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Derivative Financial Instruments - Summary of Cash Collateral and Letters of Credit (Details) - USD ($) $ in Millions | Mar. 31, 2025 | Dec. 31, 2024
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Derivative Instruments and Hedging Activities Disclosure [Abstract] |  |
Cash collateral posted | $ 1,121 | $ 635
Letters of credit posted | 769 | 890
Cash collateral held | 58 | 49
Letters of credit held | 120 | 91
Additional collateral required in the event of a credit downgrade below investment grade (at BB+/Ba1) | $ 2,254 | $ 1,949

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- Definition Incremental collateral amount required to be provided related to its financial instruments, including derivatives, non-derivatives, normal purchase normal sales contracts and applicable payables and receivables, if the credit rating is downgraded below investment grade. + References No definition available. + Details
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