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Related Party Transactions (Intercompany Income Taxes) (Details) - Affiliated Entity - USD ($) $ in Millions | Mar. 31, 2022 | Dec. 31, 2021
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Duke Energy Carolinas |  |
Related Party Transaction [Line Items] |  |
Intercompany income tax receivable | $ 20 |
Intercompany income tax payable |  | $ 62
Progress Energy |  |
Related Party Transaction [Line Items] |  |
Intercompany income tax receivable | 49 |
Duke Energy Progress |  |
Related Party Transaction [Line Items] |  |
Intercompany income tax payable | 15 | 84
Duke Energy Florida |  |
Related Party Transaction [Line Items] |  |
Intercompany income tax receivable | 9 | 40
Duke Energy Ohio |  |
Related Party Transaction [Line Items] |  |
Intercompany income tax receivable | 5 | 19
Duke Energy Indiana |  |
Related Party Transaction [Line Items] |  |
Intercompany income tax payable | 44 | 10
Piedmont |  |
Related Party Transaction [Line Items] |  |
Intercompany income tax payable | $ 45 | $ 27

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