Debt and Credit Facilities (Schedule of Line of Credit Facilities) (Details) - Master Credit Facility - USD ($)	Sep. 30, 2023	Mar. 31, 2023
Line of Credit Facility [Line Items]
Facility size	$ 9,000,000,000	$ 9,000,000,000
Commercial paper	(2,815,000,000)
Outstanding letters of credit	(39,000,000)
Tax-exempt bonds	(81,000,000)
Available capacity under the Master Credit Facility	6,065,000,000
Duke Energy Carolinas
Line of Credit Facility [Line Items]
Facility size	1,575,000,000
Commercial paper	(631,000,000)
Outstanding letters of credit	(4,000,000)
Available capacity under the Master Credit Facility	940,000,000
Duke Energy Progress
Line of Credit Facility [Line Items]
Facility size	1,400,000,000
Commercial paper	(841,000,000)
Outstanding letters of credit	(1,000,000)
Available capacity under the Master Credit Facility	558,000,000
Duke Energy Florida
Line of Credit Facility [Line Items]
Facility size	1,250,000,000
Commercial paper	(292,000,000)
Outstanding letters of credit	(7,000,000)
Available capacity under the Master Credit Facility	951,000,000
Duke Energy Ohio
Line of Credit Facility [Line Items]
Facility size	750,000,000
Commercial paper	(298,000,000)
Available capacity under the Master Credit Facility	452,000,000
Duke Energy Indiana
Line of Credit Facility [Line Items]
Facility size	950,000,000
Commercial paper	(350,000,000)
Tax-exempt bonds	(81,000,000)
Available capacity under the Master Credit Facility	519,000,000
Piedmont
Line of Credit Facility [Line Items]
Facility size	800,000,000
Commercial paper	(297,000,000)
Available capacity under the Master Credit Facility	503,000,000
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	2,275,000,000
Commercial paper	(106,000,000)
Outstanding letters of credit	(27,000,000)
Available capacity under the Master Credit Facility	$ 2,142,000,000