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