Debt and Credit Facilities (Schedule of Line of Credit Facilities) (Details) - Master Credit Facility - USD ($)	Sep. 30, 2022	Dec. 31, 2021
Line of Credit Facility [Line Items]
Facility size	$ 9,000,000,000	$ 8,000,000,000
Commercial paper	(3,339,000,000)
Outstanding letters of credit	(38,000,000)
Tax-exempt bonds	(81,000,000)
Available capacity under the Master Credit Facility	5,542,000,000
Duke Energy Carolinas
Line of Credit Facility [Line Items]
Facility size	1,225,000,000
Commercial paper	(827,000,000)
Outstanding letters of credit	(4,000,000)
Available capacity under the Master Credit Facility	394,000,000
Duke Energy Progress
Line of Credit Facility [Line Items]
Facility size	950,000,000
Commercial paper	(150,000,000)
Outstanding letters of credit	(2,000,000)
Available capacity under the Master Credit Facility	798,000,000
Duke Energy Florida
Line of Credit Facility [Line Items]
Facility size	1,350,000,000
Commercial paper	(887,000,000)
Outstanding letters of credit	(7,000,000)
Available capacity under the Master Credit Facility	456,000,000
Duke Energy Ohio
Line of Credit Facility [Line Items]
Facility size	775,000,000
Commercial paper	(476,000,000)
Available capacity under the Master Credit Facility	299,000,000
Duke Energy Indiana
Line of Credit Facility [Line Items]
Facility size	900,000,000
Commercial paper	(586,000,000)
Tax-exempt bonds	(81,000,000)
Available capacity under the Master Credit Facility	233,000,000
Piedmont
Line of Credit Facility [Line Items]
Facility size	800,000,000
Commercial paper	(278,000,000)
Available capacity under the Master Credit Facility	522,000,000
Duke Energy (Parent) | Proceeds loaned to subsidiary registrants
Line of Credit Facility [Line Items]
Commercial paper	(625,000,000)
Duke Energy (Parent) | Duke Energy (Parent)
Line of Credit Facility [Line Items]
Facility size	3,000,000,000
Commercial paper	(135,000,000)
Outstanding letters of credit	(25,000,000)
Available capacity under the Master Credit Facility	$ 2,840,000,000