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Accounting for Transfers and Servicing of Financial Assets and Variable Interest Entities (Tables)
6 Months Ended
Jun. 30, 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:
 
                 
(Dollars in Millions)  
June 30,
2019
   
December 31,
2018
 
Investment carrying amount
  $ 5,839     $ 5,823  
Unfunded capital and other commitments
    2,674       2,778  
Maximum exposure to loss
    12,540       12,360