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FAIR VALUE MEASUREMENT - Items Measured at Fair Value on a Nonrecurring Basis (Details) - Nonrecurring - USD ($)
$ in Millions
Sep. 30, 2017
Dec. 31, 2016
Level 2    
Items Measured at Fair Value on a Nonrecurring Basis    
Loans held-for-sale $ 1,039 $ 3,389
Other real estate owned 9 15
Loans 267 586
Total assets 1,315 3,990
Level 3    
Items Measured at Fair Value on a Nonrecurring Basis    
Loans held-for-sale 2,172 2,413
Other real estate owned 43 60
Loans 451 790
Total assets 2,666 3,263
Fair value    
Items Measured at Fair Value on a Nonrecurring Basis    
Loans held-for-sale 3,211 5,802
Other real estate owned 52 75
Loans 718 1,376
Total assets $ 3,981 $ 7,253