Revenue (Reserve for Credit Losses for Trade and Other Receivables) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	$ 136	$ 123	$ 122	$ 146
Cumulative Change in Accounting Principle	174	123	174	123
Write-Offs	(49)	(13)	(103)	(39)
Credit Loss Expense	36	11	80	40
Other Adjustments	51	2	75	(24)
Ending balance	174	123	174	123
Duke Energy Carolinas
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	52	42	42	23
Cumulative Change in Accounting Principle	62	42	62	42
Write-Offs	(19)	(3)	(44)	(10)
Credit Loss Expense	10	4	23	20
Other Adjustments	19	(1)	41	9
Ending balance	62	42	62	42
Progress Energy
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	52	36	36	37
Cumulative Change in Accounting Principle	67	36	67	36
Write-Offs	(26)	(6)	(45)	(20)
Credit Loss Expense	20	6	39	19
Other Adjustments	21		37
Ending balance	67	36	67	36
Duke Energy Progress
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	31	21	21	23
Cumulative Change in Accounting Principle	41	21	41	21
Write-Offs	(11)	(3)	(18)	(11)
Credit Loss Expense	5	3	11	9
Other Adjustments	16		27
Ending balance	41	21	41	21
Duke Energy Florida
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	21	16	16	14
Cumulative Change in Accounting Principle	26	16	26	16
Write-Offs	(15)	(3)	(28)	(9)
Credit Loss Expense	15	3	28	10
Other Adjustments	5		10	1
Ending balance	26	16	26	16
Duke Energy Ohio
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	4	4	4	4
Cumulative Change in Accounting Principle	6	4	6	4
Credit Loss Expense	2		2
Ending balance	6	4	6	4
Duke Energy Indiana
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	3	3	3	3
Cumulative Change in Accounting Principle	4	3	4	3
Credit Loss Expense	1		1
Ending balance	4	3	4	3
Piedmont
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	15	13	15	12
Cumulative Change in Accounting Principle	14	15	14	15
Write-Offs	(4)	(4)	(10)	(7)
Credit Loss Expense	3	2	9	6
Other Adjustments		4		4
Ending balance	$ 14	$ 15	$ 14	$ 15