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Goodwill and Intangible Assets (Narrative) (Details) - USD ($)	Aug. 31, 2020	Dec. 31, 2020	Dec. 31, 2019
Goodwill [Line Items]
Goodwill		$ 19,303,000,000	$ 19,303,000,000
Goodwill accumulated impairment loss		122,000,000	122,000,000
Impairment charges	$ 0
Electric Utilities and Infrastructure
Goodwill [Line Items]
Goodwill		17,379,000,000	17,379,000,000
Gas Utilities and Infrastructure
Goodwill [Line Items]
Goodwill		1,924,000,000	1,924,000,000
Duke Energy Ohio
Goodwill [Line Items]
Goodwill		920,000,000	920,000,000
Goodwill accumulated impairment loss		216,000,000	216,000,000
Duke Energy Ohio \| Electric Utilities and Infrastructure
Goodwill [Line Items]
Goodwill		596,000,000	596,000,000
Duke Energy Ohio \| Gas Utilities and Infrastructure
Goodwill [Line Items]
Goodwill		324,000,000	324,000,000
Progress Energy
Goodwill [Line Items]
Goodwill		3,655,000,000	3,655,000,000
Progress Energy \| Electric Utilities and Infrastructure
Goodwill [Line Items]
Goodwill accumulated impairment loss		0
Piedmont
Goodwill [Line Items]
Goodwill		49,000,000	$ 49,000,000
Piedmont \| Gas Utilities and Infrastructure
Goodwill [Line Items]
Goodwill accumulated impairment loss		$ 0