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Commitments and Contingencies (Narrative) (Details) $ in Millions	Dec. 20, 2024 plaintiff	Sep. 30, 2025 USD ($)	Jul. 31, 2025	Dec. 31, 2024 USD ($)
Mooresville Coal Ash Class Action Litigation
Loss Contingencies [Line Items]
Number of plaintiffs \| plaintiff	15
Duke Energy Carolinas \| Asbestos-related Injuries and Damages Claims
Loss Contingencies [Line Items]
Asbestos-related injuries and damages reserves		$ 404		$ 396
Probable insurance recoveries		557		539
Duke Energy and Duke Energy Carolinas
Loss Contingencies [Line Items]
Reserve for credit losses for insurance receivables		$ 9		$ 9
Duke Energy Indiana
Loss Contingencies [Line Items]
Settlement disbursement period			1 year