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Commitments and Contingencies (Narrative) (Details) $ in Millions	Mar. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Feb. 28, 2021 case
Texas Storm Uri Tort Litigation \| Pending Litigation
Loss Contingencies [Line Items]
Loss contingency, pending claims, number \| case			5
Duke Energy Carolinas \| Asbestos-related Injuries and Damages Claims
Loss Contingencies [Line Items]
Asbestos-related injuries and damages reserves	$ 417	$ 423
Probable insurance recoveries	572	572
Duke Energy and Duke Energy Carolinas \| ASU 2016-13
Loss Contingencies [Line Items]
Reserve for credit losses for insurance receivables	$ 9	$ 9