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Commitments, Contingencies and Guarantees (Tables)
12 Months Ended
Dec. 31, 2019
Commitments and Contingencies Disclosure [Abstract]  
Summary of Commitments
The following table summarizes the Company's commitments:
(Dollars in millions)
 
December 31, 2019
Commitments to extend credit
 
$
38,442

Issued standby and commercial letters of credit
 
4,191

Commitments to enter into forward-starting resale agreements
 
1,150

Other commitments
 
556