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Legal Proceedings, Contingencies and Commitments (Tables)
 12 Months Ended
Dec. 31, 2021
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,
 20212020
 (Dollars in millions)
Commitments to extend credit
Warehouse loan commitments$6,840 $2,849 
Mortgage loan commitments including interest rate locks5,539 10,702 
Other construction commitments2,719 1,934 
Commercial and industrial commitments1,582 1,271 
HELOC commitments631 544 
Other consumer commitments273 121 
Standby and commercial letters of credit107 95