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Revenue (Reserve for Credit Losses for Trade and Other Receivables) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	$ 195	$ 204	$ 207	$ 202
Write-Offs	(34)	(29)	(115)	(97)
Credit Loss Expense	25	34	73	79
Other Adjustments	13	5	34	30
Ending balance	199	214	199	214
Duke Energy Carolinas
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	57	65	69	56
Write-Offs	(13)	(13)	(39)	(41)
Credit Loss Expense	8	15	18	32
Other Adjustments	4	3	8	23
Ending balance	56	70	56	70
Progress Energy
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	70	73	73	74
Write-Offs	(15)	(16)	(44)	(49)
Credit Loss Expense	10	18	28	38
Other Adjustments	2	4	10	16
Ending balance	67	79	67	79
Duke Energy Progress
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	42	47	44	44
Write-Offs	(10)	(10)	(28)	(29)
Credit Loss Expense	5	7	13	17
Other Adjustments	2	4	10	16
Ending balance	39	48	39	48
Duke Energy Florida
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	28	26	29	31
Write-Offs	(5)	(6)	(16)	(20)
Credit Loss Expense	5	11	15	21
Other Adjustments	0	0	0	(1)
Ending balance	28	31	28	31
Duke Energy Ohio
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	41	42	43	9
Write-Offs	(2)	0	(10)	0
Credit Loss Expense	3	0	4	2
Other Adjustments	9	(1)	14	30
Ending balance	51	41	51	41
Duke Energy Indiana
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	17	16	15	5
Write-Offs	(4)	0	(8)	0
Credit Loss Expense	4	0	10	2
Other Adjustments	0	0	0	9
Ending balance	17	16	17	16
Piedmont
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	8	8	7	8
Write-Offs	0	0	(14)	(4)
Credit Loss Expense	0	1	13	5
Other Adjustments	0	0	2	0
Ending balance	$ 8	$ 9	$ 8	$ 9