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INCOME TAXES - Deferred taxes (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Deferred tax assets and liabilities      
Deferred tax assets $ 272 $ 343  
Deferred tax liabilities (376) (331)  
Net deferred tax assets   $ 12  
Net deferred tax liabilities $ (104)   $ (254)