Goodwill and Intangible Assets (Schedule of Intangible Assets) (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Finite-Lived Intangible Assets, Net [Abstract]
Total gross carrying amounts	$ 296	$ 273
Total intangible assets, net	282	265
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	232	210
Other
Finite-Lived Intangible Assets, Net [Abstract]
Total gross carrying amounts	56	55
Accumulated amortization	(14)	(8)
Duke Energy Carolinas
Finite-Lived Intangible Assets, Net [Abstract]
Total gross carrying amounts	97	84
Total intangible assets, net	97	84
Duke Energy Carolinas | Renewable energy certificates
Finite-Lived Intangible Assets, Net [Abstract]
Total gross carrying amounts	97	84
Progress Energy
Finite-Lived Intangible Assets, Net [Abstract]
Total gross carrying amounts	143	133
Total intangible assets, net	140	132
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	133	124
Progress Energy | Other
Finite-Lived Intangible Assets, Net [Abstract]
Total gross carrying amounts	5	4
Accumulated amortization	(3)	(1)
Duke Energy Progress
Finite-Lived Intangible Assets, Net [Abstract]
Total gross carrying amounts	136	127
Total intangible assets, net	136	127
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	133	124
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	6	6
Total intangible assets, net	3	5
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	3	3
Accumulated amortization	(3)	(1)
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	16	20
Piedmont | Other
Finite-Lived Intangible Assets, Net [Abstract]
Total gross carrying amounts	22	22
Accumulated amortization	$ (6)	$ (2)