Debt and Credit Facilities (Narrative) (Details) - USD ($)		1 Months Ended	3 Months Ended
	Mar. 09, 2022	Mar. 31, 2022	Mar. 31, 2022	Mar. 31, 2021
Master Credit Facility
Debt Instrument [Line Items]
Facility size		$ 9,000,000,000	$ 9,000,000,000	$ 8,000,000,000
Master Credit Facility | Term Loan Facility | Duke Energy (Parent)
Debt Instrument [Line Items]
Facility size	$ 1,400,000,000
Extension period	2 years
Master Credit Facility | Term Loan Facility | Progress Energy
Debt Instrument [Line Items]
Amount of debt closed		$ 2,500,000,000
June 2017 Three Year Revolving Credit Facility
Debt Instrument [Line Items]
Facility term			3 years