Employee Benefit Plans (Amounts Recognized in Consolidated Balance Sheets) (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Amounts Recognized in Consolidated Balance Sheets [Abstract]
Noncurrent pension liability	$ 485	$ 832
Regulatory assets	17,266	18,130
Regulatory liabilities	15,408	15,048
Duke Energy Carolinas
Amounts Recognized in Consolidated Balance Sheets [Abstract]
Noncurrent pension liability	57	38
Regulatory assets	5,480	5,388
Regulatory liabilities	6,577	6,313
Progress Energy
Amounts Recognized in Consolidated Balance Sheets [Abstract]
Noncurrent pension liability	266	292
Regulatory assets	8,091	8,979
Regulatory liabilities	5,501	5,329
Duke Energy Progress
Amounts Recognized in Consolidated Balance Sheets [Abstract]
Noncurrent pension liability	146	160
Regulatory assets	5,488	5,414
Regulatory liabilities	4,675	4,452
Duke Energy Florida
Amounts Recognized in Consolidated Balance Sheets [Abstract]
Noncurrent pension liability	98	111
Regulatory assets	2,603	3,565
Regulatory liabilities	826	877
Duke Energy Ohio
Amounts Recognized in Consolidated Balance Sheets [Abstract]
Noncurrent pension liability	97	90
Regulatory assets	749	684
Regulatory liabilities	553	633
Duke Energy Indiana
Amounts Recognized in Consolidated Balance Sheets [Abstract]
Noncurrent pension liability	115	122
Regulatory assets	996	1,124
Regulatory liabilities	1,668	1,641
Piedmont
Amounts Recognized in Consolidated Balance Sheets [Abstract]
Noncurrent pension liability	8	7
Regulatory assets	571	511
Regulatory liabilities	1,086	1,098
Pension Plan
Amounts Recognized in Consolidated Balance Sheets [Abstract]
Prefunded pension	863	885
Noncurrent pension liability		250
Net asset (liability) recognized	(863)	(635)
Regulatory assets	2,021	2,016
Accumulated other comprehensive (income) loss
Deferred income tax benefit	(27)	(27)
Prior service credit	(1)	(1)
Net actuarial gain	127	129
Net amounts recognized in accumulated other comprehensive income	99	101
Pension Plan | Duke Energy Carolinas
Amounts Recognized in Consolidated Balance Sheets [Abstract]
Prefunded pension	339	261
Net asset (liability) recognized	(339)	(261)
Regulatory assets	531	545
Pension Plan | Progress Energy
Amounts Recognized in Consolidated Balance Sheets [Abstract]
Prefunded pension	463	396
Net asset (liability) recognized	(463)	(396)
Regulatory assets	678	670
Accumulated other comprehensive (income) loss
Deferred income tax benefit	(1)	(1)
Net actuarial gain	3	3
Net amounts recognized in accumulated other comprehensive income	2	2
Pension Plan | Duke Energy Progress
Amounts Recognized in Consolidated Balance Sheets [Abstract]
Prefunded pension	209	174
Net asset (liability) recognized	(209)	(174)
Regulatory assets	353	353
Pension Plan | Duke Energy Florida
Amounts Recognized in Consolidated Balance Sheets [Abstract]
Prefunded pension	247	216
Net asset (liability) recognized	(247)	(216)
Regulatory assets	325	316
Pension Plan | Duke Energy Ohio
Amounts Recognized in Consolidated Balance Sheets [Abstract]
Prefunded pension	74	62
Noncurrent pension liability	73	72
Net asset (liability) recognized	(1)	10
Regulatory assets	89	92
Pension Plan | Duke Energy Indiana
Amounts Recognized in Consolidated Balance Sheets [Abstract]
Prefunded pension	105	90
Noncurrent pension liability	87	88
Net asset (liability) recognized	(18)	(2)
Regulatory assets	176	178
Accumulated other comprehensive (income) loss
Net actuarial gain	2
Net amounts recognized in accumulated other comprehensive income	2
Pension Plan | Piedmont
Amounts Recognized in Consolidated Balance Sheets [Abstract]
Prefunded pension	38	33
Net asset (liability) recognized	(38)	(33)
Regulatory assets	97	84
Other Post-Retirement Benefit Plans
Amounts Recognized in Consolidated Balance Sheets [Abstract]
Current pension liability	12	9
Noncurrent pension liability	179	266
Net asset (liability) recognized	191	275
Regulatory assets	123	50
Regulatory liabilities	230	189
Accumulated other comprehensive (income) loss
Deferred income tax expense	3	3
Prior service credit		(1)
Net actuarial gain	(13)	(13)
Net amounts recognized in accumulated other comprehensive income	(10)	(11)
Other Post-Retirement Benefit Plans | Duke Energy Carolinas
Amounts Recognized in Consolidated Balance Sheets [Abstract]
Prefunded pension	61
Current pension liability	3
Noncurrent pension liability	25	7
Net asset (liability) recognized	(33)	7
Regulatory assets	79
Regulatory liabilities	106	44
Other Post-Retirement Benefit Plans | Progress Energy
Amounts Recognized in Consolidated Balance Sheets [Abstract]
Current pension liability	5	5
Noncurrent pension liability	142	163
Net asset (liability) recognized	147	168
Regulatory assets	39	46
Accumulated other comprehensive (income) loss
Net actuarial gain	(1)
Net amounts recognized in accumulated other comprehensive income	(1)
Other Post-Retirement Benefit Plans | Duke Energy Progress
Amounts Recognized in Consolidated Balance Sheets [Abstract]
Current pension liability	3	3
Noncurrent pension liability	82	94
Net asset (liability) recognized	85	97
Regulatory assets	29	34
Other Post-Retirement Benefit Plans | Duke Energy Florida
Amounts Recognized in Consolidated Balance Sheets [Abstract]
Current pension liability	2	2
Noncurrent pension liability	59	69
Net asset (liability) recognized	61	71
Regulatory assets	11	11
Other Post-Retirement Benefit Plans | Duke Energy Ohio
Amounts Recognized in Consolidated Balance Sheets [Abstract]
Prefunded pension	1	1
Current pension liability	1	2
Noncurrent pension liability	12	12
Net asset (liability) recognized	12	13
Regulatory assets	2	4
Regulatory liabilities	17	21
Other Post-Retirement Benefit Plans | Duke Energy Indiana
Amounts Recognized in Consolidated Balance Sheets [Abstract]
Noncurrent pension liability	21	27
Net asset (liability) recognized	21	27
Regulatory assets	23	25
Regulatory liabilities	74	82
Other Post-Retirement Benefit Plans | Piedmont
Amounts Recognized in Consolidated Balance Sheets [Abstract]
Prefunded pension	12	10
Net asset (liability) recognized	(12)	$ (10)
Regulatory assets	$ 1