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Derivative Financial Instruments - Additional Information (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
Derivative          
Collateral held for derivative assets $ 1,600,000,000   $ 1,600,000,000   $ 576,000,000
Amount of variation margin payment applied to derivative asset contracts 412,000,000   412,000,000   270,000,000
Valuation adjustments related to the credit risk associated with counterparties of customer accommodation derivative contracts 5,000,000   5,000,000   6,000,000
Amount of variation margin payment applied to derivative liability contracts 649,000,000   649,000,000   415,000,000
Gain or losses reclassified from AOCI into earnings associated with the discontinuance of cash flow hedges 0 $ 0 0 $ 0  
Total collateral          
Derivative          
Collateral held for derivative liabilities 2,000,000,000.0   $ 2,000,000,000.0   868,000,000
Interest rate contracts          
Derivative          
Maximum length of time of hedging exposure     67 months    
Deferred loss, net of tax, on cash flow hedges recorded in accumulated other comprehensive income 395,000,000   $ 395,000,000   275,000,000
Net deferred loss, net of tax, recorded in AOCI are expected to be reclassified into earnings 146,000,000   146,000,000    
Interest rate contracts | Credit Risk          
Derivative          
Notional amount of the risk participations agreements 3,600,000,000   3,600,000,000   3,200,000,000
Fair value of risk participation agreements $ 9,000,000   $ 9,000,000   $ 4,000,000