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Summary of Significant Accounting Policies (Other Assets and Liabilities) (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Current Liabilities |  |
Organization And Basis Of Presentation [Line Items] |  |
Other accrued liabilities | $ 1,455 | $ 604
Accrued compensation | 662 | 862
Duke Energy Carolinas | Current Liabilities |  |
Organization And Basis Of Presentation [Line Items] |  |
Other accrued liabilities | 178 | 147
Accrued compensation | 213 | 271
Progress Energy | Current Liabilities |  |
Organization And Basis Of Presentation [Line Items] |  |
Customer deposits | 347 | 354
Duke Energy Florida | Current Liabilities |  |
Organization And Basis Of Presentation [Line Items] |  |
Customer deposits | 203 | 209
Duke Energy Ohio | Current Assets |  |
Organization And Basis Of Presentation [Line Items] |  |
Gas Storage | 21 | 0
Duke Energy Indiana | Current Assets |  |
Organization And Basis Of Presentation [Line Items] |  |
Income taxes receivable | $ 9 | $ 44

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