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Derivative Financial Instruments - Summary of Cash Collateral and Letters of Credit (Details) - USD ($) $ in Millions | Sep. 30, 2024 | Dec. 31, 2023
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Derivative Instruments and Hedging Activities Disclosure [Abstract] |  |
Cash collateral posted | $ 917 | $ 2,449
Letters of credit posted | 868 | 777
Cash collateral held | 26 | 64
Letters of credit held | 87 | 61
Additional collateral required in the event of a credit downgrade below investment grade (at BB+/Ba1) | $ 1,873 | $ 1,914

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