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RESTRUCTURING CHARGES - Restructuring Roll Forward (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Restructuring Reserve [Roll Forward]    
Beginning balance $ 72 $ 114
Liability recognized   116
Payments (16) (141)
Other adjustments (8) (17)
Ending balance 48 72
Workforce reductions [Member]    
Restructuring Reserve [Roll Forward]    
Beginning balance 67 113
Liability recognized   57
Payments (13) (102)
Other adjustments (8) (1)
Ending balance 46 67
Plant closings and other [Member]    
Restructuring Reserve [Roll Forward]    
Beginning balance 5 1
Liability recognized   59
Payments (3) (39)
Other adjustments 0 (16)
Ending balance $ 2 $ 5