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Related Party Transactions (Intercompany Income Taxes) (Details) - Affiliated entity - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Duke Energy Carolinas |  |
Related Party Transaction [Line Items] |  |
Intercompany income tax payable | $ 31 | $ 5
Progress Energy |  |
Related Party Transaction [Line Items] |  |
Intercompany income tax receivable |  | 125
Intercompany income tax payable | 33 |
Duke Energy Progress |  |
Related Party Transaction [Line Items] |  |
Intercompany income tax receivable |  | 28
Intercompany income tax payable | 46 |
Duke Energy Florida |  |
Related Party Transaction [Line Items] |  |
Intercompany income tax payable | 35 | 2
Duke Energy Ohio |  |
Related Party Transaction [Line Items] |  |
Intercompany income tax receivable |  | 9
Intercompany income tax payable | 2 |
Duke Energy Indiana |  |
Related Party Transaction [Line Items] |  |
Intercompany income tax receivable | 9 | 28
Piedmont |  |
Related Party Transaction [Line Items] |  |
Intercompany income tax receivable | $ 10 | $ 13

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