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RESTRUCTURING, INTEGRATION AND SEPARATION COSTS - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Cost-rationalization and integration initiatives |  |  |
Restructuring, integration and separation costs | $ 22 | $ 31 | $ 22
Selling, general and administrative | 2,367 | 2,554 | 2,473
Restructuring and Integration-Related Costs |  |  |
Cost-rationalization and integration initiatives |  |  |
Remaining restructuring liabilities | 20 |  |
Restructuring costs | 11 | 31 | 22
Facility closure costs | 10 | 11 | 10
Severance costs | 1 | 11 | 11
Restructuring payments | 18 | 31 | 33
Other costs |  | $ 9 | $ 1
Separation Costs |  |  |
Cost-rationalization and integration initiatives |  |  |
Restructuring, integration and separation costs | 11 |  |
Selling, general and administrative | $ 21 |  |

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