Summary of Significant Accounting Policies (Excise Taxes) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Organization And Basis Of Presentation [Line Items]
Excise taxes	$ 449	$ 420	$ 415
Duke Energy Carolinas
Organization And Basis Of Presentation [Line Items]
Excise taxes	47	44	43
Progress Energy
Organization And Basis Of Presentation [Line Items]
Excise taxes	290	250	249
Duke Energy Progress
Organization And Basis Of Presentation [Line Items]
Excise taxes	25	22	26
Duke Energy Florida
Organization And Basis Of Presentation [Line Items]
Excise taxes	265	228	223
Duke Energy Ohio
Organization And Basis Of Presentation [Line Items]
Excise taxes	104	102	96
Duke Energy Indiana
Organization And Basis Of Presentation [Line Items]
Excise taxes	7	23	25
Piedmont
Organization And Basis Of Presentation [Line Items]
Excise taxes	$ 1	$ 1	$ 2