Revenue (Reserve for Credit Losses for Trade and Other Receivables) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	$ 216	$ 121	$ 146
Cumulative Change in Accounting Principle	205	216	121
Write-Offs	(164)	(158)	(58)
Credit Loss Expense	101	160	53
Other Adjustments	52	93	(20)
Ending balance	205	216	121
Duke Energy Carolinas
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	68	42	23
Cumulative Change in Accounting Principle	56	68	42
Write-Offs	(71)	(73)	(21)
Credit Loss Expense	35	40	27
Other Adjustments	24	59	13
Ending balance	56	68	42
Progress Energy
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	81	36	37
Cumulative Change in Accounting Principle	74	81	36
Write-Offs	(84)	(70)	(25)
Credit Loss Expense	48	72	25
Other Adjustments	29	43	(1)
Ending balance	74	81	36
Duke Energy Progress
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	44	21	23
Cumulative Change in Accounting Principle	44	44	21
Write-Offs	(41)	(36)	(12)
Credit Loss Expense	12	17	11
Other Adjustments	29	42	(1)
Ending balance	44	44	21
Duke Energy Florida
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	36	16	14
Cumulative Change in Accounting Principle	31	36	16
Write-Offs	(42)	(34)	(13)
Credit Loss Expense	37	55	14
Other Adjustments		(1)	1
Ending balance	31	36	16
Duke Energy Ohio
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	6	4	4
Cumulative Change in Accounting Principle	9	6	4
Credit Loss Expense	3	2
Ending balance	9	6	4
Duke Energy Indiana
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	4	3	3
Cumulative Change in Accounting Principle	5	4	3
Credit Loss Expense	1	1
Ending balance	5	4	3
Piedmont
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	14	15	12
Cumulative Change in Accounting Principle	11	14	15
Write-Offs	(10)	(12)	(9)
Credit Loss Expense	7	11	7
Other Adjustments			5
Ending balance	$ 11	$ 14	$ 15