Revenue (Aging of Trade Receivables) (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Financing Receivable, Past Due [Line Items]
Unbilled Receivables	$ 977	$ 1,457
Current	2,538	2,347
Deferred Payment Arrangements	104	160
Trade and Other Receivables	4,278	4,631
30-60 days
Financing Receivable, Past Due [Line Items]
Trade and other receivables	114	123
60-90 days
Financing Receivable, Past Due [Line Items]
Trade and other receivables	53	74
Financial Asset, 1 to 29 Days Past Due
Financing Receivable, Past Due [Line Items]
Trade and other receivables	258	261
Financial Asset, Equal to or Greater than 90 Days Past Due
Financing Receivable, Past Due [Line Items]
Trade and other receivables	234	209
Duke Energy Carolinas
Financing Receivable, Past Due [Line Items]
Unbilled Receivables	356	486
Current	795	577
Deferred Payment Arrangements	31	57
Trade and Other Receivables	1,363	1,334
Duke Energy Carolinas | 30-60 days
Financing Receivable, Past Due [Line Items]
Trade and other receivables	31	23
Duke Energy Carolinas | 60-90 days
Financing Receivable, Past Due [Line Items]
Trade and other receivables	19	25
Duke Energy Carolinas | Financial Asset, 1 to 29 Days Past Due
Financing Receivable, Past Due [Line Items]
Trade and other receivables	71	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	333	355
Current	1,233	1,059
Deferred Payment Arrangements	50	62
Trade and Other Receivables	1,886	1,689
Progress Energy | 30-60 days
Financing Receivable, Past Due [Line Items]
Trade and other receivables	57	61
Progress Energy | 60-90 days
Financing Receivable, Past Due [Line Items]
Trade and other receivables	21	18
Progress Energy | Financial Asset, 1 to 29 Days Past Due
Financing Receivable, Past Due [Line Items]
Trade and other receivables	121	60
Progress Energy | Financial Asset, Equal to or Greater than 90 Days Past Due
Financing Receivable, Past Due [Line Items]
Trade and other receivables	71	74
Duke Energy Progress
Financing Receivable, Past Due [Line Items]
Unbilled Receivables	206	232
Current	658	637
Deferred Payment Arrangements	27	35
Trade and Other Receivables	1,004	1,004
Duke Energy Progress | 30-60 days
Financing Receivable, Past Due [Line Items]
Trade and other receivables	38	49
Duke Energy Progress | 60-90 days
Financing Receivable, Past Due [Line Items]
Trade and other receivables	7	9
Duke Energy Progress | Financial Asset, 1 to 29 Days Past Due
Financing Receivable, Past Due [Line Items]
Trade and other receivables	44	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	127	123
Current	573	417
Deferred Payment Arrangements	23	27
Trade and Other Receivables	880	680
Duke Energy Florida | 30-60 days
Financing Receivable, Past Due [Line Items]
Trade and other receivables	19	12
Duke Energy Florida | 60-90 days
Financing Receivable, Past Due [Line Items]
Trade and other receivables	14	9
Duke Energy Florida | Financial Asset, 1 to 29 Days Past Due
Financing Receivable, Past Due [Line Items]
Trade and other receivables	77	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	47	47
Duke Energy Ohio
Financing Receivable, Past Due [Line Items]
Unbilled Receivables	2	20
Current	55	15
Deferred Payment Arrangements	3	4
Trade and Other Receivables	105	79
Duke Energy Ohio | CRC
Financing Receivable, Past Due [Line Items]
Unbilled Receivables	95	148
Duke Energy Ohio | 30-60 days
Financing Receivable, Past Due [Line Items]
Trade and other receivables	2	6
Duke Energy Ohio | 60-90 days
Financing Receivable, Past Due [Line Items]
Trade and other receivables	1	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	37	26
Duke Energy Indiana
Financing Receivable, Past Due [Line Items]
Unbilled Receivables	27	28
Current	54	52
Trade and Other Receivables	122	116
Duke Energy Indiana | CRC
Financing Receivable, Past Due [Line Items]
Unbilled Receivables	156	260
Duke Energy Indiana | 30-60 days
Financing Receivable, Past Due [Line Items]
Trade and other receivables	5	2
Duke Energy Indiana | 60-90 days
Financing Receivable, Past Due [Line Items]
Trade and other receivables	2	11
Duke Energy Indiana | Financial Asset, 1 to 29 Days Past Due
Financing Receivable, Past Due [Line Items]
Trade and other receivables	10	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	24	6
Piedmont
Financing Receivable, Past Due [Line Items]
Unbilled Receivables	8	160
Current	83	265
Deferred Payment Arrangements		1
Trade and Other Receivables	109	450
Piedmont | 30-60 days
Financing Receivable, Past Due [Line Items]
Trade and other receivables	5	3
Piedmont | 60-90 days
Financing Receivable, Past Due [Line Items]
Trade and other receivables	3	2
Piedmont | Financial Asset, 1 to 29 Days Past Due
Financing Receivable, Past Due [Line Items]
Trade and other receivables	5	15
Piedmont | Financial Asset, Equal to or Greater than 90 Days Past Due
Financing Receivable, Past Due [Line Items]
Trade and other receivables	$ 5	$ 4