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Derivative Financial Instruments - Net Gains (Losses) Relating to Derivative Instruments Designated as Cash Flow Hedges (Details) - Cash Flow Hedging - Income Statement Location [Axis]: us-gaap:InterestIncomeExpenseNet - 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]        
Amount of pre-tax net (losses) gains recognized in OCI $ (118) $ 144 $ (199) $ 399
Amount of pre-tax net losses reclassified from OCI into net income $ (21) $ (50) $ (42) $ (105)