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Commitments, Contingencies and Guarantees (Credit Risk Of Financial Instruments By Contractual Amounts) (Details) - USD ($)
$ in Millions
Mar. 31, 2024
Dec. 31, 2023
Mar. 31, 2023
Dec. 31, 2022
Other Commitments [Line Items]        
Unused commitments to extend credit $ 63,676 $ 63,631    
Standby letters of credit 2,082 1,997    
Commercial letters of credit 78 78    
Liabilities associated with standby letters of credit 31 32    
Assets associated with standby letters of credit 33 34    
Reserve for unfunded credit commitments $ 114 $ 124 $ 124 $ 118