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Commitments, Contingencies and Guarantees (Credit Risk Of Financial Instruments By Contractual Amounts) (Details) - USD ($)
$ in Millions
Jun. 30, 2023
Mar. 31, 2023
Dec. 31, 2022
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2021
Other Commitments [Line Items]            
Unused commitments to extend credit $ 64,784   $ 65,460      
Standby letters of credit 1,882   1,962      
Commercial letters of credit 19   75      
Liabilities associated with standby letters of credit 23   35      
Assets associated with standby letters of credit 26   37      
Reserve for unfunded credit commitments $ 120 $ 124 $ 118 $ 89 $ 76 $ 95