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Fair Value (Details Textuals) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2024 | Dec. 31, 2023
Nuclear decommissioning trusts | Fixed Income Securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities with no contractual maturity date | $ 112 |
Private Equity and Other |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Unfunded commitments related to investments classified as NAV assets | $ 120 | $ 157
Minimum | Equity or debt securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments, redemption notice period | 7 days |
Minimum | Private Equity and Other |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments classified as NAV assets, general contractual durations | 7 years |
Maximum | Equity or debt securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments, redemption notice period | 65 days |
Maximum | Private Equity and Other |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments classified as NAV assets, general contractual durations | 12 years |

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