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Commodity Derivatives - Contingent Features (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
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Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Additional Collateral, Aggregate Fair Value | $ 12 |
Collateral Already Posted, Aggregate Fair Value | $ 211 | $ 288

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