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Commitments, Contingencies and Guarantees (Tables)
 6 Months Ended
Jun. 30, 2023
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:
June 30, 2023December 31, 2022
 (In millions)
Unused commitments to extend credit$64,784 $65,460 
Standby letters of credit1,882 1,962 
Commercial letters of credit19 75 
Liabilities associated with standby letters of credit23 35 
Assets associated with standby letters of credit26 37 
Reserve for unfunded credit commitments120118