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Loans - Wholesale Loan Portfolio - Impaired Loans (Details) - Wholesale - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Impaired loans      
With an allowance $ 1,444   $ 1,070
Without an allowance 194   180
Total impaired loans 1,638   1,250
Allowance for loan losses related to impaired loans 417   297
Unpaid principal balance of impaired loans 2,059   1,723
Average impaired credit card loans 1,567 $ 1,809  
Troubled debt restructuring 592   576
Commercial and industrial      
Impaired loans      
With an allowance 992   807
Without an allowance 168   140
Total impaired loans 1,160   947
Allowance for loan losses related to impaired loans 321   252
Unpaid principal balance of impaired loans 1,322   1,043
Average impaired credit card loans 1,220 1,343  
Real estate      
Impaired loans      
With an allowance 90   107
Without an allowance 24   27
Total impaired loans 114   134
Allowance for loan losses related to impaired loans 22   25
Unpaid principal balance of impaired loans 188   203
Average impaired credit card loans 131 144  
Financial institutions      
Impaired loans      
With an allowance 19   4
Without an allowance 0   0
Total impaired loans 19   4
Allowance for loan losses related to impaired loans 6   1
Unpaid principal balance of impaired loans 20   4
Average impaired credit card loans 12 92  
Governments & Agencies      
Impaired loans      
With an allowance 0   0
Without an allowance 0   0
Total impaired loans 0   0
Allowance for loan losses related to impaired loans 0   0
Unpaid principal balance of impaired loans 0   0
Average impaired credit card loans 0 0  
Other      
Impaired loans      
With an allowance 343   152
Without an allowance 2   13
Total impaired loans 345   165
Allowance for loan losses related to impaired loans 68   19
Unpaid principal balance of impaired loans 529   $ 473
Average impaired credit card loans $ 204 $ 230