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RESTRUCTURING ACTIVITIES (Pre-Tax Restructuring charges) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Restructuring Cost and Reserve [Line Items] |  |  |
Total restructuring charges | $ (3) | $ 49 |
Invigorate Program |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Employee separation costs | (3) | 45 | $ 29
Facility-related costs | 1 | 4 | 1
Asset impairment charges | 0 | 2 | 3
Total restructuring charges | $ (2) | $ 51 | $ 33

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