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Legal Proceedings, Contingencies and Commitments (Tables)
 6 Months Ended
Jun. 30, 2021
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, 2021December 31, 2020
 (Dollars in millions)
Commitments to extend credit
Mortgage loan commitments including interest rate locks$9,175 $10,702 
Warehouse loan commitments4,869 2,849 
Commercial and industrial commitments1,537 1,271 
Other construction commitments2,176 1,934 
HELOC commitments596 544 
Other consumer commitments166 121 
Standby and commercial letters of credit102 95