Summary of Significant Accounting Policies (Excise Taxes) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Organization And Basis Of Presentation [Line Items]
Excise taxes	$ 458	$ 449	$ 420
Duke Energy Carolinas
Organization And Basis Of Presentation [Line Items]
Excise taxes	27	47	44
Progress Energy
Organization And Basis Of Presentation [Line Items]
Excise taxes	322	290	250
Duke Energy Progress
Organization And Basis Of Presentation [Line Items]
Excise taxes	5	25	22
Duke Energy Florida
Organization And Basis Of Presentation [Line Items]
Excise taxes	317	265	228
Duke Energy Ohio
Organization And Basis Of Presentation [Line Items]
Excise taxes	106	104	102
Duke Energy Indiana
Organization And Basis Of Presentation [Line Items]
Excise taxes	1	7	23
Piedmont
Organization And Basis Of Presentation [Line Items]
Excise taxes	$ 2	$ 1	$ 1