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Related Party Transactions (Intercompany Income Taxes) (Details) - Affiliated Entity - USD ($) $ in Millions | Jun. 30, 2022 | Dec. 31, 2021
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Duke Energy Carolinas |  |
Related Party Transaction [Line Items] |  |
Intercompany income tax receivable | $ 17 |
Intercompany income tax payable |  | $ 62
Progress Energy |  |
Related Party Transaction [Line Items] |  |
Intercompany income tax payable | 22 |
Duke Energy Progress |  |
Related Party Transaction [Line Items] |  |
Intercompany income tax payable | 29 | 84
Duke Energy Florida |  |
Related Party Transaction [Line Items] |  |
Intercompany income tax receivable |  | 40
Intercompany income tax payable | 54 |
Duke Energy Ohio |  |
Related Party Transaction [Line Items] |  |
Intercompany income tax receivable | 2 | 19
Duke Energy Indiana |  |
Related Party Transaction [Line Items] |  |
Intercompany income tax payable | 17 | 10
Piedmont |  |
Related Party Transaction [Line Items] |  |
Intercompany income tax receivable | $ 19 |
Intercompany income tax payable |  | $ 27

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