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RESTRUCTURING RESERVES - Schedule of Cumulative Amounts Incurred to Date and Expected (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2018
USD ($)
Restructuring Cost and Reserve [Line Items]  
Cumulative amount incurred to date $ 248
Additional amount expected 3
Segments | United States  
Restructuring Cost and Reserve [Line Items]  
Cumulative amount incurred to date 70
Additional amount expected 3
Segments | Canada  
Restructuring Cost and Reserve [Line Items]  
Cumulative amount incurred to date 93
Additional amount expected 0
Segments | Other businesses  
Restructuring Cost and Reserve [Line Items]  
Cumulative amount incurred to date 67
Additional amount expected 0
Unallocated expense  
Restructuring Cost and Reserve [Line Items]  
Cumulative amount incurred to date 18
Additional amount expected $ 0