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