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RESTRUCTURING AND OTHER COSTS - RESTRUCTURING ACCRUALS (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Restructuring Reserve |  |
Beginning balance | $ 30 | $ 46
Provisions and adjustments | 36 | 42
Amounts applied | (23) | (49)
Change in estimates | (9) | (9)
Ending balance | 34 | 30
Severance |  |
Restructuring Reserve |  |
Beginning balance | 27 | 43
Provisions and adjustments | 32 | 36
Amounts applied | (21) | (43)
Change in estimates | (9) | (9)
Ending balance | 29 | 27
Severance | 2018 and Prior Plans |  |
Restructuring Reserve |  |
Beginning balance | 7 |
Provisions and adjustments | 2 |
Amounts applied | (4) |
Change in estimates | 0 |
Ending balance | 5 | 7
Severance | 2019 Plans |  |
Restructuring Reserve |  |
Beginning balance | 20 | 0
Provisions and adjustments | 2 | 31
Amounts applied | (8) | (9)
Change in estimates | (7) | (2)
Ending balance | 7 | 20
Severance | 2020 Plans |  |
Restructuring Reserve |  |
Beginning balance | 0 |
Provisions and adjustments | 28 |
Amounts applied | (9) |
Change in estimates | (2) |
Ending balance | 17 | 0
Severance | 2017 and Prior Plans |  |
Restructuring Reserve |  |
Beginning balance | 2 | 27
Provisions and adjustments |  | 4
Amounts applied |  | (22)
Change in estimates |  | (7)
Ending balance |  | 2
Severance | 2018 Plans |  |
Restructuring Reserve |  |
Beginning balance | 5 | 16
Provisions and adjustments |  | 1
Amounts applied |  | (12)
Change in estimates |  | 0
Ending balance |  | 5
Other Restructuring Costs |  |
Restructuring Reserve |  |
Beginning balance | 3 | 3
Provisions and adjustments | 4 | 6
Amounts applied | (2) | (6)
Ending balance | 5 | 3
Other Restructuring Costs | 2018 and Prior Plans |  |
Restructuring Reserve |  |
Beginning balance | 3 |
Provisions and adjustments | 0 |
Amounts applied | 0 |
Ending balance | 3 | 3
Other Restructuring Costs | 2019 Plans |  |
Restructuring Reserve |  |
Beginning balance | 0 | 0
Provisions and adjustments | 1 | 3
Amounts applied | (1) | (3)
Ending balance | 0 | 0
Other Restructuring Costs | 2020 Plans |  |
Restructuring Reserve |  |
Beginning balance | 0 |
Provisions and adjustments | 3 |
Amounts applied | (1) |
Ending balance | 2 | 0
Other Restructuring Costs | 2017 and Prior Plans |  |
Restructuring Reserve |  |
Beginning balance | 3 | 3
Provisions and adjustments |  | 2
Amounts applied |  | (2)
Ending balance |  | 3
Other Restructuring Costs | 2018 Plans |  |
Restructuring Reserve |  |
Beginning balance | $ 0 | 0
Provisions and adjustments |  | 1
Amounts applied |  | (1)
Ending balance |  | $ 0

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- Definition Amount of cash payments made as the result of exit or disposal activities. Excludes payments associated with a discontinued operation or an asset retirement obligation. + 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/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 17 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3367-108585 + 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://fasb.org/us-gaap/role/ref/legacyRef -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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747 + Details
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