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Commitments, Contingencies and Guarantees (Credit Risk Of Financial Instruments By Contractual Amounts) (Details) - USD ($)
$ in Millions
Mar. 31, 2025
Dec. 31, 2024
Mar. 31, 2024
Dec. 31, 2023
Commitments and Contingencies Disclosure [Abstract]        
Unused commitments to extend credit $ 64,347 $ 63,232    
Standby letters of credit 2,140 2,096    
Commercial letters of credit 68 58    
Liabilities associated with standby letters of credit 34 33    
Assets associated with standby letters of credit 36 35    
Reserve for unfunded credit commitments $ 117 $ 116 $ 114 $ 124