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LOANS - Impaired Consumer Loans (Details) - Consumer
$ in Millions
12 Months Ended
Dec. 31, 2016
USD ($)
Q
Dec. 31, 2015
USD ($)
Q
Dec. 31, 2014
USD ($)
Financing receivable impaired      
Recorded investment $ 7,799 $ 10,192  
Unpaid principal balance 8,987 11,659  
Related specific allowance 1,608 2,046  
Average carrying value 8,802 13,599  
Interest income recognized $ 402 $ 728 $ 1,106
Number of quarters used to calculate the average recorded investment balance | Q 4 4  
Residential first mortgages      
Financing receivable impaired      
Recorded investment $ 3,786 $ 6,038  
Unpaid principal balance 4,157 6,610  
Related specific allowance 540 739  
Average carrying value 4,632 8,932  
Interest income recognized 170 439  
Impaired financing receivable without specific allowance 740 1,151  
Home equity loans      
Financing receivable impaired      
Recorded investment 1,298 1,399  
Unpaid principal balance 1,824 1,972  
Related specific allowance 189 406  
Average carrying value 1,326 1,778  
Interest income recognized 35 64  
Impaired financing receivable without specific allowance 406 459  
Credit cards      
Financing receivable impaired      
Recorded investment 1,747 1,950  
Unpaid principal balance 1,781 1,986  
Related specific allowance 566 604  
Average carrying value 1,831 2,079  
Interest income recognized 158 179  
Individual installment and other      
Financing receivable impaired      
Recorded investment 455 464  
Unpaid principal balance 481 519  
Related specific allowance 215 197  
Average carrying value 475 449  
Interest income recognized 27 33  
Commercial market loans      
Financing receivable impaired      
Recorded investment 513 341  
Unpaid principal balance 744 572  
Related specific allowance 98 100  
Average carrying value 538 361  
Interest income recognized 12 13  
Impaired financing receivable without specific allowance $ 97 $ 86