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LOANS - Impaired Consumer Loans (Details) - Consumer
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2017
USD ($)
Q
Mar. 31, 2016
USD ($)
Dec. 31, 2016
USD ($)
Q
Financing receivable impaired      
Recorded investment $ 7,573   $ 7,799
Unpaid principal balance 8,694   8,987
Related specific allowance 1,569   1,608
Average carrying value 8,216   $ 8,802
Interest income recognized $ 96 $ 120  
Number of quarters used to calculate the average recorded investment balance | Q 4   4
Residential first mortgages      
Financing receivable impaired      
Recorded investment $ 3,632   $ 3,786
Unpaid principal balance 3,995   4,157
Related specific allowance 402   540
Average carrying value 4,116   4,632
Interest income recognized 36 61  
Impaired financing receivable without specific allowance 680   740
Home equity loans      
Financing receivable impaired      
Recorded investment 1,219   1,298
Unpaid principal balance 1,720   1,824
Related specific allowance 281   189
Average carrying value 1,289   1,326
Interest income recognized 8 9  
Impaired financing receivable without specific allowance 388   406
Credit cards      
Financing receivable impaired      
Recorded investment 1,824   1,747
Unpaid principal balance 1,858   1,781
Related specific allowance 588   566
Average carrying value 1,813   1,831
Interest income recognized 38 41  
Individual installment and other      
Financing receivable impaired      
Recorded investment 391   455
Unpaid principal balance 411   481
Related specific allowance 176   215
Average carrying value 449   475
Interest income recognized 8 7  
Commercial banking loans      
Financing receivable impaired      
Recorded investment 507   513
Unpaid principal balance 710   744
Related specific allowance 122   98
Average carrying value 549   538
Interest income recognized 6 $ 2  
Impaired financing receivable without specific allowance $ 82   $ 97