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Income Taxes (Narrative) (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended	9 Months Ended
	Oct. 31, 2024	Sep. 30, 2023	Sep. 30, 2023	Sep. 30, 2024
Tax Credit Carryforward [Line Items]
Increase in ETR		$ 120	$ 120
Duke Energy Carolinas
Tax Credit Carryforward [Line Items]
Deferred tax asset				$ 325
Duke Energy Carolinas | Subsequent event
Tax Credit Carryforward [Line Items]
Tax credits	$ 174
Duke Energy Carolinas | Subsequent event | Sale of Nuclear Power PTCs
Tax Credit Carryforward [Line Items]
Decrease in deferred tax asset	$ 150
Duke Energy Progress
Tax Credit Carryforward [Line Items]
Deferred tax asset				$ 59

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- Definition

Amount, after allocation of valuation allowances and deferred tax liability, of deferred tax asset attributable to deductible differences and carryforwards, without jurisdictional netting.

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