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Fair Value (Details Textuals) - USD ($) $ in Millions | 6 Months Ended |
--- | --- | ---
Jun. 30, 2025 | Dec. 31, 2024
Nuclear decommissioning trust fund | Fixed income securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities with no contractual maturity date | $ 107 |
Equity or debt securities | Minimum |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments, redemption notice period (in days) | 7 days |
Equity or debt securities | Maximum |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments, redemption notice period (in days) | 65 days |
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 | $ 136 | $ 120
Private equity and other | Minimum |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments classified as NAV assets, general contractual durations (in years) | 7 years |
Private equity and other | Maximum |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments classified as NAV assets, general contractual durations (in years) | 12 years |

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