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INVENTORIES - Activity in reserves for excess and obsolete inventory (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Inventory Disclosure [Abstract]    
Balance at beginning of period $ (193) $ (191)
Provision for excess and obsolete inventory (20) (25)
Disposal of unsaleable inventory 55 29
Other 4 (6)
Balance at end of period $ (154) $ (193)