Revenue (Reserve for Credit Losses for Trade and Other Receivables) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	$ 146	$ 76
Cumulative Change in Accounting Principle	122	146
Write-Offs	(58)	(58)
Credit Loss Expense	54	75
Other Adjustments	(20)	48
Ending balance	122	146
Duke Energy Carolinas
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	23	10
Cumulative Change in Accounting Principle	42	23
Write-Offs	(21)	(13)
Credit Loss Expense	27	13
Other Adjustments	13	12
Ending balance	42	23
Progress Energy
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	37	16
Cumulative Change in Accounting Principle	36	37
Write-Offs	(25)	(23)
Credit Loss Expense	25	29
Other Adjustments	(1)	13
Ending balance	36	37
Duke Energy Progress
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	23	8
Cumulative Change in Accounting Principle	21	23
Write-Offs	(12)	(8)
Credit Loss Expense	11	9
Other Adjustments	(1)	13
Ending balance	21	23
Duke Energy Florida
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	14	7
Cumulative Change in Accounting Principle	16	14
Write-Offs	(13)	(14)
Credit Loss Expense	14	20
Other Adjustments	1
Ending balance	16	14
Duke Energy Ohio
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	4	4
Cumulative Change in Accounting Principle	4	4
Ending balance	4	4
Duke Energy Indiana
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	3	3
Cumulative Change in Accounting Principle	3	3
Ending balance	3	3
Piedmont
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	12	6
Cumulative Change in Accounting Principle	15	12
Write-Offs	(9)	(6)
Credit Loss Expense	7	11
Other Adjustments	5
Ending balance	$ 15	12
Cumulative Change in Accounting Principle
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance		5
Cumulative Change in Accounting Principle
Cumulative Change in Accounting Principle | Duke Energy Carolinas
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance		1
Cumulative Change in Accounting Principle
Cumulative Change in Accounting Principle | Progress Energy
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance		2
Cumulative Change in Accounting Principle
Cumulative Change in Accounting Principle | Duke Energy Progress
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance		1
Cumulative Change in Accounting Principle
Cumulative Change in Accounting Principle | Duke Energy Florida
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance		1
Cumulative Change in Accounting Principle
Cumulative Change in Accounting Principle | Piedmont
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance		$ 1
Cumulative Change in Accounting Principle