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Employee Benefit Plans - Plan Contributions (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024
Duke Energy Carolinas
Defined Benefit Plan Disclosure [Line Items]
Contributions made	$ 0
Progress Energy
Defined Benefit Plan Disclosure [Line Items]
Contributions made	0
Duke Energy Progress
Defined Benefit Plan Disclosure [Line Items]
Contributions made	0
Duke Energy Florida
Defined Benefit Plan Disclosure [Line Items]
Contributions made	0
Duke Energy Ohio
Defined Benefit Plan Disclosure [Line Items]
Contributions made	0
Duke Energy Indiana
Defined Benefit Plan Disclosure [Line Items]
Contributions made	0
Piedmont
Defined Benefit Plan Disclosure [Line Items]
Contributions made	0
Qualified Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Contributions made	$ 0	$ 100
Qualified Pension Plans | Duke Energy Carolinas
Defined Benefit Plan Disclosure [Line Items]
Contributions made		26
Qualified Pension Plans | Progress Energy
Defined Benefit Plan Disclosure [Line Items]
Contributions made		23
Qualified Pension Plans | Duke Energy Progress
Defined Benefit Plan Disclosure [Line Items]
Contributions made		14
Qualified Pension Plans | Duke Energy Florida
Defined Benefit Plan Disclosure [Line Items]
Contributions made		9
Qualified Pension Plans | Duke Energy Ohio
Defined Benefit Plan Disclosure [Line Items]
Contributions made		5
Qualified Pension Plans | Duke Energy Indiana
Defined Benefit Plan Disclosure [Line Items]
Contributions made		8
Qualified Pension Plans | Piedmont
Defined Benefit Plan Disclosure [Line Items]
Contributions made		$ 3

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