Revenue (Aging of Trade Receivables) (Details) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Financing Receivable, Past Due [Line Items]
Unbilled Receivables	$ 1,175	$ 964
Trade and Other Receivables, not past due	2,202	2,104
Deferred Payment Arrangements	148	115
Trade and Other Receivables	4,064	3,732
30-60 days
Financing Receivable, Past Due [Line Items]
Trade and Other Receivables	177	212
60-90 days
Financing Receivable, Past Due [Line Items]
Trade and Other Receivables	88	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	412	316
Trade and Other Receivables, not past due	592	595
Deferred Payment Arrangements	62	55
Trade and Other Receivables	1,214	1,186
Duke Energy Carolinas | 30-60 days
Financing Receivable, Past Due [Line Items]
Trade and Other Receivables	52	77
Duke Energy Carolinas | 60-90 days
Financing Receivable, Past Due [Line Items]
Trade and Other Receivables	16	37
Duke Energy Carolinas | 90 days
Financing Receivable, Past Due [Line Items]
Trade and Other Receivables	80	106
Progress Energy
Financing Receivable, Past Due [Line Items]
Unbilled Receivables	359	266
Trade and Other Receivables, not past due	946	800
Deferred Payment Arrangements	61	45
Trade and Other Receivables	1,596	1,289
Progress Energy | 30-60 days
Financing Receivable, Past Due [Line Items]
Trade and Other Receivables	90	72
Progress Energy | 60-90 days
Financing Receivable, Past Due [Line Items]
Trade and Other Receivables	44	41
Progress Energy | 90 days
Financing Receivable, Past Due [Line Items]
Trade and Other Receivables	96	65
Duke Energy Progress
Financing Receivable, Past Due [Line Items]
Unbilled Receivables	205	193
Trade and Other Receivables, not past due	451	405
Deferred Payment Arrangements	36	22
Trade and Other Receivables	799	722
Duke Energy Progress | 30-60 days
Financing Receivable, Past Due [Line Items]
Trade and Other Receivables	41	44
Duke Energy Progress | 60-90 days
Financing Receivable, Past Due [Line Items]
Trade and Other Receivables	20	21
Duke Energy Progress | 90 days
Financing Receivable, Past Due [Line Items]
Trade and Other Receivables	46	37
Duke Energy Florida
Financing Receivable, Past Due [Line Items]
Unbilled Receivables	154	73
Trade and Other Receivables, not past due	492	393
Deferred Payment Arrangements	25	23
Trade and Other Receivables	794	565
Duke Energy Florida | 30-60 days
Financing Receivable, Past Due [Line Items]
Trade and Other Receivables	49	28
Duke Energy Florida | 60-90 days
Financing Receivable, Past Due [Line Items]
Trade and Other Receivables	24	20
Duke Energy Florida | 90 days
Financing Receivable, Past Due [Line Items]
Trade and Other Receivables	50	28
Duke Energy Ohio
Financing Receivable, Past Due [Line Items]
Unbilled Receivables	8	4
Trade and Other Receivables, not past due	32	42
Deferred Payment Arrangements	1	2
Trade and Other Receivables	87	100
Duke Energy Ohio | CRC
Financing Receivable, Past Due [Line Items]
Unbilled Receivables	102	82
Duke Energy Ohio | 30-60 days
Financing Receivable, Past Due [Line Items]
Trade and Other Receivables	2	4
Duke Energy Ohio | 60-90 days
Financing Receivable, Past Due [Line Items]
Trade and Other Receivables	1	1
Duke Energy Ohio | 90 days
Financing Receivable, Past Due [Line Items]
Trade and Other Receivables	43	47
Duke Energy Indiana
Financing Receivable, Past Due [Line Items]
Unbilled Receivables	24	27
Trade and Other Receivables, not past due	41	51
Trade and Other Receivables	88	103
Duke Energy Indiana | CRC
Financing Receivable, Past Due [Line Items]
Unbilled Receivables	199	121
Duke Energy Indiana | 30-60 days
Financing Receivable, Past Due [Line Items]
Trade and Other Receivables	3	13
Duke Energy Indiana | 60-90 days
Financing Receivable, Past Due [Line Items]
Trade and Other Receivables	6	1
Duke Energy Indiana | 90 days
Financing Receivable, Past Due [Line Items]
Trade and Other Receivables	14	11
Piedmont
Financing Receivable, Past Due [Line Items]
Unbilled Receivables	10	106
Trade and Other Receivables, not past due	127	202
Deferred Payment Arrangements	4	4
Trade and Other Receivables	165	333
Piedmont | 30-60 days
Financing Receivable, Past Due [Line Items]
Trade and Other Receivables	8	12
Piedmont | 60-90 days
Financing Receivable, Past Due [Line Items]
Trade and Other Receivables	5	2
Piedmont | 90 days
Financing Receivable, Past Due [Line Items]
Trade and Other Receivables	$ 11	$ 7