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FAIR VALUE MEASUREMENTS - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Other income $ 18 $ 19 $ 52 $ 50  
Commercial real estate loans held for sale          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Loans in this portfolio that were 90 days or more past due or nonaccruing 0   0   $ 0
Other income   1 1 4  
Mortgage banking fees | Residential loans held for sale          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Changes in fair value $ (8) $ (1) $ (7) $ 9