Employee Benefit Plans (Amounts Recognized in Consolidated Balance Sheets) (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Amounts Recognized in Consolidated Balance Sheets [Abstract]
Noncurrent pension liability	$ 832	$ 855
Regulatory assets	18,130	14,637
Regulatory liabilities	15,048	17,363
Duke Energy Carolinas
Amounts Recognized in Consolidated Balance Sheets [Abstract]
Noncurrent pension liability	38	50
Regulatory assets	5,388	3,479
Regulatory liabilities	6,313	7,685
Progress Energy
Amounts Recognized in Consolidated Balance Sheets [Abstract]
Noncurrent pension liability	292	417
Regulatory assets	8,979	6,939
Regulatory liabilities	5,329	6,044
Duke Energy Progress
Amounts Recognized in Consolidated Balance Sheets [Abstract]
Noncurrent pension liability	160	221
Regulatory assets	5,414	4,651
Regulatory liabilities	4,452	5,249
Duke Energy Florida
Amounts Recognized in Consolidated Balance Sheets [Abstract]
Noncurrent pension liability	111	166
Regulatory assets	3,565	2,288
Regulatory liabilities	877	796
Duke Energy Ohio
Amounts Recognized in Consolidated Balance Sheets [Abstract]
Noncurrent pension liability	90	109
Regulatory assets	684	707
Regulatory liabilities	633	801
Duke Energy Indiana
Amounts Recognized in Consolidated Balance Sheets [Abstract]
Noncurrent pension liability	122	167
Regulatory assets	1,124	1,555
Regulatory liabilities	1,641	1,692
Piedmont
Amounts Recognized in Consolidated Balance Sheets [Abstract]
Noncurrent pension liability	7	7
Regulatory assets	511	457
Regulatory liabilities	1,098	1,114
Pension Plan | Qualified Plan
Amounts Recognized in Consolidated Balance Sheets [Abstract]
Prefunded pension	885	1,071
Noncurrent pension liability	250	43
Net amount recognized	(635)	(1,028)
Regulatory assets	2,016	1,649
Accumulated other comprehensive (income) loss
Deferred income tax asset	(27)	(20)
Prior service credit	(1)	(1)
Net actuarial loss (gain)	129	92
Net amount recognized in accumulated other comprehensive income (loss)	101	71
Pension Plan | Duke Energy Carolinas | Qualified Plan
Amounts Recognized in Consolidated Balance Sheets [Abstract]
Prefunded pension	261	462
Net amount recognized	(261)	(462)
Regulatory assets	545	324
Pension Plan | Progress Energy | Qualified Plan
Amounts Recognized in Consolidated Balance Sheets [Abstract]
Prefunded pension	396	494
Noncurrent pension liability		1
Net amount recognized	(396)	(493)
Regulatory assets	670	563
Accumulated other comprehensive (income) loss
Deferred income tax asset	(1)
Net actuarial loss (gain)	3	1
Net amount recognized in accumulated other comprehensive income (loss)	2	1
Pension Plan | Duke Energy Progress | Qualified Plan
Amounts Recognized in Consolidated Balance Sheets [Abstract]
Prefunded pension	174	268
Net amount recognized	(174)	(268)
Regulatory assets	353	252
Pension Plan | Duke Energy Florida | Qualified Plan
Amounts Recognized in Consolidated Balance Sheets [Abstract]
Prefunded pension	216	219
Noncurrent pension liability		1
Net amount recognized	(216)	(218)
Regulatory assets	316	311
Pension Plan | Duke Energy Ohio | Qualified Plan
Amounts Recognized in Consolidated Balance Sheets [Abstract]
Prefunded pension	62	74
Noncurrent pension liability	72	86
Net amount recognized	10	12
Regulatory assets	92	93
Pension Plan | Duke Energy Indiana | Qualified Plan
Amounts Recognized in Consolidated Balance Sheets [Abstract]
Prefunded pension	90	100
Noncurrent pension liability	88	111
Net amount recognized	(2)	11
Regulatory assets	178	190
Pension Plan | Piedmont | Qualified Plan
Amounts Recognized in Consolidated Balance Sheets [Abstract]
Prefunded pension	33	61
Net amount recognized	(33)	(61)
Regulatory assets	84	75
Other Post-Retirement Benefit Plans
Amounts Recognized in Consolidated Balance Sheets [Abstract]
Prefunded pension		12
Current pension liability	9	9
Noncurrent pension liability	266	417
Net amount recognized	275	414
Regulatory assets	50	129
Regulatory liabilities	189	162
Accumulated other comprehensive (income) loss
Deferred income tax liability	3	3
Prior service credit	(1)	(1)
Net actuarial loss (gain)	(13)	(14)
Net amount recognized in accumulated other comprehensive income (loss)	(11)	(12)
Other Post-Retirement Benefit Plans | Duke Energy Carolinas
Amounts Recognized in Consolidated Balance Sheets [Abstract]
Noncurrent pension liability	7	14
Net amount recognized	7	14
Regulatory liabilities	44	44
Other Post-Retirement Benefit Plans | Progress Energy
Amounts Recognized in Consolidated Balance Sheets [Abstract]
Current pension liability	5	5
Noncurrent pension liability	163	259
Net amount recognized	168	264
Regulatory assets	46	126
Other Post-Retirement Benefit Plans | Duke Energy Progress
Amounts Recognized in Consolidated Balance Sheets [Abstract]
Current pension liability	3	3
Noncurrent pension liability	94	146
Net amount recognized	97	149
Regulatory assets	34	79
Other Post-Retirement Benefit Plans | Duke Energy Florida
Amounts Recognized in Consolidated Balance Sheets [Abstract]
Current pension liability	2	2
Noncurrent pension liability	69	112
Net amount recognized	71	114
Regulatory assets	11	47
Other Post-Retirement Benefit Plans | Duke Energy Ohio
Amounts Recognized in Consolidated Balance Sheets [Abstract]
Prefunded pension	1	1
Current pension liability	2	1
Noncurrent pension liability	12	16
Net amount recognized	13	16
Regulatory assets	4	4
Regulatory liabilities	21	21
Other Post-Retirement Benefit Plans | Duke Energy Indiana
Amounts Recognized in Consolidated Balance Sheets [Abstract]
Noncurrent pension liability	27	48
Net amount recognized	27	48
Regulatory assets	25	28
Regulatory liabilities	82	63
Other Post-Retirement Benefit Plans | Piedmont
Amounts Recognized in Consolidated Balance Sheets [Abstract]
Prefunded pension	10	12
Net amount recognized	$ (10)	(12)
Regulatory liabilities		$ 5