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ASSETS IMPAIRMENTS AND RESTRUCTURING (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Restructuring Cost and Reserve [Line Items]          
Total $ 4 $ 0 $ 6 $ 0  
Restructuring Charge [Roll Forward]          
Balance at Beginning of Period     29 55 $ 55
Provision / Adjustments     6   8
Restructuring Reserve, Accrual Adjustment     0    
Non-cash Reductions         0
Cash Reductions     (10)   (34)
Balance at End of Period 25   25   29
Facility Closing [Member]          
Restructuring Charge [Roll Forward]          
Balance at Beginning of Period     10 13 13
Provision / Adjustments     0   1
Restructuring Reserve, Accrual Adjustment     0   1
Cash Reductions     (1)   (5)
Balance at End of Period 9   9   10
Employee Severance [Member]          
Restructuring Charge [Roll Forward]          
Balance at Beginning of Period     19 42 42
Provision / Adjustments     6   6
Restructuring Reserve, Accrual Adjustment     0   0
Cash Reductions     (9)   (29)
Balance at End of Period $ 16   16   19
Non-Cash Charges [Member]          
Restructuring Charge [Roll Forward]          
Balance at Beginning of Period     $ 0 $ 0 0
Provision / Adjustments         1
Non-cash Reductions         (1)
Cash Reductions         0
Balance at End of Period         $ 0