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Commitments, Contingencies and Guarantees (Credit Risk Of Financial Instruments By Contractual Amounts) (Details) - USD ($)
$ in Millions
Sep. 30, 2024
Jun. 30, 2024
Dec. 31, 2023
Sep. 30, 2023
Jun. 30, 2023
Dec. 31, 2022
Commitments and Contingencies Disclosure [Abstract]            
Unused commitments to extend credit $ 64,642   $ 63,631      
Standby letters of credit 2,094   1,997      
Commercial letters of credit 62   78      
Liabilities associated with standby letters of credit 33   32      
Assets associated with standby letters of credit 34   34      
Reserve for unfunded credit commitments $ 121 $ 111 $ 124 $ 130 $ 120 $ 118