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Commitments, Contingencies and Guarantees (Tables)
6 Months Ended
Jun. 30, 2021
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, 2021December 31, 2020
 (In millions)
Unused commitments to extend credit$60,626 $56,644 
Standby letters of credit1,773 1,742 
Commercial letters of credit42 132 
Liabilities associated with standby letters of credit31 25 
Assets associated with standby letters of credit31 25 
Reserve for unfunded credit commitments87 126