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Commitments, Contingencies and Guarantees (Credit Risk Of Financial Instruments By Contractual Amounts) (Details) - USD ($)
$ in Millions
Sep. 30, 2023
Jun. 30, 2023
Dec. 31, 2022
Sep. 30, 2022
Jun. 30, 2022
Dec. 31, 2021
Other Commitments [Line Items]            
Unused commitments to extend credit $ 64,610   $ 65,460      
Standby letters of credit 1,934   1,962      
Commercial letters of credit 75   75      
Liabilities associated with standby letters of credit 27   35      
Assets associated with standby letters of credit 29   37      
Reserve for unfunded credit commitments $ 130 $ 120 $ 118 $ 121 $ 89 $ 95