Employee Benefit Plans (Contributions to Defined Benefit Pension Plans) (Details) - Pension Plan - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	$ 100	$ 58
Duke Energy Carolinas
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	26	15
Progress Energy
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	22	13
Duke Energy Progress
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	13	8
Duke Energy Florida
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	9	5
Duke Energy Ohio
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	5	3
Duke Energy Indiana
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	8	5
Piedmont
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	$ 3	$ 2