Revenue (Reserve for Credit Losses for Trade and Other Receivables) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	$ 194	$ 207
Write-Offs	(27)	(29)
Credit Loss Expense	35	14
Other Adjustments	(1)	9
Ending balance	201	201
Duke Energy Carolinas
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	55	69
Write-Offs	(7)	(14)
Credit Loss Expense	10	5
Other Adjustments	(1)	4
Ending balance	57	64
Progress Energy
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	65	73
Write-Offs	(10)	(15)
Credit Loss Expense	10	8
Other Adjustments	0	1
Ending balance	65	67
Duke Energy Progress
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	38	44
Write-Offs	(6)	(8)
Credit Loss Expense	7	5
Other Adjustments	0	1
Ending balance	39	42
Duke Energy Florida
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	27	29
Write-Offs	(4)	(7)
Credit Loss Expense	3	3
Other Adjustments	0	0
Ending balance	26	25
Duke Energy Ohio
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	51	43
Write-Offs	(7)	0
Credit Loss Expense	8	1
Other Adjustments	0	2
Ending balance	52	46
Duke Energy Indiana
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	15	15
Write-Offs	(2)	0
Credit Loss Expense	3	0
Other Adjustments	0	2
Ending balance	16	17
Piedmont
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	6	7
Write-Offs	(1)	0
Credit Loss Expense	4	0
Other Adjustments	0	0
Ending balance	$ 9	$ 7