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Summary of Significant Accounting Policies (Other Assets and Liabilities) (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Current Liabilities |  |
Organization And Basis Of Presentation [Line Items] |  |
Accrued compensation | $ 915 | $ 662
Other accrued liabilities | 649 | 1,455
Duke Energy Carolinas | Current Liabilities |  |
Organization And Basis Of Presentation [Line Items] |  |
Accrued compensation | 277 | 213
Duke Energy Progress | Current Liabilities |  |
Organization And Basis Of Presentation [Line Items] |  |
Other accrued liabilities | 163 | 132
Customer deposits | 144 | 144
Duke Energy Florida | Current Liabilities |  |
Organization And Basis Of Presentation [Line Items] |  |
Other accrued liabilities | 89 | 81
Customer deposits | 200 | 203
Duke Energy Ohio | Current Liabilities |  |
Organization And Basis Of Presentation [Line Items] |  |
Collateral liabilities | 57 | 41
Duke Energy Ohio | Current Assets |  |
Organization And Basis Of Presentation [Line Items] |  |
Gas Storage | $ 25 | $ 21

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