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Commitments, Contingencies and Guarantees (Credit Risk Of Financial Instruments By Contractual Amounts) (Details) - USD ($)
$ in Millions
Jun. 30, 2024
Mar. 31, 2024
Dec. 31, 2023
Jun. 30, 2023
Mar. 31, 2023
Dec. 31, 2022
Commitments and Contingencies Disclosure [Abstract]            
Unused commitments to extend credit $ 63,746   $ 63,631      
Standby letters of credit 2,109   1,997      
Commercial letters of credit 61   78      
Liabilities associated with standby letters of credit 32   32      
Assets associated with standby letters of credit 34   34      
Reserve for unfunded credit commitments $ 111 $ 114 $ 124 $ 120 $ 124 $ 118