Debt and Credit Facilities (Schedule of Line of Credit Facilities) (Details) - Master Credit Facility - USD ($)	Jun. 30, 2023	Mar. 31, 2023
Line of Credit Facility [Line Items]
Facility size	$ 9,000,000,000	$ 9,000,000,000
Commercial paper	(3,143,000,000)
Outstanding letters of credit	(39,000,000)
Tax-exempt bonds	(81,000,000)
Available capacity under the Master Credit Facility	5,737,000,000
Duke Energy Carolinas
Line of Credit Facility [Line Items]
Facility size	2,025,000,000
Commercial paper	(829,000,000)
Outstanding letters of credit	(4,000,000)
Available capacity under the Master Credit Facility	1,192,000,000
Duke Energy Progress
Line of Credit Facility [Line Items]
Facility size	900,000,000
Commercial paper	(150,000,000)
Outstanding letters of credit	(1,000,000)
Available capacity under the Master Credit Facility	749,000,000
Duke Energy Florida
Line of Credit Facility [Line Items]
Facility size	1,350,000,000
Commercial paper	(759,000,000)
Outstanding letters of credit	(7,000,000)
Available capacity under the Master Credit Facility	584,000,000
Duke Energy Ohio
Line of Credit Facility [Line Items]
Facility size	700,000,000
Commercial paper	(132,000,000)
Available capacity under the Master Credit Facility	568,000,000
Duke Energy Indiana
Line of Credit Facility [Line Items]
Facility size	950,000,000
Commercial paper	(341,000,000)
Tax-exempt bonds	(81,000,000)
Available capacity under the Master Credit Facility	528,000,000
Piedmont
Line of Credit Facility [Line Items]
Facility size	800,000,000
Commercial paper	(95,000,000)
Available capacity under the Master Credit Facility	705,000,000
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	(837,000,000)
Outstanding letters of credit	(27,000,000)
Available capacity under the Master Credit Facility	$ 1,411,000,000