Debt and Credit Facilities (Schedule of Line of Credit Facilities) (Details) - Master Credit Facility	Mar. 31, 2023 USD ($)
Line of Credit Facility [Line Items]
Facility size	$ 9,000,000,000
Commercial paper	(3,452,000,000)
Outstanding letters of credit	(39,000,000)
Tax-exempt bonds	(81,000,000)
Available capacity under the Master Credit Facility	5,428,000,000
Duke Energy Carolinas
Line of Credit Facility [Line Items]
Facility size	2,025,000,000
Commercial paper	(1,310,000,000)
Outstanding letters of credit	(4,000,000)
Available capacity under the Master Credit Facility	711,000,000
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	(776,000,000)
Outstanding letters of credit	(7,000,000)
Available capacity under the Master Credit Facility	567,000,000
Duke Energy Ohio
Line of Credit Facility [Line Items]
Facility size	700,000,000
Commercial paper	(93,000,000)
Available capacity under the Master Credit Facility	607,000,000
Duke Energy Indiana
Line of Credit Facility [Line Items]
Facility size	950,000,000
Commercial paper	(328,000,000)
Tax-exempt bonds	(81,000,000)
Available capacity under the Master Credit Facility	541,000,000
Piedmont
Line of Credit Facility [Line Items]
Facility size	800,000,000
Commercial paper	(301,000,000)
Available capacity under the Master Credit Facility	499,000,000
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	(494,000,000)
Outstanding letters of credit	(27,000,000)
Available capacity under the Master Credit Facility	$ 1,754,000,000