Summary of Significant Accounting Policies (Other Assets and Liabilities) (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Duke Energy Carolinas \| Current Liabilities
Organization And Basis Of Presentation [Line Items]
Accrued compensation	$ 224	$ 247
Duke Energy Florida \| Current Liabilities
Organization And Basis Of Presentation [Line Items]
Customer deposits/Collateral liabilities	168	200
Duke Energy Ohio \| Current Assets
Organization And Basis Of Presentation [Line Items]
Gas Storage	23	57
Tax receivables	95	4
Duke Energy Indiana \| Current Liabilities
Organization And Basis Of Presentation [Line Items]
Customer advances	87	51
Duke Energy Indiana \| Current Assets
Organization And Basis Of Presentation [Line Items]
Mark-to-market transactions	$ 18	$ 110

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