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Debt and Credit Facilities (Schedule of Line of Credit Facilities) (Details) - Revolving Credit Facility - USD ($)	Jun. 30, 2025	Mar. 31, 2025	Feb. 28, 2025
Line of Credit Facility [Line Items]
Facility size	$ 10,000,000,000	$ 10,000,000,000	$ 9,000,000,000
Commercial paper	(3,017,000,000)
Outstanding letters of credit	(14,000,000)
Tax-exempt bonds	(81,000,000)
Available capacity under the Master Credit Facility	6,888,000,000
Duke Energy Carolinas
Line of Credit Facility [Line Items]
Facility size	1,000,000,000
Commercial paper	(300,000,000)
Outstanding letters of credit	(4,000,000)
Tax-exempt bonds	0
Available capacity under the Master Credit Facility	696,000,000
Duke Energy Progress
Line of Credit Facility [Line Items]
Facility size	1,125,000,000
Commercial paper	(150,000,000)
Outstanding letters of credit	(1,000,000)
Tax-exempt bonds	0
Available capacity under the Master Credit Facility	974,000,000
Duke Energy Florida
Line of Credit Facility [Line Items]
Facility size	1,150,000,000
Commercial paper	(1,000,000)
Outstanding letters of credit	(7,000,000)
Tax-exempt bonds	0
Available capacity under the Master Credit Facility	1,142,000,000
Duke Energy Ohio
Line of Credit Facility [Line Items]
Facility size	950,000,000
Commercial paper	(26,000,000)
Outstanding letters of credit	0
Tax-exempt bonds	0
Available capacity under the Master Credit Facility	924,000,000
Duke Energy Indiana
Line of Credit Facility [Line Items]
Facility size	800,000,000
Commercial paper	(150,000,000)
Outstanding letters of credit	0
Tax-exempt bonds	(81,000,000)
Available capacity under the Master Credit Facility	569,000,000
Piedmont
Line of Credit Facility [Line Items]
Facility size	1,050,000,000
Commercial paper	(5,000,000)
Outstanding letters of credit	0
Tax-exempt bonds	0
Available capacity under the Master Credit Facility	1,045,000,000
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	3,925,000,000
Commercial paper	(2,385,000,000)
Outstanding letters of credit	(2,000,000)
Tax-exempt bonds	0
Available capacity under the Master Credit Facility	$ 1,538,000,000