Debt and Credit Facilities (Schedule of Other Credit Facilities) (Details) - USD ($)	1 Months Ended		6 Months Ended
	May 31, 2020	Mar. 31, 2020	Jun. 30, 2020	Jun. 30, 2019
Line of Credit Facility [Line Items]
Repayments of long-term debt			$ 1,951,000,000	$ 2,155,000,000
Master Credit Facility
Line of Credit Facility [Line Items]
Facility size		$ 8,000,000,000	8,000,000,000
Duke Energy (Parent) | Master Credit Facility
Line of Credit Facility [Line Items]
Repayments of long-term debt			500,000,000
Duke Energy Progress
Line of Credit Facility [Line Items]
Repayments of long-term debt			13,000,000	$ 602,000,000
Duke Energy Progress | Master Credit Facility
Line of Credit Facility [Line Items]
Facility size			1,250,000,000
Duke Energy Progress | Term Loan Facility
Line of Credit Facility [Line Items]
Facility size			700,000,000
Amount drawn			$ 700,000,000
Duke Energy (Parent) Three-Year Revolving Credit Facility | Master Credit Facility
Line of Credit Facility [Line Items]
Facility Term			3 years
Additional amount drawn		$ 500,000,000
Repayments of long-term debt	$ 500,000,000
Duke Energy (Parent) Three-Year Revolving Credit Facility | Duke Energy (Parent) | Master Credit Facility
Line of Credit Facility [Line Items]
Facility size			$ 1,000,000,000
Amount drawn			$ 500,000,000