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Commitments, Contingencies and Guarantees (Tables)
 9 Months Ended
Sep. 30, 2024
Commitments and Contingencies Disclosure [Abstract]  
Credit Risk Of Off- Balance Sheet Financial Instruments By Contractual Amounts
Credit risk associated with these instruments is represented by the contractual amounts indicated in the following table:
September 30, 2024December 31, 2023
 (In millions)
Unused commitments to extend credit$64,642 $63,631 
Standby letters of credit2,094 1,997 
Commercial letters of credit62 78 
Liabilities associated with standby letters of credit33 32 
Assets associated with standby letters of credit34 34 
Reserve for unfunded credit commitments121124