Debt and Credit Facilities (Schedule of Line of Credit Facilities) (Details) - Master Credit Facility - USD ($)	Jun. 30, 2022	Dec. 31, 2021
Line of Credit Facility [Line Items]
Facility size	$ 9,000,000,000	$ 8,000,000,000
Commercial paper	(3,516,000,000)
Outstanding letters of credit	(38,000,000)
Tax-exempt bonds	(81,000,000)
Available capacity under the Master Credit Facility	5,365,000,000
Duke Energy Carolinas
Line of Credit Facility [Line Items]
Facility size	1,225,000,000
Commercial paper	(326,000,000)
Outstanding letters of credit	(4,000,000)
Available capacity under the Master Credit Facility	895,000,000
Duke Energy Progress
Line of Credit Facility [Line Items]
Facility size	1,200,000,000
Commercial paper	(150,000,000)
Outstanding letters of credit	(2,000,000)
Available capacity under the Master Credit Facility	1,048,000,000
Duke Energy Florida
Line of Credit Facility [Line Items]
Facility size	1,100,000,000
Commercial paper	(458,000,000)
Outstanding letters of credit	(7,000,000)
Available capacity under the Master Credit Facility	635,000,000
Duke Energy Ohio
Line of Credit Facility [Line Items]
Facility size	775,000,000
Commercial paper	(299,000,000)
Available capacity under the Master Credit Facility	476,000,000
Duke Energy Indiana
Line of Credit Facility [Line Items]
Facility size	750,000,000
Commercial paper	(400,000,000)
Tax-exempt bonds	(81,000,000)
Available capacity under the Master Credit Facility	269,000,000
Piedmont
Line of Credit Facility [Line Items]
Facility size	800,000,000
Commercial paper	(30,000,000)
Available capacity under the Master Credit Facility	770,000,000
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	3,150,000,000
Commercial paper	(1,853,000,000)
Outstanding letters of credit	(25,000,000)
Available capacity under the Master Credit Facility	$ 1,272,000,000