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Legal Proceedings, Contingencies and Commitments (Tables)
 6 Months Ended
Jun. 30, 2022
Commitments and Contingencies Disclosure [Abstract]  
Summary of Contractual Amount of Significant Commitments The following table is a summary of the contractual amount of significant commitments:
June 30, 2022December 31, 2021
 (Dollars in millions)
Commitments to extend credit
Mortgage loan commitments including interest rate locks$5,576 $5,539 
Warehouse loan commitments7,649 6,840 
Commercial and industrial commitments1,817 1,582 
Other construction commitments3,215 2,719 
HELOC commitments881 631 
Other consumer commitments692 273 
Standby and commercial letters of credit107 107