Revenue (Reserve for Credit Losses for Trade and Other Receivables) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	$ 214	$ 139	$ 216	$ 121
Cumulative Change in Accounting Principle	199	135	199	135
Write-Offs	(43)	(31)	(85)	(54)
Credit Loss Expense	23	20	39	44
Other Adjustments	5	7	29	24
Ending balance	199	135	199	135
Duke Energy Carolinas
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	70	52	68	42
Cumulative Change in Accounting Principle	57	52	57	52
Write-Offs	(20)	(16)	(40)	(25)
Credit Loss Expense	6	8	13	13
Other Adjustments	1	8	16	22
Ending balance	57	52	57	52
Progress Energy
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	75	51	81	36
Cumulative Change in Accounting Principle	73	52	73	52
Write-Offs	(18)	(9)	(40)	(19)
Credit Loss Expense	12	7	18	19
Other Adjustments	4	3	14	16
Ending balance	73	52	73	52
Duke Energy Progress
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	45	31	44	21
Cumulative Change in Accounting Principle	43	31	43	31
Write-Offs	(10)	(5)	(19)	(7)
Credit Loss Expense	4	2	5	6
Other Adjustments	4	3	13	11
Ending balance	43	31	43	31
Duke Energy Florida
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	30	21	36	16
Cumulative Change in Accounting Principle	30	21	30	21
Write-Offs	(8)	(5)	(20)	(13)
Credit Loss Expense	8	5	13	13
Other Adjustments			1	5
Ending balance	30	21	30	21
Duke Energy Ohio
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	7	4	6	4
Cumulative Change in Accounting Principle	8	4	8	4
Credit Loss Expense	1		2
Ending balance	8	4	8	4
Duke Energy Indiana
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	4	3	4	3
Cumulative Change in Accounting Principle	4	3	4	3
Ending balance	4	3	4	3
Piedmont
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	14	17	14	15
Cumulative Change in Accounting Principle	13	15	13	15
Write-Offs	(5)	(5)	(6)	(6)
Credit Loss Expense	4	3	5	6
Ending balance	$ 13	$ 15	$ 13	$ 15