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Summary of Significant Accounting Policies (Other Assets and Liabilities) (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024
Duke Energy Carolinas | Current Liabilities
Organization And Basis Of Presentation [Line Items]
Accrued compensation	$ 302	$ 234
Progress Energy | Current Liabilities
Organization And Basis Of Presentation [Line Items]
Customer deposits/Collateral liabilities	293	281
Duke Energy Progress | Current Liabilities
Organization And Basis Of Presentation [Line Items]
Accrued compensation	143	114
Duke Energy Florida | Current Liabilities
Organization And Basis Of Presentation [Line Items]
Customer deposits/Collateral liabilities	191	164
Duke Energy Florida | Current Assets
Organization And Basis Of Presentation [Line Items]
Tax receivables	12	166
Duke Energy Indiana | Current Liabilities
Organization And Basis Of Presentation [Line Items]
Customer advances	$ 117	$ 100

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