Employee Benefit Plans (Employee Savings Plans) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	$ 238	$ 246	$ 229
Duke Energy Carolinas
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	75	76	70
Progress Energy
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	62	65	60
Duke Energy Progress
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	40	43	39
Duke Energy Florida
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	22	22	21
Duke Energy Ohio
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	6	6	5
Duke Energy Indiana
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	13	12	12
Piedmont
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	$ 13	$ 13	$ 11