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Legal Proceedings, Contingencies and Commitments (Tables)
 12 Months Ended
Dec. 31, 2020
Commitments and Contingencies Disclosure [Abstract]  
Summary of the Contractual Amount of Significant Commitments The following table is a summary of the contractual amount of significant commitments:
 December 31,
 20202019
 (Dollars in millions)
Commitments to extend credit
Mortgage loan commitments including interest rate locks$10,702 $4,099 
Warehouse loan commitments2,849 1,944 
Commercial and industrial commitments1,271 1,107 
Other construction commitments1,934 2,015 
HELOC commitments544 558 
Other consumer commitments121 175 
Standby and commercial letters of credit95 82