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Commitments, Contingencies and Guarantees (Credit Risk Of Financial Instruments By Contractual Amounts) (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Other Commitments [Line Items]        
Unused commitments to extend credit $ 65,460 $ 60,935    
Standby letters of credit 1,962 1,779    
Commercial letters of credit 75 97    
Liabilities associated with standby letters of credit 35 28    
Assets associated with standby letters of credit 37 29    
Reserve for unfunded credit commitments $ 118 $ 95 $ 126 $ 45