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