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Variable Interest Entities (Narrative) (Details) - USD ($) $ in Millions | 9 Months Ended |
--- | --- | ---
Sep. 30, 2024 | Dec. 31, 2023
Variable Interest Entity [Line Items] |  |
Investments | $ 74 | $ 76
Securitization bonds |  |
Variable Interest Entity [Line Items] |  |
Total principal amount outstanding | 715 | 787
Variable Interest Entity, Primary Beneficiary |  |
Variable Interest Entity [Line Items] |  |
Regulatory asset | 695 | 778
Variable Interest Entity, Not Primary Beneficiary |  |
Variable Interest Entity [Line Items] |  |
Investments | $ 69 | $ 74
Variable Interest Entity, Not Primary Beneficiary | T.E.S. Filer City |  |
Variable Interest Entity [Line Items] |  |
Ownership interest | 50.00% |
Variable Interest Entity, Not Primary Beneficiary | Grayling |  |
Variable Interest Entity [Line Items] |  |
Ownership interest | 50.00% |
Variable Interest Entity, Not Primary Beneficiary | Craven |  |
Variable Interest Entity [Line Items] |  |
Ownership interest | 50.00% |
Variable Interest Entity, Not Primary Beneficiary | Genesee |  |
Variable Interest Entity [Line Items] |  |
Ownership interest | 50.00% |

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