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Commitments, Contingencies and Guarantees (Credit Risk Of Financial Instruments By Contractual Amounts) (Details) - USD ($)
$ in Millions
Mar. 31, 2023
Dec. 31, 2022
Mar. 31, 2022
Dec. 31, 2021
Other Commitments [Line Items]        
Unused commitments to extend credit $ 65,097 $ 65,460    
Standby letters of credit 1,886 1,962    
Commercial letters of credit 54 75    
Liabilities associated with standby letters of credit 32 35    
Assets associated with standby letters of credit 33 37    
Reserve for unfunded credit commitments $ 124 $ 118 $ 76 $ 95