Revenue (Aging of Trade Receivables) (Details) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Financing Receivable, Past Due [Line Items]
Unbilled Receivables	$ 1,046	$ 964
Trade and Other Receivables, not past due	2,589	2,104
Deferred Payment Arrangements	179	115
Trade and Other Receivables	4,386	3,732
30-60 days
Financing Receivable, Past Due [Line Items]
Trade and Other Receivables	169	212
60-90 days
Financing Receivable, Past Due [Line Items]
Trade and Other Receivables	95	88
90 days
Financing Receivable, Past Due [Line Items]
Trade and Other Receivables	308	249
Duke Energy Carolinas
Financing Receivable, Past Due [Line Items]
Unbilled Receivables	342	316
Trade and Other Receivables, not past due	728	595
Deferred Payment Arrangements	58	55
Trade and Other Receivables	1,312	1,186
Duke Energy Carolinas | 30-60 days
Financing Receivable, Past Due [Line Items]
Trade and Other Receivables	60	77
Duke Energy Carolinas | 60-90 days
Financing Receivable, Past Due [Line Items]
Trade and Other Receivables	27	37
Duke Energy Carolinas | 90 days
Financing Receivable, Past Due [Line Items]
Trade and Other Receivables	97	106
Progress Energy
Financing Receivable, Past Due [Line Items]
Unbilled Receivables	328	266
Trade and Other Receivables, not past due	1,132	800
Deferred Payment Arrangements	79	45
Trade and Other Receivables	1,703	1,289
Progress Energy | 30-60 days
Financing Receivable, Past Due [Line Items]
Trade and Other Receivables	48	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	76	65
Duke Energy Progress
Financing Receivable, Past Due [Line Items]
Unbilled Receivables	233	193
Trade and Other Receivables, not past due	534	405
Deferred Payment Arrangements	40	22
Trade and Other Receivables	904	722
Duke Energy Progress | 30-60 days
Financing Receivable, Past Due [Line Items]
Trade and Other Receivables	34	44
Duke Energy Progress | 60-90 days
Financing Receivable, Past Due [Line Items]
Trade and Other Receivables	28	21
Duke Energy Progress | 90 days
Financing Receivable, Past Due [Line Items]
Trade and Other Receivables	35	37
Duke Energy Florida
Financing Receivable, Past Due [Line Items]
Unbilled Receivables	95	73
Trade and Other Receivables, not past due	595	393
Deferred Payment Arrangements	39	23
Trade and Other Receivables	796	565
Duke Energy Florida | 30-60 days
Financing Receivable, Past Due [Line Items]
Trade and Other Receivables	14	28
Duke Energy Florida | 60-90 days
Financing Receivable, Past Due [Line Items]
Trade and Other Receivables	12	20
Duke Energy Florida | 90 days
Financing Receivable, Past Due [Line Items]
Trade and Other Receivables	41	28
Duke Energy Ohio
Financing Receivable, Past Due [Line Items]
Unbilled Receivables	3	4
Trade and Other Receivables, not past due	34	42
Deferred Payment Arrangements	4	2
Trade and Other Receivables	94	100
Duke Energy Ohio | CRC
Financing Receivable, Past Due [Line Items]
Unbilled Receivables	100	82
Duke Energy Ohio | 30-60 days
Financing Receivable, Past Due [Line Items]
Trade and Other Receivables	6	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	45	47
Duke Energy Indiana
Financing Receivable, Past Due [Line Items]
Unbilled Receivables	32	27
Trade and Other Receivables, not past due	50	51
Trade and Other Receivables	110	103
Duke Energy Indiana | CRC
Financing Receivable, Past Due [Line Items]
Unbilled Receivables	168	121
Duke Energy Indiana | 30-60 days
Financing Receivable, Past Due [Line Items]
Trade and Other Receivables	6	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	19	11
Piedmont
Financing Receivable, Past Due [Line Items]
Unbilled Receivables	14	106
Trade and Other Receivables, not past due	100	202
Deferred Payment Arrangements		4
Trade and Other Receivables	130	333
Piedmont | 30-60 days
Financing Receivable, Past Due [Line Items]
Trade and Other Receivables	6	12
Piedmont | 60-90 days
Financing Receivable, Past Due [Line Items]
Trade and Other Receivables	3	2
Piedmont | 90 days
Financing Receivable, Past Due [Line Items]
Trade and Other Receivables	$ 7	$ 7