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Summary of Significant Accounting Policies (Other Assets and Liabilities) (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Current Assets |  |
Organization And Basis Of Presentation [Line Items] |  |
Taxes receivable | $ 357 | $ 729
Current Liabilities |  |
Organization And Basis Of Presentation [Line Items] |  |
Accrued compensation | 862 | 793
Duke Energy Carolinas | Current Liabilities |  |
Organization And Basis Of Presentation [Line Items] |  |
Accrued compensation | 271 | 251
Other accrued liabilities | 147 | 55
Progress Energy | Current Liabilities |  |
Organization And Basis Of Presentation [Line Items] |  |
Customer deposits | 354 | 345
Duke Energy Florida | Current Liabilities |  |
Organization And Basis Of Presentation [Line Items] |  |
Other accrued liabilities | 89 | 85
Customer deposits | 209 | 208
Duke Energy Indiana | Current Assets |  |
Organization And Basis Of Presentation [Line Items] |  |
Taxes receivable | 44 | 9
Duke Energy Indiana | Current Liabilities |  |
Organization And Basis Of Presentation [Line Items] |  |
Customer deposits | $ 49 | $ 47

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