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LOANS - Non-accrual Corporate Loans (Details) - Corporate - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Financing receivable impaired      
Number of months in sustained period of repayment performance for cash-basis loans to return to an accrual status 6 months    
Recorded investment $ 1,942 $ 2,421  
Unpaid principal balance 2,459 2,954  
Related specific allowance 426 392  
Average carrying value 2,109 2,407  
Interest income recognized 35 40 $ 11
Recorded investment, impaired financing receivable with specific allowance 1,215 1,485  
Recorded investment, impaired financing receivable without specific allowance 727 936  
Commercial and industrial      
Financing receivable impaired      
Recorded investment 1,506 1,909  
Unpaid principal balance 1,775 2,259  
Related specific allowance 368 362  
Average carrying value 1,547 1,919  
Interest income recognized 23 25  
Recorded investment, impaired financing receivable with specific allowance 1,017 1,343  
Recorded investment, impaired financing receivable without specific allowance 489 566  
Financial institutions      
Financing receivable impaired      
Recorded investment 92 185  
Unpaid principal balance 102 192  
Related specific allowance 41 16  
Average carrying value 212 183  
Interest income recognized 1 3  
Recorded investment, impaired financing receivable with specific allowance 88 45  
Recorded investment, impaired financing receivable without specific allowance 4 140  
Mortgage and real estate      
Financing receivable impaired      
Recorded investment 195 139  
Unpaid principal balance 324 250  
Related specific allowance 11 10  
Average carrying value 183 174  
Interest income recognized 10 6  
Recorded investment, impaired financing receivable with specific allowance 51 41  
Recorded investment, impaired financing receivable without specific allowance 144 98  
Lease financing      
Financing receivable impaired      
Recorded investment 46 56  
Unpaid principal balance 46 56  
Related specific allowance 4 4  
Average carrying value 59 44  
Interest income recognized 0 0  
Recorded investment, impaired financing receivable with specific allowance 46 55  
Recorded investment, impaired financing receivable without specific allowance 0 1  
Other      
Financing receivable impaired      
Recorded investment 103 132  
Unpaid principal balance 212 197  
Related specific allowance 2 0  
Average carrying value 108 87  
Interest income recognized 1 6  
Recorded investment, impaired financing receivable with specific allowance 13 1  
Recorded investment, impaired financing receivable without specific allowance $ 90 $ 131