Revenue (Reserve for Credit Losses for Trade and Other Receivables) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	$ 199	$ 135	$ 216	$ 121
Cumulative Change in Accounting Principle	203	174	203	174
Write-Offs	(36)	(49)	(121)	(103)
Credit Loss Expense	23	37	62	81
Other Adjustments	17	51	46	75
Ending balance	203	174	203	174
Duke Energy Carolinas
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	57	52	68	42
Cumulative Change in Accounting Principle	56	62	56	62
Write-Offs	(14)	(19)	(54)	(44)
Credit Loss Expense	5	10	18	23
Other Adjustments	8	19	24	41
Ending balance	56	62	56	62
Progress Energy
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	73	52	81	36
Cumulative Change in Accounting Principle	77	67	77	67
Write-Offs	(20)	(26)	(60)	(45)
Credit Loss Expense	15	20	33	39
Other Adjustments	9	21	23	37
Ending balance	77	67	77	67
Duke Energy Progress
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	43	31	44	21
Cumulative Change in Accounting Principle	44	41	44	41
Write-Offs	(11)	(11)	(30)	(18)
Credit Loss Expense	2	5	7	11
Other Adjustments	10	16	23	27
Ending balance	44	41	44	41
Duke Energy Florida
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	30	21	36	16
Cumulative Change in Accounting Principle	34	26	34	26
Write-Offs	(8)	(15)	(28)	(28)
Credit Loss Expense	13	15	26	28
Other Adjustments	(1)	5		10
Ending balance	34	26	34	26
Duke Energy Ohio
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	8	4	6	4
Cumulative Change in Accounting Principle	8	6	8	6
Credit Loss Expense		2	2	2
Ending balance	8	6	8	6
Duke Energy Indiana
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	4	3	4	3
Cumulative Change in Accounting Principle	5	4	5	4
Credit Loss Expense	1	1	1	1
Ending balance	5	4	5	4
Piedmont
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	13	15	14	15
Cumulative Change in Accounting Principle	10	14	10	14
Write-Offs	(5)	(4)	(11)	(10)
Credit Loss Expense	2	3	7	9
Ending balance	$ 10	$ 14	$ 10	$ 14