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RESTRUCTURING - Roll forward of the restructuring liability (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Restructuring Reserve [Roll Forward] |  |  |  |
Restructuring reserve, beginning balance |  | $ 173 | $ 35 |
Delphi Technologies acquisition |  |  | 75 |
Restructuring expense, net | $ 50 | 163 | 203 | $ 72
Cash payments |  | (189) | (135) |
Foreign currency translation adjustment and other |  | (8) | (5) |
Restructuring reserve, ending balance | 35 | 139 | 173 | 35
Less: Non-current restructuring liability |  | 43 |  |
Current restructuring liability |  | 96 |  |
Employee termination benefits |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |
Restructuring reserve, beginning balance |  | 160 | 34 |
Delphi Technologies acquisition |  |  | 73 |
Restructuring expense, net |  | 99 | 157 |
Cash payments |  | (128) | (113) |
Foreign currency translation adjustment and other |  | (5) | 9 |
Restructuring reserve, ending balance | 34 | 126 | 160 | 34
Less: Non-current restructuring liability |  | 41 |  |
Current restructuring liability |  | 85 |  |
Other |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |
Restructuring reserve, beginning balance |  | 13 | 1 |
Delphi Technologies acquisition |  |  | 2 |
Restructuring expense, net |  | 64 | 46 |
Cash payments |  | (61) | (22) |
Foreign currency translation adjustment and other |  | (3) | (14) |
Restructuring reserve, ending balance | $ 1 | 13 | $ 13 | $ 1
Less: Non-current restructuring liability |  | 2 |  |
Current restructuring liability |  | $ 11 |  |

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