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Financial and Other Derivative Instruments (Net Cash Collateral Offsetting Arrangements) (Details) - USD ($) $ in Millions | Sep. 30, 2023 | Dec. 31, 2022
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Derivative Instruments and Hedging Activities Disclosure [Abstract] |  |
Cash collateral netted against Derivative assets | $ 0 | $ (90)
Cash collateral netted against Derivative liabilities | 12 | 113
Cash collateral recorded in Accounts receivable | 52 | 77
Cash collateral recorded in Accounts payable | (15) | (27)
Total net cash collateral posted (received) | $ 49 | $ 73

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