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Related Party Transactions (Intercompany Income Taxes) (Details) - Affiliated Entity [Member] - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
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Duke Energy Carolinas [Member] |  |
Related Party Transaction [Line Items] |  |
Accrued Income Taxes, Current |  | $ 44
Income taxes receivable, current | $ 52 |
Progress Energy [Member] |  |
Related Party Transaction [Line Items] |  |
Income taxes receivable, current | 47 | 168
Duke Energy Progress [Member] |  |
Related Party Transaction [Line Items] |  |
Accrued Income Taxes, Current |  | 21
Income taxes receivable, current | 29 |
Duke Energy Florida [Member] |  |
Related Party Transaction [Line Items] |  |
Accrued Income Taxes, Current | 16 |
Income taxes receivable, current |  | 44
Duke Energy Ohio [Member] |  |
Related Party Transaction [Line Items] |  |
Accrued Income Taxes, Current | 3 |
Income taxes receivable, current |  | 22
Duke Energy Indiana [Member] |  |
Related Party Transaction [Line Items] |  |
Accrued Income Taxes, Current |  | 35
Income taxes receivable, current | 8 |
Piedmont Natural Gas [Member] |  |
Related Party Transaction [Line Items] |  |
Accrued Income Taxes, Current | $ 45 |
Income taxes receivable, current |  | $ 7

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