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Financial and Other Derivative Instruments (Net Cash Collateral Offsetting Arrangements) (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
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Derivative Instruments and Hedging Activities Disclosure [Abstract] |  |
Cash collateral netted against Derivative assets | $ (35) | $ (17)
Cash collateral recorded in Accounts receivable | 60 | 29
Cash collateral recorded in Accounts payable | (33) | (5)
Total net cash collateral posted (received) | $ (8) | $ 7

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