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RESTRUCTURING - Reserve by Type of Cost (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring expense, net of cash paid | $ 51 | $ 20 | $ 143 | $ 72
Corporate |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring expense, net of cash paid | 0 | 2 | 3 | 2
Air Management | Operating Segments |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring expense, net of cash paid | 11 | 14 | 40 | 43
e-Propulsion & Drivetrain | Operating Segments |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring expense, net of cash paid | 11 | 4 | 44 | 27
Fuel Injection | Operating Segments |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring expense, net of cash paid | 29 | 0 | 56 | 0
Employee termination benefits |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring expense, net of cash paid | 38 | 10 | 95 | 50
Employee termination benefits | Corporate |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring expense, net of cash paid | 0 | 1 | 0 | 1
Employee termination benefits | Air Management | Operating Segments |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring expense, net of cash paid | 7 | 9 | 30 | 31
Employee termination benefits | e-Propulsion & Drivetrain | Operating Segments |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring expense, net of cash paid | 2 | 0 | 9 | 18
Employee termination benefits | Fuel Injection | Operating Segments |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring expense, net of cash paid | 29 | 0 | 56 | 0
Other |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring expense, net of cash paid | 13 | 10 | 48 | 22
Other | Corporate |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring expense, net of cash paid | 0 | 1 | 3 | 1
Other | Air Management | Operating Segments |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring expense, net of cash paid | 4 | 5 | 10 | 12
Other | e-Propulsion & Drivetrain | Operating Segments |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring expense, net of cash paid | 9 | 4 | 35 | 9
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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