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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

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