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RESTRUCTURING COSTS - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Dec. 31, 2019
Restructuring Cost and Reserve [Line Items] |  |  |
Net pre-tax restructuring costs | $ 5 | $ 33 |
2020 Actions |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Net pre-tax restructuring costs | 2 |  |
Restructuring reserve | 2 |  | $ 0
2019 Actions |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Net pre-tax restructuring costs | 3 | 25 |
Restructuring reserve | 32 |  | $ 44
2018 and Prior Actions |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Net pre-tax restructuring costs | 0 | 8 |
Restructuring reserve | 13 | 47 |
Cost of sales |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Net pre-tax restructuring costs | 1 | 5 |
Cost of sales | 2020 Actions |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Net pre-tax restructuring costs | 1 |  |
Cost of sales | 2019 Actions |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Net pre-tax restructuring costs | 0 | 2 |
Selling, general and administrative |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Net pre-tax restructuring costs | 4 | 28 |
Selling, general and administrative | 2020 Actions |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Net pre-tax restructuring costs | 1 |  |
Selling, general and administrative | 2019 Actions |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Net pre-tax restructuring costs | $ 3 | $ 23 |

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