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Derivative Financial Instruments - Amounts Related to Cash Flow Hedges (Details) - Cash Flow Hedges - Interest Rate Contracts - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
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Jun. 30, 2026 | Jun. 30, 2025 | Jun. 30, 2026 | Jun. 30, 2025
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Pre-tax gain (loss) recognized in OCI: | $ (663) | $ 267 | $ (1,223) | $ 736
Pre-tax gain (loss) reclassified from AOCI into interest income: | $ (54) | $ (92) | $ (91) | $ (185)

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