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RESTRUCTURING - Roll Forward of Restructuring Liability (Details) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2021 USD ($)
Restructuring Reserve [Roll Forward] |  |  |  |  |
Restructuring reserve, beginning balance |  |  | $ 173 | $ 34 | $ 62
Restructuring expense, net | $ 51 | $ 20 | 143 | 72 |
Cash payments |  |  | (159) | (46) |
Foreign currency translation adjustment |  |  | 2 | 2 |
Restructuring reserve, ending balance | 159 | 62 | 159 | 62 | 159
Less: Non-current restructuring liability | 49 | 19 | 49 | 19 | 49
Current restructuring liability | 110 | 43 | 110 | 43 | 110
Employee Termination Benefits |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |
Restructuring reserve, beginning balance |  |  | 160 | 34 | 44
Restructuring expense, net |  |  | 95 | 50 |
Cash payments |  |  | (107) | (40) |
Foreign currency translation adjustment |  |  | 2 | 0 |
Restructuring reserve, ending balance | 150 | 44 | 150 | 44 | 150
Less: Non-current restructuring liability | 47 | 16 | 47 | 16 | 47
Current restructuring liability | 103 | 28 | 103 | 28 | 103
Other |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |
Restructuring reserve, beginning balance |  |  | 13 | 0 | 18
Restructuring expense, net |  |  | 48 | 22 |
Cash payments |  |  | (52) | (6) |
Foreign currency translation adjustment |  |  | 0 | 2 |
Restructuring reserve, ending balance | 9 | 18 | 9 | 18 | 9
Less: Non-current restructuring liability | 2 | 3 | 2 | 3 | 2
Current restructuring liability | $ 7 | $ 15 | $ 7 | $ 15 | $ 7

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- Definition Amount 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://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=109237686&loc=d3e17752-110868 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 5.P.3) -URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140864-122747 Reference 3: 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 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.P.4(b)(1)) -URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747 + Details
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- Definition Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4(b)(2)) -URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747 + Details
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