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Debt and Credit Facilities (Schedule of Line of Credit Facilities) (Details) - USD ($)	Dec. 31, 2025	Mar. 31, 2025	Feb. 28, 2025	Dec. 31, 2024
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	10,000,000,000	$ 10,000,000,000	$ 9,000,000,000
Commercial paper	(2,144,000,000)
Outstanding letters of credit	(7,000,000)
Tax-exempt bonds	(81,000,000)
Available capacity	7,768,000,000
Revolving Credit Facility \| Duke Energy Carolinas
Line of Credit Facility [Line Items]
Facility size	1,650,000,000
Commercial paper	(300,000,000)
Outstanding letters of credit	(4,000,000)
Available capacity	1,346,000,000
Revolving Credit Facility \| Duke Energy Progress
Line of Credit Facility [Line Items]
Facility size	1,675,000,000
Commercial paper	(150,000,000)
Outstanding letters of credit	(1,000,000)
Available capacity	1,524,000,000
Revolving Credit Facility \| Duke Energy Florida
Line of Credit Facility [Line Items]
Facility size	700,000,000
Available capacity	700,000,000
Revolving Credit Facility \| Duke Energy Ohio
Line of Credit Facility [Line Items]
Facility size	700,000,000
Commercial paper	(34,000,000)
Available capacity	666,000,000
Revolving Credit Facility \| Duke Energy Indiana
Line of Credit Facility [Line Items]
Facility size	850,000,000
Commercial paper	(260,000,000)
Tax-exempt bonds	(81,000,000)
Available capacity	509,000,000
Revolving Credit Facility \| Piedmont
Line of Credit Facility [Line Items]
Facility size	1,000,000,000
Commercial paper	(381,000,000)
Available capacity	619,000,000
Revolving Credit Facility \| Parent Company
Line of Credit Facility [Line Items]
Facility size	3,425,000,000
Commercial paper	(1,019,000,000)
Outstanding letters of credit	(2,000,000)
Available capacity	2,404,000,000
Revolving Credit Facility \| Parent Company \| Proceeds Loaned To Subsidiary Registrants
Line of Credit Facility [Line Items]
Commercial paper	$ (625,000,000)