Goodwill and Intangible Assets (Schedule of Intangible Assets) (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Finite-Lived Intangible Assets, Net [Abstract]
Total gross carrying amounts	$ 296	$ 296
Total intangible assets, net	277	282
Emission allowances
Finite-Lived Intangible Assets, Net [Abstract]
Total gross carrying amounts	8	8
Renewable energy certificates
Finite-Lived Intangible Assets, Net [Abstract]
Total gross carrying amounts	241	232
Other
Finite-Lived Intangible Assets, Net [Abstract]
Total gross carrying amounts	47	56
Accumulated amortization	(19)	(14)
Duke Energy Carolinas
Finite-Lived Intangible Assets, Net [Abstract]
Total gross carrying amounts	103	97
Total intangible assets, net	103	97
Duke Energy Carolinas | Renewable energy certificates
Finite-Lived Intangible Assets, Net [Abstract]
Total gross carrying amounts	103	97
Progress Energy
Finite-Lived Intangible Assets, Net [Abstract]
Total gross carrying amounts	146	143
Total intangible assets, net	143	140
Progress Energy | Emission allowances
Finite-Lived Intangible Assets, Net [Abstract]
Total gross carrying amounts	5	5
Progress Energy | Renewable energy certificates
Finite-Lived Intangible Assets, Net [Abstract]
Total gross carrying amounts	136	133
Progress Energy | Other
Finite-Lived Intangible Assets, Net [Abstract]
Total gross carrying amounts	5	5
Accumulated amortization	(3)	(3)
Duke Energy Progress
Finite-Lived Intangible Assets, Net [Abstract]
Total gross carrying amounts	139	136
Total intangible assets, net	139	136
Duke Energy Progress | Emission allowances
Finite-Lived Intangible Assets, Net [Abstract]
Total gross carrying amounts	2	2
Duke Energy Progress | Renewable energy certificates
Finite-Lived Intangible Assets, Net [Abstract]
Total gross carrying amounts	136	133
Duke Energy Progress | Other
Finite-Lived Intangible Assets, Net [Abstract]
Total gross carrying amounts	1	1
Duke Energy Florida
Finite-Lived Intangible Assets, Net [Abstract]
Total gross carrying amounts	7	6
Total intangible assets, net	4	3
Duke Energy Florida | Emission allowances
Finite-Lived Intangible Assets, Net [Abstract]
Total gross carrying amounts	3	3
Duke Energy Florida | Other
Finite-Lived Intangible Assets, Net [Abstract]
Total gross carrying amounts	4	3
Accumulated amortization	(3)	(3)
Duke Energy Ohio
Finite-Lived Intangible Assets, Net [Abstract]
Total gross carrying amounts	2	2
Total intangible assets, net	2	2
Duke Energy Ohio | Renewable energy certificates
Finite-Lived Intangible Assets, Net [Abstract]
Total gross carrying amounts	2	2
Duke Energy Indiana
Finite-Lived Intangible Assets, Net [Abstract]
Total gross carrying amounts	2	2
Total intangible assets, net	2	2
Duke Energy Indiana | Emission allowances
Finite-Lived Intangible Assets, Net [Abstract]
Total gross carrying amounts	2	2
Piedmont
Finite-Lived Intangible Assets, Net [Abstract]
Total gross carrying amounts	22	22
Total intangible assets, net	13	16
Piedmont | Other
Finite-Lived Intangible Assets, Net [Abstract]
Total gross carrying amounts	22	22
Accumulated amortization	$ (9)	$ (6)