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RESTRUCTURING ACTIVITIES (Activities of Restructuring Liabilities) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Restructuring Reserve [Roll Forward]    
Beginning balance $ 22 $ 9
Income statement expense 49 30
Cash payments (33) (17)
Ending balance 38 22
Employee Separation Costs [Member]    
Restructuring Reserve [Roll Forward]    
Beginning balance 21 6
Income statement expense 45 29
Cash payments (29) (14)
Ending balance 37 21
Facility-Related Costs [Member]    
Restructuring Reserve [Roll Forward]    
Beginning balance 1 3
Income statement expense 4 1
Cash payments (4) (3)
Ending balance $ 1 $ 1