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Commitments, Contingencies and Guarantees (Credit Risk Of Off-Balance Sheet Financial Instruments By Contractual Amounts) (Details) - USD ($)
$ in Millions
Sep. 30, 2022
Jun. 30, 2022
Dec. 31, 2021
Sep. 30, 2021
Jun. 30, 2021
Dec. 31, 2020
Other Commitments [Line Items]            
Unused commitments to extend credit $ 66,907   $ 60,935      
Standby Letters Of Credit Commitment 1,979   1,779      
Commercial letters of credit 48   97      
Liabilities associated with standby letters of credit 33   28      
Assets associated with standby letters of credit 33   29      
Reserve for unfunded credit commitments $ 121 $ 89 $ 95 $ 71 $ 87 $ 126