Consolidated Balan_12

Condensed Consolidated Balance Sheets - Duke Energy Ohio (Parenthetical) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Allowance for doubtful accounts - receivables	$ 102	$ 55
Common stock, par value (in usd per share)	$ 0.001	$ 0.001
Common stock, shares authorized (in shares)	2,000,000,000	2,000,000,000
Common stock, shares outstanding (in shares)	772,000,000	771,000,000
Duke Energy Ohio
Allowance for doubtful accounts - receivables	$ 41	$ 9
Common stock, par value (in usd per share)	$ 8.50	$ 8.50
Common stock, shares authorized (in shares)	120,000,000	120,000,000
Common stock, shares outstanding (in shares)	90,000,000	90,000,000

Condensed Consolidated State_19

Condensed Consolidated Statements of Cash Flows - Duke Energy Ohio - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 1,151	$ 761
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and accretion (including amortization of nuclear fuel)	1,534	1,344
Deferred income taxes	149	90
Payments for asset retirement obligations	(115)	(117)
(Increase) decrease in
Receivables	226	754
Inventory	11	(275)
Other current assets	329	262
Increase (decrease) in
Accounts payable	(553)	(1,193)
Taxes accrued	(110)	(148)
Other current liabilities	(208)	(266)
Other assets	41	(13)
Other liabilities	149	157
Net cash provided by operating activities	2,474	1,483
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(3,208)	(3,146)
Other	(166)	(149)
Net cash used in investing activities	(3,342)	(3,209)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from the issuance of long-term debt	3,481	4,085
Other	(67)	(84)
Net cash provided by financing activities	1,029	1,747
Net increase in cash, cash equivalents and restricted cash	161	21
Cash, cash equivalents and restricted cash at beginning of period	357	603
Cash, cash equivalents and restricted cash at end of period	518	624
Significant non-cash transactions:
Accrued capital expenditures	1,615	1,366
Duke Energy Ohio
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	94	100
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and accretion (including amortization of nuclear fuel)	100	91
Deferred income taxes	2	(3)
Payments for asset retirement obligations	(1)	(1)
(Increase) decrease in
Receivables	12	0
Receivables from affiliated companies	65	17
Inventory	(5)	(11)
Other current assets	100	94
Increase (decrease) in
Accounts payable	(20)	(60)
Accounts payable to affiliated companies	(2)	(7)
Taxes accrued	(67)	(90)
Other current liabilities	(7)	(42)
Other assets	7	1
Other liabilities	(17)	(1)
Net cash provided by operating activities	261	88
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(217)	(232)
Losses on sales of other assets	0	75
Notes receivable from affiliated companies	(166)	(224)
Other	(10)	(16)
Net cash used in investing activities	(393)	(397)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from the issuance of long-term debt	424	749
Notes payable to affiliated companies	(307)	(425)
Other	(4)	(5)
Net cash provided by financing activities	113	319
Net increase in cash, cash equivalents and restricted cash	(19)	10
Cash, cash equivalents and restricted cash at beginning of period	24	16
Cash, cash equivalents and restricted cash at end of period	5	26
Significant non-cash transactions:
Accrued capital expenditures	$ 84	$ 87

Condensed Consolidated State_20

Condensed Consolidated Statements of Changes in Equity - Duke Energy Ohio - USD ($) $ in Millions	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Duke Energy Ohio	Duke Energy Ohio Common Stock	Duke Energy Ohio Additional Paid-in Capital	Duke Energy Ohio Retained Earnings
Beginning Balance (Attributable to Parent) at Dec. 31, 2022		$ 1	$ 44,862	$ 2,637	$ 4,766	$ 762	$ 3,100	$ 904
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	$ 804				100			100
Ending Balance (Attributable to Parent) at Mar. 31, 2023		1	44,837	2,626	4,866	762	3,100	1,004
Beginning Balance (Attributable to Parent) at Dec. 31, 2023	49,112	1	44,920	2,235	5,100	762	3,100	1,238
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	1,138				94			94
Ending Balance (Attributable to Parent) at Mar. 31, 2024	$ 49,551	$ 1	$ 44,937	$ 2,542	$ 5,194	$ 762	$ 3,100	$ 1,332

Condensed Consolidated State_21

Condensed Consolidated Statements of Operations and Comprehensive Income - Duke Energy Indiana - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2024	Mar. 31, 2023
Operating Revenues		$ 7,671	$ 7,276
Operating Expenses
Operation, maintenance and other		1,379	1,310
Depreciation and amortization		1,387	1,227
Property and other taxes		386	389
Total operating expenses		5,720	5,609
Operating Income		1,963	1,674
Other Income and Expenses, net		186	171
Interest Expense		817	720
Income From Continuing Operations Before Income Taxes		1,332	1,125
Income Tax Expense From Continuing Operations		178	155
Net Income Attributable to Duke Energy Corporation		1,138	804
Other comprehensive income (loss)	[1]	115	(26)
Comprehensive Income		1,266	735
Duke Energy Indiana
Operating Revenues		759	975
Operating Expenses
Cost of sales		271	449
Operation, maintenance and other		180	184
Depreciation and amortization		169	158
Property and other taxes		14	18
Total operating expenses		634	809
Operating Income		125	166
Other Income and Expenses, net		13	14
Interest Expense		57	52
Income From Continuing Operations Before Income Taxes		81	128
Income Tax Expense From Continuing Operations		14	22
Net Income Attributable to Duke Energy Corporation		67	106
Other comprehensive income (loss)		(1)	0
Comprehensive Income		$ 66	$ 106
[1] Net of income tax expense of approximately $34 million and tax benefit of $8 million for the three months ended March 31, 2024, and 2023, respectively.

Condensed Consolidated Balan_13

Condensed Consolidated Balance Sheets - Duke Energy Indiana - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Current Assets
Cash and cash equivalents	$ 459	$ 253
Receivables of VIEs (net of allowance for doubtful accounts)	2,253	3,019
Inventory	4,281	4,292
Regulatory assets	3,082	3,648
Total current assets	12,091	12,769
Property, Plant and Equipment
Cost	173,926	171,353
Accumulated depreciation and amortization	(57,035)	(56,038)
Net property, plant and equipment	116,891	115,315
Other Noncurrent Assets
Regulatory assets	13,636	13,618
Operating lease right-of-use assets, net	1,092	1,092
Other	4,072	3,964
Total other noncurrent assets	49,688	48,809
Total Assets	178,670	176,893
Current Liabilities
Accounts payable	3,364	4,228
Taxes accrued	708	816
Interest accrued	798	745
Current maturities of long-term debt	2,274	2,800
Asset retirement obligations	603	596
Regulatory liabilities	1,309	1,369
Other	2,084	2,319
Total current liabilities	15,546	17,283
Long-Term Debt (includes amounts related to VIEs)	74,979	72,452
Other Noncurrent Liabilities
Deferred income taxes	10,721	10,556
Asset retirement obligations	8,487	8,560
Regulatory liabilities	14,571	14,039
Operating lease liabilities	915	917
Accrued pension and other post-retirement benefit costs	473	485
Investment tax credits	862	864
Other	1,352	1,393
Total other noncurrent liabilities	37,507	36,971
Commitments and Contingencies
Equity
Accumulated other comprehensive income (loss)	109	(6)
Total Liabilities and Equity	178,670	176,893
Duke Energy Indiana
Current Assets
Cash and cash equivalents	5	8
Receivables of VIEs (net of allowance for doubtful accounts)	429	156
Inventory	534	582
Regulatory assets	101	102
Other	59	98
Total current assets	1,140	1,143
Property, Plant and Equipment
Cost	19,097	18,900
Accumulated depreciation and amortization	(6,598)	(6,501)
Net property, plant and equipment	12,499	12,399
Other Noncurrent Assets
Regulatory assets	900	894
Operating lease right-of-use assets, net	48	50
Other	353	325
Total other noncurrent assets	1,301	1,269
Total Assets	14,940	14,811
Current Liabilities
Accounts payable	234	300
Taxes accrued	75	66
Interest accrued	73	54
Current maturities of long-term debt	4	4
Asset retirement obligations	131	120
Regulatory liabilities	213	209
Other	179	184
Total current liabilities	1,123	1,369
Long-Term Debt (includes amounts related to VIEs)	4,646	4,348
Other Noncurrent Liabilities
Deferred income taxes	1,476	1,436
Asset retirement obligations	672	689
Regulatory liabilities	1,450	1,459
Operating lease liabilities	45	46
Accrued pension and other post-retirement benefit costs	101	115
Investment tax credits	186	186
Other	13	0
Total other noncurrent liabilities	3,943	3,931
Commitments and Contingencies
Equity
Member's equity	5,078	5,012
Accumulated other comprehensive income (loss)	0	1
Total equity	5,078	5,013
Total Liabilities and Equity	14,940	14,811
Duke Energy Indiana | Affiliated Entity
Current Assets
Receivables of VIEs (net of allowance for doubtful accounts)	12	197
Current Liabilities
Accounts payable	78	176
Notes payable to affiliated companies	136	256
Long-Term Debt (includes amounts related to VIEs)	$ 150	$ 150

Condensed Consolidated Balan_14

Condensed Consolidated Balance Sheets - Duke Energy Indiana (Parenthetical) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Allowance for doubtful accounts - receivables	$ 102	$ 55
Duke Energy Indiana
Allowance for doubtful accounts - receivables	$ 16	$ 5

Condensed Consolidated State_22

Condensed Consolidated Statements of Cash Flows - Duke Energy Indiana - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 1,151	$ 761
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and accretion (including amortization of nuclear fuel)	1,534	1,344
Equity component of AFUDC	(55)	(46)
Deferred income taxes	149	90
Payments for asset retirement obligations	115	117
(Increase) decrease in
Receivables	226	754
Inventory	11	(275)
Other current assets	329	262
Increase (decrease) in
Accounts payable	(553)	(1,193)
Taxes accrued	(110)	(148)
Other current liabilities	(208)	(266)
Other assets	41	(13)
Other liabilities	149	157
Net cash provided by operating activities	2,474	1,483
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(3,208)	(3,146)
Purchases of debt and equity securities	(946)	(866)
Proceeds from sales and maturities of debt and equity securities	985	882
Other	(166)	(149)
Net cash used in investing activities	(3,342)	(3,209)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from the issuance of long-term debt	3,481	4,085
Payments for the redemption of long-term debt	(1,392)	(1,380)
Other	(67)	(84)
Net cash provided by financing activities	1,029	1,747
Net increase in cash, cash equivalents and restricted cash	161	21
Cash, cash equivalents and restricted cash at beginning of period	357	603
Cash, cash equivalents and restricted cash at end of period	518	624
Significant non-cash transactions:
Accrued capital expenditures	1,615	1,366
Duke Energy Indiana
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	67	106
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and accretion (including amortization of nuclear fuel)	170	158
Equity component of AFUDC	(2)	(1)
Deferred income taxes	24	2
Payments for asset retirement obligations	12	19
(Increase) decrease in
Receivables	35	20
Receivables from affiliated companies	(6)	(26)
Inventory	48	(71)
Other current assets	30	174
Increase (decrease) in
Accounts payable	(39)	(107)
Accounts payable to affiliated companies	(57)	(33)
Taxes accrued	9	14
Other current liabilities	32	112
Other assets	(13)	(12)
Other liabilities	(7)	35
Net cash provided by operating activities	279	352
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(275)	(226)
Purchases of debt and equity securities	(5)	(23)
Proceeds from sales and maturities of debt and equity securities	4	16
Notes receivable from affiliated companies	(117)	96
Other	(24)	(10)
Net cash used in investing activities	(417)	(147)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from the issuance of long-term debt	298	495
Payments for the redemption of long-term debt	0	(300)
Notes payable to affiliated companies	(120)	(231)
Distributions to parent	(42)	(188)
Other	(1)	(1)
Net cash provided by financing activities	135	(225)
Net increase in cash, cash equivalents and restricted cash	(3)	(20)
Cash, cash equivalents and restricted cash at beginning of period	8	31
Cash, cash equivalents and restricted cash at end of period	5	11
Significant non-cash transactions:
Accrued capital expenditures	$ 88	$ 85

Condensed Consolidated State_23

Condensed Consolidated Statements of Changes in Equity - Duke Energy Indiana - USD ($) $ in Millions	Total	Duke Energy Indiana	Duke Energy Indiana Member's Equity	Duke Energy Indiana Pension and OPEB Adjustments
Beginning balance at Dec. 31, 2022		$ 4,703	$ 4,702	$ 1
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	$ 804	106	106
Distributions to parent	(776)	(75)	(75)
Other	(2)
Ending balance at Mar. 31, 2023		4,734	4,733	1
Beginning balance at Dec. 31, 2023		5,013	5,012	1
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	1,138	67	67
Distributions to parent	$ (792)
Other		(2)	(1)	$ (1)
Ending balance at Mar. 31, 2024		$ 5,078	$ 5,078

Condensed Consolidated State_24

Condensed Consolidated Statements of Operations and Comprehensive Income - Piedmont - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Operating Revenues	$ 7,671	$ 7,276
Operating Expenses
Operation, maintenance and other	1,379	1,310
Depreciation and amortization	1,387	1,227
Property and other taxes	386	389
Impairment of assets and other charges	1	8
Total operating expenses	5,720	5,609
Operating Income	1,963	1,674
Other Income and Expenses, net	186	171
Interest Expense	817	720
Income From Continuing Operations Before Income Taxes	1,332	1,125
Income Tax Expense From Continuing Operations	178	155
Net Income Attributable to Duke Energy Corporation	1,138	804
Comprehensive Income Attributable to Duke Energy	1,253	778
Piedmont
Operating Revenues	676	675
Operating Expenses
Cost of natural gas	170	206
Operation, maintenance and other	95	89
Depreciation and amortization	62	57
Property and other taxes	15	16
Impairment of assets and other charges	0	1
Total operating expenses	342	369
Operating Income	334	306
Other Income and Expenses, net	17	16
Interest Expense	45	40
Income From Continuing Operations Before Income Taxes	306	282
Income Tax Expense From Continuing Operations	60	50
Net Income Attributable to Duke Energy Corporation	246	232
Comprehensive Income Attributable to Duke Energy	$ 246	$ 232

Condensed Consolidated Balan_15

Condensed Consolidated Balance Sheets - Piedmont - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Current Assets
Receivables of VIEs (net of allowance for doubtful accounts)	$ 2,253	$ 3,019
Inventory	4,281	4,292
Regulatory assets	3,082	3,648
Other (includes amounts related to VIEs)	359	431
Total current assets	12,091	12,769
Property, Plant and Equipment
Cost	173,926	171,353
Accumulated depreciation and amortization	(57,035)	(56,038)
Net property, plant and equipment	116,891	115,315
Other Noncurrent Assets
Goodwill	19,303	19,303
Regulatory assets	13,636	13,618
Operating lease right-of-use assets, net	1,092	1,092
Investments in equity method unconsolidated affiliates	502	492
Other	4,072	3,964
Total other noncurrent assets	49,688	48,809
Total Assets	178,670	176,893
Current Liabilities
Accounts payable	3,364	4,228
Taxes accrued	708	816
Interest accrued	798	745
Current maturities of long-term debt	2,274	2,800
Regulatory liabilities	1,309	1,369
Other	2,084	2,319
Total current liabilities	15,546	17,283
Long-Term Debt (includes amounts related to VIEs)	74,979	72,452
Other Noncurrent Liabilities
Deferred income taxes	10,721	10,556
Asset retirement obligations	8,487	8,560
Regulatory liabilities	14,571	14,039
Operating lease liabilities	915	917
Accrued pension and other post-retirement benefit costs	473	485
Other	1,352	1,393
Total other noncurrent liabilities	37,507	36,971
Commitments and Contingencies
Equity
Common stock	1	1
Retained earnings	2,542	2,235
Total Duke Energy Corporation stockholders' equity	49,551	49,112
Noncontrolling interests	1,087	1,075
Total equity	50,638	50,187
Total Liabilities and Equity	178,670	176,893
Piedmont
Current Assets
Receivables of VIEs (net of allowance for doubtful accounts)	297	311
Inventory	65	112
Regulatory assets	131	161
Other (includes amounts related to VIEs)	9	7
Total current assets	514	601
Property, Plant and Equipment
Cost	12,157	11,908
Accumulated depreciation and amortization	(2,296)	(2,259)
Net property, plant and equipment	9,861	9,649
Other Noncurrent Assets
Goodwill	49	49
Regulatory assets	403	410
Operating lease right-of-use assets, net	5	4
Investments in equity method unconsolidated affiliates	78	78
Other	282	276
Total other noncurrent assets	817	817
Total Assets	11,192	11,067
Current Liabilities
Accounts payable	246	315
Taxes accrued	101	89
Interest accrued	48	39
Current maturities of long-term debt	40	40
Regulatory liabilities	88	98
Other	64	77
Total current liabilities	1,151	1,250
Long-Term Debt (includes amounts related to VIEs)	3,629	3,628
Other Noncurrent Liabilities
Deferred income taxes	930	933
Asset retirement obligations	26	26
Regulatory liabilities	973	988
Operating lease liabilities	10	10
Accrued pension and other post-retirement benefit costs	7	8
Other	168	172
Total other noncurrent liabilities	2,114	2,137
Commitments and Contingencies
Equity
Common stock	1,635	1,635
Retained earnings	2,662	2,416
Total Duke Energy Corporation stockholders' equity	4,297	4,051
Noncontrolling interests	1	1
Total equity	4,298	4,052
Total Liabilities and Equity	11,192	11,067
Piedmont | Affiliated Entity
Current Assets
Receivables of VIEs (net of allowance for doubtful accounts)	12	10
Current Liabilities
Accounts payable	56	54
Notes payable to affiliated companies	$ 508	$ 538

Condensed Consolidated Balan_16

Condensed Consolidated Balance Sheets - Piedmont (Parenthetical) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Allowance for doubtful accounts - receivables	$ 102	$ 55
Common stock, shares authorized (in shares)	2,000,000,000	2,000,000,000
Common stock, shares outstanding (in shares)	772,000,000	771,000,000
Piedmont
Allowance for doubtful accounts - receivables	$ 12	$ 11
Common stock, shares authorized (in shares)	100	100
Common stock, shares outstanding (in shares)	100	100

Condensed Consolidated State_25

Condensed Consolidated Statements of Cash Flows - Duke Energy Piedmont - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 1,151	$ 761
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and accretion (including amortization of nuclear fuel)	1,534	1,344
Equity component of AFUDC	(55)	(46)
Impairment of assets and other charges	1	8
Deferred income taxes	149	90
Equity in earnings of unconsolidated affiliates	(17)	(20)
(Increase) decrease in
Receivables	226	754
Inventory	11	(275)
Other current assets	329	262
Increase (decrease) in
Accounts payable	(553)	(1,193)
Taxes accrued	(110)	(148)
Other current liabilities	(208)	(266)
Other assets	41	(13)
Other liabilities	149	157
Net cash provided by operating activities	2,474	1,483
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(3,208)	(3,146)
Other	(166)	(149)
Net cash used in investing activities	(3,342)	(3,209)
CASH FLOWS FROM FINANCING ACTIVITIES
Net cash provided by financing activities	1,029	1,747
Net increase in cash, cash equivalents and restricted cash	161	21
Cash, cash equivalents and restricted cash at beginning of period	357	603
Cash, cash equivalents and restricted cash at end of period	518	624
Significant non-cash transactions:
Accrued capital expenditures	1,615	1,366
Piedmont
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	246	232
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and accretion (including amortization of nuclear fuel)	63	58
Equity component of AFUDC	(6)	(5)
Impairment of assets and other charges	0	1
Deferred income taxes	(15)	14
Equity in earnings of unconsolidated affiliates	(2)	(2)
(Increase) decrease in
Receivables	13	189
Receivables from affiliated companies	(2)	0
Inventory	48	73
Other current assets	20	(19)
Increase (decrease) in
Accounts payable	(43)	(107)
Accounts payable to affiliated companies	2	(12)
Taxes accrued	12	(13)
Other current liabilities	(1)	42
Other assets	(2)	(2)
Other liabilities	9	(1)
Net cash provided by operating activities	342	448
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(294)	(271)
Other	(18)	(6)
Net cash used in investing activities	(312)	(277)
CASH FLOWS FROM FINANCING ACTIVITIES
Notes payable to affiliated companies	(30)	(171)
Net cash provided by financing activities	(30)	(171)
Net increase in cash, cash equivalents and restricted cash	0	0
Cash, cash equivalents and restricted cash at beginning of period	0	0
Cash, cash equivalents and restricted cash at end of period	0	0
Significant non-cash transactions:
Accrued capital expenditures	$ 195	$ 160

Condensed Consolidated State_26

Condensed Consolidated Statements of Changes in Equity - Piedmont - USD ($) $ in Millions	Total	Common Stock	Retained Earnings	Total Equity	Noncontrolling Interests	Piedmont	Piedmont Common Stock	Piedmont Retained Earnings	Piedmont Total Equity	Piedmont Noncontrolling Interests
Beginning Balance (Attributable to Parent) at Dec. 31, 2022		$ 1	$ 2,637	$ 49,322			$ 1,635	$ 2,037	$ 3,672
Beginning Balance (Attributable to Noncontrolling Interest) at Dec. 31, 2022					$ 2,531					$ 1
Beginning Balance (Parent) at Dec. 31, 2022	$ 51,853					$ 3,673
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	761					232		232	232
Ending Balance (Attributable to Parent) at Mar. 31, 2023		1	2,626	49,260			1,635	2,269	3,904
Ending Balance (Attributable to Noncontrolling Interest) at Mar. 31, 2023					2,691					1
Ending Balance (Parent) at Mar. 31, 2023	51,951					3,905
Beginning Balance (Attributable to Parent) at Dec. 31, 2023	49,112	1	2,235	49,112		4,051	1,635	2,416	4,051
Beginning Balance (Attributable to Noncontrolling Interest) at Dec. 31, 2023	1,075				1,075	1				1
Beginning Balance (Parent) at Dec. 31, 2023	50,187					4,052
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	1,151					246		246	246
Ending Balance (Attributable to Parent) at Mar. 31, 2024	49,551	$ 1	$ 2,542	$ 49,551		4,297	$ 1,635	$ 2,662	$ 4,297
Ending Balance (Attributable to Noncontrolling Interest) at Mar. 31, 2024	1,087				$ 1,087	1				$ 1
Ending Balance (Parent) at Mar. 31, 2024	$ 50,638					$ 4,298

Organization and Basis of Prese

Organization and Basis of Presentation	3 Months Ended
	Mar. 31, 2024
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization and Basis of Presentation	ORGANIZATION AND 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's Annual Report on Form 10-K for the year ended December 31, 2023. 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. Discontinued Operations Duke Energy has elected to present cash flows of discontinued operations combined with cash flows of continuing operations. Unless otherwise noted, the notes to these condensed consolidated financial statements exclude amounts related to discontinued operations for all periods presented. For the three months ended March 31, 2024, and 2023, the Loss From Discontinued Operations, net of tax on Duke Energy's Condensed Consolidated Statements of Operations includes amounts related to noncontrolling interests. A portion of Noncontrolling interests on Duke Energy's Condensed Consolidated Balance Sheets relates to discontinued operations for the periods presented. See Note 2 for discussion of discontinued operations related to the Commercial Renewables Disposal Groups. NONCONTROLLING INTEREST Duke Energy maintains a controlling financial interest in certain less than wholly owned 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 Sheets. 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. CASH, CASH EQUIVALENTS AND RESTRICTED CASH Duke Energy, Duke Energy Carolinas, Progress Energy, Duke Energy Progress 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. March 31, 2024 December 31, 2023 Duke Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Duke Energy Progress Energy Energy Energy Carolinas Energy Progress Florida Energy Carolinas Energy Progress Florida Current Assets Cash and cash equivalents $ 459 $ 5 $ 49 $ 27 $ 4 $ 253 $ 9 $ 59 $ 18 $ 24 Other 33 6 27 18 9 76 9 67 31 36 Other Noncurrent Assets Other 17 1 10 4 7 16 1 9 2 7 Total cash, cash equivalents and restricted cash $ 509 $ 12 $ 86 $ 49 $ 20 $ 345 $ 19 $ 135 $ 51 $ 67 INVENTORY Provisions for inventory write-offs were not material at March 31, 2024, and December 31, 2023. The components of inventory are presented in the tables below. March 31, 2024 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 $ 3,130 $ 1,078 $ 1,547 $ 1,039 $ 508 $ 146 $ 316 $ 12 Coal 840 357 240 150 90 27 216 — Natural gas, oil and other fuel 311 43 200 105 95 12 2 53 Total inventory $ 4,281 $ 1,478 $ 1,987 $ 1,294 $ 693 $ 185 $ 534 $ 65 December 31, 2023 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 $ 3,086 $ 1,075 $ 1,465 $ 963 $ 502 $ 139 $ 361 $ 12 Coal 842 364 231 154 77 28 219 — Natural gas, oil and other fuel 364 45 205 110 95 12 2 100 Total inventory $ 4,292 $ 1,484 $ 1,901 $ 1,227 $ 674 $ 179 $ 582 $ 112 OTHER NONCURRENT ASSETS Duke Energy, through a nonregulated subsidiary, was the winner of the Carolina Long Bay offshore wind auction in May 2022 and recorded an asset of $150 million related to the arrangement in Other within Other noncurrent assets on the Consolidated Balance Sheets as of March 31, 2024, and December 31, 2023. The asset is recorded in the EU&I segment at historical cost and is subject to impairment testing should circumstances indicate the carrying value may not be recoverable. ACCOUNTS PAYABLE Duke Energy has a voluntary supply chain finance program (the “program”) that allows Duke Energy suppliers, at their sole discretion, to sell their receivables from Duke Energy to a global financial institution at a rate that leverages Duke Energy’s credit rating and which may result in favorable terms compared to the rate available to the supplier on their own credit rating. Suppliers participating in the program determine at their sole discretion, which invoices they will sell to the financial institution. Suppliers’ decisions on which invoices are sold do not impact Duke Energy’s payment terms, which are based on commercial terms negotiated between Duke Energy and the supplier regardless of program participation. The commercial terms negotiated between Duke Energy and its suppliers are consistent regardless of whether the supplier elects to participate in the program. Duke Energy does not issue any guarantees with respect to the program and does not participate in negotiations between suppliers and the financial institution. Duke Energy does not have an economic interest in the supplier’s decision to participate in the program and receives no interest, fees or other benefit from the financial institution based on supplier participation in the program. The following table represents the changes in confirmed obligations outstanding for the three months ended March 31, 2024, and 2023. Three Months Ended March 31, 2023 and 2024 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Confirmed obligations outstanding at December 31, 2022 $ 87 $ 6 $ 19 $ 8 $ 11 $ 5 $ — $ 57 Invoices confirmed during the period 59 10 22 11 11 1 — 25 Confirmed invoices paid during the period (94) (9) (26) (13) (13) (6) — (53) Confirmed obligations outstanding at March 31, 2023 $ 52 $ 7 $ 15 $ 6 $ 9 $ — $ — $ 29 Confirmed obligations outstanding at December 31, 2023 $ 50 $ — $ 3 $ — $ 3 $ — $ — $ 47 Invoices confirmed during the period 57 — 1 — 1 — — 56 Confirmed invoices paid during the period (31) — (2) — (2) — — (29) Confirmed obligations outstanding at March 31, 2024 $ 76 $ — $ 2 $ — $ 2 $ — $ — $ 74 NEW ACCOUNTING STANDARDS No new accounting standards were adopted by the Duke Energy Registrants in 2024.

Dispositions

Dispositions	3 Months Ended
	Mar. 31, 2024
Discontinued Operations and Disposal Groups [Abstract]
Dispositions	DISPOSITIONS Sale of Commercial Renewables Segment In 2023, Duke Energy completed the sale of substantially all the assets in the Commercial Renewables business segment. The disposal process for the remaining assets is expected to be completed around midyear 2024, with net proceeds from the dispositions not anticipated to be material. Assets Held For Sale and Discontinued Operations The Commercial Renewables Disposal Groups were classified as held for sale and as discontinued operations in the fourth quarter of 2022. No interest from corporate level debt was allocated to discontinued operations and no adjustments were made to the historical activity within the Consolidated Statements of Comprehensive Income, Consolidated Statements of Cash Flows or the Consolidated Statements of Changes in Equity. Unless otherwise noted, the notes to these consolidated financial statements exclude amounts related to discontinued operations for all periods presented. The following table presents the carrying values of the major classes of Assets held for sale and Liabilities associated with assets held for sale included in Duke Energy's Consolidated Balance Sheets. (in millions) March 31, 2024 December 31, 2023 Current Assets Held for Sale Other $ 11 $ 14 Total current assets held for sale 11 14 Noncurrent Assets Held for Sale Property, Plant and Equipment Cost 357 247 Accumulated depreciation and amortization (57) (57) Net property, plant and equipment 300 190 Operating lease right-of-use assets, net 4 4 Other 4 3 Total other noncurrent assets held for sale 8 7 Total Assets Held for Sale $ 319 $ 211 Current Liabilities Associated with Assets Held for Sale Accounts payable $ 97 $ 9 Taxes accrued 1 3 Current maturities of long-term debt 44 5 Unrealized losses on commodity hedges 74 68 Other 35 37 Total current liabilities associated with assets held for sale 251 122 Noncurrent Liabilities Associated with Assets Held for Sale Long-Term debt — 39 Operating lease liabilities 5 5 Asset retirement obligations 8 8 Unrealized losses on commodity hedges 102 94 Other 11 11 Total other noncurrent liabilities associated with assets held for sale 126 157 Total Liabilities Associated with Assets Held for Sale $ 377 $ 279 As of March 31, 2024, and December 31, 2023, the noncontrolling interest balance is $66 million. The following table presents the results of the Commercial Renewables Disposal Groups, which are included in Loss from Discontinued Operations, net of tax in Duke Energy's Consolidated Statements of Operations. Three Months Ended March 31, (in millions) 2024 2023 Operating revenues $ (6) $ 80 Operation, maintenance and other 4 89 Property and other taxes — 10 Other income and expenses, net — (4) Interest expense 2 31 (Gain) Loss on disposal (10) 220 Loss before income taxes (2) (274) Income tax expense (benefit) 1 (65) Loss from discontinued operations $ (3) $ (209) Add: Net loss attributable to noncontrolling interest included in discontinued operations — 64 Net loss from discontinued operations attributable to Duke Energy Corporation $ (3) $ (145) The Commercial Renewables Disposal Groups' assets held for sale amounts presented above reflect pretax impairments recorded against property, plant and equipment of approximately $268 million and $278 million as of March 31, 2024, and December 31, 2023, respectively. The carrying amounts for the remaining assets will be updated, if necessary, based on final disposition amounts. Duke Energy has elected not to separately disclose discontinued operations on Duke Energy's Consolidated Statements of Cash Flows. The following table summarizes Duke Energy's cash flows from discontinued operations related to the Commercial Renewables Disposal Groups. Three Months Ended March 31, (in millions) 2024 2023 Cash flows used in: Operating activities $ (3) $ (54) Investing activities — (151) Other Sale-Related Matters Duke Energy (Parent) and several Duke Energy renewables project companies, located in the ERCOT market, were named in several lawsuits arising out of Texas Storm Uri, which occurred in February 2021. The legal actions related to all but one of the project companies in this matter transferred to affiliates of Brookfield in conjunction with the transaction closing in October 2023. See Note 5 for more information. As part of the purchase and sale agreement for the distributed generation group, Duke Energy has agreed to retain certain guarantees, with expiration dates between 2029 through 2034, related to tax equity partners' assets and operations that will be disposed of via sale. Duke Energy has obtained certain guarantees from the buyers in regards to future performance obligations to assist in limiting Duke Energy's exposure under the retained guarantees. The fair value of the guarantees is immaterial as Duke Energy does not believe conditions are likely for performance under these guarantees.

Business Segments

Business Segments	3 Months Ended
	Mar. 31, 2024
Segment Reporting [Abstract]
Business Segments	BUSINESS SEGMENTS Duke Energy Duke Energy's segment structure includes the following two segments: EU&I and GU&I. The EU&I segment primarily includes Duke Energy's regulated electric utilities in the Carolinas, Florida and the Midwest. EU&I also includes Duke Energy's electric transmission infrastructure investments and the offshore wind contract for Carolina Long Bay. The GU&I segment includes Piedmont, Duke Energy's natural gas local distribution companies in Ohio and Kentucky and Duke Energy's natural gas storage, midstream pipeline and renewable natural gas investments. 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 March 31, 2024 Electric Gas Total Utilities and Utilities and Reportable (in millions) Infrastructure Infrastructure Segments Other Eliminations Total Unaffiliated revenues $ 6,785 $ 879 $ 7,664 $ 7 $ — $ 7,671 Intersegment revenues 18 23 41 31 (72) — Total revenues $ 6,803 $ 902 $ 7,705 $ 38 $ (72) $ 7,671 Segment income (loss) $ 1,021 $ 284 $ 1,305 $ (203) $ — $ 1,102 Less: Noncontrolling interests (13) Add: Preferred stock dividend 39 Discontinued operations (3) Net Income $ 1,151 Segment assets (a) $ 156,606 $ 17,464 $ 174,070 $ 4,600 $ — $ 178,670 Three Months Ended March 31, 2023 Electric Gas Total Utilities and Utilities and Reportable (in millions) Infrastructure Infrastructure Segments Other Eliminations Total Unaffiliated revenues $ 6,381 $ 888 $ 7,269 $ 7 $ — $ 7,276 Intersegment revenues 17 23 40 24 (64) — Total revenues $ 6,398 $ 911 $ 7,309 $ 31 $ (64) $ 7,276 Segment income (loss) $ 791 $ 287 $ 1,078 $ (168) $ — $ 910 Less: Noncontrolling interests 43 Add: Preferred stock dividend 39 Discontinued operations (145) Net Income $ 761 (a) Other includes Assets Held for Sale balances related to the Commercial Renewables Disposal Groups. Refer to Note 2 for further information. Duke Energy Ohio Duke Energy Ohio has two reportable segments, EU&I and GU&I. The remainder of Duke Energy Ohio's operations is presented as Other. Three Months Ended March 31, 2024 Electric Gas Total Utilities and Utilities and Reportable (in millions) Infrastructure Infrastructure Segments Other Eliminations Total Total revenues $ 458 $ 220 $ 678 $ — $ — $ 678 Segment income (loss)/Net income $ 55 $ 41 $ 96 $ (2) $ — $ 94 Segment assets $ 7,935 $ 4,350 $ 12,285 $ 13 $ 7 $ 12,305 Three Months Ended March 31, 2023 Electric Gas Total Utilities and Utilities and Reportable (in millions) Infrastructure Infrastructure Segments Other Total Total revenues $ 474 $ 235 $ 709 $ — $ 709 Segment income (loss)/Net income $ 49 $ 52 $ 101 $ (1) $ 100

Regulatory Matters

Regulatory Matters	3 Months Ended
	Mar. 31, 2024
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. For open regulatory matters, unless otherwise noted, the Subsidiary Registrants and Duke Energy Kentucky cannot predict the outcome or ultimate resolution of their respective matters. Duke Energy Carolinas and Duke Energy Progress Nuclear Statio n Subsequent License Renewal On June 7, 2021, Duke Energy Carolinas filed a subsequent license renewal (SLR) application for the Oconee Nuclear Station (ONS) with the U.S. Nuclear Regulatory Commission (NRC) to renew ONS’s operating license for an additional 20 years. The SLR would extend operations of the facility from 60 to 80 years. The current licenses for units 1 and 2 expire in 2033 and the license for unit 3 expires in 2034. By a Federal Register Notice dated July 28, 2021, the NRC provided a 60-day comment period for persons whose interest may be affected by the issuance of a subsequent renewed license for ONS to file a request for a hearing and a petition for leave to intervene. On September 27, 2021, Beyond Nuclear and Sierra Club (Petitioners) filed a Hearing Request and Petition to Intervene (Hearing Request) and a Petition for Waiver. The Hearing Request proposed three contentions and claimed that Duke Energy Carolinas did not satisfy the National Environmental Policy Act (NEPA) of 1969, as amended, or the NRC’s NEPA-implementing regulations. Following Duke Energy Carolinas' answer and the Petitioners' reply, on February 11, 2022, the Atomic Safety and Licensing Board (ASLB) issued its decision on the Hearing Request and found that the Petitioners failed to establish that the proposed contentions are litigable. The ASLB also denied the Petitioners' Petition for Waiver and terminated the proceeding. On February 24, 2022, the NRC issued a decision in the SLR appeal related to Florida Power and Light's Turkey Point nuclear generating station in Florida. The NRC ruled that the NRC’s license renewal Generic Environmental Impact Statement (GEIS) does not apply to SLR because the GEIS does not address SLR. The decision overturned a 2020 NRC decision that found the GEIS applies to SLR. Although Turkey Point is not owned or operated by a Duke Energy Registrant, the NRC’s order applies to all SLR applicants, including ONS. The NRC order also indicated no subsequent renewed licenses will be issued until the NRC staff has completed an adequate NEPA review for each application. On April 5, 2022, the NRC approved a 24-month rulemaking plan that will enable the NRC staff to complete an adequate NEPA review. Although an SLR applicant may wait until the rulemaking is completed, the NRC also noted that an applicant may submit a supplement to its environmental report providing information on environmental impacts during the SLR period prior to the rulemaking being completed. On November 7, 2022, Duke Energy Carolinas submitted a supplement to its environmental report addressing environmental impacts during the SLR period. On September 14, 2023, the NRC posted on its website that the issuance of the GEIS will now be issued in August 2024 instead of May 2024 due to the volume and technical complexity of the comments received. On March 6, 2024, the NRC staff submitted the rulemaking, which included the updated GEIS, to the NRC. On December 19, 2022, the NRC published a notice in the Federal Register that the NRC will conduct a limited scoping process to gather additional information necessary to prepare an environmental impact statement (EIS) to evaluate the environmental impacts at ONS during the SLR period. The NRC received comments from the EPA and the Petitioners and these comments identify 18 potential impacts that should be considered by the NRC in the EIS, which include, but are not limited to, climate change and flooding, environmental justice, severe accidents, and external events. On February 8, 2024, the NRC issued the Oconee site-specific draft EIS. The NRC and EPA published the notice for the public to submit comments on the ONS site-specific draft EIS. On April 29, 2024, the petitioners filed a hearing request. The request proposed three contentions and claimed that the ONS site-specific draft EIS is inadequate to satisfy the requirements of NEPA and the NRC’s NEPA-implementing regulations. Duke Energy Carolinas' deadline to respond to any such requests was extended to May 31, 2024. On December 19, 2022, the NRC issued the Safety Evaluation Report (SER) for the safety portion of the SLR application. The NRC determined Duke Energy Carolinas met the requirements of the applicable regulations and identified actions that have been taken or will be taken to manage the effects of aging and address time-limited analyses. Duke Energy Carolinas and the NRC met with the Advisory Committee on Reactor Safeguards (ACRS) on February 2, 2023, to discuss issues regarding the SER and SLR application. On February 25, 2023, the ACRS issued a report to the NRC on the safety aspects of the ONS SLR application, which concluded that the established programs and commitments made by Duke Energy Carolinas to manage age-related degradation provide confidence that ONS can be operated in accordance with its current licensing basis for the subsequent period of extended operation without undue risk to the health and safety of the public and the SLR application for ONS should be approved. Although the NRC’s GEIS applicability decision has delayed completion of the SLR proceeding, Duke Energy Carolinas does not believe it changes the probability that the ONS subsequent renewed licenses will ultimately be issued, although Duke Energy Carolinas cannot guarantee the outcome of the license application process. Duke Energy Carolinas and Duke Energy Progress intend to seek renewal of operating licenses and 20-year license extensions for all of their nuclear stations. Accordingly, new depreciation rates were implemented for all of the nuclear facilities during the second quarter of 2021. Duke Energy Carolinas 2023 North Carolina Rate Case On January 19, 2023, Duke Energy Carolinas filed a PBR application with the NCUC to request an increase in base rate retail revenues. The PBR Application included a Multiyear rate plan (MYRP) to recover projected capital investments during the three-year MYRP period. In addition to the MYRP, the PBR Application included an Earnings Sharing Mechanism, Residential Decoupling Mechanism and Performance Incentive Mechanisms (PIMS) as required by HB 951. The application as originally filed requested an overall retail revenue increase of $501 million in Year 1, $172 million in Year 2 and $150 million in Year 3, for a combined total of $823 million, or 15.7%, by early 2026. T he rate increase is driven primarily by transmission and distribution investments since the last rate case and projected in the MYRP, as well as investments in energy storage and solar assets included in the MYRP consistent with the Carolinas Carbon Plan (Carbon Plan). On August 22, 2023, Duke Energy Carolinas filed with the NCUC a partial settlement with the Public Staff in connection with its PBR application. The partial settlement included, among other things, a greement on a substantial portion of the North Carolina retail rate base for the historic base case of approximately $19.5 billion and all of the capital projects and related costs to be included in the three-year MYRP, including $4.6 billion (North Carolina retail allocation) projected to go in service over the MYRP period. Additionally, the partial settlement included agreement, with certain adjustments, on depreciation rates, the recovery of grid improvement plan costs and PIMs, Tracking Metrics and the Residential Decoupling Mechanism under t he PBR application. On August 28, 2023, Duke Energy Carolinas filed with the NCUC a second partial settlement with the Public Staff resolving additional issues, including the future treatment of nuclear production tax credits related to the Inflation Reduction Act, through a stand-alone rider that will provide the benefits to customers beginning January 1, 2025. On December 1 5, 2023, the NCUC issued an order approving Duke Energy Carolinas' PBR Application, as modified by the partial settlements and the order, including an overall retail revenue increase of $436 million in Year 1, $174 million in Year 2 and $158 million in Year 3, for a combined total of $768 million. T he order established an ROE of 10.1% based upon an equity ratio of 53% and approved, with certain adjustments, depreciation rates and the recovery of grid improvement plan costs and certain deferred COV ID-related costs. Additionally, the Residential Decoupling Mechanism and PIMs were approved as requested under the PBR Application and revised by the partial settlements. Duke Energy Carolinas implemented interim rates, subject to refund, on September 1, 2023. New revised Year 1 rates and the residential decoupling were implemented on January 15, 2024. On February 13, 2024, a number of parties filed Notices of Appeal of the December 15, 2023, NCUC order. Notices of Appeal were filed by the Carolina Industrial Group for Fair Utility Rates (CIGFUR) III, a collection of various electric membership corporations (collectively, the EMCs), and the North Carolina Attorney General’s Office (the AGO). CIGFUR III and the EMCs appealed the interclass subsidy reduction percentage and the Transmission Cost Allocation stipulation. In addition, CIGFUR III appealed the NCUC’s elimination of the equal percentage fuel cost allocation methodology. The AGO appealed several issues including the authorized ROE and certain rate design and accounting matters . On March 1, 2024, Carolina Utility Customers Association, Inc. appealed several issues, including the authorized ROE and certain rate design and accounting matters. 2024 South Carolina Rate Case On January 4, 2024, Duke Energy Carolinas filed a rate case with the PSCSC to request a net increase in annual retail revenues of 11.4%, or approximately $239 million, in the first two years, and an additional overall increase of about 4.1%, or approximately $84 million additional revenue, after the first two years. The requested increases, if approved, would result in an overall average 15.5% increase in annual retail revenues, or approximately $323 million, prior to mitigation efforts. Duke Energy Carolinas requested an ROE of 10.5% with an equity ratio of 53%. To mitigate the rate increase, Duke Energy Carolinas has proposed to accelerate the return of remaining federal unprotected EDIT balances to customers over two years. This offset reduces the impact to customers in the first two years to the effective net increase of 11.4% after which the credit for EDIT balances expire. Duke Energy Carolinas has requested the revised rates to be effective no later than August 1, 2024. Intervenor testimony and Duke Energy Carolinas' rebuttal testimony were filed in April 2024. The evidentiary hearing is scheduled to commence on May 20, 2024. Marshall Combustion Turbines CPCN On March 14, 2024, Duke Energy Carolinas filed with the NCUC an application to construct and operate two hydrogen-capable advanced-class simple-cycle combustion turbines (CTs) at the site of the existing Marshall Steam Station. The two new CTs – totaling approximately 850 MW – will enable the retirement of Marshall coal units 1 and 2 and provide incremental capacity to support system capacity needs and expanded flexibility to support integration of renewables. Pending regulatory approvals, construction is planned to start in 2026, and the CTs are targeted to be placed into service by the end of 2028. As part of the application, Duke Energy Carolinas noted that Construction Work in Progress for the proposed facility will accrue AFUDC and will not be in rate base, resulting in no impact on Duke Energy Carolinas' North Carolina retail revenue requirement during the construction period. The 2029 North Carolina retail revenue requirement for the proposed facility is estimated to be $104 million, representing an approximate average retail rate increase of 2.2% across all classes. Duke Energy Progress 2022 North Carolina Rate Case On October 6, 2022, Duke Energy Progress filed a PBR application with the NCUC to request an increase in base rate retail revenues. The rate request before the NCUC included an MYRP to recover projected capital investments during the three-year MYRP period. In addition to the MYRP, the PBR Application included an Earnings Sharing Mechanism, Residential Decoupling Mechanism and PIMs as required by HB 951. The overall retail revenue increase as originally filed would have been $326 million in Year 1, $151 million in Year 2 and $138 million in Year 3, for a combined total of $615 million, by late 2025. The rate increase is driven primarily by transmission and distribution investments since the last rate case and projected in the MYRP, as well as investments in energy storage and solar assets included in the MYRP consistent with the Carbon Plan. On April 26, 2023, Duke Energy Progress filed with the NCUC a partial settlement with Public Staff, which included agreement on many aspects of Duke Energy Progress' three-year MYRP proposal. In May 2023, CIGFUR II joined this partial settlement and Public Staff and CIGFUR II filed a separate settlement reaching agreement on PIMs, Tracking Metrics and the Residential Decoupling Mechanism under t he PBR application. On August 18, 2023, the NCUC issued an order approving Duke Energy Progress' PBR Application, as modified by the partial settlements and the order, including an overall retail revenue increase of $233 million in Year 1, $126 million in Year 2 and $135 million in Year 3, for a combined total of $494 million. Key aspects of the order include the approval of North Carolina retail rate base for the historic base case of approximately $12.2 billion and capital projects and related costs to be included in the three-year MYRP, including $3.5 billion (North Carolina retail allocation) projected to go in service over the MYRP period. The order established an ROE of 9.8% based upon an equity ratio of 53% and approved, with certain adjustments, depreciation rates and the recovery of grid improvement plan costs and certain deferred COV ID-related costs. Additionally, the Residential Decoupling Mechanism and PIMs were approved as requested under the PBR Application and revised by the partial settlements. Duke Energy Progress implemented interim rates, subject to refund, on June 1, 2023, and implemented revised Year 1 rates and the residential decoupling on October 1, 2023. On October 17, 2023, CIGFUR II and Haywood Electric Membership Corporation each filed a Notice of Appeal of the August 18, 2023 NCUC order. Both parties are appealing certain matters that do not impact the overall revenue requirement in the rate case. Specifically, they appealed the interclass subsidy reduction percentage, and CIGFUR II also appealed the Customer Assistance Program and the equal percentage fuel cost allocation methodology. On November 6, 2023, the AGO filed a Notice of Cross Appeal of the NCUC's determination regarding the exclusion of electric vehicle revenue from the residential decoupling mechanism. On November 9, 2023, Du ke Energy Progress, the Public Staff, CIGFUR II, and a number of other parties reached a settlement pursuant to which CIGFUR II agreed not to pursue its appeal of the Customer Assistance Program. 2023 South Carolina Storm Securitization On May 31, 2023, Duke Energy Progress filed a petition with the PSCSC requesting authorization for the financing of Duke Energy Progress' storm recovery costs through securitization due to storm recovery activities required as a result of the following storms: Pax, Ulysses, Matthew, Florence, Michael, Dorian, Izzy and Jasper. On September 8, 2023, Duke Energy Progress filed a comprehensive settlement agreement with all parties on all cost recovery issues raised in the storm securitization proceeding. The evidentiary hearing occurred in early September 2023. On September 20, 2023, the PSCSC approved the comprehensive settlement agreement and on October 13, 2023, the PSCSC issued its financing order. The storm recovery bonds of $177 million were issued by Duke Energy Progress on April 25, 202 4. Duke Energy Progress implemented storm recovery charges effective May 1, 2024. See notes 6 and 12 for more information. Person County Combined Cycle CPCN On March 28, 2024, Duke Energy Progress filed with the NCUC its application to construct and operate a 1,360 MW hydrogen-capable, advanced-class combined-cycle generating facility (CC) in Person County at the site of the existing Roxboro Plant. Subject to negotiation of final contractual terms, the new Roxboro CC will be co-owned with the North Carolina Electric Membership Corporation (NCEMC), with Duke Energy Progress owning approximately 1,135 MW and NCEMC owning the remaining 225 MW. Pending regulatory approvals, construction is planned to start in 2026, with the CC targeted to be placed in service by the end of 2028. The CC will allow for the retirement of Roxboro’s coal-fired units 1 and 4. As part of the application, Duke Energy Progress noted that the recovery of Construction Work in Progress during the construction period for the proposed facility may be pursued in a future rate case. The 2029 North Carolina retail revenue requirement for the proposed facility is estimated to be $98 million, representing an approximate average retail rate increase of 2.6% across all classes. Duke Energy Florida 2021 Settlement Agreement On January 14, 2021, Duke Energy Florida filed a Settlement Agreement (the “2021 Settlement”) with the FPSC. The parties to the 2021 Settlement include Duke Energy Florida, the Office of Public Counsel (OPC), the Florida Industrial Power Users Group, White Springs Agricultural Chemicals, Inc. d/b/a PCS Phosphate and NUCOR Steel Florida, Inc. (collectively, the “Parties”). Pursuant to the 2021 Settlement, the Parties agreed to a base rate stay-out provision that expires year-end 2024; however, Duke Energy Florida is allowed an increase to its base rates of an incremental $67 million in 2022, $49 million in 2023 and $79 million in 2024, subject to adjustment in the event of tax reform during the years 2021, 2022 and 2023. The Parties also agreed to an ROE band of 8.85% to 10.85% with a midpoint of 9.85% based upon an equity ratio of 53%. The ROE band can be increased by 25 basis points if the average 30-year U.S. Treasury rate increases 50 basis points or more over a six-month period in which case the midpoint ROE would rise from 9.85% to 10.10%. On July 25, 2022, this provision was triggered. Duke Energy Florida filed a petition with the FPSC on August 12, 2022, to increase the ROE effective August 2022 with a base rate increase effective January 1, 2023. The FPSC approved this request on October 4, 2022. The 2021 Settlement Agreement also provided that Duke Energy Florida will be able to retain $173 million of the expected Department of Energy (DOE) award from its lawsuit to recover spent nuclear fuel to mitigate customer rates over the term of the 2021 Settlement. In return, Duke Energy Florida is permitted to recognize the $173 million into earnings through the approved settlement period. Duke Energy Florida settled the DOE lawsuit and received payment of approximately $180 million on June 15, 2022, of which the retail portion was approximately $154 million. The 2021 Settlement authorizes Duke Energy Florida to collect the difference between $173 million and the $154 million retail portion of the amount received through the capacity cost recovery clause. As of March 31, 2024, Duke Energy Florida has recognized $149 million into earnings, including $8 million and $54 million recognized during the three months ended March 31, 2024, and 2023, respectively. The remaining $24 million is expected to be recognized in 2024. The 2021 Settlement also contained a provision to recover or flow back the effects of tax law changes. As a result of the IRA enacted on August 16, 2022, Duke Energy Florida is eligible for PTCs associated with solar facilities placed in service beginning in January 2022. Duke Energy Florida filed a petition with the FPSC on October 17, 2022, to reduce base rates effective January 1, 2023, by $56 million to flow back the expected 2023 PTCs and to flow back the expected 2022 PTCs via an adjustment to the capacity cost recovery clause. On December 14, 2022, the FPSC issued an order approving Duke Energy Florida's petition. In addition to these terms, the 2021 Settlement contained provisions related to the accelerated depreciation of Crystal River Units 4-5, the approval of approximately $1 billion in future investments in new cost-effective solar power, the implementation of a new Electric Vehicle Charging Station Program and the deferral and recovery of costs in connection with the implementation of Duke Energy Florida’s Vision Florida program, which explores various emerging non-carbon emitting generation technology, distributed technologies and resiliency projects, among other things. The 2021 Settlement also resolved remaining unrecovered storm costs for Hurricane Michael and Hurricane Dorian. The FPSC approved the 2021 Settlement on May 4, 2021, issuing an order on June 4, 2021. Revised customer rates became effective January 1, 2022, with subsequent base rate increases effective January 1, 2023, and January 1, 2024. Clean Energy Connection On July 1, 2020, Duke Energy Florida petitioned the FPSC for approval of a voluntary solar program consisting of 10 new solar generating facilities with combined capacity of approximately 750 MW. The program allows participants to support cost-effective solar development in Florida by paying a subscription fee based on per kilowatt subscriptions and receiving a credit on their bill based on the actual generation associated with their portion of the solar portfolio. The estimated cost of the 10 new solar generation facilities is approximately $1 billion and the projects are expected to be completed by the end of 2024. This investment is included in base rates offset by the revenue from the subscription fees and the credits will be included for recovery in the fuel cost recovery clause. The FPSC approved the program in January 2021. On February 24, 2021, the League of United Latin American Citizens (LULAC) filed a notice of appeal of the FPSC’s order approving the Clean Energy Connection to the Supreme Court of Florida. The Supreme Court of Florida heard oral arguments in the appeal on February 9, 2022. On May 27, 2022, the Supreme Court of Florida issued an order remanding the case back to the FPSC so that the FPSC can amend its order to better address some of the arguments raised by LULAC. On September 23, 2022, the FPSC issued a revised order and submitted it on September 26, 2022, to the Supreme Court of Florida. The Supreme Court of Florida requested that the parties file supplemental briefs regarding the revised order, which were filed February 6, 2023. LULAC has filed a request for Oral Argument on the issues discussed in the supplemental briefs, but the court has yet to rule on that request. The FPSC approval order remains in effect pending the outcome of the appeal. Storm Protection Plan On April 11, 2022, Duke Energy Florida filed a Storm Protection Plan for approval with the FPSC. The plan, which covers investments for the 2023-2032 time frame, reflects approxim ately $7 billion of capital inv estment in transmission and distribution meant to strengthen its infrastructure, reduce outage times associated with extreme weather events, reduce restoration costs and improve ove rall service reliability. The evidentiary hearing began on August 2, 2022. On October 4, 2022, the FPSC voted to approve Duke Energy Florida’s plan with one modification to remove the transmission loop radially fed program, representing a reduction of approximately $80 million over the 10-year period starting in 2025. On December 9, 2022, the OPC filed a notice of appeal of this order to the Florida Supreme Court. The OPC's initial brief was filed on April 18, 2023. Duke Energy Florida filed its answer brief on July 17, 2023. The OPC's reply brief was filed on October 16, 2023. The Florida Supreme Court heard oral arguments on February 7, 2024. Hurricanes Ian and Idalia On September 28, 2022, much of Duke Energy Florida’s service territory was impacted by Hurricane Ian, which caused significant damage resulting in more than 1.1 million outages. After depleting any existing storm reserves, which were approximately $107 million before Hurricane Ian, Duke Energy Florida is permitted to petition the FPSC for recovery of additional incremental operation and maintenance costs resulting from the storm and to replenish the retail customer storm reserve to approximately $132 million. Duke Energy Florida filed its petition for cost recovery of various storms, including Hurricane Ian, and replenishment of the storm reserve on January 23, 2023, seeking recovery of $442 million, for recovery over 12 months beginning with the first billing cycle in April 2023. On March 7, 2023, the FPSC approved this request for interim recovery, subject to refund, and ordered Duke Energy Florida to file documentation of the total actual storm costs, once known. Duke Energy Florida filed documentation evidencing its total actual storm costs of $431 million on September 29, 2023. The FPSC will hold a final hearing to determine the prudence of these costs on May 21 and 22, 2024. On August 30, 2023, Hurricane Idalia made landfall on Florida’s gulf coast, causing damage and impacting more than 200,000 customers across Duke Energy Florida's service territory. On October 16, 2023, Duke Energy Florida requested to combine the $92 million retail portion of the deferred estimated Hurricane Idalia costs with $74 million of costs projected to be collected after December 31, 2023, under the existing approved storm cost recovery and storm surcharge. This $74 million of costs relates primarily to the approved ongoing replenishment of the storm reserves. At its December 5, 2023 Agenda Conference, the FPSC approved recovery of the total $166 million over 12 months beginning with its first billing cycle in January 2024, replacing the previously approved storm cost recovery and storm surcharge, and ordered Duke Energy Florida to file documentation of the total actual Idalia related storm costs, once known. Revised rates were effective January 1, 2024. 2024 Florida Rate Case On April 2, 2024, Duke Energy Florida filed a formal request for new base rates with the FPSC. Duke Energy Florida has proposed a three-year rate plan that would begin in January 2025, once its current base rate settlement agreement concludes at the end of 2024. Duke Energy Florida proposed multiyear rate increases that use the projected 12-month periods ending December 31, 2025, 2026, and 2027 as the test years, with adjusted rates to be effective with the first billing period of January 2025, 2026, and 2027, respectively. Duke Energy Florida requested additional base rate revenue requirements of approximately $593 million in 2025, $98 million in 2026 and $129 million in 2027, representing an average annual increase in revenue requirements of approximately 4% over 2025 through 2027. Duke Energy Florida requested an ROE midpoint at 11.15% and an equity ratio of 53%. A final hearing on this request is scheduled to begin on August 12, 2024. Duke Energy Ohio Duke Energy Ohio Electric Base Rate Case Duke Energy Ohio filed with the PUCO an electric distribution base rate case application on October 1, 2021, with supporting testimony filed on October 15, 2021, requesting an increase in electric distribution base rates of approximately $55 million. On September 19, 2022, Duke Energy Ohio filed a Stipulation and Recommendation with the PUCO, which includes an increase in overall electric distribution base rates of approximately $23 million with an equity ratio of 50.5% and an ROE of 9.5%. The stipulation is among all but one party to the proceeding. The PUCO issued an order on December 14, 2022, approving the Stipulation without material modification. Rates went into effect on January 3, 2023. The Ohio Consumers' Counsel filed an application for rehearing on January 13, 2023, arguing the Stipulation was unreasonable, discriminatory, and denied OCC due process. On March 20, 2024, the PUCO issued its Second Entry on Rehearing, denying OCC's rehearing application. OCC has 60 days to seek an appeal. Duke Energy Ohio Natural Gas Base Rate Case Duke Energy Ohio filed with the PUCO a natural gas base rate case application on June 30, 2022, with supporting testimony filed on July 14, 2022, requesting an increase in natural gas base rates of approximately $49 million. The drivers for this case are capital invested since Duke Energy Ohio's last natural gas base rate case in 2012. Duke Energy Ohio also sought to adjust the caps on its CEP rider. On April 28, 2023, Duke Energy Ohio filed a stipulation with all parties to the case except the OCC. In the stipulation, the parties agreed to approximately $32 million in revenue increases with an equity ratio of 52.32% and an ROE of 9.6%, and adjustments to the CEP Rider caps. The stipulation was opposed by the OCC at an evidentiary hearing that concluded on May 24, 2023. On November 1, 2023, PUCO issued an order approving the stipulation as filed. New rates went into effect November 1, 2023. On December 1, 2023, the OCC filed an application for rehearing. On December 13, 2023, the PUCO granted OCC's application for rehearing for further consideration of issues raised. Duke Energy Ohio Electric Security Plan On April 1, 2024, Duke Energy Ohio filed with the PUCO a request for an Electric Security Plan (ESP). The ESP application proposes a three-year term from June 1, 2025 through May 31, 2028 and includes continuation of market-based customer rates through competitive procurement processes for generation and continuation and expansion of existing rider mechanisms. Duke Energy Ohio is proposing a new rider mechanism relating to electric distribution infrastructure modernization programs, which may be enabled by and partially funded through federal or state funding opportunities, future battery storage projects, and two proposed electric vehicle programs. Additional proposed new rider mechanisms are related to solar for all investments for low-income and disadvantaged communities, low-income senior citizen bill assistance, and energy efficiency and demand-side management programs. Duke Energy Kentucky Electric Base Rate Case On December 1, 2022, Duke Energy Kentucky filed a rate case with the KPSC requesting an annualized increase in electric base rates of approximately $75 million. The request for rate increase was driven by capital investments to strengthen the electricity generation and delivery systems along with adjusted depreciation rates for the East Bend and Woodsdale Combustion Turbine (CT) generation stations. Duke Energy Kentucky also requested approval for new programs and tariff updates, including a voluntary community-based renewable subscription program and two electric vehicle charging programs. The KPSC issued an order on October 12, 2023, including a $48 million increase in base revenues, an ROE of 9.75% for electric base rates and 9.65% for electric riders and an equity ratio of 52.145%. New rates went into effect October 13, 2023. The Company's request to align the depreciation rates of East Bend with a 2035 retirement date was denied and the KPSC ordered depreciation rates with a 2041 retirement date for the unit. The KPSC did approve the request to align the depreciation rates of Woodsdale CT with a 2040 retirement date and denied the voluntary community-based renewable subscription program and the two electric vehicle charging programs. On November 1, 2023, Duke Energy Kentucky filed for rehearing requesting certain matters be reconsidered by the KPSC. On November 21, 2023, KPSC granted in part and denied in part the Company's request for rehearing. On February 15, 2024, the KPSC issued a briefing schedule for the rehearing process. The briefing concluded on April 1, 2024, and the matter

Commitments and Contingencies

Commitments and Contingencies	3 Months Ended
	Mar. 31, 2024
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 on 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 Other Current Liabilities and Other within Other Noncurrent Liabilities on the Condensed Consolidated Balance Sheets. (in millions) March 31, 2024 December 31, 2023 Reserves for Environmental Remediation Duke Energy $ 86 $ 88 Duke Energy Carolinas 23 23 Progress Energy 19 19 Duke Energy Progress 9 9 Duke Energy Florida 10 10 Duke Energy Ohio 34 36 Duke Energy Indiana 2 2 Piedmont 7 7 Additional losses in excess of recorded reserves that could be incurred for the stages of investigation, remediation and monitoring for environmental sites that have been evaluated at this time are not material. LITIGATION For open litigation, unless otherwise noted, Duke Energy and the Subsidiary Registrants cannot predict the outcome or ultimate resolution of their respective matters. D uke Energy Texas Storm Uri Tort Litigation Duke Energy (Parent), several Duke Energy renewables project companies , and others in the ERCOT market were named in multiple lawsuits arising out of Texas Storm Uri, which occurred in February 2021. These lawsuits seek recovery for property damage, personal injury and wrongful death allegedly caused by the power outages that plaintiffs claim were the collective failure of generators including Duke Energy entities, transmission and distribution operators (TDUs), retail energy providers, and all others, including ERCOT. The cases were consolidated into a Texas state court multidistrict litigation (MDL) proceeding for discovery and pre-trial motions. Five MDL cases were designated as lead cases in which motions to dismiss were filed and all other cases were stayed. On January 28, 2023, the court denied certain motions including those by the generator defendants and TDUs and granted others. The generators and TDUs filed separate petitions for Writ of Mandamus to the Texas Court of Appeals seeking to overturn the denials. The TDUs' petition, filed first, was accepted and oral argument was held on October 23, 2023. In the cases against the generators, plaintiffs have dismissed the claims against Duke Energy (Parent). However, before Duke Energy (Parent) was dismissed from all cases, on December 14, 2023, without argument, the Court of Appeals accepted mandamus of the generator defendants’ ap peal, which includes all Duke Energy entities, and directed the MDL court to dismiss all claims. Plaintiffs filed their Petition for Reconsideration on January 29, 20 24, and the generator defendants responded on May 6, 2024. Regardless of the outcome of any motion for reconsideration or appeal, claims against Duke Energy (Parent) will remain dismissed. In October 2023, in conjunction with the closing of the sale of the utility-scale solar and wind group, all but one of the project company lawsuits transferred to Brookfield. Based on legal proceedings to date and applicable insurance and reinsurance coverage, Duke Energy (Parent) does not anticipate any material financial impacts with this remaining case. See Note 2 for more information related to the sale of the Commercial Renewables Disposal Groups. Duke Energy Carolinas NTE Carolinas II, LLC Litigation In November 2017, Duke Energy Carolinas entered into a standard FERC large generator interconnection agreement (LGIA) with NTE Carolinas II, LLC (NTE), a company that proposed to build a combined-cycle natural gas plant in Rockingham County, North Carolina. On September 6, 2019, Duke Energy Carolinas filed a lawsuit in Mecklenburg County Superior Court against NTE for breach of contract, alleging that NTE's failure to pay benchmark payments for Duke Energy Carolinas' transmission system upgrades required under the interconnection agreement constituted a termination of the interconnection agreement. Duke Energy Carolinas sought 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. Both NTE's and Duke Energy Carolinas' motions to dismiss were subsequently denied by the court. On May 21, 2020, in response to a NTE petition challenging Duke Energy Carolinas' termination of the LGIA, FERC issued a ruling that 1) it has exclusive jurisdiction to determine whether a transmission provider may terminate an LGIA; 2) FERC approval is required to terminate a conforming LGIA if objected to by the interconnection customer; and 3) Duke Energy may not announce the termination of a conforming LGIA unless FERC has approved the termination. FERC's Office of Enforcement also initiated an investigation of Duke Energy Carolinas into matters pertaining to the LGIA. On April 6, 2023, Duke Energy Carolinas received notice from the FERC Office of Enforcement that they have closed their non-public investigation with no further action recommended. Following completion of discovery, Duke Energy Carolinas filed a motion for summary judgment seeking a ruling in its favor as to some of its affirmative claims against NTE and to all of NTE’s counterclaims. On June 24, 2022, the court issued an order partially granting Duke Energy Carolinas' motion by dismissing NTE's counterclaims that Duke Energy Carolinas engaged in anti-competitive behavior in violation of state and federal statutes. On October 12, 2022, the parties executed a settlement agreement with respect to the remaining breach of contract claims in the litigation and a Stipulation of Dismissal was filed with the court on October 13, 2022. On November 11, 2022, NTE filed its Notice of Appeal to the U.S. Court of Appeals for the Fourth Circuit as to the District Court's summary judgment ruling in Duke Energy Carolinas' favor on NTE's antitrust and unfair competition claims. Briefing on NTE's appeal was completed on June 30, 2023. Oral argument is scheduled for May 7, 2024. Asbestos-related Injuries and Damages Claims Duke Energy Carolinas has experienced numerous claims for indemnification and medical cost reimbursement related to asbestos exposure. These claims relate to damages for bodily injuries alleged to have arisen from exposure to or use of asbestos in connection with construction and maintenance activities conducted on its electric generation plants prior to 1985. Duke Energy Caroli nas has recognized asbestos-related reserves of $417 million at March 31, 2024, and $423 million at December 31, 2023. 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 on Duke Energy Carolinas' best estimate for current and future asbestos claims through 2043 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 2043 related to such potential claims. It is possible Duke Energy Carolinas may incur asbestos liabilities in excess of the recorded reserves. Duke Energy Carolinas has third-party insurance to cover certain losses related to asbestos-related injuries and damages above an aggregate self-insured retention. Receivables for insurance recoveries were $572 million at March 31, 2024, a nd December 31, 2023. These amounts are classified in Other within Other Noncurrent Assets and Receivables within Current Assets on the Condensed Consolidated Balance Sheets. Any future payments up to the policy limit will be reimbursed by the third-party insurance carrier. Duke Energy Carolinas is not aware of any uncertainties regarding the legal sufficiency of insurance claims. Duke Energy Carolinas believes the insurance recovery asset is probable of recovery as the insurance carrier continues to have a strong financial strength rating. The reserve for credit losses for insurance receivables is $9 million as of March 31, 2024 , and December 31, 2023, for both Duke Energy and Duke Energy Carolinas. The insurance receivable is evaluated based on the risk of default and the historical losses, current conditions and expected conditions around collectability. Management evaluates the risk of default annually based on payment history, credit rating and changes in the risk of default from credit agencies. Duke Energy Indiana Coal Ash Insurance Coverage Litigation In June 2022, Duke Energy Indiana filed a civil action in Indiana Superior Court against various insurance companies seeking declaratory relief with respect to insurance coverage for coal combustion residuals-related expenses and liabilities covered by third-party liability insurance policies. The insurance policies cover the 1969-1972 and 1984-1985 periods and provide third-party liability insurance for claims and suits alleging property damage, bodily injury and personal injury (or a combination thereof). A trial date has not yet been set. On June 30, 2023, Duke Energy Indiana and Associated Electric and Gas Insurance Services (AEGIS) reached a confidential settlement, the results of which were not material to Duke Energy, and as a result, AEGIS was dismissed from the litiga tio n on July 13, 2023. On December 11, 2023, Duke Energy Indiana and Munich Reinsurance America, Inc. (formerly known as American Re-Insurance Company) (AmRe) reached a confidential settlement, the results of which were not material, and AmRe was dismissed from the litigation on January 18, 2024. The lawsuit remains pending as to the other insurers but is stayed until June 14, 2024, to allow for further settlement negotiations with other defendants. 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. Reserves are classified on the Condensed Consolidated Balance Sheets in Other within Other Noncurrent Liabilities and Other within Current Liabilities. OTHER COMMITMENTS AND CONTINGENCIES General As part of their normal business, the Duke Energy Registrants are party to various financial guarantees, performance guarantees and other contractual commitments to extend guarantees of credit and other assistance to various subsidiaries, investees and other third parties. These guarantees involve elements of performance and credit risk, which are not fully recognized on the 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.

Debt and Credit Facilities

Debt and Credit Facilities	3 Months Ended
	Mar. 31, 2024
Debt Disclosure [Abstract]
Debt and Credit Facilities	DEBT AND CREDIT FACILITIES In April 2024, Duke Energy issued 750 million euros aggregate principal amount of 3.75% senior notes due April 2031. Duke Energy's obligations under its euro-denominated fixed-rate notes were effectively converted to fixed-rate U.S. dollars at issuance through cross-currency swaps, mitigating foreign currency exchange risk associated with the interest and principal payments. The $815 million equivalent in U.S. dollars were used to repay a portion of a $1 billion debt maturity due April 2024, pay down short-term debt and for general corporate purposes. See Note 9 for additional information. In April 2024, Duke Energy Florida issued $173 million of First Mortgage Bonds due April 2074, with an interest rate of SOFR minus 35 basis points. Proceeds were used to pay down a portion of the DEFR accounts receivable securitization facility maturing in April 2024, and for general company purposes. The terms of the indenture could require repayment in less than 12 months if exercised by the bondholders and, as such, these first mortgage bonds will be classified as Current maturities of long-term debt on the Condensed Consolidated Balance Sheets. In April 2024, Duke Energy Progress issued $177 million of storm recovery bonds at an interest rate of 5.404%. Proceeds were used to finance the South Carolina portion of restoration expenditures related to the following storms: Pax, Ulysses, Matthew, Florence, Michael, Dorian, Izzy and Jasper. See notes 4 and 12 for more information. SUMMARY OF SIGNIFICANT DEBT ISSUANCES The following table summarizes significant debt issuances (in millions). Three Months Ended March 31, 2024 Duke Duke Duke Duke Duke Maturity Interest Duke Energy Energy Energy Energy Energy Issuance Date Date Rate Energy (Parent) Carolinas Progress Ohio Indiana Unsecured Debt January 2024 (a) January 2027 4.85 % $ 600 $ 600 $ — $ — $ — $ — January 2024 (a) January 2029 4.85 % 650 650 — — — — First Mortgage Bonds January 2024 (b) January 2034 4.85 % $ 575 $ — $ 575 $ — $ — $ — January 2024 (b) January 2054 5.40 % 425 — 425 — — — March 2024 (b) March 2034 5.25 % 300 — — — — 300 March 2024 (c) March 2034 5.10 % 500 — — 500 — — March 2024 (d) March 2054 5.55 % 425 — — — 425 — Total issuances $ 3,475 $ 1,250 $ 1,000 $ 500 $ 425 $ 300 (a) Proceeds were used to repay the remaining $1 billion outstanding on Duke Energy (Parent)'s variable rate Term Loan Facility due March 2024, pay down a portion of short-term debt and for general corporate purposes. Duke Energy (Parent)'s Term Loan Facility was terminated in March 2024 in conjunction with the payoff of remaining borrowings. (b) Proceeds were used to pay down a portion of short-term debt and for general company purposes. (c) Proceeds were used to fund eligible green energy projects, pay down a portion of short-term debt and for general company purposes. (d) Proceeds were used to pay down a portion of short-term debt 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 March 31, 2024 Unsecured Debt Duke Energy (Parent) April 2024 3.750 % $ 1,000 Secured Debt Duke Energy Florida (a) April 2024 6.395 % 163 Duke Energy Florida (a) April 2024 6.226 % 162 Duke Energy Carolinas (a) January 2025 6.176 % 500 First Mortgage Bonds Duke Energy Florida (b) October 2073 4.922 % 200 Other (c) 249 Current maturities of long-term debt $ 2,274 (a) Debt has a floating interest rate. In April 2024, Duke Energy Florida repaid the $325 million in total borrowings outstanding under the DEFR accounts receivable securitization facility maturing in April 2024 and terminated the facility. See Note 12 for additional information. (b) While final maturity is October 2073, these first mortgage bonds are classified as Current maturities of long-term debt on the Consolidated Balance Sheets, based on terms of the indenture, which could require repayment in less than 12 months if exercised by the bondholders. (c) Includes finance lease obligations, amortizing debt, tax-exempt bonds with mandatory put options and small bullet maturities. AVAILABLE CREDIT FACILITIES Master Credit Facility In March 2024, Duke Energy extended the termination date of its existing $9 billion Master Credit Facility to March 2029. 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. An amendment in conjunction with the issuance of the Convertible Senior Notes due April 2026 clarifies that payments due as a result of a conversion of a convertible note would not constitute an event of default. The table below includes the current borrowing sublimits and available capacity under these credit facilities. March 31, 2024 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) $ 9,000 $ 2,275 $ 1,400 $ 1,575 $ 950 $ 1,050 $ 950 $ 800 Reduction to backstop issuances Commercial paper (b) (3,759) (1,309) (355) (904) (66) (331) (286) (508) Outstanding letters of credit (38) (26) (4) (1) (7) — — — Tax-exempt bonds (81) — — — — — (81) — Available capacity under the Master Credit Facility $ 5,122 $ 940 $ 1,041 $ 670 $ 877 $ 719 $ 583 $ 292 (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. Duke Energy Term Loan Facility On March 26, 2024, Duke Energy (Parent) entered into a 364-day term loan facility with commitments totaling $700 million. Any undrawn commitments could be drawn up until April 25, 2024 (30 days after the effective date of the agreement) or are otherwise ineligible to be drawn. On April 24, 2024, $500 million was drawn under the facility with borrowings used for general corporate purposes. Borrowings can be prepaid at any time throughout the term of the facility. The terms and conditions of the facility are generally consistent with those governing Duke Energy's Master Credit Facility.

Goodwill

Goodwill	3 Months Ended
	Mar. 31, 2024
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill	GOODWILL Duke Energy Duke Energy's Goodwill balance of $19.3 billion is allocated $17.4 billion to EU&I and $1.9 billion to GU&I on Duke Energy's Condensed Consolidated Balance Sheets at March 31, 2024, and December 31, 2023. There are no accumulated impairment charges. Duke Energy Ohio Duke Energy Ohio's Goodwill balance of $920 million, allocated $596 million to EU&I and $324 million to GU&I, is presented net of accumulated impairment charges of $216 million on the Condensed Consolidated Balance Sheets at March 31, 2024, and December 31, 2023. Progress Energy Progress Energy's Goodwill is included in the EU&I segment and there are no accumulated impairment charges. Piedmont Piedmont's Goodwill is included in the GU&I segment and there are no accumulated impairment charges.

Related Party Transactions

Related Party Transactions	3 Months Ended
	Mar. 31, 2024
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. Transactions with related parties included on the Condensed Consolidated Statements of Operations and Comprehensive Income are presented in the following table. Three Months Ended March 31, (in millions) 2024 2023 Duke Energy Carolinas Corporate governance and shared service expenses (a) $ 214 $ 196 Indemnification coverages (b) 11 9 JDA revenue (c) 16 13 JDA expense (c) 40 29 Intercompany natural gas purchases (d) 4 5 Progress Energy Corporate governance and shared service expenses (a) $ 188 $ 178 Indemnification coverages (b) 14 12 JDA revenue (c) 40 29 JDA expense (c) 16 13 Intercompany natural gas purchases (d) 19 19 Duke Energy Progress Corporate governance and shared service expenses (a) $ 114 $ 107 Indemnification coverages (b) 6 5 JDA revenue (c) 40 29 JDA expense (c) 16 13 Intercompany natural gas purchases (d) 19 19 Duke Energy Florida Corporate governance and shared service expenses (a) $ 74 $ 71 Indemnification coverages (b) 8 7 Duke Energy Ohio Corporate governance and shared service expenses (a) $ 77 $ 73 Indemnification coverages (b) 2 1 Duke Energy Indiana Corporate governance and shared service expenses (a) $ 102 $ 99 Indemnification coverages (b) 2 2 Piedmont Corporate governance and shared service expenses (a) $ 41 $ 38 Indemnification coverages (b) 1 1 Intercompany natural gas sales (d) 23 24 Natural gas storage and transportation costs (e) 6 6 (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 and Impairment of assets and other charges 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 were previously 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 were largely cash but included a subordinated note from CRC for a portion of the purchase price. In March 2024, Duke Energy repaid all outstanding CRC borrowings and terminated the related CRC credit facility. 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 March 31, 2024 Intercompany income tax receivable $ — $ — $ — $ — $ — $ 9 $ — Intercompany income tax payable 39 30 69 31 15 — 76 December 31, 2023 Intercompany income tax receivable $ — $ — $ — $ — $ 91 $ 53 $ — Intercompany income tax payable 81 92 94 114 — — 57

Derivatives and Hedging

Derivatives and Hedging	3 Months Ended
	Mar. 31, 2024
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivatives and Hedging	DERIVATIVES AND HEDGING The Duke Energy Registrants use commodity, interest rate and foreign currency contracts to manage commodity price risk, interest rate risk and foreign currency exchange 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. Foreign currency derivatives are used to manage risk related to foreign currency exchange rates on certain issuances of debt. All derivative instruments not identified as NPNS are recorded at fair value as assets or liabilities o n the Condensed Consolidated Balance Sheets. Cash collateral related to derivative instruments ex ecuted 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 or financing activities on the Condensed Consolidated Statements of Cash Flows consistent with the classification of the hedged transaction. 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 months ended March 31, 2024, and 2023, were not material. Duke Energy's interest rate derivatives designated as hedges include 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 tables show notional amounts of outstanding derivatives related to interest rate risk. March 31, 2024 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Indiana Ohio Cash flow hedges $ 2,550 $ — $ — $ — $ — $ — $ — Undesignated contracts 2,402 850 1,325 875 450 200 27 Total notional amount $ 4,952 $ 850 $ 1,325 $ 875 $ 450 $ 200 $ 27 December 31, 2023 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Indiana Ohio Cash flow hedges $ 2,300 $ — $ — $ — $ — $ — $ — Undesignated contracts 2,727 1,050 1,250 925 325 400 27 Total notional amount $ 5,027 $ 1,050 $ 1,250 $ 925 $ 325 $ 400 $ 27 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. 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. For the Subsidiary Registrants, bulk power electricity and natural gas purchases flow through fuel adjustment clauses, formula-based contracts or other cost-sharing mechanisms. Differences between the costs included in rates and the incurred costs, including undesignated derivative contracts, are largely deferred as regulatory assets or regulatory liabilities. Piedmont policies allow for the use of financial instruments to hedge commodity price risks. The strategy and objective of these hedging programs are to use the financial instruments to reduce natural gas cost volatility for customers. Volumes The tables below include volumes of outstanding commodity derivatives. Amounts disclosed represent the absolute value of notional volumes of commodity contracts excluding NPNS. The Duke Energy Registrants have netted contractual amounts where offsetting purchase and sale contracts exist with identical delivery locations and times of delivery. Where all commodity positions are perfectly offset, no quantities are shown. March 31, 2024 Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy Carolinas Energy Progress Ohio Indiana Piedmont Electricity (GWh) 4,981 — — — 669 4,312 — Natural gas (millions of dekatherms) 813 266 259 259 — 35 253 December 31, 2023 Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy Carolinas Energy Progress Ohio Indiana Piedmont Electricity (GWh) 13,608 — — — 1,616 11,992 — Natural gas (millions of dekatherms) 846 279 274 274 — 30 263 FOREIGN CURRENCY RISK Duke Energy may enter into foreign currency derivatives to hedge exposure to changes in foreign currency exchange rates, such as that arising from the issuance of debt denominated in a currency other than U.S. dollars. Fair Value Hedges Derivatives related to existing fixed-rate securities are accounted for as fair value hedges, where the derivatives’ fair value gains or losses and hedged items’ fair value gains or losses are both recorded directly to earnings on the same income statement line item, including foreign currency gains or losses arising from changes in the U.S. currency exchange rates. Duke Energy has elected to exclude the cross-currency basis spread from the assessment of effectiveness in the fair value hedges of its foreign currency risk and record any difference between the change in the fair value of the excluded components and the amounts recognized in earnings as a component of other comprehensive income or loss. The following table shows Duke Energy's outstanding derivatives related to foreign currency risk at March 31, 2024. Fair Value Gain (Loss) (a) (in millions) Pay Notional Receive Notional Receive Hedge Three Months Ended March 31, (in millions) Pay Rate (in millions) Rate Maturity Date 2024 2023 Fair value hedges $ 645 4.75 % 600 euros 3.10 % June 2028 $ 2 $ 5 537 5.31 % 500 euros 3.85 % June 2034 2 5 Total notional amount $ 1,182 1,100 euros $ 4 $ 10 (a) Amounts are recorded in Other Income and expenses, net on the Condensed Consolidated Statement of Operations, which offsets an equal translation adjustment of the foreign denominated debt. See the Condensed Consolidated Statements of Comprehensive Income for amounts excluded from the assessment of effectiveness for which the difference between changes in fair value and periodic amortization is recorded. In April 2024, Duke Energy issued 750 million euros aggregate principal amount of 3.75% senior notes due 2031. The notes were effectively converted to fixed-rate U.S. dollars at issuance for $815 million at 5.648%. See Note 6 for additional information. LOCATION AND FAIR VALUE OF DERIVATIVE ASSETS AND LIABILITIES RECOGNIZED IN THE CONDENS ED 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 March 31, 2024 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 $ 21 $ 1 $ 11 $ 1 $ 10 $ — $ 7 $ 1 Noncurrent 54 25 29 29 — — — — Total Derivative Assets – Commodity Contracts $ 75 $ 26 $ 40 $ 30 $ 10 $ — $ 7 $ 1 Interest Rate Contracts Designated as Hedging Instruments Current $ 74 $ — $ — $ — $ — $ — $ — $ — Noncurrent 40 — — — — — — — Not Designated as Hedging Instruments Noncurrent 43 9 17 17 — — 17 — Total Derivative Assets – Interest Rate Contracts $ 157 $ 9 $ 17 $ 17 $ — $ — $ 17 $ — Foreign Currency Contracts Designated as Hedging Instruments Noncurrent $ 23 $ — $ — $ — $ — $ — $ — $ — Total Derivative Assets – Foreign Currency Contracts $ 23 $ — $ — $ — $ — $ — $ — $ — Total Derivative Assets $ 255 $ 35 $ 57 $ 47 $ 10 $ — $ 24 $ 1 Derivative Liabilities March 31, 2024 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 $ 335 $ 175 $ 126 $ 126 $ — $ — $ 19 $ 14 Noncurrent 213 53 48 48 — — — 112 Total Derivative Liabilities – Commodity Contracts $ 548 $ 228 $ 174 $ 174 $ — $ — $ 19 $ 126 Interest Rate Contracts Designated as Hedging Instruments Current $ 14 $ — $ — $ — $ — $ — $ — $ — Noncurrent 11 — — — — — — — Not Designated as Hedging Instruments Noncurrent 21 6 14 7 7 1 — — Total Derivative Liabilities – Interest Rate Contracts $ 46 $ 6 $ 14 $ 7 $ 7 $ 1 $ — $ — Foreign Currency Contracts Designated as Hedging Instruments Current $ 18 $ — $ — $ — $ — $ — $ — $ — Total Derivative Liabilities – Foreign Currency Contracts $ 18 $ — $ — $ — $ — $ — $ — $ — Total Derivative Liabilities $ 612 $ 234 $ 188 $ 181 $ 7 $ 1 $ 19 $ 126 Derivative Assets December 31, 2023 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 $ 25 $ 1 $ 3 $ 1 $ 2 $ 1 $ 18 $ 1 Noncurrent 57 26 31 31 — — — — Total Derivative Assets – Commodity Contracts $ 82 $ 27 $ 34 $ 32 $ 2 $ 1 $ 18 $ 1 Interest Rate Contracts Designated as Hedging Instruments Current $ 31 $ — $ — $ — $ — $ — $ — $ — Noncurrent 17 — — — — — — — Not Designated as Hedging Instruments Current $ 5 $ 5 $ — $ — $ — $ — $ — $ — Noncurrent 10 3 — — — — 7 — Total Derivative Assets – Interest Rate Contracts $ 63 $ 8 $ — $ — $ — $ — $ 7 $ — Foreign Currency Contracts Designated as Hedging Instruments Noncurrent $ 44 $ — $ — $ — $ — $ — $ — $ — Total Derivative Assets – Foreign Currency Contracts $ 44 $ — $ — $ — $ — $ — $ — $ — Total Derivative Assets $ 189 $ 35 $ 34 $ 32 $ 2 $ 1 $ 25 $ 1 Derivative Liabilities December 31, 2023 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 $ 354 $ 177 $ 138 $ 138 $ — $ — $ 18 $ 20 Noncurrent 255 67 61 61 — — — 127 Total Derivative Liabilities – Commodity Contracts $ 609 $ 244 $ 199 $ 199 $ — $ — $ 18 $ 147 Interest Rate Contracts Designated as Hedging Instruments Current $ 25 $ — $ — $ — $ — $ — $ — $ — Noncurrent 26 — — — — — — — Not Designated as Hedging Instruments Current $ 13 $ 2 $ 11 $ 11 $ — $ — $ — $ — Noncurrent 39 14 24 9 15 1 — — Total Derivative Liabilities – Interest Rate Contracts $ 103 $ 16 $ 35 $ 20 $ 15 $ 1 $ — $ — Foreign Currency Contracts Designated as Hedging Instruments Current $ 17 $ — $ — $ — $ — $ — $ — $ — Total Derivative Liabilities – Foreign Currency Contracts $ 17 $ — $ — $ — $ — $ — $ — $ — Total Derivative Liabilities $ 729 $ 260 $ 234 $ 219 $ 15 $ 1 $ 18 $ 147 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 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 March 31, 2024 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 $ 95 $ 1 $ 11 $ 1 $ 10 $ — $ 7 $ 1 Offset (1) (1) (1) (1) — — — — Net amounts presented in Current Assets: Other $ 94 $ — $ 10 $ — $ 10 $ — $ 7 $ 1 Noncurrent Gross amounts recognized $ 160 $ 34 $ 46 $ 46 $ — $ — $ 17 $ — Offset (31) (11) (20) (20) — — — — Net amounts presented in Other Noncurrent Assets: Other $ 129 $ 23 $ 26 $ 26 $ — $ — $ 17 $ — Derivative Liabilities March 31, 2024 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 $ 367 $ 175 $ 126 $ 126 $ — $ — $ 19 $ 14 Offset (1) (1) (1) (1) — — — — Cash collateral posted (85) (39) (26) (26) — — (19) — Net amounts presented in Current Liabilities: Other $ 281 $ 135 $ 99 $ 99 $ — $ — $ — $ 14 Noncurrent Gross amounts recognized $ 245 $ 59 $ 62 $ 55 $ 7 $ 1 $ — $ 112 Offset (31) (11) (20) (20) — — — — Cash collateral posted $ (52) $ (30) $ (21) $ (21) $ — $ — $ — $ — Net amounts presented in Other Noncurrent Liabilities: Other $ 162 $ 18 $ 21 $ 14 $ 7 $ 1 $ — $ 112 Derivative Assets December 31, 2023 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 $ 61 $ 6 $ 3 $ 1 $ 2 $ 1 $ 18 $ 1 Offset (2) (1) (1) (1) — — — — Net amounts presented in Current Assets: Other $ 59 $ 5 $ 2 $ — $ 2 $ 1 $ 18 $ 1 Noncurrent Gross amounts recognized $ 128 $ 29 $ 31 $ 31 $ — $ — $ 7 $ — Offset (37) (14) (22) (22) — — — — Net amounts presented in Other Noncurrent Assets: Other $ 91 $ 15 $ 9 $ 9 $ — $ — $ 7 $ — Derivative Liabilities December 31, 2023 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 $ 409 $ 179 $ 149 $ 149 $ — $ — $ 18 $ 20 Offset (2) (1) (1) (1) — — — — Cash collateral posted (96) (48) (30) (30) — — (18) — Net amounts presented in Current Liabilities: Other $ 311 $ 130 $ 118 $ 118 $ — $ — $ — $ 20 Noncurrent Gross amounts recognized $ 320 $ 81 $ 85 $ 70 $ 15 $ 1 $ — $ 127 Offset (37) (14) (22) (22) — — — — Cash collateral posted (66) (38) (28) (28) — — — — Net amounts presented in Other Noncurrent Liabilities: Other $ 217 $ 29 $ 35 $ 20 $ 15 $ 1 $ — $ 127 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. March 31, 2024 Duke Duke Duke Energy Progress Energy (in millions) Energy Carolinas Energy Progress Aggregate fair value of derivatives in a net liability position $ 314 $ 167 $ 147 $ 147 Fair value of collateral already posted 117 70 48 48 Additional cash collateral or letters of credit in the event credit risk-related contingent features were triggered $ 197 $ 97 $ 99 $ 99 December 31, 2023 Duke Duke Duke Energy Progress Energy (in millions) Energy Carolinas Energy Progress Aggregate fair value of derivatives in a net liability position $ 342 $ 175 $ 166 $ 166 Fair value of collateral already posted 144 86 58 58 Additional cash collateral or letters of credit in the event credit risk-related contingent features were triggered $ 198 $ 89 $ 108 $ 108 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	3 Months Ended
	Mar. 31, 2024
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 Available for Sale (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 guidelines 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 March 31, 2024, and December 31, 2023. 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. March 31, 2024 December 31, 2023 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 $ — $ — $ 140 $ — $ — $ 133 Equity securities 5,553 27 7,837 4,942 22 7,278 Corporate debt securities 8 46 659 12 43 632 Municipal bonds 4 16 332 6 16 347 U.S. government bonds 9 76 1,610 24 65 1,575 Other debt securities — 13 209 1 13 178 Total NDTF Investments $ 5,574 $ 178 $ 10,787 $ 4,985 $ 159 $ 10,143 Other Investments Cash and cash equivalents $ — $ — $ 21 $ — $ — $ 31 Equity securities 47 — 173 33 — 158 Corporate debt securities — 6 87 — 6 82 Municipal bonds — 1 79 1 2 77 U.S. government bonds — 3 60 — 2 65 Other debt securities — 3 45 — 2 47 Total Other Investments $ 47 $ 13 $ 465 $ 34 $ 12 $ 460 Total Investments $ 5,621 $ 191 $ 11,252 $ 5,019 $ 171 $ 10,603 Realized gains and losses, which were determined on a specific identification basis, from sales of FV-NI and AFS securities for the three months ended March 31, 2024, and 2023, were as follows. Three Months Ended (in millions) March 31, 2024 March 31, 2023 FV-NI: Realized gains $ 68 $ 26 Realized losses 18 46 AFS: Realized gains 10 8 Realized losses 14 32 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. March 31, 2024 December 31, 2023 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 $ — $ — $ 81 $ — $ — $ 51 Equity securities 3,226 19 4,514 2,886 14 4,196 Corporate debt securities 2 37 397 4 35 390 Municipal bonds — 4 38 — 4 50 U.S. government bonds 4 41 854 13 33 826 Other debt securities — 13 191 1 13 172 Total NDTF Investments $ 3,232 $ 114 $ 6,075 $ 2,904 $ 99 $ 5,685 Realized gains and losses, which were determined on a specific identification basis, from sales of FV-NI and AFS securities for the three months ended March 31, 2024, and 2023, were as follows. Three Months Ended (in millions) March 31, 2024 March 31, 2023 FV-NI: Realized gains $ 53 $ 18 Realized losses 6 29 AFS: Realized gains 4 5 Realized losses 6 20 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. March 31, 2024 December 31, 2023 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 $ — $ — $ 59 $ — $ — $ 82 Equity securities 2,327 8 3,323 2,056 8 3,082 Corporate debt securities 6 9 262 8 8 242 Municipal bonds 4 12 294 6 12 297 U.S. government bonds 5 35 756 11 32 749 Other debt securities — — 18 — — 6 Total NDTF Investments $ 2,342 $ 64 $ 4,712 $ 2,081 $ 60 $ 4,458 Other Investments Cash and cash equivalents $ — $ — $ 15 $ — $ — $ 18 Municipal bonds — — 24 — 1 23 Total Other Investments $ — $ — $ 39 $ — $ 1 $ 41 Total Investments $ 2,342 $ 64 $ 4,751 $ 2,081 $ 61 $ 4,499 Realized gains and losses, which were determined on a specific identification basis, from sales of FV-NI and AFS securities for the three months ended March 31, 2024, and 2023, were as follows. Three Months Ended (in millions) March 31, 2024 March 31, 2023 FV-NI: Realized gains $ 15 $ 8 Realized losses 12 17 AFS: Realized gains 6 3 Realized losses 8 12 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. March 31, 2024 December 31, 2023 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 $ — $ — $ 48 $ — $ — $ 55 Equity securities 2,216 8 3,200 1,956 8 2,970 Corporate debt securities 5 9 248 7 8 229 Municipal bonds 4 12 294 6 12 297 U.S. government bonds 5 22 539 10 18 518 Other debt securities — — 16 — — 6 Total NDTF Investments $ 2,230 $ 51 $ 4,345 $ 1,979 $ 46 $ 4,075 Other Investments Cash and cash equivalents $ — $ — $ 12 $ — $ — $ 14 Total Other Investments $ — $ — $ 12 $ — $ — $ 14 Total Investments $ 2,230 $ 51 $ 4,357 $ 1,979 $ 46 $ 4,089 Realized gains and losses, which were determined on a specific identification basis, from sales of FV-NI and AFS securities for the three months ended March 31, 2024, and 2023, were as follows. Three Months Ended (in millions) March 31, 2024 March 31, 2023 FV-NI: Realized gains $ 15 $ 8 Realized losses 12 17 AFS: Realized gains 6 3 Realized losses 8 12 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. March 31, 2024 December 31, 2023 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 $ — $ — $ 11 $ — $ — $ 27 Equity securities 111 — 123 100 — 112 Corporate debt securities 1 — 14 1 — 13 U.S. government bonds — 13 217 1 14 231 Other debt securities — — 2 — — — Total NDTF Investments (a) $ 112 $ 13 $ 367 $ 102 $ 14 $ 383 Other Investments Cash and cash equivalents $ — $ — $ 2 $ — $ — $ 3 Municipal bonds — — 24 — 1 23 Total Other Investments $ — $ — $ 26 $ — $ 1 $ 26 Total Investments $ 112 $ 13 $ 393 $ 102 $ 15 $ 409 (a) During the three months ended March 31, 2024, and the year ended December 31, 2023, Duke Energy Florida received 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 months ended March 31, 2024, and 2023, were immaterial. 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. March 31, 2024 December 31, 2023 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 $ — $ — $ 1 Equity securities 13 — 108 4 — 98 Corporate debt securities — — 8 — — 8 Municipal bonds — 1 45 1 1 46 U.S. government bonds — — 10 — — 10 Total Investments $ 13 $ 1 $ 172 $ 5 $ 1 $ 163 Realized gains and losses, which were determined on a specific identification basis, from sales of FV-NI and AFS securities for the three months ended March 31, 2024, and 2023, were immaterial. DEBT SECURITY MATURITIES The table below summarizes the maturity date for debt securities. March 31, 2024 Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Indiana Due in one year or less $ 126 $ 10 $ 101 $ 23 $ 78 $ 9 Due after one through five years 715 245 389 264 125 18 Due after five through 10 years 614 359 206 192 14 11 Due after 10 years 1,626 866 658 618 40 25 Total $ 3,081 $ 1,480 $ 1,354 $ 1,097 $ 257 $ 63

Fair Value Measurements

Fair Value Measurements	3 Months Ended
	Mar. 31, 2024
Fair Value Disclosures [Abstract]
Fair Value Measurements	FAIR VALUE MEASUREMENTS Fair value is the exchange price to sell an asset or transfer a liability in an orderly transaction between market participants at the measurement date. The fair value definition focuses on an exit price versus the acquisition cost. Fair value measurements use market data or assumptions market participants would use in pricing the asset or liability, including assumptions about risk and the risks inherent in the inputs to the valuation technique. These inputs may be readily observable, corroborated by market data or generally unobservable. Valuation techniques maximize the use of observable inputs and minimize the use of unobservable inputs. A midmarket pricing convention (the midpoint price between bid and ask prices) is permitted for use as a practical expedient. Fair value measurements are classified in three levels based on the fair value hierarchy as defined by GAAP. Certain investments are not categorized within the fair value hierarchy. These investments are measured at fair value using the net asset value per share practical expedient. The net asset value is derived based on the investment cost, less any impairment, plus or minus changes resulting from observable price changes for an identical or similar investment of the same issuer. Fair value accounting guidance permits entities to elect to measure certain financial instruments that are not required to be accounted for at fair value, such as equity method investments or the Company’s own debt, at fair value. The Duke Energy Registrants have not elected to record any of these items at fair value. Valuation methods of the primary fair value measurements disclosed below are as follows. Investments in equity securities The majority of investments in equity securities are valued using Level 1 measurements. Investments in equity securities are typically valued at the closing price in the principal active market as of the last business day of the quarter. Principal active markets for equity prices include published exchanges such as the 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. Commodity derivatives with observable forward curves are classified as Level 2. If forward price curves are not observable for the full term of the contract and the unobservable period had more than an insignificant impact on the valuation, the commodity derivative is classified as Level 3. In isolation, increases (decreases) in natural gas forward prices result in favorable (unfavorable) fair value adjustments for natural gas purchase contracts; and increases (decreases) in electricity forward prices result in unfavorable (favorable) fair value adjustments for electricity sales contracts. Duke Energy regularly evaluates and validates pricing inputs used to estimate the fair value of certain 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. Foreign currency derivatives Most over-the-counter foreign currency derivatives are valued using financial models that utilize observable inputs for similar instruments and are classified as Level 2. Inputs include forward foreign currency rate curves, notional amounts, foreign currency 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, 2023, 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. March 31, 2024 (in millions) Total Fair Value Level 1 Level 2 Level 3 Not Categorized NDTF cash and cash equivalents $ 140 $ 140 $ — $ — $ — NDTF equity securities 7,837 7,802 — — 35 NDTF debt securities 2,810 873 1,937 — — Other equity securities 173 173 — — — Other debt securities 271 50 221 — — Other cash and cash equivalents 21 21 — — — Derivative assets 255 77 172 6 — Total assets 11,507 9,136 2,330 6 35 Derivative liabilities (612) (51) (561) — — Net assets $ 10,895 $ 9,085 $ 1,769 $ 6 $ 35 December 31, 2023 (in millions) Total Fair Value Level 1 Level 2 Level 3 Not Categorized NDTF cash and cash equivalents $ 133 $ 133 $ — $ — $ — NDTF equity securities 7,278 7,241 — — 37 NDTF debt securities 2,732 829 1,903 — — Other equity securities 158 158 — — — Other debt securities 271 55 216 — — Other cash and cash equivalents 31 31 — — — Derivative assets 189 37 137 15 — Total assets 10,792 8,484 2,256 15 37 Derivative liabilities (729) (60) (669) — — Net assets $ 10,063 $ 8,424 $ 1,587 $ 15 $ 37 The following table provides reconciliations of beginning and ending balances of assets and liabilities measured at fair value using Level 3 measurements. Derivatives (net) Three Months Ended March 31, (in millions) 2024 2023 Balance at beginning of period $ 15 $ 34 Purchases, sales, issuances and settlements: Settlements (13) (20) Total gains (losses) included on the Condensed Consolidated Balance Sheet 4 (2) Balance at end of period $ 6 $ 12 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. March 31, 2024 (in millions) Total Fair Value Level 1 Level 2 Not Categorized NDTF cash and cash equivalents $ 81 $ 81 $ — $ — NDTF equity securities 4,514 4,479 — 35 NDTF debt securities 1,480 418 1,062 — Other AFS debt securities — — — — Derivative assets 35 — 35 — Total assets 6,110 4,978 1,097 35 Derivative liabilities (234) — (234) — Net assets $ 5,876 $ 4,978 $ 863 $ 35 December 31, 2023 (in millions) Total Fair Value Level 1 Level 2 Not Categorized NDTF cash and cash equivalents $ 51 $ 51 $ — $ — NDTF equity securities 4,196 4,159 — 37 NDTF debt securities 1,438 375 1,063 — Derivative assets 35 — 35 — Total assets 5,720 4,585 1,098 37 Derivative liabilities (260) — (260) — Net assets $ 5,460 $ 4,585 $ 838 $ 37 PROGRESS ENERGY The following table provides recorded balances for assets and liabilities measured at fair value on a recurring basis on the Condensed Consolidated Balance Sheets. March 31, 2024 December 31, 2023 (in millions) Total Fair Value Level 1 Level 2 Total Fair Value Level 1 Level 2 NDTF cash and cash equivalents $ 59 $ 59 $ — $ 82 $ 82 $ — NDTF equity securities 3,323 3,323 — 3,082 3,082 — NDTF debt securities 1,330 455 875 1,294 454 840 Other debt securities 24 — 24 23 — 23 Other cash and cash equivalents 15 15 — 18 18 — Derivative assets 57 — 57 34 — 34 Total assets 4,808 3,852 956 4,533 3,636 897 Derivative liabilities (188) — (188) (234) — (234) Net assets $ 4,620 $ 3,852 $ 768 $ 4,299 $ 3,636 $ 663 DUKE ENERGY PROGRESS The following table provides recorded balances for assets and liabilities measured at fair value on a recurring basis on the Condensed Consolidated Balance Sheets. March 31, 2024 December 31, 2023 (in millions) Total Fair Value Level 1 Level 2 Total Fair Value Level 1 Level 2 NDTF cash and cash equivalents $ 48 $ 48 $ — $ 55 $ 55 $ — NDTF equity securities 3,200 3,200 — 2,970 2,970 — NDTF debt securities 1,097 280 817 1,050 266 784 Other cash and cash equivalents 12 12 — 14 14 — Derivative assets 47 — 47 32 — 32 Total assets 4,404 3,540 864 4,121 3,305 816 Derivative liabilities (181) — (181) (219) — (219) Net assets $ 4,223 $ 3,540 $ 683 $ 3,902 $ 3,305 $ 597 DUKE ENERGY FLORIDA The following table provides recorded balances for assets and liabilities measured at fair value on a recurring basis on the Condensed Consolidated Balance Sheets. March 31, 2024 December 31, 2023 (in millions) Total Fair Value Level 1 Level 2 Total Fair Value Level 1 Level 2 NDTF cash and cash equivalents $ 11 $ 11 $ — $ 27 $ 27 $ — NDTF equity securities 123 123 — 112 112 — NDTF debt securities 233 175 58 244 188 56 Other debt securities 24 — 24 23 — 23 Other cash and cash equivalents 2 2 — 3 3 — Derivative assets 10 — 10 2 — 2 Total assets 403 311 92 411 330 81 Derivative liabilities (7) — (7) (15) — (15) Net assets $ 396 $ 311 $ 85 $ 396 $ 330 $ 66 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 March 31, 2024, and December 31, 2023. DUKE ENERGY INDIANA The following table provides recorded balances for assets and liabilities measured at fair value on a recurring basis on the Condensed Consolidated Balance Sheets. March 31, 2024 December 31, 2023 (in millions) Total Fair Value Level 1 Level 2 Level 3 Total Fair Value Level 1 Level 2 Level 3 Other equity securities $ 108 $ 108 $ — $ — $ 98 $ 98 $ — $ — Other debt securities 63 — 63 — 64 — 64 — Other cash and cash equivalents 1 1 — — 1 1 — — Derivative assets 24 2 17 5 25 5 7 13 Total assets 196 111 80 5 188 104 71 13 Derivative liabilities (19) (19) — — (18) (18) — — Net assets $ 177 $ 92 $ 80 $ 5 $ 170 $ 86 $ 71 $ 13 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 March 31, (in millions) 2024 2023 Balance at beginning of period $ 13 $ 29 Purchases, sales, issuances and settlements: Settlements (11) (19) Total gains included on the Condensed Consolidated Balance Sheet 3 1 Balance at end of period $ 5 $ 11 PIEDMONT The following table provides recorded balances for assets and liabilities measured at fair value on a recurring basis on the Condensed Consolidated Balance Sheets. March 31, 2024 December 31, 2023 (in millions) Total Fair Value Level 1 Level 2 Total Fair Value Level 1 Level 2 Derivative assets $ 1 $ 1 $ — $ 1 $ 1 $ — Derivative liabilities (126) — (126) (147) — (147) Net (liabilities) assets $ (125) $ 1 $ (126) $ (146) $ 1 $ (147) QUANTITATIVE INFORMATION ABOUT UNOBSERVABLE INPUTS The following tables include quantitative information about the Duke Energy Registrants' derivatives classified as Level 3. March 31, 2024 Weighted Fair Value Average Investment Type (in millions) Valuation Technique Unobservable Input Range Range Duke Energy Ohio FTRs $ 1 RTO auction pricing FTR price – per MWh $ 0.17 - $ 2.13 $ 0.49 Duke Energy Indiana FTRs 5 RTO auction pricing FTR price – per MWh — - 8.95 1.45 Duke Energy Total Level 3 derivatives $ 6 December 31, 2023 Weighted Fair Value Average Investment Type (in millions) Valuation Technique Unobservable Input Range Range Duke Energy Ohio FTRs $ 2 RTO auction pricing FTR price – per MWh $ 0.36 - $ 2.11 $ 0.71 Duke Energy Indiana FTRs 13 RTO auction pricing FTR price – per MWh (1.05) - 9.64 1.26 Duke Energy Total Level 3 derivatives $ 15 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. March 31, 2024 December 31, 2023 (in millions) Book Value Fair Value Book Value Fair Value Duke Energy (a) $ 77,253 $ 70,512 $ 75,252 $ 69,790 Duke Energy Carolinas 17,019 15,723 16,012 15,077 Progress Energy 24,198 22,505 23,759 22,553 Duke Energy Progress 12,178 10,824 11,714 10,595 Duke Energy Florida 10,377 9,888 10,401 10,123 Duke Energy Ohio 3,939 3,685 3,518 3,310 Duke Energy Indiana 4,800 4,437 4,502 4,230 Piedmont 3,669 3,273 3,668 3,336 (a) Book value of long-term debt inc ludes $1.1 billion and $1.0 billion at March 31, 2024, and December 31, 2023, respectively, of net unamortized debt discount and premium 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 March 31, 2024, and December 31, 2023, 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	3 Months Ended
	Mar. 31, 2024
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 three months ended March 31, 2024, and the year ended December 31, 2023, 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 DEPR credit facility are reflected on the Condensed Consolidated Balance Sheets as Long-Term Debt. Amounts borrowed under the DERF and DEFR credit facilities are reflected on the Condensed Consolidated Balance Sheets as Current maturities of long-term debt. The most significant activity that impacts the economic performance of DERF, DEPR and DEFR are the decisions made to manage delinquent receivables. Duke Energy Carolinas, Duke Energy Progress and Duke Energy Florida are considered the primary beneficiaries and consolidate DERF, DEPR and DEFR, respectively, as they make those decisions. In April 2024, Duke Energy Florida repaid all outstanding DEFR borrowings totaling $325 million and terminated the related DEFR credit facility. Additionally, Duke Energy Florida's related restricted receivables outstanding at DEFR at the time of termination totaled $459 million and were transferred back to Duke Energy Florida to be collected and reported as Receivables on the Condensed Consolidated Balance Sheets. Receivables Financing – CRC CRC is a bankruptcy remote, special purpose entity indirectly owned by Duke Energy. On a revolving basis, CRC bought certain accounts receivable arising from the sale of electricity, natural gas and related services from Duke Energy Ohio and Duke Energy Indiana. CRC then borrowed amounts under a credit facility to buy the receivables from Duke Energy Ohio and Duke Energy Indiana. Borrowing availability from the credit facility was limited to the amount of qualified receivables sold to CRC, which generally excluded receivables past due more than a predetermined number of days and reserved for expected past-due balances. The sole source of funds to satisfy the related debt obligation was cash collections from the receivables. The proceeds Duke Energy Ohio and Duke Energy Indiana received from the sale of receivables to CRC were approximately 75% cash and 25% in the form of a subordinated note from CRC. The subordinated note was a retained interest in the receivables sold. Depending on collection experience, additional equity infusions to CRC would be required by Duke Energy to maintain a minimum equity balance of $3 million. CRC was considered a VIE because (i) equity capitalization was insufficient to support its operations, (ii) power to direct the activities that most significantly impact the economic performance of the entity was not held by the equity holder and (iii) deficiencies in net worth of CRC were funded by Duke Energy. The most significant activities that impacted the economic performance of CRC were decisions made to manage delinquent receivables. Duke Energy was considered the primary beneficiary and consolidated CRC as it made these decisions. Neither Duke Energy Ohio nor Duke Energy Indiana consolidated CRC. In March 2024, Duke Energy repaid all outstanding CRC borrowings totaling $350 million and terminated the related CRC credit facility. Additionally, Duke Energy's related restricted receivables outstanding at CRC at the time of termination totaled $682 million, consisting of $316 million and $366 million of restricted receivables that were transferred back to Duke Energy Indiana and Duke Energy Ohio, respectively, to be collected and reported as Receivables on the Condensed Consolidated Balance Sheets. 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 (a) January 2025 April 2025 (b) Credit facility amount (a) $ 500 $ 400 (b) Amounts borrowed at March 31, 2024 — 500 400 325 Amounts borrowed at December 31, 2023 312 500 400 325 Restricted Receivables at March 31, 2024 — 997 789 467 Restricted Receivables at December 31, 2023 663 991 833 532 (a) In March 2024, Duke Energy repaid all outstanding CRC borrowings and terminated the related $350 million CRC credit facility. (b) In April 2024, Duke Energy Florida repaid all outstanding DEFR borrowings and terminated the related $325 million DEFR credit facility. Nuclear Asset-Recovery Bonds – Duke Energy Florida Project Finance Duke Energy Florida Project Finance, LLC (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) March 31, 2024 December 31, 2023 Regulatory Assets: Current 59 59 Current Assets: Other 9 37 Other Noncurrent Assets: Regulatory assets 790 803 Current Liabilities: Other 2 8 Current maturities of long-term debt 59 59 Long-Term Debt 800 831 Storm Recovery Bonds – Duke Energy Carolinas NC Storm Funding and Duke Energy Progress NC Storm Funding Duke Energy Carolinas NC Storm Funding, LLC (DECNCSF) and Duke Energy Progress NC Storm Funding, LLC (DEPNCSF) are bankruptcy remote, wholly owned special purpose subsidiaries of Duke Energy Carolinas and Duke Energy Progress, respectively. These entities were formed in 2021 for the sole purpose of issuing storm recovery bonds to finance certain of Duke Energy Carolinas’ and Duke Energy Progress’ unrecovered regulatory assets related to storm costs incurred in North Carolina. In November 2021, DECNCSF and DEPNCSF issued $237 million and $770 million of senior secured bonds, respectively and used the proceeds to acquire storm recovery property from Duke Energy Carolinas and Duke Energy Progress. The storm recovery property was created by state legislation and NCUC financing orders for the purpose of financing storm costs incurred in 2018 and 2019. The storm recovery property acquired includes the right to impose, bill, collect and adjust a non-bypassable charge from all Duke Energy Carolinas’ and Duke Energy Progress’ North Carolina retail customers until the bonds are paid in full and all financing costs have been recovered. The storm recovery bonds are secured by the storm recovery property and cash collections from the storm recovery charges are the sole source of funds to satisfy the debt obligation. The bondholders have no recourse to Duke Energy Carolinas or Duke Energy Progress. DECNCSF and DEPNCSF are considered VIEs primarily because the equity capitalization is insufficient to support their operations. Duke Energy Carolinas and Duke Energy Progress have the power to direct the significant activities of the VIEs as described above and therefore Duke Energy Carolinas and Duke Energy Progress are considered the primary beneficiaries and consolidate DECNCSF and DEPNCSF, respectively. The following table summarizes the impact of these VIEs on Duke Energy Carolinas’ and Duke Energy Progress’ Consolidated Balance Sheets. March 31, 2024 December 31, 2023 Duke Energy Duke Energy Duke Energy Duke Energy (in millions) Carolinas Progress Carolinas Progress Regulatory Assets: Current $ 12 $ 39 $ 12 $ 39 Current Assets: Other 5 18 9 31 Other Noncurrent Assets: Regulatory assets 193 633 196 643 Other Noncurrent Assets: Other 1 4 1 2 Current Liabilities: Other 1 4 10 34 Current maturities of long-term debt 11 34 3 8 Long-Term Debt 203 663 208 680 Storm Recovery Bonds – Duke Energy Progress SC Storm Funding Duke Energy Progress SC Storm Funding, LLC (DEPSCSF) is a bankruptcy remote, wholly owned special purpose subsidiary of Duke Energy Progress. This entity was formed in 2023 for the sole purpose of issuing storm recovery bonds to finance certain of Duke Energy Progress’ unrecovered regulatory assets related to storm costs incurred in South Carolina. In April 2024, DEPSCSF issued $177 million of senior secured bonds an d used the proceeds to acquire storm recovery property from Duke Energy Progress. The storm recovery property was created by state legislation and a PSCSC financing order for the purpose of financing storm costs incurred from 2014 through 2022. The storm recovery property acquired includes the right to impose, bill, collect and adjust a non-bypassable charge from all Duke Energy Progress’ South Carolina retail customers until the bonds are paid in full and all financing costs have been recovered. The storm recovery bonds are secured by the storm recovery property and cash collections from the storm recovery charges are the sole source of funds to satisfy the debt obligation. The bondholders have no recourse to Duke Energy Progress. DEPSCSF is considered a VIE primarily because the equity capitalization is insufficient to support their operations. Duke Energy Progress has the power to direct the significant activities of the VIE as described above and therefore Duke Energy Progress is considered the primary beneficiary and consolidates DEPSCSF. Procurement Company – Duke Energy Florida Duke Energy Florida Purchasing Company, LLC (DEF ProCo) is a wholly owned special purpose subsidiary of Duke Energy Florida. DEF ProCo was formed in 2023 as the primary procurer of equipment, materials and supplies for Duke Energy Florida. DEF ProCo interacts with third-party suppliers on Duke Energy Florida’s behalf with credit and risk support provided by Duke Energy Florida. DEF ProCo is a qualified reseller under Florida tax law and conveys acquired assets to Duke Energy Florida through leases on each acquired asset. This entity is considered a VIE primarily because the equity capitalization is insufficient to support their operations. Duke Energy Florida has the power to direct the significant activities of this VIE as described above and therefore Duke Energy Florida is considered the primary beneficiary and consolidates the procurement company. The following table summarizes the impact of this VIE on Duke Energy Florida's Consolidated Balance Sheets. (in millions) March 31, 2024 December 31, 2023 Inventory $ 470 $ 462 Accounts Payable 179 188 NON-CONSOLIDATED VIEs The following tables summarize the impact of non-consolidated VIEs on the Condensed Consolidated Balance Sheets. March 31, 2024 Duke Energy Duke Duke Natural Gas Energy Energy (in millions) Investments Ohio Indiana Receivables from affiliated companies $ — $ — $ — Investments in equity method unconsolidated affiliates 63 — — Other noncurrent assets 30 — — Total assets $ 93 $ — $ — Other current liabilities 1 — — Other noncurrent liabilities 6 — — Total liabilities $ 7 $ — $ — Net assets $ 86 $ — $ — December 31, 2023 Duke Energy Duke Duke Natural Gas Energy Energy (in millions) Investments Ohio Indiana Receivables from affiliated companies $ — $ 150 $ 208 Investments in equity method unconsolidated affiliates 67 — — Other noncurrent assets 43 — — Total assets $ 110 $ 150 $ 208 Other current liabilities 4 — — Other noncurrent liabilities 5 — — Total liabilities $ 9 $ — $ — Net assets $ 101 $ 150 $ 208 The Duke Energy Registrants are not aware of any situations where the maximum exposure to loss significantly exceeds the carrying values shown above. Natural Gas Investments Duke Energy has investments in various joint ventures including pipeline and renewable natural gas 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. 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 as of December 31, 2023. The subordinated notes held by Duke Energy Ohio and Duke Energy Indiana are stated at fair value as of December 31, 2023. The following table shows the gross and net receivables sold. Duke Energy Ohio Duke Energy Indiana (in millions) March 31, 2024 December 31, 2023 March 31, 2024 December 31, 2023 Receivables sold $ — $ 361 $ — $ 351 Less: Retained interests — 150 — 208 Net receivables sold $ — $ 211 $ — $ 143 The following table shows sales and cash flows related to receivables sold and reflects CRC activity prior to its termination in March 2024. Duke Energy Ohio Duke Energy Indiana Three Months Ended Three Months Ended March 31, March 31, (in millions) 2024 2023 2024 2023 Sales Receivables sold $ 474 $ 725 $ 473 $ 942 Loss recognized on sale 7 9 6 10 Cash flows Cash proceeds from receivables sold $ 478 $ 750 $ 523 $ 1,028 Return received on retained interests 4 6 4 8 Cash flows from sales of receivables are reflected within Cash Flows From Operating Activities and Cash Flows from Investing Activities on Duke Energy Ohio’s and Duke Energy Indiana’s Condensed Consolidated Statements of Cash Flows.

Revenue

Revenue	3 Months Ended
	Mar. 31, 2024
Revenue from Contract with Customer [Abstract]
Revenue	REVENUE Duke Energy earns substantially all of its revenues through its reportable segments, EU&I and GU&I. Electric Utilities and Infrastructure EU&I 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) 2024 2025 2026 2027 2028 Thereafter Total Progress Energy $ 52 $ 30 $ 7 $ 7 $ 7 $ 29 $ 132 Duke Energy Progress 6 — — — — — 6 Duke Energy Florida 46 30 7 7 7 29 126 Duke Energy Indiana 12 17 17 15 5 — 66 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 GU&I earns its revenue through retail and wholesale natural gas service through the transportation, distribution and sale of natural gas. Duke Energy generally provides retail and wholesale natural gas service customers with all natural gas load requirements. Additionally, while natural gas can be stored, substantially all natural gas provided by Duke Energy is consumed by customers simultaneously with receipt of delivery. Fixed-capacity payments under long-term contracts for the GU&I 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) 2024 2025 2026 2027 2028 Thereafter Total Piedmont $ 49 $ 61 $ 51 $ 49 $ 46 $ 195 $ 451 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 March 31, 2024 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 $ 3,115 $ 1,058 $ 1,517 $ 742 $ 775 $ 253 $ 287 $ — General 1,934 717 866 422 444 152 201 — Industrial 822 340 266 177 89 32 183 — Wholesale 554 138 355 326 29 14 48 — Other revenues 253 99 149 78 71 22 34 — Total Electric Utilities and Infrastructure revenue from contracts with customers $ 6,678 $ 2,352 $ 3,153 $ 1,745 $ 1,408 $ 473 $ 753 $ — Gas Utilities and Infrastructure Residential $ 520 $ — $ — $ — $ — $ 147 $ — $ 373 Commercial 240 — — — — 57 — 183 Industrial 47 — — — — 11 — 38 Power Generation — — — — — — — 8 Other revenues 40 — — — — 5 — 35 Total Gas Utilities and Infrastructure revenue from contracts with customers $ 847 $ — $ — $ — $ — $ 220 $ — $ 637 Other Revenue from contracts with customers $ 7 $ — $ — $ — $ — $ — $ — $ — Total revenue from contracts with customers $ 7,532 $ 2,352 $ 3,153 $ 1,745 $ 1,408 $ 693 $ 753 $ 637 Other revenue sources (a) $ 139 $ 55 $ 75 $ 43 $ 28 $ (15) $ 6 $ 39 Total revenues $ 7,671 $ 2,407 $ 3,228 $ 1,788 $ 1,436 $ 678 $ 759 $ 676 Three Months Ended March 31, 2023 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 $ 2,851 $ 824 $ 1,421 $ 607 $ 814 $ 234 $ 372 $ — General 1,831 588 841 358 483 135 270 — Industrial 891 296 272 177 95 71 251 — Wholesale 550 135 348 319 29 9 58 — Other revenues 144 78 121 68 53 27 15 — Total Electric Utilities and Infrastructure revenue from contracts with customers $ 6,267 $ 1,921 $ 3,003 $ 1,529 $ 1,474 $ 476 $ 966 $ — Gas Utilities and Infrastructure Residential $ 507 $ — $ — $ — $ — $ 162 $ — $ 345 Commercial 233 — — — — 58 — 175 Industrial 47 — — — — 9 — 37 Power Generation — — — — — — — 23 Other revenues 40 — — — — 6 — 19 Total Gas Utilities and Infrastructure revenue from contracts with customers $ 827 $ — $ — $ — $ — $ 235 $ — $ 599 Other Revenue from contracts with customers $ 7 $ — $ — $ — $ — $ — $ — $ — Total revenue from contracts with customers $ 7,101 $ 1,921 $ 3,003 $ 1,529 $ 1,474 $ 711 $ 966 $ 599 Other revenue sources (a) $ 175 $ 13 $ 45 $ 4 $ 36 $ (2) $ 9 $ 76 Total revenues $ 7,276 $ 1,934 $ 3,048 $ 1,533 $ 1,510 $ 709 $ 975 $ 675 (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. The following table presents the reserve for credit losses for trade and other receivables. Three Months Ended March 31, 2023 and 2024 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, 2022 $ 216 $ 68 $ 81 $ 44 $ 36 $ 6 $ 4 $ 14 Write-Offs (42) (20) (22) (9) (12) — — (1) Credit Loss Expense 16 7 6 1 5 1 — 1 Other Adjustments 24 15 10 9 1 — — — Balance at March 31, 2023 $ 214 $ 70 $ 75 $ 45 $ 30 $ 7 $ 4 $ 14 Balance at December 31, 2023 $ 205 $ 56 $ 74 $ 44 $ 31 $ 9 $ 5 $ 11 Write-Offs (32) (12) (16) (7) (9) — — (1) Credit Loss Expense 10 7 9 4 5 1 2 2 Other Adjustments 21 11 6 6 — 31 9 — Balance at March 31, 2024 $ 204 $ 62 $ 73 $ 47 $ 27 $ 41 $ 16 $ 12 Trade and other receivables are evaluated based on an estimate of the risk of loss over the life of the receivable and current and historical conditions using supportable assumptions. Management evaluates the risk of loss for trade and other receivables by comparing the historical write-off amounts to total revenue over a specified period. Historical loss rates are adjusted due to the impact of current conditions, as well as forecasted conditions over a reasonable time period. The calculated write-off rate can be applied to the receivable balance for which an established reserve does not already exist. Management reviews the assumptions and risk of loss periodically for trade and other receivables. The aging of trade receivables is presented in the table below. March 31, 2024 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Unbilled Revenue (a)(b) $ 1,066 $ 361 $ 361 $ 250 $ 111 $ 113 $ 174 $ 57 Current 2,301 706 967 586 380 215 192 208 1-31 days past due 265 82 85 50 35 33 39 25 31-61 days past due 95 33 33 24 9 15 7 7 61-91 days past due 46 18 11 8 3 7 3 7 91+ days past due 215 64 57 21 36 67 23 4 Deferred Payment Arrangements (c) 115 40 39 29 10 28 7 1 Trade and Other Receivables $ 4,103 $ 1,304 $ 1,553 $ 968 $ 584 $ 478 $ 445 $ 309 December 31, 2023 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Unbilled Revenue (a)(d) $ 1,273 $ 399 $ 401 $ 280 $ 121 $ 4 $ 22 $ 108 Current 2,306 680 1,009 612 395 48 87 199 1-31 days past due 275 97 91 41 50 12 14 9 31-61 days past due 78 20 34 23 11 3 7 2 61-91 days past due 47 15 17 10 7 2 4 1 91+ days past due 253 67 69 24 45 46 27 3 Deferred Payment Arrangements (c) 104 34 43 26 17 6 — — Trade and Other Receivables $ 4,336 $ 1,312 $ 1,664 $ 1,016 $ 646 $ 121 $ 161 $ 322 (a) Unbilled revenues are recognized by applying customer billing rates to the estimated volumes of energy or natural gas delivered but not yet billed and are included within Receivables and Receivables of VIEs on the Condensed Consolidated Balance Sheets. (b) In March 2024, Duke Energy repaid all outstanding CRC borrowings and terminated the related CRC credit facility. Duke Energy's related restricted receivables outstanding at CRC at the time of termination totaled $682 million, consisting of $316 million and $366 million of restricted receivables that were transferred back to Duke Energy Indiana and Duke Energy Ohio, respectively, to be collected and reported as Receivables on the Condensed Consolidated Balance Sheets. See Note 12 for further information. (c) Due to ongoing financial hardships impacting customers, Duke Energy has permitted customers to defer payment of past-due amounts through installment payment plans. (d) Duke Energy Ohio and Duke Energy Indiana sold, on a revolving basis, nearly all of their retail accounts receivable, including receivables for unbilled revenues, to an affiliate, CRC, and accounted for the transfers of receivables as sales. Accordingly, the receivables sold were not reflected on the Condensed Consolidated Balance Sheets of Duke Energy Ohio and Duke Energy Indiana. These receivables for unbilled revenues are $141 million and $197 million for Duke Energy Ohio and Duke Energy Indiana, respectively, as of December 31, 2023.

Stockholders' Equity

Stockholders' Equity	3 Months Ended
	Mar. 31, 2024
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 equity forward sale agreements or convertible debt, were exercised or settled. Duke Energy applies the if-converted method for calculating any potential dilutive effect of the conversion of the outstanding convertible notes on diluted EPS, if applicable. 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 March 31, (in millions, except per share amounts) 2024 2023 Net Income available to Duke Energy common stockholders $ 1,099 $ 765 Less: Loss from discontinued operations attributable to Duke Energy common stockholders (3) (145) Accumulated preferred stock dividends adjustment 12 12 Less: Impact of participating securities 2 1 Income from continuing operations available to Duke Energy common stockholders $ 1,112 $ 921 Loss from discontinued operations, net of tax $ (3) $ (209) Add: Loss attributable to NCI — 64 Loss from discontinued operations attributable to Duke Energy common stockholders $ (3) $ (145) Weighted average common shares outstanding – basic and diluted 771 770 EPS from continuing operations available to Duke Energy common stockholders Basic and diluted (a) $ 1.44 $ 1.20 Loss Per Share from discontinued operations attributable to Duke Energy common stockholders Basic and diluted (a) $ — $ (0.19) Potentially dilutive items excluded from the calculation (b) 2 2 Dividends declared per common share $ 1.025 $ 1.005 Dividends declared on Series A preferred stock per depositary share (c) $ 0.359 $ 0.359 Dividends declared on Series B preferred stock per share (d) $ 24.375 $ 24.375 (a) For the periods presented subsequent to issuance in April 2023, the convertible notes were excluded from the calculations of diluted EPS because the effect was antidilutive. (b) Performance stock awards were not included in the dilutive securities calculation because the performance measures related to the awards had not been met. (c) 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. (d) 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 2022, 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 2025. In March 2024, Duke Energy marketed its first tranche, issuing 0.8 million shares of common stock through an equity forward transaction under the ATM program with an initial forward price of $92.77 per share. The equity forward requires 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 agreements or net settle in whole or in part through the delivery or receipt of cash or shares. The settlement alternative is at Duke Energy's election. No amounts have or will be recorded in Duke Energy's Condensed Consolidated Financial Statements with respect to the ATM offering until settlement of the equity forward occurs, which is expected during or prior to December 2024. The initial forward sale price will be subject to adjustment on a daily basis based on a floating interest rate factor and will decrease by other fixed amounts specified in the relevant forward sale agreement. Until settlement of the equity forward, earnings per share dilution resulting from the agreement, if any, will be determined under the treasury stock method.

Employee Benefit Plans

Employee Benefit Plans	3 Months Ended
	Mar. 31, 2024
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 March 31, 2024 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Service cost $ 28 $ 9 $ 8 $ 5 $ 3 $ 1 $ 2 $ 1 Interest cost on projected benefit obligation 82 20 26 12 14 4 6 2 Expected return on plan assets (154) (41) (54) (25) (29) (6) (10) (5) Amortization of actuarial loss 8 2 2 1 1 — 1 1 Amortization of prior service credit (3) — — — — — — (2) Amortization of settlement charges 5 2 1 1 — — — 1 Net periodic pension costs $ (34) $ (8) $ (17) $ (6) $ (11) $ (1) $ (1) $ (2) Three Months Ended March 31, 2023 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Service cost $ 30 $ 10 $ 9 $ 5 $ 3 $ 1 $ 1 $ 1 Interest cost on projected benefit obligation 86 21 27 12 14 4 7 2 Expected return on plan assets (147) (40) (50) (23) (26) (6) (10) (5) Amortization of actuarial loss 2 — 1 — 1 — 1 — Amortization of prior service credit (3) — — — — — — (2) Amortization of settlement charges 5 2 1 1 — — — 1 Net periodic pension costs $ (27) $ (7) $ (12) $ (5) $ (8) $ (1) $ (1) $ (3) NON-QUALIFIED PENSION PLANS Net periodic pension costs for non-qualified pension plans were not material for the three months ended March 31, 2024, and 2023. OTHER POST-RETIREMENT BENEFIT PLANS Net periodic costs for OPEB plans were not material for the three months ended March 31, 2024, and 2023.

Income Taxes

Income Taxes	3 Months Ended
	Mar. 31, 2024
Income Tax Disclosure [Abstract]
Income Taxes	INCOME TAXES On August 16, 2022, the IRA was signed into law. Among other provisions, the IRA created a new, zero-emission nuclear power PTC available for taxpayers beginning January 1, 2024. In the first quarter of 2024, Duke Energy Carolinas and Duke Energy Progress recorded a PTC deferred tax asset of approximately $107 million and $14 million, respectively. These amounts represent the net realizable value of the PTCs, which were deferred to a regulatory liability. The Subsidiary Registrants will work with the state utility commissions on the best regulatory process to pass the net realizable value back to customers over time. See Note 4 for additional information on Duke Energy Carolinas' approval for a stand-alone rider starting January 1, 2025. The Company will continue to assess its calculations and interpretations as new information and guidance becomes available. EFFECTIVE TAX RATES The ETRs from continuing operations for each of the Duke Energy Registrants are included in the following table. Three Months Ended March 31, 2024 2023 Duke Energy 13.4 % 13.8 % Duke Energy Carolinas 11.5 % 11.4 % Progress Energy 16.5 % 16.7 % Duke Energy Progress 15.0 % 14.6 % Duke Energy Florida 19.4 % 19.9 % Duke Energy Ohio 16.8 % 16.7 % Duke Energy Indiana 17.3 % 17.2 % Piedmont 19.6 % 17.7 % The increase in the ETR for Piedmont for the three months ended March 31, 2024, was primarily due to a decrease in the amortization of EDIT.

Subsequent Events

Subsequent Events	3 Months Ended
	Mar. 31, 2024
Subsequent Events [Abstract]
Subsequent Events	SUBSEQUENT EVENTS For information on subsequent events related to regulatory matters, commitments and contingencies, debt and credit facilities, derivatives, and variable interest entities see Notes 4, 5, 6, 9, and 12, respectively.

Pay vs Performance Disclosure

Pay vs Performance Disclosure - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Pay vs Performance Disclosure
Net Income (Loss)	$ 1,138	$ 804

Insider Trading Arrangements

Insider Trading Arrangements	3 Months Ended
	Mar. 31, 2024
Trading Arrangements, by Individual
Rule 10b5-1 Arrangement Adopted	false
Non-Rule 10b5-1 Arrangement Adopted	false
Rule 10b5-1 Arrangement Terminated	false
Non-Rule 10b5-1 Arrangement Terminated	false

Organization and Basis of Pre_2

Organization and Basis of Presentation (Policy)	3 Months Ended
	Mar. 31, 2024
Organization, Consolidation and Presentation of Financial Statements [Abstract]
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's Annual Report on Form 10-K for the year ended December 31, 2023. 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. NONCONTROLLING INTEREST Duke Energy maintains a controlling financial interest in certain less than wholly owned 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 Sheets. 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.
Discontinued Operations	Discontinued Operations Duke Energy has elected to present cash flows of discontinued operations combined with cash flows of continuing operations. Unless otherwise noted, the notes to these condensed consolidated financial statements exclude amounts related to discontinued operations for all periods presented. For the three months ended March 31, 2024, and 2023, the Loss From Discontinued Operations, net of tax on Duke Energy's Condensed Consolidated Statements of Operations includes amounts related to noncontrolling interests. A portion of Noncontrolling interests on Duke Energy's Condensed Consolidated Balance Sheets relates to discontinued operations for the periods presented. See Note 2 for discussion of discontinued operations related to the Commercial Renewables Disposal Groups.
Cash, Cash Equivalents, and Restricted Cash	CASH, CASH EQUIVALENTS AND RESTRICTED CASH
New Accounting Standards	NEW ACCOUNTING STANDARDS No new accounting standards were adopted by the Duke Energy Registrants in 2024.
Environmental Costs	Liabilities are recorded when losses become probable and are reasonably estimable.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.
Derivatives	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. 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. For the Subsidiary Registrants, bulk power electricity and natural gas purchases flow through fuel adjustment clauses, formula-based contracts or other cost-sharing mechanisms. Differences between the costs included in rates and the incurred costs, including undesignated derivative contracts, are largely deferred as regulatory assets or regulatory liabilities. Piedmont policies allow for the use of financial instruments to hedge commodity price risks. The strategy and objective of these hedging programs are to use the financial instruments to reduce natural gas cost volatility for customers.
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.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.
Revenue from Contract with Customer	Duke Energy earns substantially all of its revenues through its reportable segments, EU&I and GU&I.
Earnings Per Share	Basic EPS is computed by dividing net income available to Duke Energy common stockholders, as adjusted for distributed and undistributed earnings allocated to participating securities and accumulated preferred dividends, by the weighted average number of common shares outstanding during the period. Diluted EPS is computed by dividing net income available to Duke Energy common stockholders, as adjusted for distributed and undistributed earnings allocated to participating securities and accumulated preferred dividends, by the diluted weighted average number of common shares outstanding during the period. Diluted EPS reflects the potential dilution that could occur if securities or other agreements to issue common stock, such as equity forward sale agreements or convertible debt, were exercised or settled. Duke Energy applies the if-converted method for calculating any potential dilutive effect of the conversion of the outstanding convertible notes on diluted EPS, if applicable. 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.
Accounts Payable, Policy	ACCOUNTS PAYABLE Duke Energy has a voluntary supply chain finance program (the “program”) that allows Duke Energy suppliers, at their sole discretion, to sell their receivables from Duke Energy to a global financial institution at a rate that leverages Duke Energy’s credit rating and which may result in favorable terms compared to the rate available to the supplier on their own credit rating. Suppliers participating in the program determine at their sole discretion, which invoices they will sell to the financial institution. Suppliers’ decisions on which invoices are sold do not impact Duke Energy’s payment terms, which are based on commercial terms negotiated between Duke Energy and the supplier regardless of program participation. The commercial terms negotiated between Duke Energy and its suppliers are consistent regardless of whether the supplier elects to participate in the program. Duke Energy does not issue any guarantees with respect to the program and does not participate in negotiations between suppliers and the financial institution. Duke Energy does not have an economic interest in the supplier’s decision to participate in the program and receives no interest, fees or other benefit from the financial institution based on supplier participation in the program.

Organization and Basis of Pre_3

Organization and Basis of Presentation (Tables)	3 Months Ended
	Mar. 31, 2024
Organization, Consolidation and Presentation of Financial Statements [Abstract]
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. March 31, 2024 December 31, 2023 Duke Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Duke Energy Progress Energy Energy Energy Carolinas Energy Progress Florida Energy Carolinas Energy Progress Florida Current Assets Cash and cash equivalents $ 459 $ 5 $ 49 $ 27 $ 4 $ 253 $ 9 $ 59 $ 18 $ 24 Other 33 6 27 18 9 76 9 67 31 36 Other Noncurrent Assets Other 17 1 10 4 7 16 1 9 2 7 Total cash, cash equivalents and restricted cash $ 509 $ 12 $ 86 $ 49 $ 20 $ 345 $ 19 $ 135 $ 51 $ 67
Schedule of Utility Inventory	The components of inventory are presented in the tables below. March 31, 2024 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 $ 3,130 $ 1,078 $ 1,547 $ 1,039 $ 508 $ 146 $ 316 $ 12 Coal 840 357 240 150 90 27 216 — Natural gas, oil and other fuel 311 43 200 105 95 12 2 53 Total inventory $ 4,281 $ 1,478 $ 1,987 $ 1,294 $ 693 $ 185 $ 534 $ 65 December 31, 2023 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 $ 3,086 $ 1,075 $ 1,465 $ 963 $ 502 $ 139 $ 361 $ 12 Coal 842 364 231 154 77 28 219 — Natural gas, oil and other fuel 364 45 205 110 95 12 2 100 Total inventory $ 4,292 $ 1,484 $ 1,901 $ 1,227 $ 674 $ 179 $ 582 $ 112
Schedule of Accounts Payable Finance Programs	The following table represents the changes in confirmed obligations outstanding for the three months ended March 31, 2024, and 2023. Three Months Ended March 31, 2023 and 2024 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Confirmed obligations outstanding at December 31, 2022 $ 87 $ 6 $ 19 $ 8 $ 11 $ 5 $ — $ 57 Invoices confirmed during the period 59 10 22 11 11 1 — 25 Confirmed invoices paid during the period (94) (9) (26) (13) (13) (6) — (53) Confirmed obligations outstanding at March 31, 2023 $ 52 $ 7 $ 15 $ 6 $ 9 $ — $ — $ 29 Confirmed obligations outstanding at December 31, 2023 $ 50 $ — $ 3 $ — $ 3 $ — $ — $ 47 Invoices confirmed during the period 57 — 1 — 1 — — 56 Confirmed invoices paid during the period (31) — (2) — (2) — — (29) Confirmed obligations outstanding at March 31, 2024 $ 76 $ — $ 2 $ — $ 2 $ — $ — $ 74

Dispositions (Tables)

Dispositions (Tables)	3 Months Ended
	Mar. 31, 2024
Discontinued Operations and Disposal Groups [Abstract]
Disposal Groups, Including Discontinued Operations	The following table presents the carrying values of the major classes of Assets held for sale and Liabilities associated with assets held for sale included in Duke Energy's Consolidated Balance Sheets. (in millions) March 31, 2024 December 31, 2023 Current Assets Held for Sale Other $ 11 $ 14 Total current assets held for sale 11 14 Noncurrent Assets Held for Sale Property, Plant and Equipment Cost 357 247 Accumulated depreciation and amortization (57) (57) Net property, plant and equipment 300 190 Operating lease right-of-use assets, net 4 4 Other 4 3 Total other noncurrent assets held for sale 8 7 Total Assets Held for Sale $ 319 $ 211 Current Liabilities Associated with Assets Held for Sale Accounts payable $ 97 $ 9 Taxes accrued 1 3 Current maturities of long-term debt 44 5 Unrealized losses on commodity hedges 74 68 Other 35 37 Total current liabilities associated with assets held for sale 251 122 Noncurrent Liabilities Associated with Assets Held for Sale Long-Term debt — 39 Operating lease liabilities 5 5 Asset retirement obligations 8 8 Unrealized losses on commodity hedges 102 94 Other 11 11 Total other noncurrent liabilities associated with assets held for sale 126 157 Total Liabilities Associated with Assets Held for Sale $ 377 $ 279 As of March 31, 2024, and December 31, 2023, the noncontrolling interest balance is $66 million. The following table presents the results of the Commercial Renewables Disposal Groups, which are included in Loss from Discontinued Operations, net of tax in Duke Energy's Consolidated Statements of Operations. Three Months Ended March 31, (in millions) 2024 2023 Operating revenues $ (6) $ 80 Operation, maintenance and other 4 89 Property and other taxes — 10 Other income and expenses, net — (4) Interest expense 2 31 (Gain) Loss on disposal (10) 220 Loss before income taxes (2) (274) Income tax expense (benefit) 1 (65) Loss from discontinued operations $ (3) $ (209) Add: Net loss attributable to noncontrolling interest included in discontinued operations — 64 Net loss from discontinued operations attributable to Duke Energy Corporation $ (3) $ (145) Three Months Ended March 31, (in millions) 2024 2023 Cash flows used in: Operating activities $ (3) $ (54) Investing activities — (151)

Business Segments (Tables)

Business Segments (Tables)	3 Months Ended
	Mar. 31, 2024
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 March 31, 2024 Electric Gas Total Utilities and Utilities and Reportable (in millions) Infrastructure Infrastructure Segments Other Eliminations Total Unaffiliated revenues $ 6,785 $ 879 $ 7,664 $ 7 $ — $ 7,671 Intersegment revenues 18 23 41 31 (72) — Total revenues $ 6,803 $ 902 $ 7,705 $ 38 $ (72) $ 7,671 Segment income (loss) $ 1,021 $ 284 $ 1,305 $ (203) $ — $ 1,102 Less: Noncontrolling interests (13) Add: Preferred stock dividend 39 Discontinued operations (3) Net Income $ 1,151 Segment assets (a) $ 156,606 $ 17,464 $ 174,070 $ 4,600 $ — $ 178,670 Three Months Ended March 31, 2023 Electric Gas Total Utilities and Utilities and Reportable (in millions) Infrastructure Infrastructure Segments Other Eliminations Total Unaffiliated revenues $ 6,381 $ 888 $ 7,269 $ 7 $ — $ 7,276 Intersegment revenues 17 23 40 24 (64) — Total revenues $ 6,398 $ 911 $ 7,309 $ 31 $ (64) $ 7,276 Segment income (loss) $ 791 $ 287 $ 1,078 $ (168) $ — $ 910 Less: Noncontrolling interests 43 Add: Preferred stock dividend 39 Discontinued operations (145) Net Income $ 761 (a) Other includes Assets Held for Sale balances related to the Commercial Renewables Disposal Groups. Refer to Note 2 for further information.
Duke Energy Ohio
Segment Reporting Information [Line Items]
Business Segment Data	Three Months Ended March 31, 2024 Electric Gas Total Utilities and Utilities and Reportable (in millions) Infrastructure Infrastructure Segments Other Eliminations Total Total revenues $ 458 $ 220 $ 678 $ — $ — $ 678 Segment income (loss)/Net income $ 55 $ 41 $ 96 $ (2) $ — $ 94 Segment assets $ 7,935 $ 4,350 $ 12,285 $ 13 $ 7 $ 12,305 Three Months Ended March 31, 2023 Electric Gas Total Utilities and Utilities and Reportable (in millions) Infrastructure Infrastructure Segments Other Total Total revenues $ 474 $ 235 $ 709 $ — $ 709 Segment income (loss)/Net income $ 49 $ 52 $ 101 $ (1) $ 100

Commitments and Contingencies (

Commitments and Contingencies (Tables)	3 Months Ended
	Mar. 31, 2024
Commitments and Contingencies Disclosure [Abstract]
Schedule of Reserves	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 Other Current Liabilities and Other within Other Noncurrent Liabilities on the Condensed Consolidated Balance Sheets. (in millions) March 31, 2024 December 31, 2023 Reserves for Environmental Remediation Duke Energy $ 86 $ 88 Duke Energy Carolinas 23 23 Progress Energy 19 19 Duke Energy Progress 9 9 Duke Energy Florida 10 10 Duke Energy Ohio 34 36 Duke Energy Indiana 2 2 Piedmont 7 7

Debt and Credit Facilities (Tab

Debt and Credit Facilities (Tables)	3 Months Ended
	Mar. 31, 2024
Debt Disclosure [Abstract]
Schedule of Long-term Debt Instruments	The following table summarizes significant debt issuances (in millions). Three Months Ended March 31, 2024 Duke Duke Duke Duke Duke Maturity Interest Duke Energy Energy Energy Energy Energy Issuance Date Date Rate Energy (Parent) Carolinas Progress Ohio Indiana Unsecured Debt January 2024 (a) January 2027 4.85 % $ 600 $ 600 $ — $ — $ — $ — January 2024 (a) January 2029 4.85 % 650 650 — — — — First Mortgage Bonds January 2024 (b) January 2034 4.85 % $ 575 $ — $ 575 $ — $ — $ — January 2024 (b) January 2054 5.40 % 425 — 425 — — — March 2024 (b) March 2034 5.25 % 300 — — — — 300 March 2024 (c) March 2034 5.10 % 500 — — 500 — — March 2024 (d) March 2054 5.55 % 425 — — — 425 — Total issuances $ 3,475 $ 1,250 $ 1,000 $ 500 $ 425 $ 300 (a) Proceeds were used to repay the remaining $1 billion outstanding on Duke Energy (Parent)'s variable rate Term Loan Facility due March 2024, pay down a portion of short-term debt and for general corporate purposes. Duke Energy (Parent)'s Term Loan Facility was terminated in March 2024 in conjunction with the payoff of remaining borrowings. (b) Proceeds were used to pay down a portion of short-term debt and for general company purposes. (c) Proceeds were used to fund eligible green energy projects, pay down a portion of short-term debt and for general company purposes. (d) Proceeds were used to pay down a portion of short-term debt 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 March 31, 2024 Unsecured Debt Duke Energy (Parent) April 2024 3.750 % $ 1,000 Secured Debt Duke Energy Florida (a) April 2024 6.395 % 163 Duke Energy Florida (a) April 2024 6.226 % 162 Duke Energy Carolinas (a) January 2025 6.176 % 500 First Mortgage Bonds Duke Energy Florida (b) October 2073 4.922 % 200 Other (c) 249 Current maturities of long-term debt $ 2,274 (a) Debt has a floating interest rate. In April 2024, Duke Energy Florida repaid the $325 million in total borrowings outstanding under the DEFR accounts receivable securitization facility maturing in April 2024 and terminated the facility. See Note 12 for additional information. (b) While final maturity is October 2073, these first mortgage bonds are classified as Current maturities of long-term debt on the Consolidated Balance Sheets, based on terms of the indenture, which could require repayment in less than 12 months if exercised by the bondholders. (c) Includes finance lease obligations, amortizing debt, tax-exempt bonds with mandatory put options 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. March 31, 2024 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) $ 9,000 $ 2,275 $ 1,400 $ 1,575 $ 950 $ 1,050 $ 950 $ 800 Reduction to backstop issuances Commercial paper (b) (3,759) (1,309) (355) (904) (66) (331) (286) (508) Outstanding letters of credit (38) (26) (4) (1) (7) — — — Tax-exempt bonds (81) — — — — — (81) — Available capacity under the Master Credit Facility $ 5,122 $ 940 $ 1,041 $ 670 $ 877 $ 719 $ 583 $ 292 (a) Represents the sublimit of each borrower. (b)

Related Party Transactions (Tab

Related Party Transactions (Tables)	3 Months Ended
	Mar. 31, 2024
Related Party Transactions [Abstract]
Schedule of Related Party Transactions, Other Revenue and Expense	Transactions with related parties included on the Condensed Consolidated Statements of Operations and Comprehensive Income are presented in the following table. Three Months Ended March 31, (in millions) 2024 2023 Duke Energy Carolinas Corporate governance and shared service expenses (a) $ 214 $ 196 Indemnification coverages (b) 11 9 JDA revenue (c) 16 13 JDA expense (c) 40 29 Intercompany natural gas purchases (d) 4 5 Progress Energy Corporate governance and shared service expenses (a) $ 188 $ 178 Indemnification coverages (b) 14 12 JDA revenue (c) 40 29 JDA expense (c) 16 13 Intercompany natural gas purchases (d) 19 19 Duke Energy Progress Corporate governance and shared service expenses (a) $ 114 $ 107 Indemnification coverages (b) 6 5 JDA revenue (c) 40 29 JDA expense (c) 16 13 Intercompany natural gas purchases (d) 19 19 Duke Energy Florida Corporate governance and shared service expenses (a) $ 74 $ 71 Indemnification coverages (b) 8 7 Duke Energy Ohio Corporate governance and shared service expenses (a) $ 77 $ 73 Indemnification coverages (b) 2 1 Duke Energy Indiana Corporate governance and shared service expenses (a) $ 102 $ 99 Indemnification coverages (b) 2 2 Piedmont Corporate governance and shared service expenses (a) $ 41 $ 38 Indemnification coverages (b) 1 1 Intercompany natural gas sales (d) 23 24 Natural gas storage and transportation costs (e) 6 6 (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 and Impairment of assets and other charges 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 March 31, 2024 Intercompany income tax receivable $ — $ — $ — $ — $ — $ 9 $ — Intercompany income tax payable 39 30 69 31 15 — 76 December 31, 2023 Intercompany income tax receivable $ — $ — $ — $ — $ 91 $ 53 $ — Intercompany income tax payable 81 92 94 114 — — 57

Derivatives and Hedging (Tables

Derivatives and Hedging (Tables)	3 Months Ended
	Mar. 31, 2024
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Notional Amounts of Outstanding Derivative Positions	The following tables show notional amounts of outstanding derivatives related to interest rate risk. March 31, 2024 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Indiana Ohio Cash flow hedges $ 2,550 $ — $ — $ — $ — $ — $ — Undesignated contracts 2,402 850 1,325 875 450 200 27 Total notional amount $ 4,952 $ 850 $ 1,325 $ 875 $ 450 $ 200 $ 27 December 31, 2023 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Indiana Ohio Cash flow hedges $ 2,300 $ — $ — $ — $ — $ — $ — Undesignated contracts 2,727 1,050 1,250 925 325 400 27 Total notional amount $ 5,027 $ 1,050 $ 1,250 $ 925 $ 325 $ 400 $ 27 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. March 31, 2024 Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy Carolinas Energy Progress Ohio Indiana Piedmont Electricity (GWh) 4,981 — — — 669 4,312 — Natural gas (millions of dekatherms) 813 266 259 259 — 35 253 December 31, 2023 Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy Carolinas Energy Progress Ohio Indiana Piedmont Electricity (GWh) 13,608 — — — 1,616 11,992 — Natural gas (millions of dekatherms) 846 279 274 274 — 30 263 The following table shows Duke Energy's outstanding derivatives related to foreign currency risk at March 31, 2024. Fair Value Gain (Loss) (a) (in millions) Pay Notional Receive Notional Receive Hedge Three Months Ended March 31, (in millions) Pay Rate (in millions) Rate Maturity Date 2024 2023 Fair value hedges $ 645 4.75 % 600 euros 3.10 % June 2028 $ 2 $ 5 537 5.31 % 500 euros 3.85 % June 2034 2 5 Total notional amount $ 1,182 1,100 euros $ 4 $ 10
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 March 31, 2024 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 $ 21 $ 1 $ 11 $ 1 $ 10 $ — $ 7 $ 1 Noncurrent 54 25 29 29 — — — — Total Derivative Assets – Commodity Contracts $ 75 $ 26 $ 40 $ 30 $ 10 $ — $ 7 $ 1 Interest Rate Contracts Designated as Hedging Instruments Current $ 74 $ — $ — $ — $ — $ — $ — $ — Noncurrent 40 — — — — — — — Not Designated as Hedging Instruments Noncurrent 43 9 17 17 — — 17 — Total Derivative Assets – Interest Rate Contracts $ 157 $ 9 $ 17 $ 17 $ — $ — $ 17 $ — Foreign Currency Contracts Designated as Hedging Instruments Noncurrent $ 23 $ — $ — $ — $ — $ — $ — $ — Total Derivative Assets – Foreign Currency Contracts $ 23 $ — $ — $ — $ — $ — $ — $ — Total Derivative Assets $ 255 $ 35 $ 57 $ 47 $ 10 $ — $ 24 $ 1 Derivative Liabilities March 31, 2024 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 $ 335 $ 175 $ 126 $ 126 $ — $ — $ 19 $ 14 Noncurrent 213 53 48 48 — — — 112 Total Derivative Liabilities – Commodity Contracts $ 548 $ 228 $ 174 $ 174 $ — $ — $ 19 $ 126 Interest Rate Contracts Designated as Hedging Instruments Current $ 14 $ — $ — $ — $ — $ — $ — $ — Noncurrent 11 — — — — — — — Not Designated as Hedging Instruments Noncurrent 21 6 14 7 7 1 — — Total Derivative Liabilities – Interest Rate Contracts $ 46 $ 6 $ 14 $ 7 $ 7 $ 1 $ — $ — Foreign Currency Contracts Designated as Hedging Instruments Current $ 18 $ — $ — $ — $ — $ — $ — $ — Total Derivative Liabilities – Foreign Currency Contracts $ 18 $ — $ — $ — $ — $ — $ — $ — Total Derivative Liabilities $ 612 $ 234 $ 188 $ 181 $ 7 $ 1 $ 19 $ 126 Derivative Assets December 31, 2023 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 $ 25 $ 1 $ 3 $ 1 $ 2 $ 1 $ 18 $ 1 Noncurrent 57 26 31 31 — — — — Total Derivative Assets – Commodity Contracts $ 82 $ 27 $ 34 $ 32 $ 2 $ 1 $ 18 $ 1 Interest Rate Contracts Designated as Hedging Instruments Current $ 31 $ — $ — $ — $ — $ — $ — $ — Noncurrent 17 — — — — — — — Not Designated as Hedging Instruments Current $ 5 $ 5 $ — $ — $ — $ — $ — $ — Noncurrent 10 3 — — — — 7 — Total Derivative Assets – Interest Rate Contracts $ 63 $ 8 $ — $ — $ — $ — $ 7 $ — Foreign Currency Contracts Designated as Hedging Instruments Noncurrent $ 44 $ — $ — $ — $ — $ — $ — $ — Total Derivative Assets – Foreign Currency Contracts $ 44 $ — $ — $ — $ — $ — $ — $ — Total Derivative Assets $ 189 $ 35 $ 34 $ 32 $ 2 $ 1 $ 25 $ 1 Derivative Liabilities December 31, 2023 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 $ 354 $ 177 $ 138 $ 138 $ — $ — $ 18 $ 20 Noncurrent 255 67 61 61 — — — 127 Total Derivative Liabilities – Commodity Contracts $ 609 $ 244 $ 199 $ 199 $ — $ — $ 18 $ 147 Interest Rate Contracts Designated as Hedging Instruments Current $ 25 $ — $ — $ — $ — $ — $ — $ — Noncurrent 26 — — — — — — — Not Designated as Hedging Instruments Current $ 13 $ 2 $ 11 $ 11 $ — $ — $ — $ — Noncurrent 39 14 24 9 15 1 — — Total Derivative Liabilities – Interest Rate Contracts $ 103 $ 16 $ 35 $ 20 $ 15 $ 1 $ — $ — Foreign Currency Contracts Designated as Hedging Instruments Current $ 17 $ — $ — $ — $ — $ — $ — $ — Total Derivative Liabilities – Foreign Currency Contracts $ 17 $ — $ — $ — $ — $ — $ — $ — Total Derivative Liabilities $ 729 $ 260 $ 234 $ 219 $ 15 $ 1 $ 18 $ 147
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 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 March 31, 2024 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 $ 95 $ 1 $ 11 $ 1 $ 10 $ — $ 7 $ 1 Offset (1) (1) (1) (1) — — — — Net amounts presented in Current Assets: Other $ 94 $ — $ 10 $ — $ 10 $ — $ 7 $ 1 Noncurrent Gross amounts recognized $ 160 $ 34 $ 46 $ 46 $ — $ — $ 17 $ — Offset (31) (11) (20) (20) — — — — Net amounts presented in Other Noncurrent Assets: Other $ 129 $ 23 $ 26 $ 26 $ — $ — $ 17 $ — Derivative Liabilities March 31, 2024 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 $ 367 $ 175 $ 126 $ 126 $ — $ — $ 19 $ 14 Offset (1) (1) (1) (1) — — — — Cash collateral posted (85) (39) (26) (26) — — (19) — Net amounts presented in Current Liabilities: Other $ 281 $ 135 $ 99 $ 99 $ — $ — $ — $ 14 Noncurrent Gross amounts recognized $ 245 $ 59 $ 62 $ 55 $ 7 $ 1 $ — $ 112 Offset (31) (11) (20) (20) — — — — Cash collateral posted $ (52) $ (30) $ (21) $ (21) $ — $ — $ — $ — Net amounts presented in Other Noncurrent Liabilities: Other $ 162 $ 18 $ 21 $ 14 $ 7 $ 1 $ — $ 112 Derivative Assets December 31, 2023 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 $ 61 $ 6 $ 3 $ 1 $ 2 $ 1 $ 18 $ 1 Offset (2) (1) (1) (1) — — — — Net amounts presented in Current Assets: Other $ 59 $ 5 $ 2 $ — $ 2 $ 1 $ 18 $ 1 Noncurrent Gross amounts recognized $ 128 $ 29 $ 31 $ 31 $ — $ — $ 7 $ — Offset (37) (14) (22) (22) — — — — Net amounts presented in Other Noncurrent Assets: Other $ 91 $ 15 $ 9 $ 9 $ — $ — $ 7 $ — Derivative Liabilities December 31, 2023 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 $ 409 $ 179 $ 149 $ 149 $ — $ — $ 18 $ 20 Offset (2) (1) (1) (1) — — — — Cash collateral posted (96) (48) (30) (30) — — (18) — Net amounts presented in Current Liabilities: Other $ 311 $ 130 $ 118 $ 118 $ — $ — $ — $ 20 Noncurrent Gross amounts recognized $ 320 $ 81 $ 85 $ 70 $ 15 $ 1 $ — $ 127 Offset (37) (14) (22) (22) — — — — Cash collateral posted (66) (38) (28) (28) — — — — Net amounts presented in Other Noncurrent Liabilities: Other $ 217 $ 29 $ 35 $ 20 $ 15 $ 1 $ — $ 127
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 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 March 31, 2024 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 $ 95 $ 1 $ 11 $ 1 $ 10 $ — $ 7 $ 1 Offset (1) (1) (1) (1) — — — — Net amounts presented in Current Assets: Other $ 94 $ — $ 10 $ — $ 10 $ — $ 7 $ 1 Noncurrent Gross amounts recognized $ 160 $ 34 $ 46 $ 46 $ — $ — $ 17 $ — Offset (31) (11) (20) (20) — — — — Net amounts presented in Other Noncurrent Assets: Other $ 129 $ 23 $ 26 $ 26 $ — $ — $ 17 $ — Derivative Liabilities March 31, 2024 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 $ 367 $ 175 $ 126 $ 126 $ — $ — $ 19 $ 14 Offset (1) (1) (1) (1) — — — — Cash collateral posted (85) (39) (26) (26) — — (19) — Net amounts presented in Current Liabilities: Other $ 281 $ 135 $ 99 $ 99 $ — $ — $ — $ 14 Noncurrent Gross amounts recognized $ 245 $ 59 $ 62 $ 55 $ 7 $ 1 $ — $ 112 Offset (31) (11) (20) (20) — — — — Cash collateral posted $ (52) $ (30) $ (21) $ (21) $ — $ — $ — $ — Net amounts presented in Other Noncurrent Liabilities: Other $ 162 $ 18 $ 21 $ 14 $ 7 $ 1 $ — $ 112 Derivative Assets December 31, 2023 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 $ 61 $ 6 $ 3 $ 1 $ 2 $ 1 $ 18 $ 1 Offset (2) (1) (1) (1) — — — — Net amounts presented in Current Assets: Other $ 59 $ 5 $ 2 $ — $ 2 $ 1 $ 18 $ 1 Noncurrent Gross amounts recognized $ 128 $ 29 $ 31 $ 31 $ — $ — $ 7 $ — Offset (37) (14) (22) (22) — — — — Net amounts presented in Other Noncurrent Assets: Other $ 91 $ 15 $ 9 $ 9 $ — $ — $ 7 $ — Derivative Liabilities December 31, 2023 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 $ 409 $ 179 $ 149 $ 149 $ — $ — $ 18 $ 20 Offset (2) (1) (1) (1) — — — — Cash collateral posted (96) (48) (30) (30) — — (18) — Net amounts presented in Current Liabilities: Other $ 311 $ 130 $ 118 $ 118 $ — $ — $ — $ 20 Noncurrent Gross amounts recognized $ 320 $ 81 $ 85 $ 70 $ 15 $ 1 $ — $ 127 Offset (37) (14) (22) (22) — — — — Cash collateral posted (66) (38) (28) (28) — — — — Net amounts presented in Other Noncurrent Liabilities: Other $ 217 $ 29 $ 35 $ 20 $ 15 $ 1 $ — $ 127
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. March 31, 2024 Duke Duke Duke Energy Progress Energy (in millions) Energy Carolinas Energy Progress Aggregate fair value of derivatives in a net liability position $ 314 $ 167 $ 147 $ 147 Fair value of collateral already posted 117 70 48 48 Additional cash collateral or letters of credit in the event credit risk-related contingent features were triggered $ 197 $ 97 $ 99 $ 99 December 31, 2023 Duke Duke Duke Energy Progress Energy (in millions) Energy Carolinas Energy Progress Aggregate fair value of derivatives in a net liability position $ 342 $ 175 $ 166 $ 166 Fair value of collateral already posted 144 86 58 58 Additional cash collateral or letters of credit in the event credit risk-related contingent features were triggered $ 198 $ 89 $ 108 $ 108

Investments in Debt and Equit_2

Investments in Debt and Equity Securities (Tables)	3 Months Ended
	Mar. 31, 2024
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. March 31, 2024 December 31, 2023 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 $ — $ — $ 140 $ — $ — $ 133 Equity securities 5,553 27 7,837 4,942 22 7,278 Corporate debt securities 8 46 659 12 43 632 Municipal bonds 4 16 332 6 16 347 U.S. government bonds 9 76 1,610 24 65 1,575 Other debt securities — 13 209 1 13 178 Total NDTF Investments $ 5,574 $ 178 $ 10,787 $ 4,985 $ 159 $ 10,143 Other Investments Cash and cash equivalents $ — $ — $ 21 $ — $ — $ 31 Equity securities 47 — 173 33 — 158 Corporate debt securities — 6 87 — 6 82 Municipal bonds — 1 79 1 2 77 U.S. government bonds — 3 60 — 2 65 Other debt securities — 3 45 — 2 47 Total Other Investments $ 47 $ 13 $ 465 $ 34 $ 12 $ 460 Total Investments $ 5,621 $ 191 $ 11,252 $ 5,019 $ 171 $ 10,603
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. March 31, 2024 December 31, 2023 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 $ — $ — $ 140 $ — $ — $ 133 Equity securities 5,553 27 7,837 4,942 22 7,278 Corporate debt securities 8 46 659 12 43 632 Municipal bonds 4 16 332 6 16 347 U.S. government bonds 9 76 1,610 24 65 1,575 Other debt securities — 13 209 1 13 178 Total NDTF Investments $ 5,574 $ 178 $ 10,787 $ 4,985 $ 159 $ 10,143 Other Investments Cash and cash equivalents $ — $ — $ 21 $ — $ — $ 31 Equity securities 47 — 173 33 — 158 Corporate debt securities — 6 87 — 6 82 Municipal bonds — 1 79 1 2 77 U.S. government bonds — 3 60 — 2 65 Other debt securities — 3 45 — 2 47 Total Other Investments $ 47 $ 13 $ 465 $ 34 $ 12 $ 460 Total Investments $ 5,621 $ 191 $ 11,252 $ 5,019 $ 171 $ 10,603
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 months ended March 31, 2024, and 2023, were as follows. Three Months Ended (in millions) March 31, 2024 March 31, 2023 FV-NI: Realized gains $ 68 $ 26 Realized losses 18 46 AFS: Realized gains 10 8 Realized losses 14 32
Investments Classified by Contractual Maturity Date	The table below summarizes the maturity date for debt securities. March 31, 2024 Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Indiana Due in one year or less $ 126 $ 10 $ 101 $ 23 $ 78 $ 9 Due after one through five years 715 245 389 264 125 18 Due after five through 10 years 614 359 206 192 14 11 Due after 10 years 1,626 866 658 618 40 25 Total $ 3,081 $ 1,480 $ 1,354 $ 1,097 $ 257 $ 63
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. March 31, 2024 December 31, 2023 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 $ — $ — $ 81 $ — $ — $ 51 Equity securities 3,226 19 4,514 2,886 14 4,196 Corporate debt securities 2 37 397 4 35 390 Municipal bonds — 4 38 — 4 50 U.S. government bonds 4 41 854 13 33 826 Other debt securities — 13 191 1 13 172 Total NDTF Investments $ 3,232 $ 114 $ 6,075 $ 2,904 $ 99 $ 5,685
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. March 31, 2024 December 31, 2023 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 $ — $ — $ 81 $ — $ — $ 51 Equity securities 3,226 19 4,514 2,886 14 4,196 Corporate debt securities 2 37 397 4 35 390 Municipal bonds — 4 38 — 4 50 U.S. government bonds 4 41 854 13 33 826 Other debt securities — 13 191 1 13 172 Total NDTF Investments $ 3,232 $ 114 $ 6,075 $ 2,904 $ 99 $ 5,685
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 months ended March 31, 2024, and 2023, were as follows. Three Months Ended (in millions) March 31, 2024 March 31, 2023 FV-NI: Realized gains $ 53 $ 18 Realized losses 6 29 AFS: Realized gains 4 5 Realized losses 6 20
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. March 31, 2024 December 31, 2023 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 $ — $ — $ 59 $ — $ — $ 82 Equity securities 2,327 8 3,323 2,056 8 3,082 Corporate debt securities 6 9 262 8 8 242 Municipal bonds 4 12 294 6 12 297 U.S. government bonds 5 35 756 11 32 749 Other debt securities — — 18 — — 6 Total NDTF Investments $ 2,342 $ 64 $ 4,712 $ 2,081 $ 60 $ 4,458 Other Investments Cash and cash equivalents $ — $ — $ 15 $ — $ — $ 18 Municipal bonds — — 24 — 1 23 Total Other Investments $ — $ — $ 39 $ — $ 1 $ 41 Total Investments $ 2,342 $ 64 $ 4,751 $ 2,081 $ 61 $ 4,499
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. March 31, 2024 December 31, 2023 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 $ — $ — $ 59 $ — $ — $ 82 Equity securities 2,327 8 3,323 2,056 8 3,082 Corporate debt securities 6 9 262 8 8 242 Municipal bonds 4 12 294 6 12 297 U.S. government bonds 5 35 756 11 32 749 Other debt securities — — 18 — — 6 Total NDTF Investments $ 2,342 $ 64 $ 4,712 $ 2,081 $ 60 $ 4,458 Other Investments Cash and cash equivalents $ — $ — $ 15 $ — $ — $ 18 Municipal bonds — — 24 — 1 23 Total Other Investments $ — $ — $ 39 $ — $ 1 $ 41 Total Investments $ 2,342 $ 64 $ 4,751 $ 2,081 $ 61 $ 4,499
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 months ended March 31, 2024, and 2023, were as follows. Three Months Ended (in millions) March 31, 2024 March 31, 2023 FV-NI: Realized gains $ 15 $ 8 Realized losses 12 17 AFS: Realized gains 6 3 Realized losses 8 12
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. March 31, 2024 December 31, 2023 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 $ — $ — $ 48 $ — $ — $ 55 Equity securities 2,216 8 3,200 1,956 8 2,970 Corporate debt securities 5 9 248 7 8 229 Municipal bonds 4 12 294 6 12 297 U.S. government bonds 5 22 539 10 18 518 Other debt securities — — 16 — — 6 Total NDTF Investments $ 2,230 $ 51 $ 4,345 $ 1,979 $ 46 $ 4,075 Other Investments Cash and cash equivalents $ — $ — $ 12 $ — $ — $ 14 Total Other Investments $ — $ — $ 12 $ — $ — $ 14 Total Investments $ 2,230 $ 51 $ 4,357 $ 1,979 $ 46 $ 4,089
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. March 31, 2024 December 31, 2023 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 $ — $ — $ 48 $ — $ — $ 55 Equity securities 2,216 8 3,200 1,956 8 2,970 Corporate debt securities 5 9 248 7 8 229 Municipal bonds 4 12 294 6 12 297 U.S. government bonds 5 22 539 10 18 518 Other debt securities — — 16 — — 6 Total NDTF Investments $ 2,230 $ 51 $ 4,345 $ 1,979 $ 46 $ 4,075 Other Investments Cash and cash equivalents $ — $ — $ 12 $ — $ — $ 14 Total Other Investments $ — $ — $ 12 $ — $ — $ 14 Total Investments $ 2,230 $ 51 $ 4,357 $ 1,979 $ 46 $ 4,089
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 months ended March 31, 2024, and 2023, were as follows. Three Months Ended (in millions) March 31, 2024 March 31, 2023 FV-NI: Realized gains $ 15 $ 8 Realized losses 12 17 AFS: Realized gains 6 3 Realized losses 8 12
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. March 31, 2024 December 31, 2023 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 $ — $ — $ 11 $ — $ — $ 27 Equity securities 111 — 123 100 — 112 Corporate debt securities 1 — 14 1 — 13 U.S. government bonds — 13 217 1 14 231 Other debt securities — — 2 — — — Total NDTF Investments (a) $ 112 $ 13 $ 367 $ 102 $ 14 $ 383 Other Investments Cash and cash equivalents $ — $ — $ 2 $ — $ — $ 3 Municipal bonds — — 24 — 1 23 Total Other Investments $ — $ — $ 26 $ — $ 1 $ 26 Total Investments $ 112 $ 13 $ 393 $ 102 $ 15 $ 409 (a) During the three months ended March 31, 2024, and the year ended December 31, 2023, Duke Energy Florida received 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. March 31, 2024 December 31, 2023 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 $ — $ — $ 11 $ — $ — $ 27 Equity securities 111 — 123 100 — 112 Corporate debt securities 1 — 14 1 — 13 U.S. government bonds — 13 217 1 14 231 Other debt securities — — 2 — — — Total NDTF Investments (a) $ 112 $ 13 $ 367 $ 102 $ 14 $ 383 Other Investments Cash and cash equivalents $ — $ — $ 2 $ — $ — $ 3 Municipal bonds — — 24 — 1 23 Total Other Investments $ — $ — $ 26 $ — $ 1 $ 26 Total Investments $ 112 $ 13 $ 393 $ 102 $ 15 $ 409 (a) During the three months ended March 31, 2024, and the year ended December 31, 2023, Duke Energy Florida received reimbursements from the NDTF for costs related to ongoing decommissioning activity of Crystal River Unit 3.
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. March 31, 2024 December 31, 2023 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 $ — $ — $ 1 Equity securities 13 — 108 4 — 98 Corporate debt securities — — 8 — — 8 Municipal bonds — 1 45 1 1 46 U.S. government bonds — — 10 — — 10 Total Investments $ 13 $ 1 $ 172 $ 5 $ 1 $ 163
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. March 31, 2024 December 31, 2023 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 $ — $ — $ 1 Equity securities 13 — 108 4 — 98 Corporate debt securities — — 8 — — 8 Municipal bonds — 1 45 1 1 46 U.S. government bonds — — 10 — — 10 Total Investments $ 13 $ 1 $ 172 $ 5 $ 1 $ 163

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	3 Months Ended
	Mar. 31, 2024
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. March 31, 2024 (in millions) Total Fair Value Level 1 Level 2 Level 3 Not Categorized NDTF cash and cash equivalents $ 140 $ 140 $ — $ — $ — NDTF equity securities 7,837 7,802 — — 35 NDTF debt securities 2,810 873 1,937 — — Other equity securities 173 173 — — — Other debt securities 271 50 221 — — Other cash and cash equivalents 21 21 — — — Derivative assets 255 77 172 6 — Total assets 11,507 9,136 2,330 6 35 Derivative liabilities (612) (51) (561) — — Net assets $ 10,895 $ 9,085 $ 1,769 $ 6 $ 35 December 31, 2023 (in millions) Total Fair Value Level 1 Level 2 Level 3 Not Categorized NDTF cash and cash equivalents $ 133 $ 133 $ — $ — $ — NDTF equity securities 7,278 7,241 — — 37 NDTF debt securities 2,732 829 1,903 — — Other equity securities 158 158 — — — Other debt securities 271 55 216 — — Other cash and cash equivalents 31 31 — — — Derivative assets 189 37 137 15 — Total assets 10,792 8,484 2,256 15 37 Derivative liabilities (729) (60) (669) — — Net assets $ 10,063 $ 8,424 $ 1,587 $ 15 $ 37
Reconciliation of Assets and Liabilities Measured At Fair Value on a Recurring Basis Using Unobservable Inputs	The following table provides reconciliations of beginning and ending balances of assets and liabilities measured at fair value using Level 3 measurements. Derivatives (net) Three Months Ended March 31, (in millions) 2024 2023 Balance at beginning of period $ 15 $ 34 Purchases, sales, issuances and settlements: Settlements (13) (20) Total gains (losses) included on the Condensed Consolidated Balance Sheet 4 (2) Balance at end of period $ 6 $ 12
Quantitative Information Table - Level 3	The following tables include quantitative information about the Duke Energy Registrants' derivatives classified as Level 3. March 31, 2024 Weighted Fair Value Average Investment Type (in millions) Valuation Technique Unobservable Input Range Range Duke Energy Ohio FTRs $ 1 RTO auction pricing FTR price – per MWh $ 0.17 - $ 2.13 $ 0.49 Duke Energy Indiana FTRs 5 RTO auction pricing FTR price – per MWh — - 8.95 1.45 Duke Energy Total Level 3 derivatives $ 6 December 31, 2023 Weighted Fair Value Average Investment Type (in millions) Valuation Technique Unobservable Input Range Range Duke Energy Ohio FTRs $ 2 RTO auction pricing FTR price – per MWh $ 0.36 - $ 2.11 $ 0.71 Duke Energy Indiana FTRs 13 RTO auction pricing FTR price – per MWh (1.05) - 9.64 1.26 Duke Energy Total Level 3 derivatives $ 15
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. March 31, 2024 December 31, 2023 (in millions) Book Value Fair Value Book Value Fair Value Duke Energy (a) $ 77,253 $ 70,512 $ 75,252 $ 69,790 Duke Energy Carolinas 17,019 15,723 16,012 15,077 Progress Energy 24,198 22,505 23,759 22,553 Duke Energy Progress 12,178 10,824 11,714 10,595 Duke Energy Florida 10,377 9,888 10,401 10,123 Duke Energy Ohio 3,939 3,685 3,518 3,310 Duke Energy Indiana 4,800 4,437 4,502 4,230 Piedmont 3,669 3,273 3,668 3,336 (a) Book value of long-term debt inc ludes $1.1 billion and $1.0 billion
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. March 31, 2024 (in millions) Total Fair Value Level 1 Level 2 Not Categorized NDTF cash and cash equivalents $ 81 $ 81 $ — $ — NDTF equity securities 4,514 4,479 — 35 NDTF debt securities 1,480 418 1,062 — Other AFS debt securities — — — — Derivative assets 35 — 35 — Total assets 6,110 4,978 1,097 35 Derivative liabilities (234) — (234) — Net assets $ 5,876 $ 4,978 $ 863 $ 35 December 31, 2023 (in millions) Total Fair Value Level 1 Level 2 Not Categorized NDTF cash and cash equivalents $ 51 $ 51 $ — $ — NDTF equity securities 4,196 4,159 — 37 NDTF debt securities 1,438 375 1,063 — Derivative assets 35 — 35 — Total assets 5,720 4,585 1,098 37 Derivative liabilities (260) — (260) — Net assets $ 5,460 $ 4,585 $ 838 $ 37
Progress Energy
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Measurement amounts for Assets and Liabilities	The following table provides recorded balances for assets and liabilities measured at fair value on a recurring basis on the Condensed Consolidated Balance Sheets. March 31, 2024 December 31, 2023 (in millions) Total Fair Value Level 1 Level 2 Total Fair Value Level 1 Level 2 NDTF cash and cash equivalents $ 59 $ 59 $ — $ 82 $ 82 $ — NDTF equity securities 3,323 3,323 — 3,082 3,082 — NDTF debt securities 1,330 455 875 1,294 454 840 Other debt securities 24 — 24 23 — 23 Other cash and cash equivalents 15 15 — 18 18 — Derivative assets 57 — 57 34 — 34 Total assets 4,808 3,852 956 4,533 3,636 897 Derivative liabilities (188) — (188) (234) — (234) Net assets $ 4,620 $ 3,852 $ 768 $ 4,299 $ 3,636 $ 663
Duke Energy Progress
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Measurement amounts for Assets and Liabilities	The following table provides recorded balances for assets and liabilities measured at fair value on a recurring basis on the Condensed Consolidated Balance Sheets. March 31, 2024 December 31, 2023 (in millions) Total Fair Value Level 1 Level 2 Total Fair Value Level 1 Level 2 NDTF cash and cash equivalents $ 48 $ 48 $ — $ 55 $ 55 $ — NDTF equity securities 3,200 3,200 — 2,970 2,970 — NDTF debt securities 1,097 280 817 1,050 266 784 Other cash and cash equivalents 12 12 — 14 14 — Derivative assets 47 — 47 32 — 32 Total assets 4,404 3,540 864 4,121 3,305 816 Derivative liabilities (181) — (181) (219) — (219) Net assets $ 4,223 $ 3,540 $ 683 $ 3,902 $ 3,305 $ 597
Duke Energy Florida
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Measurement amounts for Assets and Liabilities	The following table provides recorded balances for assets and liabilities measured at fair value on a recurring basis on the Condensed Consolidated Balance Sheets. March 31, 2024 December 31, 2023 (in millions) Total Fair Value Level 1 Level 2 Total Fair Value Level 1 Level 2 NDTF cash and cash equivalents $ 11 $ 11 $ — $ 27 $ 27 $ — NDTF equity securities 123 123 — 112 112 — NDTF debt securities 233 175 58 244 188 56 Other debt securities 24 — 24 23 — 23 Other cash and cash equivalents 2 2 — 3 3 — Derivative assets 10 — 10 2 — 2 Total assets 403 311 92 411 330 81 Derivative liabilities (7) — (7) (15) — (15) Net assets $ 396 $ 311 $ 85 $ 396 $ 330 $ 66
Duke Energy Indiana
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Measurement amounts for Assets and Liabilities	The following table provides recorded balances for assets and liabilities measured at fair value on a recurring basis on the Condensed Consolidated Balance Sheets. March 31, 2024 December 31, 2023 (in millions) Total Fair Value Level 1 Level 2 Level 3 Total Fair Value Level 1 Level 2 Level 3 Other equity securities $ 108 $ 108 $ — $ — $ 98 $ 98 $ — $ — Other debt securities 63 — 63 — 64 — 64 — Other cash and cash equivalents 1 1 — — 1 1 — — Derivative assets 24 2 17 5 25 5 7 13 Total assets 196 111 80 5 188 104 71 13 Derivative liabilities (19) (19) — — (18) (18) — — Net assets $ 177 $ 92 $ 80 $ 5 $ 170 $ 86 $ 71 $ 13
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 March 31, (in millions) 2024 2023 Balance at beginning of period $ 13 $ 29 Purchases, sales, issuances and settlements: Settlements (11) (19) Total gains included on the Condensed Consolidated Balance Sheet 3 1 Balance at end of period $ 5 $ 11
Piedmont
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Measurement amounts for Assets and Liabilities	The following table provides recorded balances for assets and liabilities measured at fair value on a recurring basis on the Condensed Consolidated Balance Sheets. March 31, 2024 December 31, 2023 (in millions) Total Fair Value Level 1 Level 2 Total Fair Value Level 1 Level 2 Derivative assets $ 1 $ 1 $ — $ 1 $ 1 $ — Derivative liabilities (126) — (126) (147) — (147) Net (liabilities) assets $ (125) $ 1 $ (126) $ (146) $ 1 $ (147)

Variable Interest Entities (Tab

Variable Interest Entities (Tables)	3 Months Ended
	Mar. 31, 2024
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 (a) January 2025 April 2025 (b) Credit facility amount (a) $ 500 $ 400 (b) Amounts borrowed at March 31, 2024 — 500 400 325 Amounts borrowed at December 31, 2023 312 500 400 325 Restricted Receivables at March 31, 2024 — 997 789 467 Restricted Receivables at December 31, 2023 663 991 833 532 (a) In March 2024, Duke Energy repaid all outstanding CRC borrowings and terminated the related $350 million CRC credit facility. (b) In April 2024, Duke Energy Florida repaid all outstanding DEFR borrowings and terminated the related $325 million DEFR credit facility.
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. March 31, 2024 Duke Energy Duke Duke Natural Gas Energy Energy (in millions) Investments Ohio Indiana Receivables from affiliated companies $ — $ — $ — Investments in equity method unconsolidated affiliates 63 — — Other noncurrent assets 30 — — Total assets $ 93 $ — $ — Other current liabilities 1 — — Other noncurrent liabilities 6 — — Total liabilities $ 7 $ — $ — Net assets $ 86 $ — $ — December 31, 2023 Duke Energy Duke Duke Natural Gas Energy Energy (in millions) Investments Ohio Indiana Receivables from affiliated companies $ — $ 150 $ 208 Investments in equity method unconsolidated affiliates 67 — — Other noncurrent assets 43 — — Total assets $ 110 $ 150 $ 208 Other current liabilities 4 — — Other noncurrent liabilities 5 — — Total liabilities $ 9 $ — $ — Net assets $ 101 $ 150 $ 208
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) March 31, 2024 December 31, 2023 Regulatory Assets: Current 59 59 Current Assets: Other 9 37 Other Noncurrent Assets: Regulatory assets 790 803 Current Liabilities: Other 2 8 Current maturities of long-term debt 59 59 Long-Term Debt 800 831
DECNCSF and DEPNCSF | VIE primary beneficiary
Variable Interest Entities [Line Items]
Schedule of Variable Interest Entities	The following table summarizes the impact of these VIEs on Duke Energy Carolinas’ and Duke Energy Progress’ Consolidated Balance Sheets. March 31, 2024 December 31, 2023 Duke Energy Duke Energy Duke Energy Duke Energy (in millions) Carolinas Progress Carolinas Progress Regulatory Assets: Current $ 12 $ 39 $ 12 $ 39 Current Assets: Other 5 18 9 31 Other Noncurrent Assets: Regulatory assets 193 633 196 643 Other Noncurrent Assets: Other 1 4 1 2 Current Liabilities: Other 1 4 10 34 Current maturities of long-term debt 11 34 3 8 Long-Term Debt 203 663 208 680
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) March 31, 2024 December 31, 2023 March 31, 2024 December 31, 2023 Receivables sold $ — $ 361 $ — $ 351 Less: Retained interests — 150 — 208 Net receivables sold $ — $ 211 $ — $ 143 The following table shows sales and cash flows related to receivables sold and reflects CRC activity prior to its termination in March 2024. Duke Energy Ohio Duke Energy Indiana Three Months Ended Three Months Ended March 31, March 31, (in millions) 2024 2023 2024 2023 Sales Receivables sold $ 474 $ 725 $ 473 $ 942 Loss recognized on sale 7 9 6 10 Cash flows Cash proceeds from receivables sold $ 478 $ 750 $ 523 $ 1,028 Return received on retained interests 4 6 4 8
DEF ProCo | VIE primary beneficiary
Variable Interest Entities [Line Items]
Schedule of Variable Interest Entities	The following table summarizes the impact of this VIE on Duke Energy Florida's Consolidated Balance Sheets. (in millions) March 31, 2024 December 31, 2023 Inventory $ 470 $ 462 Accounts Payable 179 188

Revenue (Tables)

Revenue (Tables)	3 Months Ended
	Mar. 31, 2024
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) 2024 2025 2026 2027 2028 Thereafter Total Progress Energy $ 52 $ 30 $ 7 $ 7 $ 7 $ 29 $ 132 Duke Energy Progress 6 — — — — — 6 Duke Energy Florida 46 30 7 7 7 29 126 Duke Energy Indiana 12 17 17 15 5 — 66 Remaining Performance Obligations (in millions) 2024 2025 2026 2027 2028 Thereafter Total Piedmont $ 49 $ 61 $ 51 $ 49 $ 46 $ 195 $ 451
Disaggregation of Revenue	Disaggregated revenues are presented as follows: Three Months Ended March 31, 2024 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 $ 3,115 $ 1,058 $ 1,517 $ 742 $ 775 $ 253 $ 287 $ — General 1,934 717 866 422 444 152 201 — Industrial 822 340 266 177 89 32 183 — Wholesale 554 138 355 326 29 14 48 — Other revenues 253 99 149 78 71 22 34 — Total Electric Utilities and Infrastructure revenue from contracts with customers $ 6,678 $ 2,352 $ 3,153 $ 1,745 $ 1,408 $ 473 $ 753 $ — Gas Utilities and Infrastructure Residential $ 520 $ — $ — $ — $ — $ 147 $ — $ 373 Commercial 240 — — — — 57 — 183 Industrial 47 — — — — 11 — 38 Power Generation — — — — — — — 8 Other revenues 40 — — — — 5 — 35 Total Gas Utilities and Infrastructure revenue from contracts with customers $ 847 $ — $ — $ — $ — $ 220 $ — $ 637 Other Revenue from contracts with customers $ 7 $ — $ — $ — $ — $ — $ — $ — Total revenue from contracts with customers $ 7,532 $ 2,352 $ 3,153 $ 1,745 $ 1,408 $ 693 $ 753 $ 637 Other revenue sources (a) $ 139 $ 55 $ 75 $ 43 $ 28 $ (15) $ 6 $ 39 Total revenues $ 7,671 $ 2,407 $ 3,228 $ 1,788 $ 1,436 $ 678 $ 759 $ 676 Three Months Ended March 31, 2023 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 $ 2,851 $ 824 $ 1,421 $ 607 $ 814 $ 234 $ 372 $ — General 1,831 588 841 358 483 135 270 — Industrial 891 296 272 177 95 71 251 — Wholesale 550 135 348 319 29 9 58 — Other revenues 144 78 121 68 53 27 15 — Total Electric Utilities and Infrastructure revenue from contracts with customers $ 6,267 $ 1,921 $ 3,003 $ 1,529 $ 1,474 $ 476 $ 966 $ — Gas Utilities and Infrastructure Residential $ 507 $ — $ — $ — $ — $ 162 $ — $ 345 Commercial 233 — — — — 58 — 175 Industrial 47 — — — — 9 — 37 Power Generation — — — — — — — 23 Other revenues 40 — — — — 6 — 19 Total Gas Utilities and Infrastructure revenue from contracts with customers $ 827 $ — $ — $ — $ — $ 235 $ — $ 599 Other Revenue from contracts with customers $ 7 $ — $ — $ — $ — $ — $ — $ — Total revenue from contracts with customers $ 7,101 $ 1,921 $ 3,003 $ 1,529 $ 1,474 $ 711 $ 966 $ 599 Other revenue sources (a) $ 175 $ 13 $ 45 $ 4 $ 36 $ (2) $ 9 $ 76 Total revenues $ 7,276 $ 1,934 $ 3,048 $ 1,533 $ 1,510 $ 709 $ 975 $ 675 (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	The following table presents the reserve for credit losses for trade and other receivables. Three Months Ended March 31, 2023 and 2024 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, 2022 $ 216 $ 68 $ 81 $ 44 $ 36 $ 6 $ 4 $ 14 Write-Offs (42) (20) (22) (9) (12) — — (1) Credit Loss Expense 16 7 6 1 5 1 — 1 Other Adjustments 24 15 10 9 1 — — — Balance at March 31, 2023 $ 214 $ 70 $ 75 $ 45 $ 30 $ 7 $ 4 $ 14 Balance at December 31, 2023 $ 205 $ 56 $ 74 $ 44 $ 31 $ 9 $ 5 $ 11 Write-Offs (32) (12) (16) (7) (9) — — (1) Credit Loss Expense 10 7 9 4 5 1 2 2 Other Adjustments 21 11 6 6 — 31 9 — Balance at March 31, 2024 $ 204 $ 62 $ 73 $ 47 $ 27 $ 41 $ 16 $ 12
Aging of Trade Receivables	The aging of trade receivables is presented in the table below. March 31, 2024 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Unbilled Revenue (a)(b) $ 1,066 $ 361 $ 361 $ 250 $ 111 $ 113 $ 174 $ 57 Current 2,301 706 967 586 380 215 192 208 1-31 days past due 265 82 85 50 35 33 39 25 31-61 days past due 95 33 33 24 9 15 7 7 61-91 days past due 46 18 11 8 3 7 3 7 91+ days past due 215 64 57 21 36 67 23 4 Deferred Payment Arrangements (c) 115 40 39 29 10 28 7 1 Trade and Other Receivables $ 4,103 $ 1,304 $ 1,553 $ 968 $ 584 $ 478 $ 445 $ 309 December 31, 2023 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Unbilled Revenue (a)(d) $ 1,273 $ 399 $ 401 $ 280 $ 121 $ 4 $ 22 $ 108 Current 2,306 680 1,009 612 395 48 87 199 1-31 days past due 275 97 91 41 50 12 14 9 31-61 days past due 78 20 34 23 11 3 7 2 61-91 days past due 47 15 17 10 7 2 4 1 91+ days past due 253 67 69 24 45 46 27 3 Deferred Payment Arrangements (c) 104 34 43 26 17 6 — — Trade and Other Receivables $ 4,336 $ 1,312 $ 1,664 $ 1,016 $ 646 $ 121 $ 161 $ 322 (a) Unbilled revenues are recognized by applying customer billing rates to the estimated volumes of energy or natural gas delivered but not yet billed and are included within Receivables and Receivables of VIEs on the Condensed Consolidated Balance Sheets. (b) In March 2024, Duke Energy repaid all outstanding CRC borrowings and terminated the related CRC credit facility. Duke Energy's related restricted receivables outstanding at CRC at the time of termination totaled $682 million, consisting of $316 million and $366 million of restricted receivables that were transferred back to Duke Energy Indiana and Duke Energy Ohio, respectively, to be collected and reported as Receivables on the Condensed Consolidated Balance Sheets. See Note 12 for further information. (c) Due to ongoing financial hardships impacting customers, Duke Energy has permitted customers to defer payment of past-due amounts through installment payment plans. (d) Duke Energy Ohio and Duke Energy Indiana sold, on a revolving basis, nearly all of their retail accounts receivable, including receivables for unbilled revenues, to an affiliate, CRC, and accounted for the transfers of receivables as sales. Accordingly, the receivables sold were not reflected on the Condensed Consolidated Balance Sheets of Duke Energy Ohio and Duke Energy Indiana. These receivables for unbilled revenues are $141 million and $197 million for Duke Energy Ohio and Duke Energy Indiana, respectively, as of December 31, 2023.

Stockholders' Equity (Tables)

Stockholders' Equity (Tables)	3 Months Ended
	Mar. 31, 2024
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 March 31, (in millions, except per share amounts) 2024 2023 Net Income available to Duke Energy common stockholders $ 1,099 $ 765 Less: Loss from discontinued operations attributable to Duke Energy common stockholders (3) (145) Accumulated preferred stock dividends adjustment 12 12 Less: Impact of participating securities 2 1 Income from continuing operations available to Duke Energy common stockholders $ 1,112 $ 921 Loss from discontinued operations, net of tax $ (3) $ (209) Add: Loss attributable to NCI — 64 Loss from discontinued operations attributable to Duke Energy common stockholders $ (3) $ (145) Weighted average common shares outstanding – basic and diluted 771 770 EPS from continuing operations available to Duke Energy common stockholders Basic and diluted (a) $ 1.44 $ 1.20 Loss Per Share from discontinued operations attributable to Duke Energy common stockholders Basic and diluted (a) $ — $ (0.19) Potentially dilutive items excluded from the calculation (b) 2 2 Dividends declared per common share $ 1.025 $ 1.005 Dividends declared on Series A preferred stock per depositary share (c) $ 0.359 $ 0.359 Dividends declared on Series B preferred stock per share (d) $ 24.375 $ 24.375 (a) For the periods presented subsequent to issuance in April 2023, the convertible notes were excluded from the calculations of diluted EPS because the effect was antidilutive. (b) Performance stock awards were not included in the dilutive securities calculation because the performance measures related to the awards had not been met. (c) 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. (d) 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)	3 Months Ended
	Mar. 31, 2024
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 March 31, 2024 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Service cost $ 28 $ 9 $ 8 $ 5 $ 3 $ 1 $ 2 $ 1 Interest cost on projected benefit obligation 82 20 26 12 14 4 6 2 Expected return on plan assets (154) (41) (54) (25) (29) (6) (10) (5) Amortization of actuarial loss 8 2 2 1 1 — 1 1 Amortization of prior service credit (3) — — — — — — (2) Amortization of settlement charges 5 2 1 1 — — — 1 Net periodic pension costs $ (34) $ (8) $ (17) $ (6) $ (11) $ (1) $ (1) $ (2) Three Months Ended March 31, 2023 Duke Duke Duke Duke Duke Duke Energy Progress Energy Energy Energy Energy (in millions) Energy Carolinas Energy Progress Florida Ohio Indiana Piedmont Service cost $ 30 $ 10 $ 9 $ 5 $ 3 $ 1 $ 1 $ 1 Interest cost on projected benefit obligation 86 21 27 12 14 4 7 2 Expected return on plan assets (147) (40) (50) (23) (26) (6) (10) (5) Amortization of actuarial loss 2 — 1 — 1 — 1 — Amortization of prior service credit (3) — — — — — — (2) Amortization of settlement charges 5 2 1 1 — — — 1 Net periodic pension costs $ (27) $ (7) $ (12) $ (5) $ (8) $ (1) $ (1) $ (3)

Income Taxes (Tables)

Income Taxes (Tables)	3 Months Ended
	Mar. 31, 2024
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 March 31, 2024 2023 Duke Energy 13.4 % 13.8 % Duke Energy Carolinas 11.5 % 11.4 % Progress Energy 16.5 % 16.7 % Duke Energy Progress 15.0 % 14.6 % Duke Energy Florida 19.4 % 19.9 % Duke Energy Ohio 16.8 % 16.7 % Duke Energy Indiana 17.3 % 17.2 % Piedmont 19.6 % 17.7 %

Organization and Basis of Pre_4

Organization and Basis of Presentation (Schedule of Cash and Cash Equivalents) (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2023	Dec. 31, 2022
Current Assets
Cash and cash equivalents	$ 459	$ 253
Other Noncurrent Assets
Total cash, cash equivalents and restricted cash	518	357	$ 624	$ 603
Duke Energy (Parent)
Current Assets
Cash and cash equivalents	459	253
Other	33	76
Other Noncurrent Assets
Other	17	16
Total cash, cash equivalents and restricted cash	509	345
Duke Energy Carolinas
Current Assets
Cash and cash equivalents	5	9
Other	6	9
Other Noncurrent Assets
Other	1	1
Total cash, cash equivalents and restricted cash	12	19	30	53
Progress Energy
Current Assets
Cash and cash equivalents	49	59
Other	27	67
Other Noncurrent Assets
Other	10	9
Total cash, cash equivalents and restricted cash	86	135	134	184
Duke Energy Progress
Current Assets
Cash and cash equivalents	27	18
Other	18	31
Other Noncurrent Assets
Other	4	2
Total cash, cash equivalents and restricted cash	49	51	68	79
Duke Energy Florida
Current Assets
Cash and cash equivalents	4	24
Other	9	36
Other Noncurrent Assets
Other	7	7
Total cash, cash equivalents and restricted cash	$ 20	$ 67	$ 44	$ 86

Organization and Basis of Pre_5

Organization and Basis of Presentation (Schedule of Inventory) (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Public Utilities, Inventory [Line Items]
Total inventory	$ 4,281	$ 4,292
Duke Energy (Parent)
Public Utilities, Inventory [Line Items]
Materials and supplies	3,130	3,086
Coal	840	842
Natural gas, oil and other fuel	311	364
Total inventory	4,281	4,292
Duke Energy Carolinas
Public Utilities, Inventory [Line Items]
Materials and supplies	1,078	1,075
Coal	357	364
Natural gas, oil and other fuel	43	45
Total inventory	1,478	1,484
Progress Energy
Public Utilities, Inventory [Line Items]
Materials and supplies	1,547	1,465
Coal	240	231
Natural gas, oil and other fuel	200	205
Total inventory	1,987	1,901
Duke Energy Progress
Public Utilities, Inventory [Line Items]
Materials and supplies	1,039	963
Coal	150	154
Natural gas, oil and other fuel	105	110
Total inventory	1,294	1,227
Duke Energy Florida
Public Utilities, Inventory [Line Items]
Materials and supplies	508	502
Coal	90	77
Natural gas, oil and other fuel	95	95
Total inventory	693	674
Duke Energy Ohio
Public Utilities, Inventory [Line Items]
Materials and supplies	146	139
Coal	27	28
Natural gas, oil and other fuel	12	12
Total inventory	185	179
Duke Energy Indiana
Public Utilities, Inventory [Line Items]
Materials and supplies	316	361
Coal	216	219
Natural gas, oil and other fuel	2	2
Total inventory	534	582
Piedmont
Public Utilities, Inventory [Line Items]
Materials and supplies	12	12
Coal	0	0
Natural gas, oil and other fuel	53	100
Total inventory	$ 65	$ 112

Organization and Basis of Pre_6

Organization and Basis of Presentation (Other Noncurrent Assets) (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023	May 30, 2022
Regulatory Asset [Line Items]
Other	$ 4,072	$ 3,964
Offshore Wind Arrangement
Regulatory Asset [Line Items]
Other			$ 150

Organization and Basis of Pre_7

Organization and Basis of Presentation (Confirmed Obligations) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Duke Energy (Parent)
Contractual Obligations [Roll Forward]
Confirmed obligations at beginning of period	$ 50	$ 87
Invoices confirmed during the period	57	59
Confirmed invoices paid during the period	(31)	(94)
Confirmed obligations at end of period	76	52
Duke Energy Carolinas
Contractual Obligations [Roll Forward]
Confirmed obligations at beginning of period	0	6
Invoices confirmed during the period	0	10
Confirmed invoices paid during the period	0	(9)
Confirmed obligations at end of period	0	7
Progress Energy
Contractual Obligations [Roll Forward]
Confirmed obligations at beginning of period	3	19
Invoices confirmed during the period	1	22
Confirmed invoices paid during the period	(2)	(26)
Confirmed obligations at end of period	2	15
Duke Energy Progress
Contractual Obligations [Roll Forward]
Confirmed obligations at beginning of period	0	8
Invoices confirmed during the period	0	11
Confirmed invoices paid during the period	0	(13)
Confirmed obligations at end of period	0	6
Duke Energy Florida
Contractual Obligations [Roll Forward]
Confirmed obligations at beginning of period	3	11
Invoices confirmed during the period	1	11
Confirmed invoices paid during the period	(2)	(13)
Confirmed obligations at end of period	2	9
Duke Energy Ohio
Contractual Obligations [Roll Forward]
Confirmed obligations at beginning of period	0	5
Invoices confirmed during the period	0	1
Confirmed invoices paid during the period	0	(6)
Confirmed obligations at end of period	0	0
Duke Energy Indiana
Contractual Obligations [Roll Forward]
Confirmed obligations at beginning of period	0	0
Invoices confirmed during the period	0	0
Confirmed invoices paid during the period	0	0
Confirmed obligations at end of period	0	0
Piedmont
Contractual Obligations [Roll Forward]
Confirmed obligations at beginning of period	47	57
Invoices confirmed during the period	56	25
Confirmed invoices paid during the period	(29)	(53)
Confirmed obligations at end of period	$ 74	$ 29

Dispositions (Narrative) (Detai

Dispositions (Narrative) (Details) - Discontinued Operations, Held-for-sale - Commercial Renewables - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Noncontrolling interest balance	$ 66	$ 66
Pre-tax impairment	$ 268	$ 278

Dispositions (Balance Sheet) (D

Dispositions (Balance Sheet) (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Current Assets Held for Sale
Total current assets held for sale	$ 11	$ 14
Noncurrent Assets Held for Sale
Total other noncurrent assets held for sale	308	197
Current Liabilities Associated with Assets Held for Sale
Total current liabilities associated with assets held for sale	251	122
Noncurrent Liabilities Associated with Assets Held for Sale
Total other noncurrent liabilities associated with assets held for sale	126	157
Discontinued Operations, Held-for-sale | Commercial Renewables
Current Assets Held for Sale
Other	11	14
Total current assets held for sale	11	14
Noncurrent Assets Held for Sale
Cost	357	247
Accumulated depreciation and amortization	(57)	(57)
Net property, plant and equipment	300	190
Operating lease right-of-use assets, net	4	4
Other	4	3
Total other noncurrent assets held for sale	8	7
Total Assets Held for Sale	319	211
Current Liabilities Associated with Assets Held for Sale
Accounts payable	97	9
Taxes accrued	1	3
Current maturities of long-term debt	44	5
Unrealized losses on commodity hedges	74	68
Other	35	37
Total current liabilities associated with assets held for sale	251	122
Noncurrent Liabilities Associated with Assets Held for Sale
Long-Term debt	0	39
Operating lease liabilities	5	5
Asset retirement obligations	8	8
Unrealized losses on commodity hedges	102	94
Other	11	11
Total other noncurrent liabilities associated with assets held for sale	126	157
Total Liabilities Associated with Assets Held for Sale	$ 377	$ 279

Dispositions (Income Statement)

Dispositions (Income Statement) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Loss from discontinued operations	$ (3)	$ (209)
Add: Net loss attributable to noncontrolling interest included in discontinued operations	0	64
Net loss from discontinued operations attributable to Duke Energy Corporation	(3)	(145)
Discontinued Operations, Held-for-sale | Commercial Renewables
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Operating revenues	(6)	80
Operation, maintenance and other	4	89
Property and other taxes	0	10
Other income and expenses, net	0	(4)
Interest expense	2	31
(Gain) Loss on disposal	(10)	220
Loss before income taxes	(2)	(274)
Income tax expense (benefit)	1	(65)
Loss from discontinued operations	(3)	(209)
Add: Net loss attributable to noncontrolling interest included in discontinued operations	0	64
Net loss from discontinued operations attributable to Duke Energy Corporation	$ (3)	$ (145)

Dispositions (Cash Flow Stateme

Dispositions (Cash Flow Statement) (Details) - Commercial Renewables - Discontinued Operations, Held-for-sale - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Operating activities	$ (3)	$ (54)
Investing activities	$ 0	$ (151)

Business Segments (Narrative) (

Business Segments (Narrative) (Details)	3 Months Ended
	Mar. 31, 2024 Segment segment
Segment Reporting Information [Line Items]
Number of reportable segments | Segment	2
Duke Energy Ohio
Segment Reporting Information [Line Items]
Number of reportable segments | segment	2

Business Segments (Business Seg

Business Segments (Business Segment Data) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Segment Reporting Information [Line Items]
Operating Revenues	$ 7,671	$ 7,276
Segment income (loss)	1,102	910
Less: Noncontrolling interests	(13)	43
Add: Preferred stock dividend	39	39
Discontinued operations	(3)	(145)
Net Income	1,151	761
Segment assets	178,670		$ 176,893
Impairment of assets and other charges	1	8
Operation, maintenance and other	1,379	1,310
Duke Energy Ohio
Segment Reporting Information [Line Items]
Operating Revenues	678	709
Segment income (loss)	94	100
Net Income	94	100
Segment assets	12,305		$ 12,216
Operation, maintenance and other	126	123
Total Reportable Segments
Segment Reporting Information [Line Items]
Operating Revenues	7,664	7,269
Electric Utilities and Infrastructure
Segment Reporting Information [Line Items]
Operating Revenues	6,785	6,381
Gas Utilities and Infrastructure
Segment Reporting Information [Line Items]
Operating Revenues	879	888
Operating Segments | Total Reportable Segments
Segment Reporting Information [Line Items]
Operating Revenues	7,705	7,309
Segment income (loss)	1,305	1,078
Segment assets	174,070
Operating Segments | Total Reportable Segments | Duke Energy Ohio
Segment Reporting Information [Line Items]
Operating Revenues	678	709
Segment income (loss)	96	101
Segment assets	12,285
Operating Segments | Electric Utilities and Infrastructure
Segment Reporting Information [Line Items]
Operating Revenues	6,803	6,398
Segment income (loss)	1,021	791
Segment assets	156,606
Operating Segments | Electric Utilities and Infrastructure | Duke Energy Ohio
Segment Reporting Information [Line Items]
Operating Revenues	458	474
Segment income (loss)	55	49
Segment assets	7,935
Operating Segments | Gas Utilities and Infrastructure
Segment Reporting Information [Line Items]
Operating Revenues	902	911
Segment income (loss)	284	287
Segment assets	17,464
Operating Segments | Gas Utilities and Infrastructure | Duke Energy Ohio
Segment Reporting Information [Line Items]
Operating Revenues	220	235
Segment income (loss)	41	52
Segment assets	4,350
Other | Other | Duke Energy Ohio
Segment Reporting Information [Line Items]
Operating Revenues	0	0
Segment income (loss)	(2)	(1)
Segment assets	13
Corporate And Eliminations
Segment Reporting Information [Line Items]
Operating Revenues	38	31
Segment income (loss)	(203)	(168)
Segment assets	4,600
Eliminations
Segment Reporting Information [Line Items]
Operating Revenues	(72)	(64)
Segment income (loss)	0	0
Segment assets	0
Eliminations | Duke Energy Ohio
Segment Reporting Information [Line Items]
Operating Revenues	0
Segment income (loss)	0
Segment assets	7
Eliminations | Total Reportable Segments
Segment Reporting Information [Line Items]
Operating Revenues	41	40
Eliminations | Electric Utilities and Infrastructure
Segment Reporting Information [Line Items]
Operating Revenues	18	17
Eliminations | Gas Utilities and Infrastructure
Segment Reporting Information [Line Items]
Operating Revenues	23	23
Eliminations | Other
Segment Reporting Information [Line Items]
Operating Revenues	31	24
Other
Segment Reporting Information [Line Items]
Operating Revenues	$ 7	$ 7

Regulatory Matters (Regulatory

Regulatory Matters (Regulatory Matters Narrative - Duke Energy Carolinas and Duke Energy Progress) (Details) - Nuclear Regulatory Commission - contention					3 Months Ended
	Sep. 27, 2021	Jul. 28, 2021	Jun. 07, 2021	Jun. 06, 2021	Mar. 31, 2024
Public Utilities, General Disclosures [Line Items]
Operating license extension (in years)					20 years
Oconee Nuclear Station Subsequent License Renewal | Duke Energy Carolinas
Public Utilities, General Disclosures [Line Items]
Comment period (in days)		60 days
Number of contentions	3
Oconee Nuclear Station Subsequent License Renewal | Oconee Nuclear Station | Duke Energy Carolinas
Public Utilities, General Disclosures [Line Items]
Operating license extension (in years)			20 years
Operating license (in years)			80 years	60 years

Regulatory Matters (Regulator_2

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

3 Months Ended

4 Months Ended

12 Months Ended

24 Months Ended

Mar. 14, 2024 USD ($) numberOfCombustionTurbines MW

Jan. 04, 2024 USD ($)

Dec. 15, 2023

Aug. 22, 2023 USD ($)

Jan. 19, 2023

Mar. 31, 2024 USD ($)

Mar. 31, 2023 USD ($)

Dec. 31, 2026 USD ($)

Dec. 14, 2027 USD ($)

Dec. 14, 2026 USD ($)

Aug. 31, 2026 USD ($)

Dec. 14, 2025 USD ($)

Aug. 31, 2025 USD ($)

Dec. 14, 2024 USD ($)

Aug. 31, 2024 USD ($)

Jan. 03, 2028 USD ($)

Jan. 03, 2026 USD ($)

Public Utilities, General Disclosures [Line Items]

Impairment of assets and other charges

$ 1

$ 8

Operation, maintenance and other

1,379

1,310

Duke Energy Carolinas

Public Utilities, General Disclosures [Line Items]

Impairment of assets and other charges

1

2

Operation, maintenance and other

$ 451

$ 440

2023 North Carolina Rate Case | NCUC | Duke Energy Carolinas

Public Utilities, General Disclosures [Line Items]

Proposed rate period (in years)

3 years

Settlement rate, amount

$ 19,500

Settlement rate, period (in years)

3 years

Approved return on equity percentage (as a percent)

10.10%

2023 North Carolina Rate Case | NCUC | Duke Energy Carolinas | Equity

Public Utilities, General Disclosures [Line Items]

Approved return on equity percentage (as a percent)

53%

2023 North Carolina Rate Case | NCUC | Duke Energy Carolinas | Forecast

Public Utilities, General Disclosures [Line Items]

Requested rate increase (decrease), amount

$ 823

$ 150

$ 172

$ 501

Requested rate increase (decrease) (as a percent)

15.70%

Approved rate increase (decrease), amount

$ 768

$ 158

$ 174

$ 436

2023 North Carolina Rate Case, Retail Allocated | NCUC | Duke Energy Carolinas

Public Utilities, General Disclosures [Line Items]

Settlement rate, amount

$ 4,600

2024 South Carolina Rate Case | PSCSC | Duke Energy Carolinas

Public Utilities, General Disclosures [Line Items]

Requested rate increase (decrease), amount

$ 323

Requested rate increase (decrease) (as a percent)

15.50%

Requested return on equity (as a percent)

10.50%

2024 South Carolina Rate Case | PSCSC | Duke Energy Carolinas | Equity

Public Utilities, General Disclosures [Line Items]

Equity ratio (as a percent)

53%

2024 South Carolina Rate Case | PSCSC | Duke Energy Carolinas | Forecast

Public Utilities, General Disclosures [Line Items]

Requested rate increase, percentage, net of tax

4.10%

11.40%

Requested rate increase (decrease), amended amount

$ 84

$ 239

Marshall Combustion Turbines CPCN Proceedings | NCUC | Duke Energy Carolinas

Public Utilities, General Disclosures [Line Items]

Requested rate increase (decrease), amount

$ 104

Requested rate increase (decrease) (as a percent)

2.20%

New combustion turbines (in megawatts) | MW

850

Hydrogen-capable CTs | numberOfCombustionTurbines

2

Regulatory Matters (Regulator_3

Regulatory Matters (Regulatory Matters Narrative - Duke Energy Progress) (Details)

3 Months Ended

7 Months Ended

11 Months Ended

12 Months Ended

Mar. 28, 2024 USD ($) MW

Aug. 18, 2023 USD ($)

Apr. 26, 2023

Mar. 31, 2024 USD ($)

Mar. 31, 2023 USD ($)

Dec. 31, 2025 USD ($)

Apr. 30, 2024 USD ($)

Aug. 17, 2027 USD ($)

Aug. 17, 2026 USD ($)

May 31, 2026 USD ($)

Aug. 17, 2025 USD ($)

May 31, 2025 USD ($)

Aug. 17, 2024 USD ($)

Jan. 01, 2026 MW

Apr. 25, 2024 USD ($)

Public Utilities, General Disclosures [Line Items]

Impairment of assets and other charges

$ 1,000,000

$ 8,000,000

Operation, maintenance and other

1,379,000,000

1,310,000,000

Debt issuances

3,475,000,000

Duke Energy Progress

Public Utilities, General Disclosures [Line Items]

Impairment of assets and other charges

0

4,000,000

Operation, maintenance and other

375,000,000

$ 350,000,000

Debt issuances

$ 500,000,000

Duke Energy Progress | Subsequent event | Storm Recovery Bonds

Public Utilities, General Disclosures [Line Items]

Debt issuances

$ 177,000,000

Duke Energy Progress | Subsequent event | 5.404% Storm Recovery Bonds | Storm Recovery Bonds

Public Utilities, General Disclosures [Line Items]

Debt issuances

$ 177,000,000

2022 North Carolina Rate Case | NCUC | Duke Energy Progress

Public Utilities, General Disclosures [Line Items]

Proposed rate period (in years)

3 years

Settlement rate, amount

$ 12,200,000,000

Settlement rate, period (in years)

3 years

Approved return on equity percentage (as a percent)

9.80%

2022 North Carolina Rate Case | NCUC | Duke Energy Progress | Equity

Public Utilities, General Disclosures [Line Items]

Approved return on equity percentage (as a percent)

53%

2022 North Carolina Rate Case | NCUC | Duke Energy Progress | Forecast

Public Utilities, General Disclosures [Line Items]

Requested rate increase (decrease), amount

$ 615,000,000

$ 326,000,000

$ 138,000,000

$ 151,000,000

Approved rate increase (decrease), amount

$ 494,000,000

$ 135,000,000

$ 126,000,000

$ 233,000,000

2022 North Carolina Rate Case, Retail Allocated | NCUC | Duke Energy Progress

Public Utilities, General Disclosures [Line Items]

Settlement rate, amount

$ 3,500,000,000

Person County Cycle CPCN Proceeding | NCUC | Duke Energy Progress

Public Utilities, General Disclosures [Line Items]

Requested rate increase (decrease), amount

$ 98,000,000

Generation capacity (MW) | MW

1,360

Requested rate increase (decrease) (as a percent)

2.60%

Person County Cycle CPCN Proceeding | NCUC | NCEMC | Forecast

Public Utilities, General Disclosures [Line Items]

Generation capacity (MW) | MW

225

Person County Cycle CPCN Proceeding | NCEMC | Duke Energy Progress | Forecast

Public Utilities, General Disclosures [Line Items]

Generation capacity (MW) | MW

1,135

Regulatory Matters (Regulator_4

Regulatory Matters (Regulatory Matters Narrative - Duke Energy Florida) (Details) outage in Millions, customer in Millions

1 Months Ended

12 Months Ended

Apr. 02, 2024

Oct. 16, 2023 USD ($)

Jan. 23, 2023 USD ($)

Oct. 17, 2022 USD ($)

Oct. 04, 2022 USD ($)

Jun. 15, 2022 USD ($)

Jan. 14, 2021 USD ($)

Jul. 01, 2020 USD ($) plant MW

Jan. 31, 2024

Dec. 31, 2027 USD ($)

Dec. 31, 2026 USD ($)

Dec. 31, 2025 USD ($)

Dec. 31, 2024 USD ($)

Dec. 31, 2023 USD ($)

Dec. 31, 2022 USD ($)

Mar. 31, 2024 USD ($)

Sep. 29, 2023 USD ($)

Aug. 30, 2023 customer

Jun. 30, 2023 USD ($)

Mar. 31, 2023 USD ($)

Sep. 28, 2022 outage

Sep. 27, 2022 USD ($)

Apr. 11, 2022 USD ($)

Duke Energy Florida | Solar Project

Public Utilities, General Disclosures [Line Items]

Estimated cost of facilities

$ 1,000,000,000

FPSC | Duke Energy Florida

Public Utilities, General Disclosures [Line Items]

Number of solar plants | plant

10

Generation capacity (MW) | MW

750

2021 Settlement | FPSC | Duke Energy Florida

Public Utilities, General Disclosures [Line Items]

Approved rate increase (decrease), amount

$ 49,000,000

$ 67,000,000

Public utilities, approved equity capital structure, percentage (as a percent)

53%

Public utilities, basis points, increase, percentage

0.25%

Contract with customer, asset, after allowance for credit loss, noncurrent

$ 154,000,000

$ 173,000,000

$ 149,000,000

Capitalized contract cost during period

$ 8,000,000

$ 54,000,000

Proceeds from legal settlements

$ 180,000,000

Requested rate increase (decrease), amount

$ (56,000,000)

Future investment in infrastructure

$ 1,000,000,000

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

Public Utilities, General Disclosures [Line Items]

Public utilities, basis points, increase, percentage

0.50%

2021 Settlement | FPSC | Duke Energy Florida | Minimum

Public Utilities, General Disclosures [Line Items]

Approved return on equity percentage (as a percent)

8.85%

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

Public Utilities, General Disclosures [Line Items]

Approved return on equity percentage (as a percent)

9.85%

2021 Settlement | FPSC | Duke Energy Florida | Maximum

Public Utilities, General Disclosures [Line Items]

Approved return on equity percentage (as a percent)

10.85%

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

Public Utilities, General Disclosures [Line Items]

Approved return on equity percentage (as a percent)

10.10%

2021 Settlement | FPSC | Duke Energy Florida | Weighted Average

Public Utilities, General Disclosures [Line Items]

Approved return on equity percentage (as a percent)

9.85%

2021 Settlement | FPSC | Duke Energy Florida | Forecast

Public Utilities, General Disclosures [Line Items]

Approved rate increase (decrease), amount

$ 79,000,000

Contract with customer, asset, after allowance for credit loss, noncurrent

$ 24,000,000

Storm Protection Plan | FPSC | Duke Energy Florida

Public Utilities, General Disclosures [Line Items]

Investment in transmission and distribution

$ 7,000,000,000

Cost reduction to transmission loop

$ 80,000,000

Cost reduction period (in years)

10 years

Hurricane Ian

Public Utilities, General Disclosures [Line Items]

Actual storm costs

$ 431,000,000

Hurricane Ian | FPSC | Duke Energy Florida | Hurricane Ian

Public Utilities, General Disclosures [Line Items]

Number of outages | outage

1.1

Storm reserves

$ 132,000,000

$ 107,000,000

Interim recovery payments

$ 442,000,000

Hurricane Idalia | FPSC | Duke Energy Florida | Hurricane Ian

Public Utilities, General Disclosures [Line Items]

Interim recovery payments

$ 74,000,000

Hurricane Idalia, Retail Portion | FPSC | Duke Energy Florida | Hurricane Ian

Public Utilities, General Disclosures [Line Items]

Interim recovery payments

92,000,000

Hurricane Idalia | FPSC | Duke Energy Florida | Hurricane Ian

Public Utilities, General Disclosures [Line Items]

Interim recovery payments

$ 166,000,000

Number of impacted customers | customer

0.2

2022 North Carolina Rate Case | FPSC | Duke Energy Florida

Public Utilities, General Disclosures [Line Items]

Requested rate increase (decrease) (as a percent)

4%

2022 North Carolina Rate Case | FPSC | Duke Energy Florida | Weighted Average | Subsequent event

Public Utilities, General Disclosures [Line Items]

Approved return on equity percentage (as a percent)

11.15%

Public utilities, approved equity capital structure, percentage (as a percent)

53%

2022 North Carolina Rate Case | FPSC | Duke Energy Florida | Forecast

Public Utilities, General Disclosures [Line Items]

Requested rate increase (decrease), amount

$ 129,000,000

$ 98,000,000

$ 593,000,000

Regulatory Matters (Regulator_5

Regulatory Matters (Regulatory Matters Narrative - Duke Energy Ohio) (Details) - Duke Energy Ohio - USD ($) $ in Millions	Apr. 01, 2024	Oct. 12, 2023	Apr. 28, 2023	Dec. 01, 2022	Sep. 19, 2022	Jul. 14, 2022	Oct. 01, 2021
Duke Energy Ohio Electric Base Rate Case | PUCO
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount					$ 23		$ 55
Requested return on equity (as a percent)					9.50%
Equity ratio (as a percent)					50.50%
Duke Energy Ohio Gas Base Rate Case | PUCO
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount			$ 32			$ 49
Requested return on equity (as a percent)			9.60%
Duke Energy Ohio Gas Base Rate Case | PUCO | Maximum
Public Utilities, General Disclosures [Line Items]
Equity ratio (as a percent)			52.32%
Duke Energy Kentucky Electric Base Rate Case | KPSC
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount				$ 75
Approved rate increase (decrease), amount		$ 48
Duke Energy Kentucky Electric Base Rate Case | KPSC | Maximum
Public Utilities, General Disclosures [Line Items]
Equity ratio (as a percent)		52.145%
Duke Energy Kentucky Electric Base Rate Case, Electric Riders | KPSC
Public Utilities, General Disclosures [Line Items]
Approved return on equity percentage (as a percent)		9.65%
Duke Energy Kentucky Electric Base Rate Case, Electric Base Rates | KPSC
Public Utilities, General Disclosures [Line Items]
Approved return on equity percentage (as a percent)		9.75%
Duke Energy Ohio Energy Security Plan | PUCO | Subsequent event
Public Utilities, General Disclosures [Line Items]
Settlement rate, period (in years)	3 years

Regulatory Matters (Regulator_6

Regulatory Matters (Regulatory Matters Narrative - Duke Energy Indiana) (Details) - USD ($) $ in Millions		3 Months Ended		12 Months Ended
	Apr. 04, 2024	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2026	Dec. 31, 2025	Sep. 20, 2023	Jun. 15, 2022
Public Utilities, General Disclosures [Line Items]
Impairment of assets and other charges		$ 1	$ 8
Operating Revenues		7,671	7,276
Duke Energy Indiana
Public Utilities, General Disclosures [Line Items]
Operating Revenues		$ 759	$ 975
Indiana Coal Ash Recovery | IURC | Duke Energy Indiana
Public Utilities, General Disclosures [Line Items]
Interest rate on refunds (as a percent)						4.71%
TDSIG 2.0 | IURC | Duke Energy Indiana
Public Utilities, General Disclosures [Line Items]
Future investment in infrastructure							$ 2,000
2024 Indiana Rate Case | IURC | Duke Energy Indiana | Subsequent event
Public Utilities, General Disclosures [Line Items]
Future investment in infrastructure	$ 1,600
Requested rate increase (decrease), amount	$ 492
Requested rate increase, percentage, net of tax	16.20%
Requested return on equity (as a percent)	10.50%
Equity ratio (as a percent)	53%
2024 Indiana Rate Case | IURC | Duke Energy Indiana | Forecast | Subsequent event
Public Utilities, General Disclosures [Line Items]
Requested rate increase, percentage, net of tax				4.50%	11.70%

Regulatory Matters (Regulator_7

Regulatory Matters (Regulatory Matters Narrative - Piedmont) (Details) - Piedmont - 2024 North Carolina Rate Case - NCUC - Subsequent event $ in Millions	Apr. 01, 2024 USD ($)
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount	$ 159
Requested rate increase, percentage, net of tax	12.50%
Requested return on equity (as a percent)	10.50%
Equity ratio (as a percent)	53%
Percentage of additions covered under IMR mechanism	40%

Commitments and Contingencies_2

Commitments and Contingencies (Schedule of Environmental Loss Contingencies) (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Environmental Matters Details [Line Items]
Reserves for Environmental Remediation	$ 86	$ 88
Duke Energy Carolinas
Environmental Matters Details [Line Items]
Reserves for Environmental Remediation	23	23
Progress Energy
Environmental Matters Details [Line Items]
Reserves for Environmental Remediation	19	19
Duke Energy Progress
Environmental Matters Details [Line Items]
Reserves for Environmental Remediation	9	9
Duke Energy Florida
Environmental Matters Details [Line Items]
Reserves for Environmental Remediation	10	10
Duke Energy Ohio
Environmental Matters Details [Line Items]
Reserves for Environmental Remediation	34	36
Duke Energy Indiana
Environmental Matters Details [Line Items]
Reserves for Environmental Remediation	2	2
Piedmont
Environmental Matters Details [Line Items]
Reserves for Environmental Remediation	$ 7	$ 7

Commitments and Contingencies_3

Commitments and Contingencies (Narrative) (Details) $ in Millions	Mar. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Feb. 28, 2021 case
Texas Storm Uri Tort Litigation | Pending Litigation
Loss Contingencies [Line Items]
Loss contingency, pending claims, number | case			5
Duke Energy Carolinas | Asbestos-related Injuries and Damages Claims
Loss Contingencies [Line Items]
Asbestos-related injuries and damages reserves	$ 417	$ 423
Probable insurance recoveries	572	572
Duke Energy and Duke Energy Carolinas | ASU 2016-13
Loss Contingencies [Line Items]
Reserve for credit losses for insurance receivables	$ 9	$ 9

Debt and Credit Facilities (Sum

Debt and Credit Facilities (Summary of Debt Issuances) (Details)	3 Months Ended
	Mar. 31, 2024 USD ($)
Debt Instrument [Line Items]
Debt issuances	$ 3,475,000,000
4.85% January 2024 2024 Notes Due January 2027 | Unsecured Debt
Debt Instrument [Line Items]
Interest rate (as a percent)	4.85%
Debt issuances	$ 600,000,000
4.85% January 2024 2024 Notes Due January 2029 | Unsecured Debt
Debt Instrument [Line Items]
Interest rate (as a percent)	4.85%
Debt issuances	$ 650,000,000
4.85% January 2024 Notes Due January 2034 | First Mortgage Bonds
Debt Instrument [Line Items]
Interest rate (as a percent)	4.85%
Debt issuances	$ 575,000,000
5.40% January 2024 Notes Due January 2054 | First Mortgage Bonds
Debt Instrument [Line Items]
Interest rate (as a percent)	5.40%
Debt issuances	$ 425,000,000
5.25% March 2024 Notes Due March 2034 | First Mortgage Bonds
Debt Instrument [Line Items]
Interest rate (as a percent)	5.25%
Debt issuances	$ 300,000,000
5.10% March 2024 Notes Due March 2034 | First Mortgage Bonds
Debt Instrument [Line Items]
Interest rate (as a percent)	5.10%
Debt issuances	$ 500,000,000
5.55% March 2024 Notes Due March 2054 | First Mortgage Bonds
Debt Instrument [Line Items]
Interest rate (as a percent)	5.55%
Debt issuances	$ 425,000,000
Maturities Due March 2024
Debt Instrument [Line Items]
Repayments of debt	1,000,000,000
Duke Energy (Parent)
Debt Instrument [Line Items]
Debt issuances	1,250,000,000
Duke Energy (Parent) | 4.85% January 2024 2024 Notes Due January 2027 | Unsecured Debt
Debt Instrument [Line Items]
Debt issuances	600,000,000
Duke Energy (Parent) | 4.85% January 2024 2024 Notes Due January 2029 | Unsecured Debt
Debt Instrument [Line Items]
Debt issuances	650,000,000
Duke Energy Carolinas
Debt Instrument [Line Items]
Debt issuances	1,000,000,000
Duke Energy Carolinas | 4.85% January 2024 2024 Notes Due January 2027 | Unsecured Debt
Debt Instrument [Line Items]
Debt issuances	0
Duke Energy Carolinas | 4.85% January 2024 2024 Notes Due January 2029 | Unsecured Debt
Debt Instrument [Line Items]
Debt issuances	0
Duke Energy Carolinas | 4.85% January 2024 Notes Due January 2034 | First Mortgage Bonds
Debt Instrument [Line Items]
Debt issuances	575,000,000
Duke Energy Carolinas | 5.40% January 2024 Notes Due January 2054 | First Mortgage Bonds
Debt Instrument [Line Items]
Debt issuances	425,000,000
Duke Energy Carolinas | 5.25% March 2024 Notes Due March 2034 | First Mortgage Bonds
Debt Instrument [Line Items]
Debt issuances	0
Duke Energy Carolinas | 5.10% March 2024 Notes Due March 2034 | First Mortgage Bonds
Debt Instrument [Line Items]
Debt issuances	0
Duke Energy Carolinas | 5.55% March 2024 Notes Due March 2054 | First Mortgage Bonds
Debt Instrument [Line Items]
Debt issuances	0
Duke Energy Progress
Debt Instrument [Line Items]
Debt issuances	500,000,000
Duke Energy Progress | 4.85% January 2024 2024 Notes Due January 2027 | Unsecured Debt
Debt Instrument [Line Items]
Debt issuances	0
Duke Energy Progress | 4.85% January 2024 2024 Notes Due January 2029 | Unsecured Debt
Debt Instrument [Line Items]
Debt issuances	0
Duke Energy Progress | 4.85% January 2024 Notes Due January 2034 | First Mortgage Bonds
Debt Instrument [Line Items]
Debt issuances	0
Duke Energy Progress | 5.40% January 2024 Notes Due January 2054 | First Mortgage Bonds
Debt Instrument [Line Items]
Debt issuances	0
Duke Energy Progress | 5.25% March 2024 Notes Due March 2034 | First Mortgage Bonds
Debt Instrument [Line Items]
Debt issuances	0
Duke Energy Progress | 5.10% March 2024 Notes Due March 2034 | First Mortgage Bonds
Debt Instrument [Line Items]
Debt issuances	500,000,000
Duke Energy Progress | 5.55% March 2024 Notes Due March 2054 | First Mortgage Bonds
Debt Instrument [Line Items]
Debt issuances	0
Duke Energy Ohio
Debt Instrument [Line Items]
Debt issuances	425,000,000
Duke Energy Ohio | 4.85% January 2024 Notes Due January 2034 | First Mortgage Bonds
Debt Instrument [Line Items]
Debt issuances	0
Duke Energy Ohio | 5.40% January 2024 Notes Due January 2054 | First Mortgage Bonds
Debt Instrument [Line Items]
Debt issuances	0
Duke Energy Ohio | 5.25% March 2024 Notes Due March 2034 | First Mortgage Bonds
Debt Instrument [Line Items]
Debt issuances	0
Duke Energy Ohio | 5.10% March 2024 Notes Due March 2034 | First Mortgage Bonds
Debt Instrument [Line Items]
Debt issuances	0
Duke Energy Ohio | 5.55% March 2024 Notes Due March 2054 | First Mortgage Bonds
Debt Instrument [Line Items]
Debt issuances	425,000,000
Duke Energy Indiana
Debt Instrument [Line Items]
Debt issuances	300,000,000
Duke Energy Indiana | 4.85% January 2024 Notes Due January 2034 | First Mortgage Bonds
Debt Instrument [Line Items]
Debt issuances	0
Duke Energy Indiana | 5.40% January 2024 Notes Due January 2054 | First Mortgage Bonds
Debt Instrument [Line Items]
Debt issuances	0
Duke Energy Indiana | 5.25% March 2024 Notes Due March 2034 | First Mortgage Bonds
Debt Instrument [Line Items]
Debt issuances	300,000,000
Duke Energy Indiana | 5.10% March 2024 Notes Due March 2034 | First Mortgage Bonds
Debt Instrument [Line Items]
Debt issuances	0
Duke Energy Indiana | 5.55% March 2024 Notes Due March 2054 | First Mortgage Bonds
Debt Instrument [Line Items]
Debt issuances	$ 0

Debt and Credit Facilities (Nar

Debt and Credit Facilities (Narrative) (Details) € in Millions			1 Months Ended
	Apr. 24, 2024 USD ($)	Mar. 26, 2024 USD ($)	Apr. 30, 2024 USD ($)	Apr. 30, 2023	Apr. 30, 2024 EUR (€)	Apr. 25, 2024 USD ($)	Mar. 31, 2024 USD ($)
Debt Instrument [Line Items]
Sale of debt							$ 3,475,000,000
Master Credit Facility
Debt Instrument [Line Items]
Facility size							9,000,000,000
Duke Energy (Parent)
Debt Instrument [Line Items]
Sale of debt							1,250,000,000
Duke Energy (Parent) | 4.25% Convertible Senior notes Due April 2026
Debt Instrument [Line Items]
Conversion ratio				0.0084131
Duke Energy Florida | Master Credit Facility
Debt Instrument [Line Items]
Facility size							950,000,000
Duke Energy Progress
Debt Instrument [Line Items]
Sale of debt							500,000,000
Duke Energy Progress | Master Credit Facility
Debt Instrument [Line Items]
Facility size							$ 1,575,000,000
Term Loan Facility | Duke Energy (Parent) | Duke Energy Term Loan Facility
Debt Instrument [Line Items]
Facility size		$ 700,000,000
Extension period (in years)		30 days
Facility term (in years)		364 days
Term Loan Facility | Duke Energy (Parent) | Duke Energy Term Loan Facility | Subsequent event
Debt Instrument [Line Items]
Borrowing amount	$ 500,000,000
Unsecured Debt | Senior Notes 3.75% Due 2031 | Subsequent event
Debt Instrument [Line Items]
Sale of debt			$ 815,000,000		€ 750
Interest rate (as a percent)			3.75%		3.75%
Unsecured Debt | Duke Energy (Parent) | Senior Notes 3.75% Due 2031 | Subsequent event
Debt Instrument [Line Items]
Sale of debt | €					€ 750
Secured Debt | Variable Rate Term Loan Due March 2024 | Subsequent event
Debt Instrument [Line Items]
Repayment of debt			$ 1,000,000,000
First Mortgage Bonds | Duke Energy Florida | First Mortgage Bonds due April 2074 | Subsequent event
Debt Instrument [Line Items]
Sale of debt			$ 173,000,000
Facility term (in years)			12 months
First Mortgage Bonds | Duke Energy Florida | First Mortgage Bonds due April 2074 | Subsequent event | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)			0.35%
Storm Recovery Bonds | Duke Energy Progress | Subsequent event
Debt Instrument [Line Items]
Sale of debt						$ 177,000,000
Storm Recovery Bonds | Duke Energy Progress | 5.404% Storm Recovery Bonds | Subsequent event
Debt Instrument [Line Items]
Sale of debt			$ 177,000,000
Interest rate (as a percent)			5.404%		5.404%

Debt and Credit Facilities (S_2

Debt and Credit Facilities (Summary of Current Maturities of Long-term Debt) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Dec. 31, 2023
Debt Instrument [Line Items]
Current maturities of long-term debt	$ 2,274	$ 2,800
Other debt securities
Debt Instrument [Line Items]
Current maturities of long-term debt	$ 249
Duke Energy (Parent) | Debt Maturing April 2024, 3.75% Coupon | Unsecured Debt
Debt Instrument [Line Items]
Interest rate (as a percent)	3.75%
Current maturities of long-term debt	$ 1,000
Duke Energy Florida
Debt Instrument [Line Items]
Current maturities of long-term debt	$ 586	589
Duke Energy Florida | 6.395% Notes Due April 2024 | Secured Debt
Debt Instrument [Line Items]
Interest rate (as a percent)	6.395%
Current maturities of long-term debt	$ 163
Duke Energy Florida | 6.226% Notes Due April 2024 | Secured Debt
Debt Instrument [Line Items]
Interest rate (as a percent)	6.226%
Current maturities of long-term debt	$ 162
Duke Energy Florida | 4.922% Notes Due October 2073 | First Mortgage Bonds
Debt Instrument [Line Items]
Interest rate (as a percent)	4.922%
Current maturities of long-term debt	$ 200
Facility term (in years)	12 months
Duke Energy Carolinas
Debt Instrument [Line Items]
Current maturities of long-term debt	$ 520	$ 19
Duke Energy Carolinas | 6.176% Notes Due January 2025 | Secured Debt
Debt Instrument [Line Items]
Interest rate (as a percent)	6.176%
Current maturities of long-term debt	$ 500

Debt and Credit Facilities (Sch

Debt and Credit Facilities (Schedule of Line of Credit Facilities) (Details) - Master Credit Facility	Mar. 31, 2024 USD ($)
Line of Credit Facility [Line Items]
Facility size	$ 9,000,000,000
Commercial paper	(3,759,000,000)
Outstanding letters of credit	(38,000,000)
Tax-exempt bonds	(81,000,000)
Available capacity under the Master Credit Facility	5,122,000,000
Duke Energy Carolinas
Line of Credit Facility [Line Items]
Facility size	1,400,000,000
Commercial paper	(355,000,000)
Outstanding letters of credit	(4,000,000)
Tax-exempt bonds	0
Available capacity under the Master Credit Facility	1,041,000,000
Duke Energy Progress
Line of Credit Facility [Line Items]
Facility size	1,575,000,000
Commercial paper	(904,000,000)
Outstanding letters of credit	(1,000,000)
Tax-exempt bonds	0
Available capacity under the Master Credit Facility	670,000,000
Duke Energy Florida
Line of Credit Facility [Line Items]
Facility size	950,000,000
Commercial paper	(66,000,000)
Outstanding letters of credit	(7,000,000)
Tax-exempt bonds	0
Available capacity under the Master Credit Facility	877,000,000
Duke Energy Ohio
Line of Credit Facility [Line Items]
Facility size	1,050,000,000
Commercial paper	(331,000,000)
Outstanding letters of credit	0
Tax-exempt bonds	0
Available capacity under the Master Credit Facility	719,000,000
Duke Energy Indiana
Line of Credit Facility [Line Items]
Facility size	950,000,000
Commercial paper	(286,000,000)
Outstanding letters of credit	0
Tax-exempt bonds	(81,000,000)
Available capacity under the Master Credit Facility	583,000,000
Piedmont
Line of Credit Facility [Line Items]
Facility size	800,000,000
Commercial paper	(508,000,000)
Outstanding letters of credit	0
Tax-exempt bonds	0
Available capacity under the Master Credit Facility	292,000,000
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	2,275,000,000
Commercial paper	(1,309,000,000)
Outstanding letters of credit	(26,000,000)
Tax-exempt bonds	0
Available capacity under the Master Credit Facility	$ 940,000,000

Goodwill (Details)

Goodwill (Details) - USD ($)	Mar. 31, 2024	Dec. 31, 2023
Goodwill [Line Items]
Goodwill	$ 19,303,000,000	$ 19,303,000,000
Accumulated impairment charges	0	0
Duke Energy Ohio
Goodwill [Line Items]
Goodwill	920,000,000	920,000,000
Accumulated impairment charges	216,000,000	216,000,000
Progress Energy
Goodwill [Line Items]
Goodwill	3,655,000,000	3,655,000,000
Piedmont
Goodwill [Line Items]
Goodwill	49,000,000	49,000,000
Electric Utilities and Infrastructure
Goodwill [Line Items]
Goodwill	17,400,000,000	17,400,000,000
Electric Utilities and Infrastructure | Duke Energy Ohio
Goodwill [Line Items]
Goodwill	596,000,000	596,000,000
Electric Utilities and Infrastructure | Progress Energy
Goodwill [Line Items]
Accumulated impairment charges	0	0
Gas Utilities and Infrastructure
Goodwill [Line Items]
Goodwill	1,900,000,000	1,900,000,000
Gas Utilities and Infrastructure | Duke Energy Ohio
Goodwill [Line Items]
Goodwill	324,000,000	324,000,000
Gas Utilities and Infrastructure | Piedmont
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
	Mar. 31, 2024	Mar. 31, 2023
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	$ 5,720	$ 5,609
Duke Energy Carolinas
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	1,803	1,526
Duke Energy Carolinas | Corporate governance and shared service expenses | Related Party
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	214	196
Duke Energy Carolinas | Indemnification coverages | Related Party
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	11	9
Duke Energy Carolinas | JDA | Duke Energy Progress
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	40	29
Related party transaction, other revenues from transactions with related party	16	13
Duke Energy Carolinas | Intercompany natural gas purchases and sales | Related Party
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	4	5
Progress Energy
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	2,516	2,436
Progress Energy | Corporate governance and shared service expenses | Related Party
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	188	178
Progress Energy | Indemnification coverages | Related Party
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	14	12
Progress Energy | JDA | Duke Energy Carolinas
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	16	13
Related party transaction, other revenues from transactions with related party	40	29
Progress Energy | Intercompany natural gas purchases and sales | Related Party
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	19	19
Duke Energy Progress
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	1,385	1,262
Duke Energy Progress | Corporate governance and shared service expenses | Related Party
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	114	107
Duke Energy Progress | Indemnification coverages | Related Party
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	6	5
Duke Energy Progress | JDA | Duke Energy Carolinas
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	16	13
Related party transaction, other revenues from transactions with related party	40	29
Duke Energy Progress | Intercompany natural gas purchases and sales | Related Party
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	19	19
Duke Energy Florida
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	1,128	1,170
Duke Energy Florida | Corporate governance and shared service expenses | Related Party
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	74	71
Duke Energy Florida | Indemnification coverages | Related Party
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	8	7
Duke Energy Ohio
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	526	561
Duke Energy Ohio | Corporate governance and shared service expenses | Related Party
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	77	73
Duke Energy Ohio | Indemnification coverages | Related Party
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	2	1
Duke Energy Indiana
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	634	809
Duke Energy Indiana | Corporate governance and shared service expenses | Related Party
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	102	99
Duke Energy Indiana | Indemnification coverages | Related Party
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	2	2
Piedmont
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	342	369
Piedmont | Corporate governance and shared service expenses | Related Party
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	41	38
Piedmont | Indemnification coverages | Related Party
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	1	1
Piedmont | Intercompany natural gas purchases and sales | Related Party
Related Party Transaction [Line Items]
Related party transaction, other revenues from transactions with related party	23	24
Piedmont | Natural gas storage and transportation costs | Related Party
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	$ 6	$ 6

Related Party Transactions (Int

Related Party Transactions (Intercompany Income Taxes) (Details) - Related Party - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Duke Energy Carolinas
Related Party Transaction [Line Items]
Intercompany income tax receivable	$ 0	$ 0
Intercompany income tax payable	39	81
Progress Energy
Related Party Transaction [Line Items]
Intercompany income tax receivable	0	0
Intercompany income tax payable	30	92
Duke Energy Progress
Related Party Transaction [Line Items]
Intercompany income tax receivable	0	0
Intercompany income tax payable	69	94
Duke Energy Florida
Related Party Transaction [Line Items]
Intercompany income tax receivable	0	0
Intercompany income tax payable	31	114
Duke Energy Ohio
Related Party Transaction [Line Items]
Intercompany income tax receivable	0	91
Intercompany income tax payable	15	0
Duke Energy Indiana
Related Party Transaction [Line Items]
Intercompany income tax receivable	9	53
Intercompany income tax payable	0	0
Piedmont
Related Party Transaction [Line Items]
Intercompany income tax receivable	0	0
Intercompany income tax payable	$ 76	$ 57

Derivative and Hedging - Narrat

Derivative and Hedging - Narrative (Details) € in Millions	Apr. 30, 2024 USD ($)	Apr. 30, 2024 EUR (€)	Mar. 31, 2024 USD ($)
Debt Instrument [Line Items]
Debt issuances			$ 3,475,000,000
Duke Energy (Parent)
Debt Instrument [Line Items]
Debt issuances			$ 1,250,000,000
Senior Notes 3.75% Due 2031 | Subsequent event | Unsecured Debt
Debt Instrument [Line Items]
Debt issuances	$ 815,000,000	€ 750
Interest rate (as a percent)	3.75%	3.75%
Senior Notes 3.75% Due 2031 | Duke Energy (Parent) | Subsequent event | Unsecured Debt
Debt Instrument [Line Items]
Debt issuances | €		€ 750
Senior Notes 3.75 Percent Due 2031, US Dollar Converted | Subsequent event | Unsecured Debt
Debt Instrument [Line Items]
Interest rate (as a percent)	5.648%	5.648%
Senior Notes 3.75 Percent Due 2031, US Dollar Converted | Duke Energy (Parent) | Subsequent event | Unsecured Debt
Debt Instrument [Line Items]
Debt issuances	$ 815,000,000

Derivatives and Hedging (Notion

Derivatives and Hedging (Notional Amounts of Derivative Instruments) (Details) Mcf in Millions, $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2024 USD ($) GWh Mcf	Dec. 31, 2023 USD ($) GWh Mcf
Interest Rate Contracts
Derivative [Line Items]
Notional amount	$ 4,952	$ 5,027
Commodity contracts | Electricity (GWh)
Derivative [Line Items]
Notional amount, energy measure (in gigawatt-hours) | GWh	4,981	13,608
Commodity contracts | Natural gas (millions of dekatherms)
Derivative [Line Items]
Notional amount, volume (in millions of dekatherms) | Mcf	813	846
Designated contracts | Interest Rate Contracts
Derivative [Line Items]
Notional amount	$ 2,550	$ 2,300
Undesignated contracts | Interest Rate Contracts
Derivative [Line Items]
Notional amount	2,402	2,727
Duke Energy Carolinas | Interest Rate Contracts
Derivative [Line Items]
Notional amount	$ 850	$ 1,050
Duke Energy Carolinas | Commodity contracts | Electricity (GWh)
Derivative [Line Items]
Notional amount, energy measure (in gigawatt-hours) | GWh	0	0
Duke Energy Carolinas | Commodity contracts | Natural gas (millions of dekatherms)
Derivative [Line Items]
Notional amount, volume (in millions of dekatherms) | Mcf	266	279
Duke Energy Carolinas | Designated contracts | Interest Rate Contracts
Derivative [Line Items]
Notional amount	$ 0	$ 0
Duke Energy Carolinas | Undesignated contracts | Interest Rate Contracts
Derivative [Line Items]
Notional amount	850	1,050
Progress Energy | Interest Rate Contracts
Derivative [Line Items]
Notional amount	$ 1,325	$ 1,250
Progress Energy | Commodity contracts | Electricity (GWh)
Derivative [Line Items]
Notional amount, energy measure (in gigawatt-hours) | GWh	0	0
Progress Energy | Commodity contracts | Natural gas (millions of dekatherms)
Derivative [Line Items]
Notional amount, volume (in millions of dekatherms) | Mcf	259	274
Progress Energy | Designated contracts | Interest Rate Contracts
Derivative [Line Items]
Notional amount	$ 0	$ 0
Progress Energy | Undesignated contracts | Interest Rate Contracts
Derivative [Line Items]
Notional amount	1,325	1,250
Duke Energy Progress | Interest Rate Contracts
Derivative [Line Items]
Notional amount	$ 875	$ 925
Duke Energy Progress | Commodity contracts | Electricity (GWh)
Derivative [Line Items]
Notional amount, energy measure (in gigawatt-hours) | GWh	0	0
Duke Energy Progress | Commodity contracts | Natural gas (millions of dekatherms)
Derivative [Line Items]
Notional amount, volume (in millions of dekatherms) | Mcf	259	274
Duke Energy Progress | Designated contracts | Interest Rate Contracts
Derivative [Line Items]
Notional amount	$ 0	$ 0
Duke Energy Progress | Undesignated contracts | Interest Rate Contracts
Derivative [Line Items]
Notional amount	875	925
Duke Energy Florida | Interest Rate Contracts
Derivative [Line Items]
Notional amount	450	325
Duke Energy Florida | Designated contracts | Interest Rate Contracts
Derivative [Line Items]
Notional amount	0	0
Duke Energy Florida | Undesignated contracts | Interest Rate Contracts
Derivative [Line Items]
Notional amount	450	325
Duke Energy Indiana | Interest Rate Contracts
Derivative [Line Items]
Notional amount	$ 200	$ 400
Duke Energy Indiana | Commodity contracts | Electricity (GWh)
Derivative [Line Items]
Notional amount, energy measure (in gigawatt-hours) | GWh	4,312	11,992
Duke Energy Indiana | Commodity contracts | Natural gas (millions of dekatherms)
Derivative [Line Items]
Notional amount, volume (in millions of dekatherms) | Mcf	35	30
Duke Energy Indiana | Designated contracts | Interest Rate Contracts
Derivative [Line Items]
Notional amount	$ 0	$ 0
Duke Energy Indiana | Undesignated contracts | Interest Rate Contracts
Derivative [Line Items]
Notional amount	200	400
Duke Energy Ohio | Interest Rate Contracts
Derivative [Line Items]
Notional amount	$ 27	$ 27
Duke Energy Ohio | Commodity contracts | Electricity (GWh)
Derivative [Line Items]
Notional amount, energy measure (in gigawatt-hours) | GWh	669	1,616
Duke Energy Ohio | Commodity contracts | Natural gas (millions of dekatherms)
Derivative [Line Items]
Notional amount, volume (in millions of dekatherms) | Mcf	0	0
Duke Energy Ohio | Designated contracts | Interest Rate Contracts
Derivative [Line Items]
Notional amount	$ 0	$ 0
Duke Energy Ohio | Undesignated contracts | Interest Rate Contracts
Derivative [Line Items]
Notional amount	$ 27	$ 27
Piedmont | Commodity contracts | Electricity (GWh)
Derivative [Line Items]
Notional amount, energy measure (in gigawatt-hours) | GWh	0	0
Piedmont | Commodity contracts | Natural gas (millions of dekatherms)
Derivative [Line Items]
Notional amount, volume (in millions of dekatherms) | Mcf	253	263

Derivatives and Hedging (Foreig

Derivatives and Hedging (Foreign Exchange Risk) (Details) - Foreign Currency Contracts - Designated contracts € in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2024 USD ($)	Mar. 31, 2023 USD ($)	Mar. 31, 2024 EUR (€)
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional amount	$ 1,182
Receive notional | €			€ 1,100
Fair value gain (loss)	4	$ 10
Senior Notes, 3.10% Due June 2028
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional amount	$ 645
Pay Rate	4.75%		4.75%
Receive notional | €			€ 600
Rate	0.0310		0.0310
Fair value gain (loss)	$ 2	5
Senior Notes, 3.85% Due June 2034
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional amount	$ 537
Pay Rate	5.31%		5.31%
Receive notional | €			€ 500
Rate	0.0385		0.0385
Fair value gain (loss)	$ 2	$ 5

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	Mar. 31, 2024	Dec. 31, 2023
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	$ 255	$ 189
Location and fair value amounts of derivatives (Liability)	612	729
Current assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	95	61
Noncurrent assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	160	128
Current liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Liability)	367	409
Noncurrent liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Liability)	245	320
Commodity Contracts
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	75	82
Location and fair value amounts of derivatives (Liability)	548	609
Interest Rate Contracts
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	157	63
Location and fair value amounts of derivatives (Liability)	46	103
Foreign Currency Contracts
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	23	44
Location and fair value amounts of derivatives (Liability)	18	17
Not Designated as Hedging Instruments | Commodity Contracts | Current assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	21	25
Not Designated as Hedging Instruments | Commodity Contracts | Noncurrent assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	54	57
Not Designated as Hedging Instruments | Commodity Contracts | Current liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Liability)	335	354
Not Designated as Hedging Instruments | Commodity Contracts | Noncurrent liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Liability)	213	255
Not Designated as Hedging Instruments | Interest Rate Contracts | Current assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)		5
Not Designated as Hedging Instruments | Interest Rate Contracts | Noncurrent assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	43	10
Not Designated as Hedging Instruments | Interest Rate Contracts | Current liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Liability)		13
Not Designated as Hedging Instruments | Interest Rate Contracts | Noncurrent liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Liability)	21	39
Designated as Hedging Instruments | Interest Rate Contracts | Current assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	74
Designated as Hedging Instruments | Interest Rate Contracts | Noncurrent assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	40
Designated as Hedging Instruments | Interest Rate Contracts | Current liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)		31
Location and fair value amounts of derivatives (Liability)	14	25
Designated as Hedging Instruments | Interest Rate Contracts | Noncurrent liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)		17
Location and fair value amounts of derivatives (Liability)	11	26
Designated as Hedging Instruments | Foreign Currency Contracts | Noncurrent assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	23
Designated as Hedging Instruments | Foreign Currency Contracts | Current liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Liability)	18	17
Designated as Hedging Instruments | Foreign Currency Contracts | Noncurrent liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)		44
Duke Energy Carolinas
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	35	35
Location and fair value amounts of derivatives (Liability)	234	260
Duke Energy Carolinas | Current assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	1	6
Duke Energy Carolinas | Noncurrent assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	34	29
Duke Energy Carolinas | Current liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Liability)	175	179
Duke Energy Carolinas | Noncurrent liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Liability)	59	81
Duke Energy Carolinas | Commodity Contracts
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	26	27
Location and fair value amounts of derivatives (Liability)	228	244
Duke Energy Carolinas | Interest Rate Contracts
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	9	8
Location and fair value amounts of derivatives (Liability)	6	16
Duke Energy Carolinas | Foreign Currency Contracts
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	0	0
Location and fair value amounts of derivatives (Liability)	0	0
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)	1	1
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)	25	26
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)	175	177
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)	53	67
Duke Energy Carolinas | Not Designated as Hedging Instruments | Interest Rate Contracts | Current assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)		5
Duke Energy Carolinas | Not Designated as Hedging Instruments | Interest Rate Contracts | Noncurrent assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	9	3
Duke Energy Carolinas | Not Designated as Hedging Instruments | Interest Rate Contracts | Current liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Liability)		2
Duke Energy Carolinas | Not Designated as Hedging Instruments | Interest Rate Contracts | Noncurrent liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Liability)	6	14
Duke Energy Carolinas | Designated as Hedging Instruments | Interest Rate Contracts | Current assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	0
Duke Energy Carolinas | Designated as Hedging Instruments | Interest Rate Contracts | Noncurrent assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	0
Duke Energy Carolinas | Designated as Hedging Instruments | Interest Rate Contracts | Current liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)		0
Location and fair value amounts of derivatives (Liability)	0	0
Duke Energy Carolinas | Designated as Hedging Instruments | Interest Rate Contracts | Noncurrent liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)		0
Location and fair value amounts of derivatives (Liability)	0	0
Duke Energy Carolinas | Designated as Hedging Instruments | Foreign Currency Contracts | Noncurrent assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	0
Duke Energy Carolinas | Designated as Hedging Instruments | Foreign Currency Contracts | Current liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Liability)	0	0
Duke Energy Carolinas | Designated as Hedging Instruments | Foreign Currency Contracts | Noncurrent liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)		0
Progress Energy
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	57	34
Location and fair value amounts of derivatives (Liability)	188	234
Progress Energy | Current assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	11	3
Progress Energy | Noncurrent assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	46	31
Progress Energy | Current liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Liability)	126	149
Progress Energy | Noncurrent liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Liability)	62	85
Progress Energy | Commodity Contracts
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	40	34
Location and fair value amounts of derivatives (Liability)	174	199
Progress Energy | Interest Rate Contracts
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	17	0
Location and fair value amounts of derivatives (Liability)	14	35
Progress Energy | Foreign Currency Contracts
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	0	0
Location and fair value amounts of derivatives (Liability)	0	0
Progress Energy | Not Designated as Hedging Instruments | Commodity Contracts | Current assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	11	3
Progress Energy | Not Designated as Hedging Instruments | Commodity Contracts | Noncurrent assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	29	31
Progress Energy | Not Designated as Hedging Instruments | Commodity Contracts | Current liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Liability)	126	138
Progress Energy | Not Designated as Hedging Instruments | Commodity Contracts | Noncurrent liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Liability)	48	61
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)		0
Progress Energy | Not Designated as Hedging Instruments | Interest Rate Contracts | Noncurrent assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	17	0
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)		11
Progress Energy | Not Designated as Hedging Instruments | Interest Rate Contracts | Noncurrent liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Liability)	14	24
Progress Energy | Designated as Hedging Instruments | Interest Rate Contracts | Current assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	0
Progress Energy | Designated as Hedging Instruments | Interest Rate Contracts | Noncurrent assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	0
Progress Energy | Designated as Hedging Instruments | Interest Rate Contracts | Current liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)		0
Location and fair value amounts of derivatives (Liability)	0	0
Progress Energy | Designated as Hedging Instruments | Interest Rate Contracts | Noncurrent liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)		0
Location and fair value amounts of derivatives (Liability)	0	0
Progress Energy | Designated as Hedging Instruments | Foreign Currency Contracts | Noncurrent assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	0
Progress Energy | Designated as Hedging Instruments | Foreign Currency Contracts | Current liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Liability)	0	0
Progress Energy | Designated as Hedging Instruments | Foreign Currency Contracts | Noncurrent liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)		0
Duke Energy Progress
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	47	32
Location and fair value amounts of derivatives (Liability)	181	219
Duke Energy Progress | Current assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	1	1
Duke Energy Progress | Noncurrent assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	46	31
Duke Energy Progress | Current liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Liability)	126	149
Duke Energy Progress | Noncurrent liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Liability)	55	70
Duke Energy Progress | Commodity Contracts
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	30	32
Location and fair value amounts of derivatives (Liability)	174	199
Duke Energy Progress | Interest Rate Contracts
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	17	0
Location and fair value amounts of derivatives (Liability)	7	20
Duke Energy Progress | Foreign Currency Contracts
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	0	0
Location and fair value amounts of derivatives (Liability)	0	0
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)	1	1
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)	29	31
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)	126	138
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)	48	61
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)		0
Duke Energy Progress | Not Designated as Hedging Instruments | Interest Rate Contracts | Noncurrent assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	17	0
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)		11
Duke Energy Progress | Not Designated as Hedging Instruments | Interest Rate Contracts | Noncurrent liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Liability)	7	9
Duke Energy Progress | Designated as Hedging Instruments | Interest Rate Contracts | Current assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	0
Duke Energy Progress | Designated as Hedging Instruments | Interest Rate Contracts | Noncurrent assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	0
Duke Energy Progress | Designated as Hedging Instruments | Interest Rate Contracts | Current liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)		0
Location and fair value amounts of derivatives (Liability)	0	0
Duke Energy Progress | Designated as Hedging Instruments | Interest Rate Contracts | Noncurrent liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)		0
Location and fair value amounts of derivatives (Liability)	0	0
Duke Energy Progress | Designated as Hedging Instruments | Foreign Currency Contracts | Noncurrent assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	0
Duke Energy Progress | Designated as Hedging Instruments | Foreign Currency Contracts | Current liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Liability)	0	0
Duke Energy Progress | Designated as Hedging Instruments | Foreign Currency Contracts | Noncurrent liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)		0
Duke Energy Florida
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	10	2
Location and fair value amounts of derivatives (Liability)	7	15
Duke Energy Florida | Current assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	10	2
Duke Energy Florida | Noncurrent assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	0	0
Duke Energy Florida | Current liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Liability)	0	0
Duke Energy Florida | Noncurrent liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Liability)	7	15
Duke Energy Florida | Commodity Contracts
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	10	2
Location and fair value amounts of derivatives (Liability)	0	0
Duke Energy Florida | Interest Rate Contracts
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	0	0
Location and fair value amounts of derivatives (Liability)	7	15
Duke Energy Florida | Foreign Currency Contracts
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	0	0
Location and fair value amounts of derivatives (Liability)	0	0
Duke Energy Florida | Not Designated as Hedging Instruments | Commodity Contracts | Current assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	10	2
Duke Energy Florida | Not Designated as Hedging Instruments | Commodity Contracts | Noncurrent assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	0	0
Duke Energy Florida | Not Designated as Hedging Instruments | Commodity Contracts | Current liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Liability)	0	0
Duke Energy Florida | Not Designated as Hedging Instruments | Commodity Contracts | Noncurrent liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Liability)	0	0
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)		0
Duke Energy Florida | Not Designated as Hedging Instruments | Interest Rate Contracts | Noncurrent assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	0	0
Duke Energy Florida | Not Designated as Hedging Instruments | Interest Rate Contracts | Current liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Liability)		0
Duke Energy Florida | Not Designated as Hedging Instruments | Interest Rate Contracts | Noncurrent liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Liability)	7	15
Duke Energy Florida | Designated as Hedging Instruments | Interest Rate Contracts | Current assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	0
Duke Energy Florida | Designated as Hedging Instruments | Interest Rate Contracts | Noncurrent assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	0
Duke Energy Florida | Designated as Hedging Instruments | Interest Rate Contracts | Current liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)		0
Location and fair value amounts of derivatives (Liability)	0	0
Duke Energy Florida | Designated as Hedging Instruments | Interest Rate Contracts | Noncurrent liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)		0
Location and fair value amounts of derivatives (Liability)	0	0
Duke Energy Florida | Designated as Hedging Instruments | Foreign Currency Contracts | Noncurrent assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	0
Duke Energy Florida | Designated as Hedging Instruments | Foreign Currency Contracts | Current liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Liability)	0	0
Duke Energy Florida | Designated as Hedging Instruments | Foreign Currency Contracts | Noncurrent liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)		0
Duke Energy Ohio
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	0	1
Location and fair value amounts of derivatives (Liability)	1	1
Duke Energy Ohio | Current assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	0	1
Duke Energy Ohio | Noncurrent assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	0	0
Duke Energy Ohio | Current liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Liability)	0	0
Duke Energy Ohio | Noncurrent liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Liability)	1	1
Duke Energy Ohio | Commodity Contracts
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	0	1
Location and fair value amounts of derivatives (Liability)	0	0
Duke Energy Ohio | Interest Rate Contracts
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	0	0
Location and fair value amounts of derivatives (Liability)	1	1
Duke Energy Ohio | Foreign Currency Contracts
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	0	0
Location and fair value amounts of derivatives (Liability)	0	0
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)	0	1
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)	0	0
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)	0	0
Duke Energy Ohio | Not Designated as Hedging Instruments | Commodity Contracts | Noncurrent liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Liability)	0	0
Duke Energy Ohio | Not Designated as Hedging Instruments | Interest Rate Contracts | Current assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)		0
Duke Energy Ohio | Not Designated as Hedging Instruments | Interest Rate Contracts | Noncurrent assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	0	0
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)		0
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)	1	1
Duke Energy Ohio | Designated as Hedging Instruments | Interest Rate Contracts | Current assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	0
Duke Energy Ohio | Designated as Hedging Instruments | Interest Rate Contracts | Noncurrent assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	0
Duke Energy Ohio | Designated as Hedging Instruments | Interest Rate Contracts | Current liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)		0
Location and fair value amounts of derivatives (Liability)	0	0
Duke Energy Ohio | Designated as Hedging Instruments | Interest Rate Contracts | Noncurrent liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)		0
Location and fair value amounts of derivatives (Liability)	0	0
Duke Energy Ohio | Designated as Hedging Instruments | Foreign Currency Contracts | Noncurrent assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	0
Duke Energy Ohio | Designated as Hedging Instruments | Foreign Currency Contracts | Current liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Liability)	0	0
Duke Energy Ohio | Designated as Hedging Instruments | Foreign Currency Contracts | Noncurrent liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)		0
Duke Energy Indiana
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	24	25
Location and fair value amounts of derivatives (Liability)	19	18
Duke Energy Indiana | Current assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	7	18
Duke Energy Indiana | Noncurrent assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	17	7
Duke Energy Indiana | Current liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Liability)	19	18
Duke Energy Indiana | Noncurrent liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Liability)	0	0
Duke Energy Indiana | Commodity Contracts
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	7	18
Location and fair value amounts of derivatives (Liability)	19	18
Duke Energy Indiana | Interest Rate Contracts
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	17	7
Location and fair value amounts of derivatives (Liability)	0	0
Duke Energy Indiana | Foreign Currency Contracts
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	0	0
Location and fair value amounts of derivatives (Liability)	0	0
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)	7	18
Duke Energy Indiana | Not Designated as Hedging Instruments | Commodity Contracts | Noncurrent assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	0	0
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)	19	18
Duke Energy Indiana | Not Designated as Hedging Instruments | Commodity Contracts | Noncurrent liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Liability)	0	0
Duke Energy Indiana | Not Designated as Hedging Instruments | Interest Rate Contracts | Current assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)		0
Duke Energy Indiana | Not Designated as Hedging Instruments | Interest Rate Contracts | Noncurrent assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	17	7
Duke Energy Indiana | Not Designated as Hedging Instruments | Interest Rate Contracts | Current liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Liability)		0
Duke Energy Indiana | Not Designated as Hedging Instruments | Interest Rate Contracts | Noncurrent liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Liability)	0	0
Duke Energy Indiana | Designated as Hedging Instruments | Interest Rate Contracts | Current assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	0
Duke Energy Indiana | Designated as Hedging Instruments | Interest Rate Contracts | Noncurrent assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	0
Duke Energy Indiana | Designated as Hedging Instruments | Interest Rate Contracts | Current liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)		0
Location and fair value amounts of derivatives (Liability)	0	0
Duke Energy Indiana | Designated as Hedging Instruments | Interest Rate Contracts | Noncurrent liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)		0
Location and fair value amounts of derivatives (Liability)	0	0
Duke Energy Indiana | Designated as Hedging Instruments | Foreign Currency Contracts | Noncurrent assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	0
Duke Energy Indiana | Designated as Hedging Instruments | Foreign Currency Contracts | Current liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Liability)	0	0
Duke Energy Indiana | Designated as Hedging Instruments | Foreign Currency Contracts | Noncurrent liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)		0
Piedmont
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	1	1
Location and fair value amounts of derivatives (Liability)	126	147
Piedmont | Current assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	1	1
Piedmont | Noncurrent assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	0	0
Piedmont | Current liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Liability)	14	20
Piedmont | Noncurrent liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Liability)	112	127
Piedmont | Commodity Contracts
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	1	1
Location and fair value amounts of derivatives (Liability)	126	147
Piedmont | Interest Rate Contracts
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	0	0
Location and fair value amounts of derivatives (Liability)	0	0
Piedmont | Foreign Currency Contracts
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	0	0
Location and fair value amounts of derivatives (Liability)	0	0
Piedmont | Not Designated as Hedging Instruments | Commodity Contracts | Current assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	1	1
Piedmont | Not Designated as Hedging Instruments | Commodity Contracts | Noncurrent assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	0	0
Piedmont | Not Designated as Hedging Instruments | Commodity Contracts | Current liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Liability)	14	20
Piedmont | Not Designated as Hedging Instruments | Commodity Contracts | Noncurrent liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Liability)	112	127
Piedmont | Not Designated as Hedging Instruments | Interest Rate Contracts | Current assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)		0
Piedmont | Not Designated as Hedging Instruments | Interest Rate Contracts | Noncurrent assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	0	0
Piedmont | Not Designated as Hedging Instruments | Interest Rate Contracts | Current liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Liability)		0
Piedmont | Not Designated as Hedging Instruments | Interest Rate Contracts | Noncurrent liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Liability)	0	0
Piedmont | Designated as Hedging Instruments | Interest Rate Contracts | Current assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	0
Piedmont | Designated as Hedging Instruments | Interest Rate Contracts | Noncurrent assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	0
Piedmont | Designated as Hedging Instruments | Interest Rate Contracts | Current liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)		0
Location and fair value amounts of derivatives (Liability)	0	0
Piedmont | Designated as Hedging Instruments | Interest Rate Contracts | Noncurrent liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)		0
Location and fair value amounts of derivatives (Liability)	0	0
Piedmont | Designated as Hedging Instruments | Foreign Currency Contracts | Noncurrent assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)	0
Piedmont | Designated as Hedging Instruments | Foreign Currency Contracts | Current liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Liability)	$ 0	0
Piedmont | Designated as Hedging Instruments | Foreign Currency Contracts | Noncurrent liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives (Asset)		$ 0

Derivatives and Hedging (Schedu

Derivatives and Hedging (Schedule of Offsetting Assets) (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	$ 255	$ 189
Derivative Asset, Current	94	59
Net amounts presented in Current Assets: Other	129	91
Current assets
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	95	61
Offset	$ (1)	$ (2)
Derivative Asset, Current, Statement of Financial Position [Extensible Enumeration]	Current Assets: Other	Current Assets: Other
Noncurrent assets
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	$ 160	$ 128
Offset	$ (31)	$ (37)
Derivative Asset, Noncurrent, Statement of Financial Position [Extensible Enumeration]	Other	Other
Duke Energy Carolinas
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	$ 35	$ 35
Derivative Asset, Current	0	5
Net amounts presented in Current Assets: Other	23	15
Duke Energy Carolinas | Current assets
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	1	6
Offset	(1)	(1)
Duke Energy Carolinas | Noncurrent assets
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	34	29
Offset	(11)	(14)
Progress Energy
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	57	34
Derivative Asset, Current	10	2
Net amounts presented in Current Assets: Other	26	9
Progress Energy | Current assets
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	11	3
Offset	(1)	(1)
Progress Energy | Noncurrent assets
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	46	31
Offset	(20)	(22)
Duke Energy Progress
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	47	32
Derivative Asset, Current	0	0
Net amounts presented in Current Assets: Other	26	9
Duke Energy Progress | Current assets
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	1	1
Offset	(1)	(1)
Duke Energy Progress | Noncurrent assets
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	46	31
Offset	(20)	(22)
Duke Energy Florida
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	10	2
Derivative Asset, Current	10	2
Net amounts presented in Current Assets: Other	0	0
Duke Energy Florida | Current assets
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	10	2
Offset	0	0
Duke Energy Florida | Noncurrent assets
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	0	0
Offset	0	0
Duke Energy Ohio
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	0	1
Derivative Asset, Current	0	1
Net amounts presented in Current Assets: Other	0	0
Duke Energy Ohio | Current assets
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	0	1
Offset	0	0
Duke Energy Ohio | Noncurrent assets
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	0	0
Offset	0	0
Duke Energy Indiana
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	24	25
Derivative Asset, Current	7	18
Net amounts presented in Current Assets: Other	17	7
Duke Energy Indiana | Current assets
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	7	18
Offset	0	0
Duke Energy Indiana | Noncurrent assets
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	17	7
Offset	0	0
Piedmont
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	1	1
Derivative Asset, Current	1	1
Net amounts presented in Current Assets: Other	0	0
Piedmont | Current assets
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	1	1
Offset	0	0
Piedmont | Noncurrent assets
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	0	0
Offset	$ 0	$ 0

Derivatives and Hedging (Sche_2

Derivatives and Hedging (Schedule of Offsetting Liabilities) (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	$ 612	$ 729
Net amounts presented in Current Liabilities: Other	281	311
Net amounts presented in Current Liabilities: Other	162	217
Current liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	367	409
Offset	(1)	(2)
Cash collateral posted	$ (85)	$ (96)
Derivative Liability, Current, Statement of Financial Position [Extensible Enumeration]	Current Liabilities: Other	Current Liabilities: Other
Noncurrent liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	$ 245	$ 320
Offset	(31)	(37)
Cash collateral posted	$ (52)	$ (66)
Derivative Liability, Statement of Financial Position [Extensible Enumeration]	Other	Other
Duke Energy Carolinas
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	$ 234	$ 260
Net amounts presented in Current Liabilities: Other	135	130
Net amounts presented in Current Liabilities: Other	18	29
Duke Energy Carolinas | Current liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	175	179
Offset	(1)	(1)
Cash collateral posted	(39)	(48)
Duke Energy Carolinas | Noncurrent liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	59	81
Offset	(11)	(14)
Cash collateral posted	(30)	(38)
Progress Energy
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	188	234
Net amounts presented in Current Liabilities: Other	99	118
Net amounts presented in Current Liabilities: Other	21	35
Progress Energy | Current liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	126	149
Offset	(1)	(1)
Cash collateral posted	(26)	(30)
Progress Energy | Noncurrent liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	62	85
Offset	(20)	(22)
Cash collateral posted	(21)	(28)
Duke Energy Progress
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	181	219
Net amounts presented in Current Liabilities: Other	99	118
Net amounts presented in Current Liabilities: Other	14	20
Duke Energy Progress | Current liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	126	149
Offset	(1)	(1)
Cash collateral posted	(26)	(30)
Duke Energy Progress | Noncurrent liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	55	70
Offset	(20)	(22)
Cash collateral posted	(21)	(28)
Duke Energy Florida
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	7	15
Net amounts presented in Current Liabilities: Other	0	0
Net amounts presented in Current Liabilities: Other	7	15
Duke Energy Florida | Current liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	0	0
Offset	0	0
Cash collateral posted	0	0
Duke Energy Florida | Noncurrent liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	7	15
Offset	0	0
Cash collateral posted	0	0
Duke Energy Ohio
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	1	1
Net amounts presented in Current Liabilities: Other	0	0
Net amounts presented in Current Liabilities: Other	1	1
Duke Energy Ohio | Current liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	0	0
Offset	0	0
Cash collateral posted	0	0
Duke Energy Ohio | Noncurrent liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	1	1
Offset	0	0
Cash collateral posted	0	0
Duke Energy Indiana
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	19	18
Net amounts presented in Current Liabilities: Other	0	0
Net amounts presented in Current Liabilities: Other	0	0
Duke Energy Indiana | Current liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	19	18
Offset	0	0
Cash collateral posted	(19)	(18)
Duke Energy Indiana | Noncurrent liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	0	0
Offset	0	0
Cash collateral posted	0	0
Piedmont
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	126	147
Net amounts presented in Current Liabilities: Other	14	20
Net amounts presented in Current Liabilities: Other	112	127
Piedmont | Current liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	14	20
Offset	0	0
Cash collateral posted	0	0
Piedmont | Noncurrent liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	112	127
Offset	0	0
Cash collateral posted	$ 0	$ 0

Derivatives and Hedging (Deriva

Derivatives and Hedging (Derivative Instruments with Credit-Risk Related Contingent Features and Cash Collateral) (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Schedule of Information Regarding Derivative Instruments That Contain Credit-Risk Related Contingent Features
Aggregate fair value of derivatives in a net liability position	$ 314	$ 342
Fair value of collateral already posted	117	144
Additional cash collateral or letters of credit in the event credit risk-related contingent features were triggered	197	198
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	167	175
Fair value of collateral already posted	70	86
Additional cash collateral or letters of credit in the event credit risk-related contingent features were triggered	97	89
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	147	166
Fair value of collateral already posted	48	58
Additional cash collateral or letters of credit in the event credit risk-related contingent features were triggered	99	108
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	147	166
Fair value of collateral already posted	48	58
Additional cash collateral or letters of credit in the event credit risk-related contingent features were triggered	$ 99	$ 108

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	Mar. 31, 2024	Dec. 31, 2023
Debt Securities, Available-for-sale
Estimated Fair Value	$ 3,081
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract]
Unrealized Holding Gains	5,621	$ 5,019
Unrealized Holding Losses	191	171
Estimated Fair Value	11,252	10,603
NDTF
Cash and Cash Equivalents
Estimated Fair Value	140	133
Equity Securities, FV-NI
Gross Unrealized Holding Gains	5,553	4,942
Gross Unrealized Holding Losses	27	22
Estimated Fair Value	7,837	7,278
Debt Securities, Available-for-sale
Estimated Fair Value	2,810	2,732
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract]
Unrealized Holding Gains	5,574	4,985
Unrealized Holding Losses	178	159
Estimated Fair Value	10,787	10,143
Other Investments
Cash and Cash Equivalents
Estimated Fair Value	21	31
Equity Securities, FV-NI
Gross Unrealized Holding Gains	47	33
Gross Unrealized Holding Losses	0	0
Estimated Fair Value	173	158
Debt Securities, Available-for-sale
Estimated Fair Value	271	271
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract]
Unrealized Holding Gains	47	34
Unrealized Holding Losses	13	12
Estimated Fair Value	465	460
Duke Energy Carolinas
Debt Securities, Available-for-sale
Estimated Fair Value	1,480
Duke Energy Carolinas | NDTF
Cash and Cash Equivalents
Estimated Fair Value	81	51
Equity Securities, FV-NI
Gross Unrealized Holding Gains	3,226	2,886
Gross Unrealized Holding Losses	19	14
Estimated Fair Value	4,514	4,196
Debt Securities, Available-for-sale
Estimated Fair Value	1,480	1,438
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract]
Unrealized Holding Gains	3,232	2,904
Unrealized Holding Losses	114	99
Estimated Fair Value	6,075	5,685
Duke Energy Carolinas | Other Investments
Debt Securities, Available-for-sale
Estimated Fair Value	0
Progress Energy
Debt Securities, Available-for-sale
Estimated Fair Value	1,354
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract]
Unrealized Holding Gains	2,342	2,081
Unrealized Holding Losses	64	61
Estimated Fair Value	4,751	4,499
Progress Energy | NDTF
Cash and Cash Equivalents
Estimated Fair Value	59	82
Equity Securities, FV-NI
Gross Unrealized Holding Gains	2,327	2,056
Gross Unrealized Holding Losses	8	8
Estimated Fair Value	3,323	3,082
Debt Securities, Available-for-sale
Estimated Fair Value	1,330	1,294
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract]
Unrealized Holding Gains	2,342	2,081
Unrealized Holding Losses	64	60
Estimated Fair Value	4,712	4,458
Progress Energy | Other Investments
Cash and Cash Equivalents
Estimated Fair Value	15	18
Debt Securities, Available-for-sale
Estimated Fair Value	24	23
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract]
Unrealized Holding Gains	0	0
Unrealized Holding Losses	0	1
Estimated Fair Value	39	41
Duke Energy Progress
Debt Securities, Available-for-sale
Estimated Fair Value	1,097
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract]
Unrealized Holding Gains	2,230	1,979
Unrealized Holding Losses	51	46
Estimated Fair Value	4,357	4,089
Duke Energy Progress | NDTF
Cash and Cash Equivalents
Estimated Fair Value	48	55
Equity Securities, FV-NI
Gross Unrealized Holding Gains	2,216	1,956
Gross Unrealized Holding Losses	8	8
Estimated Fair Value	3,200	2,970
Debt Securities, Available-for-sale
Estimated Fair Value	1,097	1,050
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract]
Unrealized Holding Gains	2,230	1,979
Unrealized Holding Losses	51	46
Estimated Fair Value	4,345	4,075
Duke Energy Progress | Other Investments
Cash and Cash Equivalents
Estimated Fair Value	12	14
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract]
Unrealized Holding Gains	0	0
Unrealized Holding Losses	0	0
Estimated Fair Value	12	14
Duke Energy Florida
Debt Securities, Available-for-sale
Estimated Fair Value	257
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract]
Unrealized Holding Gains	112	102
Unrealized Holding Losses	13	15
Estimated Fair Value	393	409
Duke Energy Florida | NDTF
Cash and Cash Equivalents
Estimated Fair Value	11	27
Equity Securities, FV-NI
Gross Unrealized Holding Gains	111	100
Gross Unrealized Holding Losses	0	0
Estimated Fair Value	123	112
Debt Securities, Available-for-sale
Estimated Fair Value	233	244
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract]
Unrealized Holding Gains	112	102
Unrealized Holding Losses	13	14
Estimated Fair Value	367	383
Duke Energy Florida | Other Investments
Cash and Cash Equivalents
Estimated Fair Value	2	3
Debt Securities, Available-for-sale
Estimated Fair Value	24	23
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract]
Unrealized Holding Gains	0	0
Unrealized Holding Losses	0	1
Estimated Fair Value	26	26
Duke Energy Indiana
Debt Securities, Available-for-sale
Estimated Fair Value	63
Duke Energy Indiana | Other Investments
Cash and Cash Equivalents
Estimated Fair Value	1	1
Equity Securities, FV-NI
Gross Unrealized Holding Gains	13	4
Gross Unrealized Holding Losses	0	0
Estimated Fair Value	108	98
Debt Securities, Available-for-sale
Estimated Fair Value	63	64
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract]
Unrealized Holding Gains	13	5
Unrealized Holding Losses	1	1
Estimated Fair Value	172	163
Corporate debt securities | NDTF
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	8	12
Gross Unrealized Holding Losses	46	43
Estimated Fair Value	659	632
Corporate debt securities | Other Investments
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	0	0
Gross Unrealized Holding Losses	6	6
Estimated Fair Value	87	82
Corporate debt securities | Duke Energy Carolinas | NDTF
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	2	4
Gross Unrealized Holding Losses	37	35
Estimated Fair Value	397	390
Corporate debt securities | Progress Energy | NDTF
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	6	8
Gross Unrealized Holding Losses	9	8
Estimated Fair Value	262	242
Corporate debt securities | Duke Energy Progress | NDTF
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	5	7
Gross Unrealized Holding Losses	9	8
Estimated Fair Value	248	229
Corporate debt securities | Duke Energy Florida | NDTF
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	1	1
Gross Unrealized Holding Losses	0	0
Estimated Fair Value	14	13
Corporate debt securities | Duke Energy Indiana | Other Investments
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	0	0
Gross Unrealized Holding Losses	0	0
Estimated Fair Value	8	8
Municipal bonds | NDTF
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	4	6
Gross Unrealized Holding Losses	16	16
Estimated Fair Value	332	347
Municipal bonds | Other Investments
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	0	1
Gross Unrealized Holding Losses	1	2
Estimated Fair Value	79	77
Municipal bonds | Duke Energy Carolinas | NDTF
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	0	0
Gross Unrealized Holding Losses	4	4
Estimated Fair Value	38	50
Municipal bonds | Progress Energy | NDTF
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	4	6
Gross Unrealized Holding Losses	12	12
Estimated Fair Value	294	297
Municipal bonds | Progress Energy | Other Investments
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	0	0
Gross Unrealized Holding Losses	0	1
Estimated Fair Value	24	23
Municipal bonds | Duke Energy Progress | NDTF
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	4	6
Gross Unrealized Holding Losses	12	12
Estimated Fair Value	294	297
Municipal bonds | Duke Energy Florida | Other Investments
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	0	0
Gross Unrealized Holding Losses	0	1
Estimated Fair Value	24	23
Municipal bonds | Duke Energy Indiana | Other Investments
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	0	1
Gross Unrealized Holding Losses	1	1
Estimated Fair Value	45	46
U.S. government bonds | NDTF
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	9	24
Gross Unrealized Holding Losses	76	65
Estimated Fair Value	1,610	1,575
U.S. government bonds | Other Investments
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	0	0
Gross Unrealized Holding Losses	3	2
Estimated Fair Value	60	65
U.S. government bonds | Duke Energy Carolinas | NDTF
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	4	13
Gross Unrealized Holding Losses	41	33
Estimated Fair Value	854	826
U.S. government bonds | Progress Energy | NDTF
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	5	11
Gross Unrealized Holding Losses	35	32
Estimated Fair Value	756	749
U.S. government bonds | Duke Energy Progress | NDTF
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	5	10
Gross Unrealized Holding Losses	22	18
Estimated Fair Value	539	518
U.S. government bonds | Duke Energy Florida | NDTF
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	0	1
Gross Unrealized Holding Losses	13	14
Estimated Fair Value	217	231
U.S. government bonds | Duke Energy Indiana | Other Investments
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	0	0
Gross Unrealized Holding Losses	0	0
Estimated Fair Value	10	10
Other debt securities | NDTF
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	0	1
Gross Unrealized Holding Losses	13	13
Estimated Fair Value	209	178
Other debt securities | Other Investments
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	0	0
Gross Unrealized Holding Losses	3	2
Estimated Fair Value	45	47
Other debt securities | Duke Energy Carolinas | NDTF
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	0	1
Gross Unrealized Holding Losses	13	13
Estimated Fair Value	191	172
Other debt securities | Progress Energy | NDTF
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	0	0
Gross Unrealized Holding Losses	0	0
Estimated Fair Value	18	6
Other debt securities | Duke Energy Progress | NDTF
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	0	0
Gross Unrealized Holding Losses	0	0
Estimated Fair Value	16	6
Other debt securities | Duke Energy Florida | NDTF
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	0	0
Gross Unrealized Holding Losses	0	0
Estimated Fair Value	$ 2	$ 0

Investments in Debt and Equit_4

Investments in Debt and Equity Securities (Realized Gains and Losses) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
FV-NI:
Realized gains	$ 68	$ 26
Realized losses	18	46
AFS:
Realized gains	10	8
Realized losses	14	32
Duke Energy Carolinas
FV-NI:
Realized gains	53	18
Realized losses	6	29
AFS:
Realized gains	4	5
Realized losses	6	20
Progress Energy
FV-NI:
Realized gains	15	8
Realized losses	12	17
AFS:
Realized gains	6	3
Realized losses	8	12
Duke Energy Progress
FV-NI:
Realized gains	15	8
Realized losses	12	17
AFS:
Realized gains	6	3
Realized losses	$ 8	$ 12

Investments in Debt and Equit_5

Investments in Debt and Equity Securities (Maturities) (Details) $ in Millions	Mar. 31, 2024 USD ($)
Debt Securities, Available-for-sale [Line Items]
Due in one year or less	$ 126
Due after one through five years	715
Due after five through 10 years	614
Due after 10 years	1,626
Total	3,081
Duke Energy Carolinas
Debt Securities, Available-for-sale [Line Items]
Due in one year or less	10
Due after one through five years	245
Due after five through 10 years	359
Due after 10 years	866
Total	1,480
Progress Energy
Debt Securities, Available-for-sale [Line Items]
Due in one year or less	101
Due after one through five years	389
Due after five through 10 years	206
Due after 10 years	658
Total	1,354
Duke Energy Progress
Debt Securities, Available-for-sale [Line Items]
Due in one year or less	23
Due after one through five years	264
Due after five through 10 years	192
Due after 10 years	618
Total	1,097
Duke Energy Florida
Debt Securities, Available-for-sale [Line Items]
Due in one year or less	78
Due after one through five years	125
Due after five through 10 years	14
Due after 10 years	40
Total	257
Duke Energy Indiana
Debt Securities, Available-for-sale [Line Items]
Due in one year or less	9
Due after one through five years	18
Due after five through 10 years	11
Due after 10 years	25
Total	$ 63

Fair Value Measurements (Fair V

Fair Value Measurements (Fair Value Measurement Amounts for Assets and Liabilities) (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt securities, available-for-sale	$ 3,081
Derivative assets	255	$ 189
Total assets	11,507	10,792
Derivative liabilities	(612)	(729)
Net assets (liabilities)	10,895	10,063
NDTF
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	140	133
Estimated Fair Value	7,837	7,278
Debt securities, available-for-sale	2,810	2,732
NDTF equity securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Estimated Fair Value	7,837	7,278
Other Investments
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	21	31
Estimated Fair Value	173	158
Debt securities, available-for-sale	271	271
Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative assets	77	37
Total assets	9,136	8,484
Derivative liabilities	(51)	(60)
Net assets (liabilities)	9,085	8,424
Level 1 | NDTF
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	140	133
Debt securities, available-for-sale	873	829
Level 1 | NDTF equity securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Estimated Fair Value	7,802	7,241
Level 1 | Other Investments
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	21	31
Estimated Fair Value	173	158
Debt securities, available-for-sale	50	55
Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative assets	172	137
Total assets	2,330	2,256
Derivative liabilities	(561)	(669)
Net assets (liabilities)	1,769	1,587
Level 2 | NDTF
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	0	0
Debt securities, available-for-sale	1,937	1,903
Level 2 | NDTF equity securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Estimated Fair Value	0	0
Level 2 | Other Investments
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	0	0
Estimated Fair Value	0	0
Debt securities, available-for-sale	221	216
Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative assets	6	15
Total assets	6	15
Derivative liabilities	0	0
Net assets (liabilities)	6	15
Level 3 | NDTF
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	0	0
Debt securities, available-for-sale	0	0
Level 3 | NDTF equity securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Estimated Fair Value	0	0
Level 3 | Other Investments
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	0	0
Estimated Fair Value	0	0
Debt securities, available-for-sale	0	0
Not Categorized
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative assets	0	0
Total assets	35	37
Derivative liabilities	0	0
Net assets (liabilities)	35	37
Not Categorized | NDTF
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	0	0
Debt securities, available-for-sale	0	0
Not Categorized | NDTF equity securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Estimated Fair Value	35	37
Not Categorized | Other Investments
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	0	0
Estimated Fair Value	0	0
Debt securities, available-for-sale	0	0
Duke Energy Carolinas
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt securities, available-for-sale	1,480
Derivative assets	35	35
Total assets	6,110	5,720
Derivative liabilities	(234)	(260)
Net assets (liabilities)	5,876	5,460
Duke Energy Carolinas | NDTF
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	81	51
Estimated Fair Value	4,514	4,196
Debt securities, available-for-sale	1,480	1,438
Duke Energy Carolinas | NDTF equity securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Estimated Fair Value	4,514	4,196
Duke Energy Carolinas | Other Investments
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt securities, available-for-sale	0
Duke Energy Carolinas | Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative assets	0	0
Total assets	4,978	4,585
Derivative liabilities	0	0
Net assets (liabilities)	4,978	4,585
Duke Energy Carolinas | Level 1 | NDTF
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	81	51
Debt securities, available-for-sale	418	375
Duke Energy Carolinas | Level 1 | NDTF equity securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Estimated Fair Value	4,479	4,159
Duke Energy Carolinas | Level 1 | Other Investments
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt securities, available-for-sale	0
Duke Energy Carolinas | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative assets	35	35
Total assets	1,097	1,098
Derivative liabilities	(234)	(260)
Net assets (liabilities)	863	838
Duke Energy Carolinas | Level 2 | NDTF
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	0	0
Debt securities, available-for-sale	1,062	1,063
Duke Energy Carolinas | Level 2 | NDTF equity securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Estimated Fair Value	0	0
Duke Energy Carolinas | Level 2 | Other Investments
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt securities, available-for-sale	0
Duke Energy Carolinas | Not Categorized
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative assets	0	0
Total assets	35	37
Derivative liabilities	0	0
Net assets (liabilities)	35	37
Duke Energy Carolinas | Not Categorized | NDTF
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	0	0
Debt securities, available-for-sale	0	0
Duke Energy Carolinas | Not Categorized | NDTF equity securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Estimated Fair Value	35	37
Duke Energy Carolinas | Not Categorized | Other Investments
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt securities, available-for-sale	0
Progress Energy
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt securities, available-for-sale	1,354
Derivative assets	57	34
Total assets	4,808	4,533
Derivative liabilities	(188)	(234)
Net assets (liabilities)	4,620	4,299
Progress Energy | NDTF
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	59	82
Estimated Fair Value	3,323	3,082
Debt securities, available-for-sale	1,330	1,294
Progress Energy | NDTF equity securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Estimated Fair Value	3,323	3,082
Progress Energy | Other Investments
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	15	18
Debt securities, available-for-sale	24	23
Progress Energy | Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative assets	0	0
Total assets	3,852	3,636
Derivative liabilities	0	0
Net assets (liabilities)	3,852	3,636
Progress Energy | Level 1 | NDTF
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	59	82
Debt securities, available-for-sale	455	454
Progress Energy | Level 1 | NDTF equity securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Estimated Fair Value	3,323	3,082
Progress Energy | Level 1 | Other Investments
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	15	18
Debt securities, available-for-sale	0	0
Progress Energy | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative assets	57	34
Total assets	956	897
Derivative liabilities	(188)	(234)
Net assets (liabilities)	768	663
Progress Energy | Level 2 | NDTF
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	0	0
Debt securities, available-for-sale	875	840
Progress Energy | Level 2 | NDTF equity securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Estimated Fair Value	0	0
Progress Energy | Level 2 | Other Investments
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	0	0
Debt securities, available-for-sale	24	23
Duke Energy Progress
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt securities, available-for-sale	1,097
Derivative assets	47	32
Total assets	4,404	4,121
Derivative liabilities	(181)	(219)
Net assets (liabilities)	4,223	3,902
Duke Energy Progress | NDTF
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	48	55
Estimated Fair Value	3,200	2,970
Debt securities, available-for-sale	1,097	1,050
Duke Energy Progress | NDTF equity securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Estimated Fair Value	3,200	2,970
Duke Energy Progress | Other Investments
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	12	14
Duke Energy Progress | Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative assets	0	0
Total assets	3,540	3,305
Derivative liabilities	0	0
Net assets (liabilities)	3,540	3,305
Duke Energy Progress | Level 1 | NDTF
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	48	55
Debt securities, available-for-sale	280	266
Duke Energy Progress | Level 1 | NDTF equity securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Estimated Fair Value	3,200	2,970
Duke Energy Progress | Level 1 | Other Investments
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	12	14
Duke Energy Progress | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative assets	47	32
Total assets	864	816
Derivative liabilities	(181)	(219)
Net assets (liabilities)	683	597
Duke Energy Progress | Level 2 | NDTF
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	0	0
Debt securities, available-for-sale	817	784
Duke Energy Progress | Level 2 | NDTF equity securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Estimated Fair Value	0	0
Duke Energy Progress | Level 2 | Other Investments
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	0	0
Duke Energy Florida
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt securities, available-for-sale	257
Derivative assets	10	2
Total assets	403	411
Derivative liabilities	(7)	(15)
Net assets (liabilities)	396	396
Duke Energy Florida | NDTF
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	11	27
Estimated Fair Value	123	112
Debt securities, available-for-sale	233	244
Duke Energy Florida | NDTF equity securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Estimated Fair Value	123	112
Duke Energy Florida | Other Investments
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	2	3
Debt securities, available-for-sale	24	23
Duke Energy Florida | Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative assets	0	0
Total assets	311	330
Derivative liabilities	0	0
Net assets (liabilities)	311	330
Duke Energy Florida | Level 1 | NDTF
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	11	27
Debt securities, available-for-sale	175	188
Duke Energy Florida | Level 1 | NDTF equity securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Estimated Fair Value	123	112
Duke Energy Florida | Level 1 | Other Investments
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	2	3
Debt securities, available-for-sale	0	0
Duke Energy Florida | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative assets	10	2
Total assets	92	81
Derivative liabilities	(7)	(15)
Net assets (liabilities)	85	66
Duke Energy Florida | Level 2 | NDTF
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	0	0
Debt securities, available-for-sale	58	56
Duke Energy Florida | Level 2 | NDTF equity securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Estimated Fair Value	0	0
Duke Energy Florida | Level 2 | Other Investments
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	0	0
Debt securities, available-for-sale	24	23
Duke Energy Indiana
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt securities, available-for-sale	63
Derivative assets	24	25
Total assets	196	188
Derivative liabilities	(19)	(18)
Net assets (liabilities)	177	170
Duke Energy Indiana | Other Investments
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	1	1
Estimated Fair Value	108	98
Debt securities, available-for-sale	63	64
Duke Energy Indiana | Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative assets	2	5
Total assets	111	104
Derivative liabilities	(19)	(18)
Net assets (liabilities)	92	86
Duke Energy Indiana | Level 1 | Other Investments
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	1	1
Estimated Fair Value	108	98
Debt securities, available-for-sale	0	0
Duke Energy Indiana | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative assets	17	7
Total assets	80	71
Derivative liabilities	0	0
Net assets (liabilities)	80	71
Duke Energy Indiana | Level 2 | Other Investments
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	0	0
Estimated Fair Value	0	0
Debt securities, available-for-sale	63	64
Duke Energy Indiana | Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative assets	5	13
Total assets	5	13
Derivative liabilities	0	0
Net assets (liabilities)	5	13
Duke Energy Indiana | Level 3 | Other Investments
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	0	0
Estimated Fair Value	0	0
Debt securities, available-for-sale	0	0
Piedmont
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative assets	1	1
Derivative liabilities	(126)	(147)
Net assets (liabilities)	(125)	(146)
Piedmont | Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative assets	1	1
Derivative liabilities	0	0
Net assets (liabilities)	1	1
Piedmont | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative assets	0	0
Derivative liabilities	(126)	(147)
Net assets (liabilities)	$ (126)	$ (147)

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
	Mar. 31, 2024	Mar. 31, 2023
Derivatives (net)
Balance at beginning of period	$ 15	$ 34
Purchases, sales, issuances and settlements:
Settlements	(13)	(20)
Total gains (losses) included on the Condensed Consolidated Balance Sheet	4	(2)
Balance at end of period	6	12
Duke Energy Indiana
Derivatives (net)
Balance at beginning of period	13	29
Purchases, sales, issuances and settlements:
Settlements	(11)	(19)
Total gains (losses) included on the Condensed Consolidated Balance Sheet	3	1
Balance at end of period	$ 5	$ 11

Fair Value Measurements (Quanti

Fair Value Measurements (Quantitative Level 3 Fair Value Disclosures) (Details) $ in Millions	Mar. 31, 2024 USD ($) $ / MWh	Dec. 31, 2023 USD ($) $ / MWh	Mar. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Fair Value Measurement Inputs and Valuation Techniques
Net derivative asset (liability) | $	$ 6	$ 15	$ 12	$ 34
Duke Energy Ohio | FTRs | RTO auction pricing
Fair Value Measurement Inputs and Valuation Techniques
Net derivative asset (liability) | $	$ 1	$ 2
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)	0.17	0.36
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)	2.13	2.11
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)	0.49	0.71
Duke Energy Indiana
Fair Value Measurement Inputs and Valuation Techniques
Net derivative asset (liability) | $	$ 5	$ 13	$ 11	$ 29
Duke Energy Indiana | FTRs | RTO auction pricing
Fair Value Measurement Inputs and Valuation Techniques
Net derivative asset (liability) | $	$ 5	$ 13
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)	0	(1.05)
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)	8.95	9.64
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)	1.45	1.26

Fair Value Measurements (Other

Fair Value Measurements (Other Fair Value Disclosure) (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Book Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	$ 77,253	$ 75,252
Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	70,512	69,790
Piedmont Natural Gas and Progress Energy
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Unamortized debt discount (premium), net	1,100	1,000
Duke Energy Carolinas | Book Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	17,019	16,012
Duke Energy Carolinas | Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	15,723	15,077
Progress Energy | Book Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	24,198	23,759
Progress Energy | Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	22,505	22,553
Duke Energy Progress | Book Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	12,178	11,714
Duke Energy Progress | Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	10,824	10,595
Duke Energy Florida | Book Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	10,377	10,401
Duke Energy Florida | Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	9,888	10,123
Duke Energy Ohio | Book Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	3,939	3,518
Duke Energy Ohio | Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	3,685	3,310
Duke Energy Indiana | Book Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	4,800	4,502
Duke Energy Indiana | Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	4,437	4,230
Piedmont | Book Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	3,669	3,668
Piedmont | Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	$ 3,273	$ 3,336

Variable Interest Entities (Nar

Variable Interest Entities (Narrative) (Details) - USD ($)	1 Months Ended			3 Months Ended	12 Months Ended
	Apr. 30, 2024	Mar. 31, 2024	Nov. 30, 2021	Mar. 31, 2024	Dec. 31, 2023	Apr. 25, 2024	Apr. 01, 2024	Feb. 29, 2024
Variable Interest Entities [Line Items]
Debt issuances		$ 3,475,000,000		$ 3,475,000,000
Duke Energy Carolinas
Variable Interest Entities [Line Items]
Debt issuances		1,000,000,000		1,000,000,000
Duke Energy Progress
Variable Interest Entities [Line Items]
Debt issuances		500,000,000		500,000,000
Duke Energy Progress | Storm Recovery Bonds | Subsequent event
Variable Interest Entities [Line Items]
Debt issuances						$ 177,000,000
Duke Energy Progress | 5.404% Storm Recovery Bonds | Storm Recovery Bonds | Subsequent event
Variable Interest Entities [Line Items]
Debt issuances	$ 177,000,000
Duke Energy (Parent)
Variable Interest Entities [Line Items]
Debt issuances		1,250,000,000		1,250,000,000
Duke Energy Indiana
Variable Interest Entities [Line Items]
Debt issuances		300,000,000		300,000,000
Duke Energy Ohio
Variable Interest Entities [Line Items]
Debt issuances		425,000,000		425,000,000
VIE primary beneficiary
Variable Interest Entities [Line Items]
Variable interest entity, financial or other support, amount				0	$ 0
VIE primary beneficiary | Duke Energy Florida | DEFR Accounts Receivable Securitization Facility Maturing April 2024 | Secured Debt | Subsequent event
Variable Interest Entities [Line Items]
Repayments of debt	$ 325,000,000
VIE primary beneficiary | CRC
Variable Interest Entities [Line Items]
Repayments of debt		350,000,000
Accounts receivable from securitization		$ 0		$ 0	663,000,000			$ 682,000,000
Percent of proceeds received as cash		75%		75%
Percent of proceeds received as subordinated note		25%		25%
Minimum equity balance required by Cinergy Receivables		$ 3,000,000		$ 3,000,000
VIE primary beneficiary | CRC | Duke Energy Indiana
Variable Interest Entities [Line Items]
Accounts receivable from securitization								316,000,000
VIE primary beneficiary | CRC | Duke Energy Ohio
Variable Interest Entities [Line Items]
Accounts receivable from securitization								$ 366,000,000
VIE primary beneficiary | DECNCSF | Duke Energy Carolinas
Variable Interest Entities [Line Items]
Proceeds from issuance of senior secured bonds			$ 237,000,000
VIE primary beneficiary | DEPNCSF | Duke Energy Progress
Variable Interest Entities [Line Items]
Proceeds from issuance of senior secured bonds			$ 770,000,000
VIE primary beneficiary | DEFR | Duke Energy Florida
Variable Interest Entities [Line Items]
Accounts receivable from securitization		$ 467,000,000		$ 467,000,000	$ 532,000,000
VIE primary beneficiary | DEFR | Duke Energy Florida | Subsequent event
Variable Interest Entities [Line Items]
Accounts receivable from securitization							$ 459,000,000

Variable Interest Entities (Sch

Variable Interest Entities (Schedule of Accounts Receivable Securitizations) (Details) - USD ($)	Mar. 31, 2024	Feb. 29, 2024	Dec. 31, 2023
Variable Interest Entities [Line Items]
Long-Term Debt	$ 74,979,000,000		$ 72,452,000,000
Duke Energy Carolinas
Variable Interest Entities [Line Items]
Long-Term Debt	16,199,000,000		15,693,000,000
Duke Energy Progress
Variable Interest Entities [Line Items]
Long-Term Debt	11,955,000,000		11,492,000,000
Duke Energy Florida
Variable Interest Entities [Line Items]
Long-Term Debt	9,791,000,000		9,812,000,000
CRC | VIE primary beneficiary
Variable Interest Entities [Line Items]
Long-Term Debt	0		312,000,000
Accounts receivable from securitization	0	$ 682,000,000	663,000,000
DERF | Duke Energy Carolinas | VIE primary beneficiary
Variable Interest Entities [Line Items]
Facility size	500,000,000
Long-Term Debt	500,000,000		500,000,000
Accounts receivable from securitization	997,000,000		991,000,000
DEPR | Duke Energy Progress | VIE primary beneficiary
Variable Interest Entities [Line Items]
Facility size	400,000,000
Long-Term Debt	400,000,000		400,000,000
Accounts receivable from securitization	789,000,000		833,000,000
DEFR | Duke Energy Florida | VIE primary beneficiary
Variable Interest Entities [Line Items]
Long-Term Debt	325,000,000		325,000,000
Accounts receivable from securitization	$ 467,000,000		$ 532,000,000

Variable Interest Entities (S_2

Variable Interest Entities (Schedule of Consolidated VIEs) (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Variable Interest Entities [Line Items]
Regulatory Assets: Current	$ 3,082	$ 3,648
Current Assets: Other	359	431
Other Noncurrent Assets: Regulatory assets	13,636	13,618
Other	4,072	3,964
Current Liabilities: Other	2,084	2,319
Current maturities of long-term debt	2,274	2,800
Long-Term Debt	74,979	72,452
Inventory	4,281	4,292
Accounts payable	3,364	4,228
Duke Energy Florida
Variable Interest Entities [Line Items]
Regulatory Assets: Current	525	720
Current Assets: Other	57	51
Other Noncurrent Assets: Regulatory assets	1,895	1,883
Other	456	429
Current Liabilities: Other	332	350
Current maturities of long-term debt	586	589
Long-Term Debt	9,791	9,812
Inventory	693	674
Accounts payable	616	738
Duke Energy Carolinas
Variable Interest Entities [Line Items]
Regulatory Assets: Current	1,347	1,564
Current Assets: Other	62	31
Other Noncurrent Assets: Regulatory assets	3,850	3,916
Other	1,116	1,109
Current Liabilities: Other	617	702
Current maturities of long-term debt	520	19
Long-Term Debt	16,199	15,693
Inventory	1,478	1,484
Accounts payable	925	1,183
Duke Energy Progress
Variable Interest Entities [Line Items]
Regulatory Assets: Current	834	942
Current Assets: Other	58	72
Other Noncurrent Assets: Regulatory assets	4,631	4,546
Other	715	682
Current Liabilities: Other	429	481
Current maturities of long-term debt	73	72
Long-Term Debt	11,955	11,492
Inventory	1,294	1,227
Accounts payable	557	634
DEFPF | Duke Energy Florida | VIE primary beneficiary
Variable Interest Entities [Line Items]
Regulatory Assets: Current	59	59
Current Assets: Other	9	37
Other Noncurrent Assets: Regulatory assets	790	803
Current Liabilities: Other	2	8
Current maturities of long-term debt	59	59
Long-Term Debt	800	831
DECNCSF | Duke Energy Carolinas | VIE primary beneficiary
Variable Interest Entities [Line Items]
Regulatory Assets: Current	12	12
Current Assets: Other	5	9
Other Noncurrent Assets: Regulatory assets	193	196
Other	1	1
Current Liabilities: Other	1	10
Current maturities of long-term debt	11	3
Long-Term Debt	203	208
DEPNCSF | Duke Energy Progress | VIE primary beneficiary
Variable Interest Entities [Line Items]
Regulatory Assets: Current	39	39
Current Assets: Other	18	31
Other Noncurrent Assets: Regulatory assets	633	643
Other	4	2
Current Liabilities: Other	4	34
Current maturities of long-term debt	34	8
Long-Term Debt	663	680
DEF ProCo | Duke Energy Florida | VIE primary beneficiary
Variable Interest Entities [Line Items]
Inventory	470	462
Accounts payable	$ 179	$ 188

Variable Interest Entities (S_3

Variable Interest Entities (Schedule of Non-Consolidated VIEs) (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Variable Interest Entities [Line Items]
Receivables from affiliated companies	$ 2,253	$ 3,019
Investments in equity method unconsolidated affiliates	502	492
Other noncurrent assets	4,072	3,964
Total Assets	178,670	176,893
Other current liabilities	2,084	2,319
Other	1,352	1,393
Duke Energy Ohio
Variable Interest Entities [Line Items]
Receivables from affiliated companies	437	112
Other noncurrent assets	98	84
Total Assets	12,305	12,216
Other current liabilities	64	65
Other	87	86
Duke Energy Ohio | Affiliated Entity
Variable Interest Entities [Line Items]
Receivables from affiliated companies	3	239
Duke Energy Ohio | VIE not primary beneficiary
Variable Interest Entities [Line Items]
Investments in equity method unconsolidated affiliates	0	0
Other noncurrent assets	0	0
Total Assets	0	150
Other current liabilities	0	0
Other	0	0
Total liabilities	0	0
Net assets	0	150
Duke Energy Ohio | VIE not primary beneficiary | Affiliated Entity
Variable Interest Entities [Line Items]
Receivables from affiliated companies	0	150
Duke Energy Indiana
Variable Interest Entities [Line Items]
Receivables from affiliated companies	429	156
Other noncurrent assets	353	325
Total Assets	14,940	14,811
Other current liabilities	179	184
Other	13	0
Duke Energy Indiana | Affiliated Entity
Variable Interest Entities [Line Items]
Receivables from affiliated companies	12	197
Duke Energy Indiana | VIE not primary beneficiary
Variable Interest Entities [Line Items]
Investments in equity method unconsolidated affiliates	0	0
Other noncurrent assets	0	0
Total Assets	0	208
Other current liabilities	0	0
Other	0	0
Total liabilities	0	0
Net assets	0	208
Duke Energy Indiana | VIE not primary beneficiary | Affiliated Entity
Variable Interest Entities [Line Items]
Receivables from affiliated companies	0	208
Pipeline Investments | VIE not primary beneficiary
Variable Interest Entities [Line Items]
Investments in equity method unconsolidated affiliates	63	67
Other noncurrent assets	30	43
Total Assets	93	110
Other current liabilities	1	4
Other	6	5
Total liabilities	7	9
Net assets	86	101
Pipeline Investments | VIE not primary beneficiary | Affiliated Entity
Variable Interest Entities [Line Items]
Receivables from affiliated companies	$ 0	$ 0

Variable Interest Entities (Rec

Variable Interest Entities (Receivables Sold) (Details) - VIE not primary beneficiary - CRC - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Duke Energy Ohio
Variable Interest Entities [Line Items]
Receivables sold	$ 0	$ 361
Less: Retained interests	0	150
Net receivables sold	0	211
Duke Energy Indiana
Variable Interest Entities [Line Items]
Receivables sold	0	351
Less: Retained interests	0	208
Net receivables sold	$ 0	$ 143

Variable Interest Entities (Sal

Variable Interest Entities (Sales and Cash Flows) (Details) - VIE not primary beneficiary - CRC - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Duke Energy Ohio
Sales
Receivables sold	$ 474	$ 725
Loss recognized on sale	7	9
Cash flows
Cash proceeds from receivables sold	478	750
Return received on retained interests	4	6
Duke Energy Indiana
Sales
Receivables sold	473	942
Loss recognized on sale	6	10
Cash flows
Cash proceeds from receivables sold	523	1,028
Return received on retained interests	$ 4	$ 8

Revenue (Remaining Performance

Revenue (Remaining Performance Obligations) (Details) $ in Millions	Mar. 31, 2024 USD ($)
Progress Energy
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, amount	$ 132
Progress Energy | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-04-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, expected timing of satisfaction, period	9 months
Revenue, remaining performance obligation, amount	$ 52
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	1 year
Revenue, remaining performance obligation, amount	$ 30
Progress Energy | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, expected timing of satisfaction, period	1 year
Revenue, remaining performance obligation, amount	$ 7
Progress Energy | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2027-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, expected timing of satisfaction, period	1 year
Revenue, remaining performance obligation, amount	$ 7
Progress Energy | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2028-01-01
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
Progress Energy | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2029-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, expected timing of satisfaction, period
Revenue, remaining performance obligation, amount	$ 29
Duke Energy Progress
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, amount	$ 6
Duke Energy Progress | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-04-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, expected timing of satisfaction, period	9 months
Revenue, remaining performance obligation, amount	$ 6
Duke Energy Progress | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, expected timing of satisfaction, period	1 year
Revenue, remaining performance obligation, amount	$ 0
Duke Energy Progress | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, expected timing of satisfaction, period	1 year
Revenue, remaining performance obligation, amount	$ 0
Duke Energy Progress | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2027-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, expected timing of satisfaction, period	1 year
Revenue, remaining performance obligation, amount	$ 0
Duke Energy Progress | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2028-01-01
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	$ 0
Duke Energy Progress | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2029-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, expected timing of satisfaction, period
Revenue, remaining performance obligation, amount	$ 0
Duke Energy Florida
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, amount	$ 126
Duke Energy Florida | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-04-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, expected timing of satisfaction, period	9 months
Revenue, remaining performance obligation, amount	$ 46
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	1 year
Revenue, remaining performance obligation, amount	$ 30
Duke Energy Florida | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, expected timing of satisfaction, period	1 year
Revenue, remaining performance obligation, amount	$ 7
Duke Energy Florida | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2027-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, expected timing of satisfaction, period	1 year
Revenue, remaining performance obligation, amount	$ 7
Duke Energy Florida | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2028-01-01
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 Florida | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2029-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, expected timing of satisfaction, period
Revenue, remaining performance obligation, amount	$ 29
Duke Energy Indiana
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, amount	$ 66
Duke Energy Indiana | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-04-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, expected timing of satisfaction, period	9 months
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	1 year
Revenue, remaining performance obligation, amount	$ 17
Duke Energy Indiana | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, expected timing of satisfaction, period	1 year
Revenue, remaining performance obligation, amount	$ 17
Duke Energy Indiana | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2027-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, expected timing of satisfaction, period	1 year
Revenue, remaining performance obligation, amount	$ 15
Duke Energy Indiana | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2028-01-01
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]: 2029-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, expected timing of satisfaction, period
Revenue, remaining performance obligation, amount	$ 0
Piedmont
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, amount	$ 451
Piedmont | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-04-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, expected timing of satisfaction, period	9 months
Revenue, remaining performance obligation, amount	$ 49
Piedmont | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, expected timing of satisfaction, period	1 year
Revenue, remaining performance obligation, amount	$ 61
Piedmont | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, expected timing of satisfaction, period	1 year
Revenue, remaining performance obligation, amount	$ 51
Piedmont | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2027-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, expected timing of satisfaction, period	1 year
Revenue, remaining performance obligation, amount	$ 49
Piedmont | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2028-01-01
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	$ 46
Piedmont | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2029-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, expected timing of satisfaction, period
Revenue, remaining performance obligation, amount	$ 195

Revenue (Disaggregation of Reve

Revenue (Disaggregation of Revenue) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	$ 7,532	$ 7,101
Revenue from sources other than contracts with customers	139	175
Total operating revenues	7,671	7,276
Electric Utilities and Infrastructure
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	6,678	6,267
Total operating revenues	6,785	6,381
Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | Residential
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	3,115	2,851
Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | General
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1,934	1,831
Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | Industrial
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	822	891
Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | Wholesale
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	554	550
Electric Utilities and Infrastructure | Other revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	253	144
Gas Utilities and Infrastructure
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	847	827
Total operating revenues	879	888
Gas Utilities and Infrastructure | Gas Utilities and Infrastructure | Residential
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	520	507
Gas Utilities and Infrastructure | Gas Utilities and Infrastructure | Commercial
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	240	233
Gas Utilities and Infrastructure | Gas Utilities and Infrastructure | Industrial
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	47	47
Gas Utilities and Infrastructure | Gas Utilities and Infrastructure | Power Generation
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0
Gas Utilities and Infrastructure | Other revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	40	40
Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	7	7
Duke Energy Carolinas
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	2,352	1,921
Revenue from sources other than contracts with customers	55	13
Total operating revenues	2,407	1,934
Duke Energy Carolinas | Electric Utilities and Infrastructure
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	2,352	1,921
Duke Energy Carolinas | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | Residential
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1,058	824
Duke Energy Carolinas | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | General
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	717	588
Duke Energy Carolinas | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | Industrial
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	340	296
Duke Energy Carolinas | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | Wholesale
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	138	135
Duke Energy Carolinas | Electric Utilities and Infrastructure | Other revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	99	78
Duke Energy Carolinas | Gas Utilities and Infrastructure
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0
Duke Energy Carolinas | Gas Utilities and Infrastructure | Gas Utilities and Infrastructure | Residential
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0
Duke Energy Carolinas | Gas Utilities and Infrastructure | Gas Utilities and Infrastructure | Commercial
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0
Duke Energy Carolinas | Gas Utilities and Infrastructure | Gas Utilities and Infrastructure | Industrial
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0
Duke Energy Carolinas | Gas Utilities and Infrastructure | Gas Utilities and Infrastructure | Power Generation
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0
Duke Energy Carolinas | Gas Utilities and Infrastructure | Other revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0
Duke Energy Carolinas | Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0
Progress Energy
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	3,153	3,003
Revenue from sources other than contracts with customers	75	45
Total operating revenues	3,228	3,048
Progress Energy | Electric Utilities and Infrastructure
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	3,153	3,003
Progress Energy | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | Residential
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1,517	1,421
Progress Energy | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | General
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	866	841
Progress Energy | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | Industrial
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	266	272
Progress Energy | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | Wholesale
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	355	348
Progress Energy | Electric Utilities and Infrastructure | Other revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	149	121
Progress Energy | Gas Utilities and Infrastructure
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0
Progress Energy | Gas Utilities and Infrastructure | Gas Utilities and Infrastructure | Residential
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0
Progress Energy | Gas Utilities and Infrastructure | Gas Utilities and Infrastructure | Commercial
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0
Progress Energy | Gas Utilities and Infrastructure | Gas Utilities and Infrastructure | Industrial
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0
Progress Energy | Gas Utilities and Infrastructure | Gas Utilities and Infrastructure | Power Generation
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0
Progress Energy | Gas Utilities and Infrastructure | Other revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0
Progress Energy | Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0
Duke Energy Progress
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1,745	1,529
Revenue from sources other than contracts with customers	43	4
Total operating revenues	1,788	1,533
Duke Energy Progress | Electric Utilities and Infrastructure
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1,745	1,529
Duke Energy Progress | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | Residential
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	742	607
Duke Energy Progress | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | General
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	422	358
Duke Energy Progress | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | Industrial
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	177	177
Duke Energy Progress | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | Wholesale
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	326	319
Duke Energy Progress | Electric Utilities and Infrastructure | Other revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	78	68
Duke Energy Progress | Gas Utilities and Infrastructure
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0
Duke Energy Progress | Gas Utilities and Infrastructure | Gas Utilities and Infrastructure | Residential
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0
Duke Energy Progress | Gas Utilities and Infrastructure | Gas Utilities and Infrastructure | Commercial
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0
Duke Energy Progress | Gas Utilities and Infrastructure | Gas Utilities and Infrastructure | Industrial
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0
Duke Energy Progress | Gas Utilities and Infrastructure | Gas Utilities and Infrastructure | Power Generation
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0
Duke Energy Progress | Gas Utilities and Infrastructure | Other revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0
Duke Energy Progress | Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0
Duke Energy Florida
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1,408	1,474
Revenue from sources other than contracts with customers	28	36
Total operating revenues	1,436	1,510
Duke Energy Florida | Electric Utilities and Infrastructure
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1,408	1,474
Duke Energy Florida | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | Residential
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	775	814
Duke Energy Florida | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | General
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	444	483
Duke Energy Florida | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | Industrial
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	89	95
Duke Energy Florida | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | Wholesale
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	29	29
Duke Energy Florida | Electric Utilities and Infrastructure | Other revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	71	53
Duke Energy Florida | Gas Utilities and Infrastructure
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0
Duke Energy Florida | Gas Utilities and Infrastructure | Gas Utilities and Infrastructure | Residential
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0
Duke Energy Florida | Gas Utilities and Infrastructure | Gas Utilities and Infrastructure | Commercial
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0
Duke Energy Florida | Gas Utilities and Infrastructure | Gas Utilities and Infrastructure | Industrial
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0
Duke Energy Florida | Gas Utilities and Infrastructure | Gas Utilities and Infrastructure | Power Generation
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0
Duke Energy Florida | Gas Utilities and Infrastructure | Other revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0
Duke Energy Florida | Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0
Duke Energy Ohio
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	693	711
Revenue from sources other than contracts with customers	(15)	(2)
Total operating revenues	678	709
Duke Energy Ohio | Electric Utilities and Infrastructure
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	473	476
Duke Energy Ohio | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | Residential
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	253	234
Duke Energy Ohio | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | General
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	152	135
Duke Energy Ohio | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | Industrial
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	32	71
Duke Energy Ohio | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | Wholesale
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	14	9
Duke Energy Ohio | Electric Utilities and Infrastructure | Other revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	22	27
Duke Energy Ohio | Gas Utilities and Infrastructure
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	220	235
Duke Energy Ohio | Gas Utilities and Infrastructure | Gas Utilities and Infrastructure | Residential
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	147	162
Duke Energy Ohio | Gas Utilities and Infrastructure | Gas Utilities and Infrastructure | Commercial
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	57	58
Duke Energy Ohio | Gas Utilities and Infrastructure | Gas Utilities and Infrastructure | Industrial
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	11	9
Duke Energy Ohio | Gas Utilities and Infrastructure | Gas Utilities and Infrastructure | Power Generation
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0
Duke Energy Ohio | Gas Utilities and Infrastructure | Other revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	5	6
Duke Energy Ohio | Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0
Duke Energy Indiana
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	753	966
Revenue from sources other than contracts with customers	6	9
Total operating revenues	759	975
Duke Energy Indiana | Electric Utilities and Infrastructure
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	753	966
Duke Energy Indiana | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | Residential
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	287	372
Duke Energy Indiana | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | General
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	201	270
Duke Energy Indiana | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | Industrial
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	183	251
Duke Energy Indiana | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | Wholesale
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	48	58
Duke Energy Indiana | Electric Utilities and Infrastructure | Other revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	34	15
Duke Energy Indiana | Gas Utilities and Infrastructure
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0
Duke Energy Indiana | Gas Utilities and Infrastructure | Gas Utilities and Infrastructure | Residential
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0
Duke Energy Indiana | Gas Utilities and Infrastructure | Gas Utilities and Infrastructure | Commercial
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0
Duke Energy Indiana | Gas Utilities and Infrastructure | Gas Utilities and Infrastructure | Industrial
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0
Duke Energy Indiana | Gas Utilities and Infrastructure | Gas Utilities and Infrastructure | Power Generation
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0
Duke Energy Indiana | Gas Utilities and Infrastructure | Other revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0
Duke Energy Indiana | Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0
Piedmont
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	637	599
Revenue from sources other than contracts with customers	39	76
Total operating revenues	676	675
Piedmont | Electric Utilities and Infrastructure
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0
Piedmont | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | Residential
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0
Piedmont | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | General
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0
Piedmont | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | Industrial
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0
Piedmont | Electric Utilities and Infrastructure | Electric Utilities and Infrastructure | Wholesale
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0
Piedmont | Electric Utilities and Infrastructure | Other revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0
Piedmont | Gas Utilities and Infrastructure
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	637	599
Piedmont | Gas Utilities and Infrastructure | Gas Utilities and Infrastructure | Residential
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	373	345
Piedmont | Gas Utilities and Infrastructure | Gas Utilities and Infrastructure | Commercial
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	183	175
Piedmont | Gas Utilities and Infrastructure | Gas Utilities and Infrastructure | Industrial
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	38	37
Piedmont | Gas Utilities and Infrastructure | Gas Utilities and Infrastructure | Power Generation
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	8	23
Piedmont | Gas Utilities and Infrastructure | Other revenues
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	35	19
Piedmont | Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	$ 0	$ 0

Revenue (Reserve for Credit Los

Revenue (Reserve for Credit Losses for Trade and Other Receivables) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	$ 205	$ 216
Cumulative Change in Accounting Principle	204	214
Write-Offs	(32)	(42)
Credit Loss Expense	10	16
Other Adjustments	21	24
Ending balance	204	214
Duke Energy Carolinas
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	56	68
Cumulative Change in Accounting Principle	62	70
Write-Offs	(12)	(20)
Credit Loss Expense	7	7
Other Adjustments	11	15
Ending balance	62	70
Progress Energy
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	74	81
Cumulative Change in Accounting Principle	73	75
Write-Offs	(16)	(22)
Credit Loss Expense	9	6
Other Adjustments	6	10
Ending balance	73	75
Duke Energy Progress
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	44	44
Cumulative Change in Accounting Principle	47	45
Write-Offs	(7)	(9)
Credit Loss Expense	4	1
Other Adjustments	6	9
Ending balance	47	45
Duke Energy Florida
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	31	36
Cumulative Change in Accounting Principle	27	30
Write-Offs	(9)	(12)
Credit Loss Expense	5	5
Other Adjustments	0	1
Ending balance	27	30
Duke Energy Ohio
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	9	6
Cumulative Change in Accounting Principle	41	7
Write-Offs	0	0
Credit Loss Expense	1	1
Other Adjustments	31	0
Ending balance	41	7
Duke Energy Indiana
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	5	4
Cumulative Change in Accounting Principle	16	4
Write-Offs	0	0
Credit Loss Expense	2	0
Other Adjustments	9	0
Ending balance	16	4
Piedmont
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	11	14
Cumulative Change in Accounting Principle	12	14
Write-Offs	(1)	(1)
Credit Loss Expense	2	1
Other Adjustments	0	0
Ending balance	$ 12	$ 14

Revenue (Aging of Trade Receiva

Revenue (Aging of Trade Receivables) (Details) - USD ($) $ in Millions	Mar. 31, 2024	Feb. 29, 2024	Dec. 31, 2023
Financing Receivable, Past Due [Line Items]
Unbilled Receivables	$ 1,066		$ 1,273
Current	2,301		2,306
Deferred Payment Arrangements	115		104
Trade and Other Receivables	4,103		4,336
CRC | VIE primary beneficiary
Financing Receivable, Past Due [Line Items]
Accounts receivable from securitization	0	$ 682	663
30-60 days
Financing Receivable, Past Due [Line Items]
Trade and other receivables	95		78
60-90 days
Financing Receivable, Past Due [Line Items]
Trade and other receivables	46		47
Financial Asset, 1 to 29 Days Past Due
Financing Receivable, Past Due [Line Items]
Trade and other receivables	265		275
Financial Asset, Equal to or Greater than 90 Days Past Due
Financing Receivable, Past Due [Line Items]
Trade and other receivables	215		253
Duke Energy Carolinas
Financing Receivable, Past Due [Line Items]
Unbilled Receivables	361		399
Current	706		680
Deferred Payment Arrangements	40		34
Trade and Other Receivables	1,304		1,312
Duke Energy Carolinas | 30-60 days
Financing Receivable, Past Due [Line Items]
Trade and other receivables	33		20
Duke Energy Carolinas | 60-90 days
Financing Receivable, Past Due [Line Items]
Trade and other receivables	18		15
Duke Energy Carolinas | Financial Asset, 1 to 29 Days Past Due
Financing Receivable, Past Due [Line Items]
Trade and other receivables	82		97
Duke Energy Carolinas | Financial Asset, Equal to or Greater than 90 Days Past Due
Financing Receivable, Past Due [Line Items]
Trade and other receivables	64		67
Progress Energy
Financing Receivable, Past Due [Line Items]
Unbilled Receivables	361		401
Current	967		1,009
Deferred Payment Arrangements	39		43
Trade and Other Receivables	1,553		1,664
Progress Energy | 30-60 days
Financing Receivable, Past Due [Line Items]
Trade and other receivables	33		34
Progress Energy | 60-90 days
Financing Receivable, Past Due [Line Items]
Trade and other receivables	11		17
Progress Energy | Financial Asset, 1 to 29 Days Past Due
Financing Receivable, Past Due [Line Items]
Trade and other receivables	85		91
Progress Energy | Financial Asset, Equal to or Greater than 90 Days Past Due
Financing Receivable, Past Due [Line Items]
Trade and other receivables	57		69
Duke Energy Progress
Financing Receivable, Past Due [Line Items]
Unbilled Receivables	250		280
Current	586		612
Deferred Payment Arrangements	29		26
Trade and Other Receivables	968		1,016
Duke Energy Progress | 30-60 days
Financing Receivable, Past Due [Line Items]
Trade and other receivables	24		23
Duke Energy Progress | 60-90 days
Financing Receivable, Past Due [Line Items]
Trade and other receivables	8		10
Duke Energy Progress | Financial Asset, 1 to 29 Days Past Due
Financing Receivable, Past Due [Line Items]
Trade and other receivables	50		41
Duke Energy Progress | Financial Asset, Equal to or Greater than 90 Days Past Due
Financing Receivable, Past Due [Line Items]
Trade and other receivables	21		24
Duke Energy Florida
Financing Receivable, Past Due [Line Items]
Unbilled Receivables	111		121
Current	380		395
Deferred Payment Arrangements	10		17
Trade and Other Receivables	584		646
Duke Energy Florida | 30-60 days
Financing Receivable, Past Due [Line Items]
Trade and other receivables	9		11
Duke Energy Florida | 60-90 days
Financing Receivable, Past Due [Line Items]
Trade and other receivables	3		7
Duke Energy Florida | Financial Asset, 1 to 29 Days Past Due
Financing Receivable, Past Due [Line Items]
Trade and other receivables	35		50
Duke Energy Florida | Financial Asset, Equal to or Greater than 90 Days Past Due
Financing Receivable, Past Due [Line Items]
Trade and other receivables	36		45
Duke Energy Ohio
Financing Receivable, Past Due [Line Items]
Unbilled Receivables	113		4
Current	215		48
Deferred Payment Arrangements	28		6
Trade and Other Receivables	478		121
Duke Energy Ohio | CRC
Financing Receivable, Past Due [Line Items]
Unbilled Receivables			141
Duke Energy Ohio | CRC | VIE primary beneficiary
Financing Receivable, Past Due [Line Items]
Accounts receivable from securitization		366
Duke Energy Ohio | 30-60 days
Financing Receivable, Past Due [Line Items]
Trade and other receivables	15		3
Duke Energy Ohio | 60-90 days
Financing Receivable, Past Due [Line Items]
Trade and other receivables	7		2
Duke Energy Ohio | Financial Asset, 1 to 29 Days Past Due
Financing Receivable, Past Due [Line Items]
Trade and other receivables	33		12
Duke Energy Ohio | Financial Asset, Equal to or Greater than 90 Days Past Due
Financing Receivable, Past Due [Line Items]
Trade and other receivables	67		46
Duke Energy Indiana
Financing Receivable, Past Due [Line Items]
Unbilled Receivables	174		22
Current	192		87
Deferred Payment Arrangements	7		0
Trade and Other Receivables	445		161
Duke Energy Indiana | CRC
Financing Receivable, Past Due [Line Items]
Unbilled Receivables			197
Duke Energy Indiana | CRC | VIE primary beneficiary
Financing Receivable, Past Due [Line Items]
Accounts receivable from securitization		$ 316
Duke Energy Indiana | 30-60 days
Financing Receivable, Past Due [Line Items]
Trade and other receivables	7		7
Duke Energy Indiana | 60-90 days
Financing Receivable, Past Due [Line Items]
Trade and other receivables	3		4
Duke Energy Indiana | Financial Asset, 1 to 29 Days Past Due
Financing Receivable, Past Due [Line Items]
Trade and other receivables	39		14
Duke Energy Indiana | Financial Asset, Equal to or Greater than 90 Days Past Due
Financing Receivable, Past Due [Line Items]
Trade and other receivables	23		27
Piedmont
Financing Receivable, Past Due [Line Items]
Unbilled Receivables	57		108
Current	208		199
Deferred Payment Arrangements	1		0
Trade and Other Receivables	309		322
Piedmont | 30-60 days
Financing Receivable, Past Due [Line Items]
Trade and other receivables	7		2
Piedmont | 60-90 days
Financing Receivable, Past Due [Line Items]
Trade and other receivables	7		1
Piedmont | Financial Asset, 1 to 29 Days Past Due
Financing Receivable, Past Due [Line Items]
Trade and other receivables	25		9
Piedmont | Financial Asset, Equal to or Greater than 90 Days Past Due
Financing Receivable, Past Due [Line Items]
Trade and other receivables	$ 4		$ 3

Stockholders' Equity (Earnings

Stockholders' Equity (Earnings Per Share Data) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Class of Stock [Line Items]
Net Income Available to Duke Energy Corporation Common Stockholders	$ 1,099	$ 765
Accumulated preferred stock dividends adjustment	12	12
Less: Impact of participating securities	2	1
Income from continuing operations available to Duke Energy common stockholders	1,112	921
Loss from discontinued operations, net of tax	(3)	(209)
Add: Net loss attributable to noncontrolling interest included in discontinued operations	0	64
Discontinued operations	$ (3)	$ (145)
Weighted average common shares outstanding – basic (in shares)	771	770
Weighted average common shares outstanding – diluted (in shares)	771	770
Basic (in usd per share)	$ 1.44	$ 1.20
Diluted (in usd per share)	1.44	1.20
EPS from continuing operations available to Duke Energy common stockholders
Basic (usd per share)	0	(0.19)
Diluted (usd per share)	$ 0	$ (0.19)
Potentially dilutive items excluded from the calculation (in shares)	2	2
Common Stock
EPS from continuing operations available to Duke Energy common stockholders
Dividends declared per common share (in usd per share)	$ 1.025	$ 1.005
Preferred stock, Series A
EPS from continuing operations available to Duke Energy common stockholders
Dividends declared on preferred stock per depositary share (in usd per share)	$ 0.359	0.359
Cumulative dividend rate per annum	5.75%
Liquidation preference per share (in usd per share)	$ 25
Preferred stock, Series B
EPS from continuing operations available to Duke Energy common stockholders
Dividends declared on preferred stock per depositary share (in usd per share)	$ 24.375	$ 24.375
Cumulative dividend rate per annum	4.875%
Liquidation preference per share (in usd per share)	$ 1,000

Stockholders' Equity (Common St

Stockholders' Equity (Common Stock) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Billions	1 Months Ended
	Mar. 31, 2024	Nov. 30, 2022
Forward Contract Indexed to Issuer's Equity [Line Items]
Maximum value of shares to be issued under ATM program		$ 1.5
If net share settlement was elected | Equity forwards
Forward Contract Indexed to Issuer's Equity [Line Items]
Shares offered (in shares)	0.8
Forward contract indexed to issuer's equity, forward rate per share (in dollars per share)	$ 92.77

Employee Benefit Plans (Compone

Employee Benefit Plans (Components of Net Periodic Pension Costs) (Details) - Qualified Pension Plans - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	$ 28	$ 30
Interest cost on projected benefit obligation	82	86
Expected return on plan assets	(154)	(147)
Amortization of actuarial loss	8	2
Amortization of prior service credit	(3)	(3)
Amortization of settlement charges	5	5
Net periodic pension costs	(34)	(27)
Duke Energy Carolinas
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	9	10
Interest cost on projected benefit obligation	20	21
Expected return on plan assets	(41)	(40)
Amortization of actuarial loss	2	0
Amortization of prior service credit	0	0
Amortization of settlement charges	2	2
Net periodic pension costs	(8)	(7)
Progress Energy
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	8	9
Interest cost on projected benefit obligation	26	27
Expected return on plan assets	(54)	(50)
Amortization of actuarial loss	2	1
Amortization of prior service credit	0	0
Amortization of settlement charges	1	1
Net periodic pension costs	(17)	(12)
Duke Energy Progress
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	5	5
Interest cost on projected benefit obligation	12	12
Expected return on plan assets	(25)	(23)
Amortization of actuarial loss	1	0
Amortization of prior service credit	0	0
Amortization of settlement charges	1	1
Net periodic pension costs	(6)	(5)
Duke Energy Florida
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	3	3
Interest cost on projected benefit obligation	14	14
Expected return on plan assets	(29)	(26)
Amortization of actuarial loss	1	1
Amortization of prior service credit	0	0
Amortization of settlement charges	0	0
Net periodic pension costs	(11)	(8)
Duke Energy Ohio
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	1	1
Interest cost on projected benefit obligation	4	4
Expected return on plan assets	(6)	(6)
Amortization of actuarial loss	0	0
Amortization of prior service credit	0	0
Amortization of settlement charges	0	0
Net periodic pension costs	(1)	(1)
Duke Energy Indiana
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	2	1
Interest cost on projected benefit obligation	6	7
Expected return on plan assets	(10)	(10)
Amortization of actuarial loss	1	1
Amortization of prior service credit	0	0
Amortization of settlement charges	0	0
Net periodic pension costs	(1)	(1)
Piedmont
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	1	1
Interest cost on projected benefit obligation	2	2
Expected return on plan assets	(5)	(5)
Amortization of actuarial loss	1	0
Amortization of prior service credit	(2)	(2)
Amortization of settlement charges	1	1
Net periodic pension costs	$ (2)	$ (3)

Income Taxes (Narrative) (Detai

Income Taxes (Narrative) (Details) $ in Millions	Mar. 31, 2024 USD ($)
Duke Energy Carolinas
Tax Credit Carryforward [Line Items]
Deferred tax asset	$ 107
Duke Energy Progress
Tax Credit Carryforward [Line Items]
Deferred tax asset	$ 14

Income Taxes (Effective Tax Rat

Income Taxes (Effective Tax Rates) (Details)	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
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	13.40%	13.80%
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	11.50%	11.40%
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	16.50%	16.70%
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	15%	14.60%
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	19.40%	19.90%
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	16.80%	16.70%
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	17.30%	17.20%
Piedmont
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%	17.70%