Revenue (Aging of Trade Receivables) (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Financing Receivable, Past Due [Line Items]
Unbilled Receivables	$ 1,070	$ 1,457
Current	2,018	2,347
Deferred Payment Arrangements	144	160
Trade and Other Receivables	3,884	4,631
30-60 days
Financing Receivable, Past Due [Line Items]
Trade and other receivables	148	123
60-90 days
Financing Receivable, Past Due [Line Items]
Trade and other receivables	33	74
Financial Asset, 1 to 29 Days Past Due
Financing Receivable, Past Due [Line Items]
Trade and other receivables	254	261
Financial Asset, Equal to or Greater than 90 Days Past Due
Financing Receivable, Past Due [Line Items]
Trade and other receivables	217	209
Duke Energy Carolinas
Financing Receivable, Past Due [Line Items]
Unbilled Receivables	408	486
Current	519	577
Deferred Payment Arrangements	46	57
Trade and Other Receivables	1,138	1,334
Duke Energy Carolinas | 30-60 days
Financing Receivable, Past Due [Line Items]
Trade and other receivables	32	23
Duke Energy Carolinas | 60-90 days
Financing Receivable, Past Due [Line Items]
Trade and other receivables	9	25
Duke Energy Carolinas | Financial Asset, 1 to 29 Days Past Due
Financing Receivable, Past Due [Line Items]
Trade and other receivables	64	96
Duke Energy Carolinas | Financial Asset, Equal to or Greater than 90 Days Past Due
Financing Receivable, Past Due [Line Items]
Trade and other receivables	60	70
Progress Energy
Financing Receivable, Past Due [Line Items]
Unbilled Receivables	284	355
Current	892	1,059
Deferred Payment Arrangements	51	62
Trade and Other Receivables	1,491	1,689
Progress Energy | 30-60 days
Financing Receivable, Past Due [Line Items]
Trade and other receivables	83	61
Progress Energy | 60-90 days
Financing Receivable, Past Due [Line Items]
Trade and other receivables	13	18
Progress Energy | Financial Asset, 1 to 29 Days Past Due
Financing Receivable, Past Due [Line Items]
Trade and other receivables	103	60
Progress Energy | Financial Asset, Equal to or Greater than 90 Days Past Due
Financing Receivable, Past Due [Line Items]
Trade and other receivables	65	74
Duke Energy Progress
Financing Receivable, Past Due [Line Items]
Unbilled Receivables	178	232
Current	476	637
Deferred Payment Arrangements	32	35
Trade and Other Receivables	858	1,004
Duke Energy Progress | 30-60 days
Financing Receivable, Past Due [Line Items]
Trade and other receivables	72	49
Duke Energy Progress | 60-90 days
Financing Receivable, Past Due [Line Items]
Trade and other receivables	8	9
Duke Energy Progress | Financial Asset, 1 to 29 Days Past Due
Financing Receivable, Past Due [Line Items]
Trade and other receivables	68	15
Duke Energy Progress | Financial Asset, Equal to or Greater than 90 Days Past Due
Financing Receivable, Past Due [Line Items]
Trade and other receivables	24	27
Duke Energy Florida
Financing Receivable, Past Due [Line Items]
Unbilled Receivables	106	123
Current	414	417
Deferred Payment Arrangements	19	27
Trade and Other Receivables	631	680
Duke Energy Florida | 30-60 days
Financing Receivable, Past Due [Line Items]
Trade and other receivables	11	12
Duke Energy Florida | 60-90 days
Financing Receivable, Past Due [Line Items]
Trade and other receivables	5	9
Duke Energy Florida | Financial Asset, 1 to 29 Days Past Due
Financing Receivable, Past Due [Line Items]
Trade and other receivables	35	45
Duke Energy Florida | Financial Asset, Equal to or Greater than 90 Days Past Due
Financing Receivable, Past Due [Line Items]
Trade and other receivables	41	47
Duke Energy Ohio
Financing Receivable, Past Due [Line Items]
Unbilled Receivables	3	20
Current	14	15
Deferred Payment Arrangements	4	4
Trade and Other Receivables	81	79
Duke Energy Ohio | CRC
Financing Receivable, Past Due [Line Items]
Unbilled Receivables	103	148
Duke Energy Ohio | 30-60 days
Financing Receivable, Past Due [Line Items]
Trade and other receivables	5	6
Duke Energy Ohio | 60-90 days
Financing Receivable, Past Due [Line Items]
Trade and other receivables	2	3
Duke Energy Ohio | Financial Asset, 1 to 29 Days Past Due
Financing Receivable, Past Due [Line Items]
Trade and other receivables	5	5
Duke Energy Ohio | Financial Asset, Equal to or Greater than 90 Days Past Due
Financing Receivable, Past Due [Line Items]
Trade and other receivables	48	26
Duke Energy Indiana
Financing Receivable, Past Due [Line Items]
Unbilled Receivables	20	28
Current	46	52
Trade and Other Receivables	94	116
Duke Energy Indiana | CRC
Financing Receivable, Past Due [Line Items]
Unbilled Receivables	195	260
Duke Energy Indiana | 30-60 days
Financing Receivable, Past Due [Line Items]
Trade and other receivables	2	2
Duke Energy Indiana | 60-90 days
Financing Receivable, Past Due [Line Items]
Trade and other receivables	1	11
Duke Energy Indiana | Financial Asset, 1 to 29 Days Past Due
Financing Receivable, Past Due [Line Items]
Trade and other receivables	9	17
Duke Energy Indiana | Financial Asset, Equal to or Greater than 90 Days Past Due
Financing Receivable, Past Due [Line Items]
Trade and other receivables	16	6
Piedmont
Financing Receivable, Past Due [Line Items]
Unbilled Receivables	57	160
Current	168	265
Deferred Payment Arrangements	1	1
Trade and Other Receivables	259	450
Piedmont | 30-60 days
Financing Receivable, Past Due [Line Items]
Trade and other receivables	10	3
Piedmont | 60-90 days
Financing Receivable, Past Due [Line Items]
Trade and other receivables	2	2
Piedmont | Financial Asset, 1 to 29 Days Past Due
Financing Receivable, Past Due [Line Items]
Trade and other receivables	18	15
Piedmont | Financial Asset, Equal to or Greater than 90 Days Past Due
Financing Receivable, Past Due [Line Items]
Trade and other receivables	$ 3	$ 4