Revenue (Reserve for Credit Losses for Trade and Other Receivables) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	$ 204	$ 204	$ 209	$ 205
Write-Offs	(46)	(36)	(75)	(68)
Credit Loss Expense	32	35	46	45
Other Adjustments	9	4	19	25
Ending balance	199	207	199	207
Duke Energy Carolinas
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	64	62	69	56
Write-Offs	(12)	(16)	(26)	(28)
Credit Loss Expense	5	10	10	17
Other Adjustments	0	9	4	20
Ending balance	57	65	57	65
Progress Energy
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	67	73	73	74
Write-Offs	(14)	(17)	(29)	(33)
Credit Loss Expense	10	11	18	20
Other Adjustments	7	6	8	12
Ending balance	70	73	70	73
Duke Energy Progress
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	42	47	44	44
Write-Offs	(10)	(12)	(18)	(19)
Credit Loss Expense	3	6	8	10
Other Adjustments	7	6	8	12
Ending balance	42	47	42	47
Duke Energy Florida
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	25	27	29	31
Write-Offs	(4)	(5)	(11)	(14)
Credit Loss Expense	7	5	10	10
Other Adjustments	0	(1)	0	(1)
Ending balance	28	26	28	26
Duke Energy Ohio
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	46	41	43	9
Write-Offs	(8)	0	(8)	0
Credit Loss Expense	0	1	1	2
Other Adjustments	3	0	5	31
Ending balance	41	42	41	42
Duke Energy Indiana
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	17	16	15	5
Write-Offs	(4)	0	(4)	0
Credit Loss Expense	6	0	6	2
Other Adjustments	(2)	0	0	9
Ending balance	17	16	17	16
Piedmont
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	10	12	10	11
Write-Offs	(8)	(3)	(8)	(4)
Credit Loss Expense	11	2	11	4
Other Adjustments	1	0	1	0
Ending balance	$ 14	$ 11	$ 14	$ 11