Asset Retirement Obligations (NDTF Information) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
NDTF Information [Abstract]
Annual funding requirement	$ 4
Decommissioning costs	8,814
Legally restricted NDTF investments, fair value	8,851	$ 7,466
Duke Energy Carolinas
NDTF Information [Abstract]
Decommissioning costs	4,439
Legally restricted NDTF investments, fair value	5,002	4,208
Duke Energy Progress
NDTF Information [Abstract]
Annual funding requirement	4
Decommissioning costs	4,181
Legally restricted NDTF investments, fair value	3,849	$ 3,258
Duke Energy Florida
NDTF Information [Abstract]
Decommissioning costs	$ 194