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FAIR VALUE MEASUREMENTS - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Other income $ 6 $ 22 $ 31 $ 43  
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 2 3 2  
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 $ 3 $ 6 $ 10 $ 12