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TRANSACTION AND REORGANIZATION EXPENSES (Details) - USD ($)
3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Reorganization and Related Expenses [Line Items]          
Transaction and integration expenses $ 21,000,000 $ 6,000,000 $ 27,000,000 $ 0 $ 0
Reorganization expenses     0 0 46,000,000
Corporate expenses          
Reorganization and Related Expenses [Line Items]          
Other assets write down     $ 0 $ 0 $ 5,000,000