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(Other Assets and Liabilities) (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Current Assets, Other [Member] |  |
Organization And Basis Of Presentation [Line Items] |  |
Income taxes receivable | $ 729 | $ 330
Current Liabilities, Other [Member] |  |
Organization And Basis Of Presentation [Line Items] |  |
Accrued compensation | 793 | 757
Duke Energy Carolinas [Member] | Current Liabilities, Other [Member] |  |
Organization And Basis Of Presentation [Line Items] |  |
Accrued compensation | 251 | 252
Progress Energy [Member] | Current Assets, Other [Member] |  |
Organization And Basis Of Presentation [Line Items] |  |
Income taxes receivable | 66 | 278
Progress Energy [Member] | Current Liabilities, Other [Member] |  |
Organization And Basis Of Presentation [Line Items] |  |
Customer deposits | 345 | 338
Duke Energy Progress [Member] | Current Liabilities, Other [Member] |  |
Organization And Basis Of Presentation [Line Items] |  |
Customer deposits | 137 | 129
Accrued compensation | 130 | 132
Duke Energy Florida [Member] | Current Liabilities, Other [Member] |  |
Organization And Basis Of Presentation [Line Items] |  |
Customer deposits | 208 | 208
Accrued compensation | 85 | 16
Duke Energy Ohio [Member] | Current Assets, Other [Member] |  |
Organization And Basis Of Presentation [Line Items] |  |
Income taxes receivable | 13 | 36
Duke Energy Ohio [Member] | Current Liabilities, Other [Member] |  |
Organization And Basis Of Presentation [Line Items] |  |
Customer deposits | 44 | 46
Duke Energy Indiana [Member] | Current Liabilities, Other [Member] |  |
Organization And Basis Of Presentation [Line Items] |  |
Customer deposits | 47 | 45
Piedmont Natural Gas [Member] | Current Assets, Other [Member] |  |
Organization And Basis Of Presentation [Line Items] |  |
Income taxes receivable | $ 11 | $ 43

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