Revenue (Reserve for Credit Losses for Trade and Other Receivables) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	$ 205	$ 216
Cumulative Change in Accounting Principle	204	214
Write-Offs	(32)	(42)
Credit Loss Expense	10	16
Other Adjustments	21	24
Ending balance	204	214
Duke Energy Carolinas
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	56	68
Cumulative Change in Accounting Principle	62	70
Write-Offs	(12)	(20)
Credit Loss Expense	7	7
Other Adjustments	11	15
Ending balance	62	70
Progress Energy
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	74	81
Cumulative Change in Accounting Principle	73	75
Write-Offs	(16)	(22)
Credit Loss Expense	9	6
Other Adjustments	6	10
Ending balance	73	75
Duke Energy Progress
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	44	44
Cumulative Change in Accounting Principle	47	45
Write-Offs	(7)	(9)
Credit Loss Expense	4	1
Other Adjustments	6	9
Ending balance	47	45
Duke Energy Florida
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	31	36
Cumulative Change in Accounting Principle	27	30
Write-Offs	(9)	(12)
Credit Loss Expense	5	5
Other Adjustments	0	1
Ending balance	27	30
Duke Energy Ohio
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	9	6
Cumulative Change in Accounting Principle	41	7
Write-Offs	0	0
Credit Loss Expense	1	1
Other Adjustments	31	0
Ending balance	41	7
Duke Energy Indiana
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	5	4
Cumulative Change in Accounting Principle	16	4
Write-Offs	0	0
Credit Loss Expense	2	0
Other Adjustments	9	0
Ending balance	16	4
Piedmont
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	11	14
Cumulative Change in Accounting Principle	12	14
Write-Offs	(1)	(1)
Credit Loss Expense	2	1
Other Adjustments	0	0
Ending balance	$ 12	$ 14