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Related Party Transactions (Intercompany Income Taxes) (Details) - Affiliated entity - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
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Duke Energy Carolinas |  |
Related Party Transaction [Line Items] |  |
Intercompany income tax payable | $ 62 | $ 31
Progress Energy |  |
Related Party Transaction [Line Items] |  |
Intercompany income tax payable |  | 33
Duke Energy Progress |  |
Related Party Transaction [Line Items] |  |
Intercompany income tax payable | 84 | 46
Duke Energy Florida |  |
Related Party Transaction [Line Items] |  |
Intercompany income tax receivable | 40 |
Intercompany income tax payable |  | 35
Duke Energy Ohio |  |
Related Party Transaction [Line Items] |  |
Intercompany income tax receivable | 19 |
Intercompany income tax payable |  | 2
Duke Energy Indiana |  |
Related Party Transaction [Line Items] |  |
Intercompany income tax receivable |  | 9
Intercompany income tax payable | 10 |
Piedmont |  |
Related Party Transaction [Line Items] |  |
Intercompany income tax receivable |  | $ 10
Intercompany income tax payable | $ 27 |

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