Revenue (Aging of Trade Receivables) (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Financing Receivable, Past Due [Line Items]
Unbilled Receivables	$ 945	$ 964
Trade and Other Receivables, not past due	2,133	2,104
Deferred Payment Arrangements	136	115
Trade and Other Receivables	3,878	3,732
30-60 days
Financing Receivable, Past Due [Line Items]
Trade and Other Receivables	288	212
60-90 days
Financing Receivable, Past Due [Line Items]
Trade and Other Receivables	102	88
90 days
Financing Receivable, Past Due [Line Items]
Trade and Other Receivables	274	249
Duke Energy Carolinas
Financing Receivable, Past Due [Line Items]
Unbilled Receivables	339	316
Trade and Other Receivables, not past due	518	595
Deferred Payment Arrangements	60	55
Trade and Other Receivables	1,144	1,186
Duke Energy Carolinas | 30-60 days
Financing Receivable, Past Due [Line Items]
Trade and Other Receivables	75	77
Duke Energy Carolinas | 60-90 days
Financing Receivable, Past Due [Line Items]
Trade and Other Receivables	33	37
Duke Energy Carolinas | 90 days
Financing Receivable, Past Due [Line Items]
Trade and Other Receivables	119	106
Progress Energy
Financing Receivable, Past Due [Line Items]
Unbilled Receivables	270	266
Trade and Other Receivables, not past due	944	800
Deferred Payment Arrangements	61	45
Trade and Other Receivables	1,503	1,289
Progress Energy | 30-60 days
Financing Receivable, Past Due [Line Items]
Trade and Other Receivables	111	72
Progress Energy | 60-90 days
Financing Receivable, Past Due [Line Items]
Trade and Other Receivables	40	41
Progress Energy | 90 days
Financing Receivable, Past Due [Line Items]
Trade and Other Receivables	77	65
Duke Energy Progress
Financing Receivable, Past Due [Line Items]
Unbilled Receivables	161	193
Trade and Other Receivables, not past due	558	405
Deferred Payment Arrangements	33	22
Trade and Other Receivables	877	722
Duke Energy Progress | 30-60 days
Financing Receivable, Past Due [Line Items]
Trade and Other Receivables	64	44
Duke Energy Progress | 60-90 days
Financing Receivable, Past Due [Line Items]
Trade and Other Receivables	22	21
Duke Energy Progress | 90 days
Financing Receivable, Past Due [Line Items]
Trade and Other Receivables	39	37
Duke Energy Florida
Financing Receivable, Past Due [Line Items]
Unbilled Receivables	109	73
Trade and Other Receivables, not past due	386	393
Deferred Payment Arrangements	28	23
Trade and Other Receivables	626	565
Duke Energy Florida | 30-60 days
Financing Receivable, Past Due [Line Items]
Trade and Other Receivables	47	28
Duke Energy Florida | 60-90 days
Financing Receivable, Past Due [Line Items]
Trade and Other Receivables	18	20
Duke Energy Florida | 90 days
Financing Receivable, Past Due [Line Items]
Trade and Other Receivables	38	28
Duke Energy Ohio
Financing Receivable, Past Due [Line Items]
Unbilled Receivables	7	4
Trade and Other Receivables, not past due	40	42
Deferred Payment Arrangements	2	2
Trade and Other Receivables	105	100
Duke Energy Ohio | CRC
Financing Receivable, Past Due [Line Items]
Unbilled Receivables	63	82
Duke Energy Ohio | 30-60 days
Financing Receivable, Past Due [Line Items]
Trade and Other Receivables	8	4
Duke Energy Ohio | 60-90 days
Financing Receivable, Past Due [Line Items]
Trade and Other Receivables	2	1
Duke Energy Ohio | 90 days
Financing Receivable, Past Due [Line Items]
Trade and Other Receivables	46	47
Duke Energy Indiana
Financing Receivable, Past Due [Line Items]
Unbilled Receivables	44	27
Trade and Other Receivables, not past due	26	51
Trade and Other Receivables	86	103
Duke Energy Indiana | CRC
Financing Receivable, Past Due [Line Items]
Unbilled Receivables	100	121
Duke Energy Indiana | 30-60 days
Financing Receivable, Past Due [Line Items]
Trade and Other Receivables	4	13
Duke Energy Indiana | 60-90 days
Financing Receivable, Past Due [Line Items]
Trade and Other Receivables	3	1
Duke Energy Indiana | 90 days
Financing Receivable, Past Due [Line Items]
Trade and Other Receivables	9	11
Piedmont
Financing Receivable, Past Due [Line Items]
Unbilled Receivables	64	106
Trade and Other Receivables, not past due	215	202
Deferred Payment Arrangements	4	4
Trade and Other Receivables	320	333
Piedmont | 30-60 days
Financing Receivable, Past Due [Line Items]
Trade and Other Receivables	23	12
Piedmont | 60-90 days
Financing Receivable, Past Due [Line Items]
Trade and Other Receivables	7	2
Piedmont | 90 days
Financing Receivable, Past Due [Line Items]
Trade and Other Receivables	$ 7	$ 7