Summary of Significant Accounting Policies (Excise Taxes) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Organization And Basis Of Presentation [Line Items]
Excise taxes	$ 423	$ 458	$ 449
Duke Energy Carolinas
Organization And Basis Of Presentation [Line Items]
Excise taxes	31	27	47
Progress Energy
Organization And Basis Of Presentation [Line Items]
Excise taxes	285	322	290
Duke Energy Progress
Organization And Basis Of Presentation [Line Items]
Excise taxes	9	5	25
Duke Energy Florida
Organization And Basis Of Presentation [Line Items]
Excise taxes	276	317	265
Duke Energy Ohio
Organization And Basis Of Presentation [Line Items]
Excise taxes	105	106	104
Duke Energy Indiana
Organization And Basis Of Presentation [Line Items]
Excise taxes	0	1	7
Piedmont
Organization And Basis Of Presentation [Line Items]
Excise taxes	$ 2	$ 2	$ 1