Employee Benefit Plans (Plan Contributions) (Details) - Qualified Pension Plans - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Defined Benefit Plan Disclosure [Line Items]
2023000000	$ 100	$ 58
Duke Energy Carolinas
Defined Benefit Plan Disclosure [Line Items]
2023000000	26	15
Progress Energy
Defined Benefit Plan Disclosure [Line Items]
2023000000	22	13
Duke Energy Progress
Defined Benefit Plan Disclosure [Line Items]
2023000000	13	8
Duke Energy Florida
Defined Benefit Plan Disclosure [Line Items]
2023000000	9	5
Duke Energy Ohio
Defined Benefit Plan Disclosure [Line Items]
2023000000	5	3
Duke Energy Indiana
Defined Benefit Plan Disclosure [Line Items]
2023000000	8	5
Piedmont
Defined Benefit Plan Disclosure [Line Items]
2023000000	$ 3	$ 2