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RESTRUCTURING RESERVES - Schedule of Restructuring Costs (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Restructuring Cost and Reserve [Line Items]      
COGS $ 0 $ 13 $ 5
Involuntary employee termination costs 40 59 34
Other charges (gains) 7 44 1
Total 47 116 40
Segments | United States      
Restructuring Cost and Reserve [Line Items]      
COGS (1) 1 3
Involuntary employee termination costs 15 32 21
Other charges (gains) (6) (22) (9)
Total 8 11 15
Segments | Canada      
Restructuring Cost and Reserve [Line Items]      
COGS 0 8 2
Involuntary employee termination costs 24 15 13
Other charges (gains) 11 16 1
Total 35 39 16
Segments | Other businesses      
Restructuring Cost and Reserve [Line Items]      
COGS 1 4  
Involuntary employee termination costs 1 12  
Other charges (gains) 4 39  
Total 6 55  
Unallocated expense      
Restructuring Cost and Reserve [Line Items]      
COGS 0 0 0
Involuntary employee termination costs 0 0 0
Other charges (gains) (2) 11 9
Total $ (2) $ 11 $ 9