Debt and Credit Facilities (Summary of Current Maturities of Long-term Debt) (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Debt Instrument [Line Items]
Current maturities of long-term debt	$ 2,800	$ 3,878
Duke Energy Florida
Debt Instrument [Line Items]
Current maturities of long-term debt	$ 589	$ 328
Unsecured Debt | Parent | Debt Maturing March 2024, 6.048% Coupon
Debt Instrument [Line Items]
Interest rate (as a percent)	6.157%
Current maturities of long-term debt	$ 1,000
Unsecured Debt | Parent | Debt Maturing April 2024, 3.75% Coupon
Debt Instrument [Line Items]
Interest rate (as a percent)	3.75%
Current maturities of long-term debt	$ 1,000
First Mortgage Bonds | Duke Energy Florida | Debt Maturing October 2073, 34.960% Coupon
Debt Instrument [Line Items]
Interest rate (as a percent)	4.96%
Current maturities of long-term debt	$ 200
Other
Debt Instrument [Line Items]
Current maturities of long-term debt	$ 600