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Financial and Other Derivative Instruments (Net Cash Collateral Offsetting Arrangements) (Details) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023
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Derivative Instruments and Hedging Activities Disclosure [Abstract] |  |
Cash collateral netted against Derivative assets | $ (2) | $ 0
Cash collateral netted against Derivative liabilities | 49 | 72
Cash collateral recorded in Accounts receivable | 58 | 57
Cash collateral recorded in Accounts payable | (4) | (3)
Total net cash collateral posted (received) | $ 101 | $ 126

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