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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, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	$ 207	$ 199	$ 205	$ 216
Write-Offs	(29)	(36)	(97)	(121)
Credit Loss Expense	34	23	79	62
Other Adjustments	6	17	31	46
Ending balance	218	203	218	203
Duke Energy Carolinas
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	65	57	56	68
Write-Offs	(13)	(14)	(41)	(54)
Credit Loss Expense	15	5	32	18
Other Adjustments	3	8	23	24
Ending balance	70	56	70	56
Progress Energy
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	73	73	74	81
Write-Offs	(16)	(20)	(49)	(60)
Credit Loss Expense	18	15	38	33
Other Adjustments	4	9	16	23
Ending balance	79	77	79	77
Duke Energy Progress
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	47	43	44	44
Write-Offs	(10)	(11)	(29)	(30)
Credit Loss Expense	7	2	17	7
Other Adjustments	4	10	16	23
Ending balance	48	44	48	44
Duke Energy Florida
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	26	30	31	36
Write-Offs	(6)	(8)	(20)	(28)
Credit Loss Expense	11	13	21	26
Other Adjustments	0	(1)	(1)	0
Ending balance	31	34	31	34
Duke Energy Ohio
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	42	8	9	6
Write-Offs	0	0	0	0
Credit Loss Expense	0	0	2	2
Other Adjustments	(1)	0	30	0
Ending balance	41	8	41	8
Duke Energy Indiana
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	16	4	5	4
Write-Offs	0	0	0	0
Credit Loss Expense	0	1	2	1
Other Adjustments	0	0	9	0
Ending balance	16	5	16	5
Piedmont
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	11	13	11	14
Write-Offs	0	(5)	(4)	(11)
Credit Loss Expense	1	2	5	7
Other Adjustments	0	0	0	0
Ending balance	$ 12	$ 10	$ 12	$ 10