Derivatives and Hedging (Derivative Instruments with Credit-Risk Related Contingent Features and Cash Collateral) (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Schedule of Information Regarding Derivative Instruments That Contain Credit-Risk Related Contingent Features
Aggregate fair value of derivatives in a net liability position	$ 141	$ 32
Additional cash collateral or letters of credit in the event credit risk-related contingent features were triggered	141	32
Duke Energy Carolinas
Schedule of Information Regarding Derivative Instruments That Contain Credit-Risk Related Contingent Features
Aggregate fair value of derivatives in a net liability position	86	18
Additional cash collateral or letters of credit in the event credit risk-related contingent features were triggered	86	18
Progress Energy
Schedule of Information Regarding Derivative Instruments That Contain Credit-Risk Related Contingent Features
Aggregate fair value of derivatives in a net liability position	55	14
Additional cash collateral or letters of credit in the event credit risk-related contingent features were triggered	55	14
Duke Energy Progress
Schedule of Information Regarding Derivative Instruments That Contain Credit-Risk Related Contingent Features
Aggregate fair value of derivatives in a net liability position	48	10
Additional cash collateral or letters of credit in the event credit risk-related contingent features were triggered	48	10
Duke Energy Florida
Schedule of Information Regarding Derivative Instruments That Contain Credit-Risk Related Contingent Features
Aggregate fair value of derivatives in a net liability position	7	4
Additional cash collateral or letters of credit in the event credit risk-related contingent features were triggered	$ 7	$ 4