Debt and Credit Facilities (Schedule of Line of Credit Facilities) (Details) - USD ($)	Dec. 31, 2023	Mar. 31, 2023	Dec. 31, 2022
Line of Credit Facility [Line Items]
Tax-exempt bonds	$ (1,331,000,000)		$ (1,331,000,000)
Duke Energy Progress
Line of Credit Facility [Line Items]
Tax-exempt bonds	(500,000,000)		(500,000,000)
Duke Energy Ohio
Line of Credit Facility [Line Items]
Tax-exempt bonds	(77,000,000)		(77,000,000)
Duke Energy Indiana
Line of Credit Facility [Line Items]
Tax-exempt bonds	(352,000,000)		$ (352,000,000)
Revolving Credit Facility
Line of Credit Facility [Line Items]
Facility size	9,000,000,000	$ 9,000,000,000
Commercial paper	(3,941,000,000)
Outstanding letters of credit	(39,000,000)
Tax-exempt bonds	(81,000,000)
Available capacity	4,939,000,000
Revolving Credit Facility | Duke Energy Carolinas
Line of Credit Facility [Line Items]
Facility size	1,575,000,000
Commercial paper	(968,000,000)
Outstanding letters of credit	(4,000,000)
Available capacity	603,000,000
Revolving Credit Facility | Duke Energy Progress
Line of Credit Facility [Line Items]
Facility size	1,400,000,000
Commercial paper	(1,041,000,000)
Outstanding letters of credit	(1,000,000)
Available capacity	358,000,000
Revolving Credit Facility | Duke Energy Florida
Line of Credit Facility [Line Items]
Facility size	950,000,000
Commercial paper	(152,000,000)
Outstanding letters of credit	(7,000,000)
Available capacity	791,000,000
Revolving Credit Facility | Duke Energy Ohio
Line of Credit Facility [Line Items]
Facility size	1,050,000,000
Commercial paper	(638,000,000)
Available capacity	412,000,000
Revolving Credit Facility | Duke Energy Indiana
Line of Credit Facility [Line Items]
Facility size	950,000,000
Commercial paper	(406,000,000)
Tax-exempt bonds	(81,000,000)
Available capacity	463,000,000
Revolving Credit Facility | Piedmont
Line of Credit Facility [Line Items]
Facility size	800,000,000
Commercial paper	(538,000,000)
Available capacity	262,000,000
Revolving Credit Facility | Parent Company
Line of Credit Facility [Line Items]
Facility size	2,275,000,000
Commercial paper	(198,000,000)
Outstanding letters of credit	(27,000,000)
Available capacity	2,050,000,000
Revolving Credit Facility | Parent Company | Proceeds Loaned To Subsidiary Registrants
Line of Credit Facility [Line Items]
Commercial paper	$ (625,000,000)