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RESTRUCTURING - Reserve by Type of Cost (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring expense, net of cash paid | $ 62 | $ 37 | $ 92 | $ 52
Corporate |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring expense, net of cash paid | 3 | 0 | 3 | 0
Air Management | Operating Segments |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring expense, net of cash paid | 12 | 16 | 29 | 29
e-Propulsion & Drivetrain | Operating Segments |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring expense, net of cash paid | 23 | 21 | 33 | 23
Fuel Injection | Operating Segments |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring expense, net of cash paid | 24 | 0 | 27 | 0
Employee termination benefits |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring expense, net of cash paid | 36 | 28 | 57 | 40
Employee termination benefits | Corporate |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring expense, net of cash paid | 0 | 0 | 0 | 0
Employee termination benefits | Air Management | Operating Segments |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring expense, net of cash paid | 9 | 11 | 23 | 22
Employee termination benefits | e-Propulsion & Drivetrain | Operating Segments |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring expense, net of cash paid | 3 | 17 | 7 | 18
Employee termination benefits | Fuel Injection | Operating Segments |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring expense, net of cash paid | 24 | 0 | 27 | 0
Other |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring expense, net of cash paid | 26 | 9 | 35 | 12
Other | Corporate |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring expense, net of cash paid | 3 | 0 | 3 | 0
Other | Air Management | Operating Segments |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring expense, net of cash paid | 3 | 5 | 6 | 7
Other | e-Propulsion & Drivetrain | Operating Segments |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring expense, net of cash paid | 20 | 4 | 26 | 5
Other | Fuel Injection | Operating Segments |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring expense, net of cash paid | $ 0 | $ 0 | $ 0 | $ 0

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- Definition Amount, after cash payment, of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585 + Details
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