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Trust Investments - Fair Values And Gross Unrealized Gains And Losses For The Securities Held (Parenthetical) (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
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Nuclear Decommissioning Trust (NDT) Fund [Member] |  |
Debt Securities, Available-for-Sale [Line Items] |  |
NDT Fund Foreign Currency | $ 24 | $ 24

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