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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
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)