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Accounting for Transfers and Servicing of Financial Assets and Variable Interest Entities (Tables)
 12 Months Ended
Dec. 31, 2019
Accounting Policies [Abstract]  
Summary of Investments in Community Development and Tax-advantaged VIEs
The following table provides a summary of investments in community development and
tax-advantaged
VIEs that the Company has not consolidated:
                 
At December 31 (Dollars in Millions)   2019        2018  
Investment carrying amount
   $ 6,148        $ 5,823  
Unfunded capital and other commitments
     2,938          2,778  
Maximum exposure to loss
     12,118          12,360