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Related Party Transactions (Intercompany Income Taxes) (Details) - Affiliated Entity [Member] - USD ($) $ in Millions | Jun. 30, 2018 | Dec. 31, 2017
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Duke Energy Carolinas [Member] |  |
Related Party Transaction [Line Items] |  |
Income tax payable | $ 22 | $ 44
Progress Energy [Member] |  |
Related Party Transaction [Line Items] |  |
Income taxes receivable | 273 | 168
Duke Energy Progress [Member] |  |
Related Party Transaction [Line Items] |  |
Income tax payable | 24 | 21
Duke Energy Florida [Member] |  |
Related Party Transaction [Line Items] |  |
Income taxes receivable | 140 | 44
Duke Energy Ohio [Member] |  |
Related Party Transaction [Line Items] |  |
Income taxes receivable |  | 22
Income tax payable | 3 |
Duke Energy Indiana [Member] |  |
Related Party Transaction [Line Items] |  |
Income tax payable | 14 | 35
Piedmont Natural Gas [Member] |  |
Related Party Transaction [Line Items] |  |
Income taxes receivable | $ 12 | $ 7

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