Goodwill and Intangible Assets (Schedule of Intangible Assets) (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Finite-Lived Intangible Assets, Net [Abstract]
Gross carrying amount	$ 370	$ 355
Accumulated amortization	(66)	(60)
Total intangible assets, net	304	295
Emission allowances
Finite-Lived Intangible Assets, Net [Abstract]
Gross carrying amount	8	8
Renewable energy certificates
Finite-Lived Intangible Assets, Net [Abstract]
Gross carrying amount	204	196
Natural gas, coal and power contracts
Finite-Lived Intangible Assets, Net [Abstract]
Gross carrying amount	24	24
Accumulated amortization	(24)	(23)
Renewable operating and development projects
Finite-Lived Intangible Assets, Net [Abstract]
Gross carrying amount	106	107
Accumulated amortization	(38)	(34)
Other
Finite-Lived Intangible Assets, Net [Abstract]
Gross carrying amount	28	20
Accumulated amortization	(4)	(3)
Duke Energy Carolinas
Finite-Lived Intangible Assets, Net [Abstract]
Gross carrying amount	73	65
Total intangible assets, net	73	65
Duke Energy Carolinas | Renewable energy certificates
Finite-Lived Intangible Assets, Net [Abstract]
Gross carrying amount	73	65
Progress Energy
Finite-Lived Intangible Assets, Net [Abstract]
Gross carrying amount	136	135
Total intangible assets, net	136	135
Progress Energy | Emission allowances
Finite-Lived Intangible Assets, Net [Abstract]
Gross carrying amount	5	5
Progress Energy | Renewable energy certificates
Finite-Lived Intangible Assets, Net [Abstract]
Gross carrying amount	131	130
Duke Energy Progress
Finite-Lived Intangible Assets, Net [Abstract]
Gross carrying amount	133	132
Total intangible assets, net	133	132
Duke Energy Progress | Emission allowances
Finite-Lived Intangible Assets, Net [Abstract]
Gross carrying amount	2	2
Duke Energy Progress | Renewable energy certificates
Finite-Lived Intangible Assets, Net [Abstract]
Gross carrying amount	131	130
Duke Energy Florida
Finite-Lived Intangible Assets, Net [Abstract]
Gross carrying amount	3	3
Total intangible assets, net	3	3
Duke Energy Florida | Emission allowances
Finite-Lived Intangible Assets, Net [Abstract]
Gross carrying amount	3	3
Duke Energy Ohio
Finite-Lived Intangible Assets, Net [Abstract]
Gross carrying amount		1
Total intangible assets, net		1
Duke Energy Ohio | Renewable energy certificates
Finite-Lived Intangible Assets, Net [Abstract]
Gross carrying amount		1
Duke Energy Indiana
Finite-Lived Intangible Assets, Net [Abstract]
Gross carrying amount	26	26
Accumulated amortization	(24)	(23)
Total intangible assets, net	2	3
Duke Energy Indiana | Emission allowances
Finite-Lived Intangible Assets, Net [Abstract]
Gross carrying amount	2	2
Duke Energy Indiana | Natural gas, coal and power contracts
Finite-Lived Intangible Assets, Net [Abstract]
Gross carrying amount	24	24
Accumulated amortization	$ (24)	$ (23)