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REPOSITIONING AND OTHER CHARGES 4 (Details) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 USD ($) Employees | Sep. 30, 2020 USD ($) Employees | Sep. 30, 2021 USD ($) Employees | Sep. 30, 2020 USD ($) Employees
Net Repositioning And Other Charges [Line Items] |  |  |  |
Restructuring and Related Cost, Incurred Cost | $ 72 | $ 124 | $ 262 | $ 449
Net repositioning and other charges Paragraph Details [Abstract] |  |  |  |
Gross Repositioning Charge | $ 69 | $ 135 | $ 280 | $ 491
Number of employees severed | Employees | 603 | 3,113 | 5,252 | 13,042
Severance |  |  |  |
Net Repositioning And Other Charges [Line Items] |  |  |  |
Restructuring and Related Cost, Incurred Cost | $ 3 | $ 113 | $ 63 | $ 433
Asset impairments |  |  |  |
Net Repositioning And Other Charges [Line Items] |  |  |  |
Restructuring and Related Cost, Incurred Cost | 20 | 5 | 107 | 11
Exit costs |  |  |  |
Net Repositioning And Other Charges [Line Items] |  |  |  |
Restructuring and Related Cost, Cost Incurred to Date | 30 | 32 | 30 | 32
Restructuring and Related Cost, Incurred Cost | 46 | 17 | 110 | 47
Reserve adjustments |  |  |  |
Net Repositioning And Other Charges [Line Items] |  |  |  |
Restructuring and Related Cost, Incurred Cost | $ 3 | $ (11) | $ (18) | $ (42)

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