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Related Party Transactions (Intercompany Income Taxes) (Details) - Affiliated Entity - USD ($) $ in Millions | Sep. 30, 2020 | Dec. 31, 2019
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Duke Energy Carolinas |  |
Related Party Transaction [Line Items] |  |
Intercompany income tax payable | $ 206 | $ 5
Progress Energy |  |
Related Party Transaction [Line Items] |  |
Intercompany income tax receivable |  | 125
Intercompany income tax payable | 49 |
Duke Energy Progress |  |
Related Party Transaction [Line Items] |  |
Intercompany income tax receivable |  | 28
Intercompany income tax payable | 104 |
Duke Energy Florida |  |
Related Party Transaction [Line Items] |  |
Intercompany income tax payable | 98 | 2
Duke Energy Ohio |  |
Related Party Transaction [Line Items] |  |
Intercompany income tax receivable |  | 9
Intercompany income tax payable | 6 |
Duke Energy Indiana |  |
Related Party Transaction [Line Items] |  |
Intercompany income tax receivable |  | 28
Intercompany income tax payable | 56 |
Piedmont Natural Gas |  |
Related Party Transaction [Line Items] |  |
Intercompany income tax receivable | $ 14 | $ 13

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