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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] |  |  |
Cumulative foreign exchange translation adjustment | $ (2,780,000,000) | $ (2,566,000,000) |
Pension and other postretirement benefit adjustments | (601,000,000) | (675,000,000) |
Changes in fair value of available for sale investments | 4,000,000 | 0 |
Changes in fair value of designated cash flow hedges | 0 | 44,000,000 |
Accumulated Other Comprehensive Income (Loss) | (3,377,000,000) | (3,197,000,000) | $ (3,437,000,000)
Other Comprehensive Income (Loss), Net of Tax [Abstract] |  |  |
Foreign exchange translation adjustment | (211,000,000) | 143,000,000 | (685,000,000)
Pensions and other postretirement benefit adjustments | 74,000,000 | 86,000,000 | (606,000,000)
Changes in fair value of available for sale investments | 4,000,000 | 0 | 0
Changes in fair value of designated cash flow hedges | (44,000,000) | 11,000,000 | 85,000,000
Components of other comprehensive income (loss), net of tax | (180,000,000) | 240,000,000 |
Accumulated Other Comprehensive Income (Loss) [Member] |  |  |
Other Comprehensive Income (Loss), before Tax [Abstract] |  |  |
Foreign exchange translation adjustment | (214,000,000) | 143,000,000 |
Pension and other postretirement benefit adjustments | 76,000,000 | 115,000,000 |
Changes in fair value of available for sale investments | 4,000,000 |  |
Changes in fair value of designated cash flow hedges | (61,000,000) | 20,000,000 |
Changes in accumulated other comprehensive income, pretax | (195,000,000) | 278,000,000 |
Other Comprehensive Income (Loss), Tax [Abstract] |  |  |
Foreign exchange translation adjustment | 0 | 0 |
Pensions and other postretirement benefit adjustments | (2,000,000) | (29,000,000) |
Changes in fair value of available for sale investments | 0 |  |
Changes in fair value of designated cash flow hedges | 17,000,000 | (9,000,000) |
Other comprehensive income (loss), tax | 15,000,000 | (38,000,000) |
Other Comprehensive Income (Loss), Net of Tax [Abstract] |  |  |
Foreign exchange translation adjustment | (214,000,000) | 143,000,000 | (728,000,000)
Pensions and other postretirement benefit adjustments | 74,000,000 | 86,000,000 | (559,000,000)
Changes in fair value of available for sale investments | 4,000,000 |  |
Changes in fair value of designated cash flow hedges | (44,000,000) | 11,000,000 | 85,000,000
Components of other comprehensive income (loss), net of tax | $ (180,000,000) | $ 240,000,000 |
AOCI Including Spin Transactions [Member] | Accumulated Other Comprehensive Income (Loss) [Member] |  |  |
Other Comprehensive Income (Loss), before Tax [Abstract] |  |  |
Foreign exchange translation adjustment |  |  | (728,000,000)
Pension and other postretirement benefit adjustments |  |  | (727,000,000)
Changes in fair value of designated cash flow hedges |  |  | 102,000,000
Changes in accumulated other comprehensive income, pretax |  |  | (1,353,000,000)
Other Comprehensive Income (Loss), Tax [Abstract] |  |  |
Foreign exchange translation adjustment |  |  | 0
Pensions and other postretirement benefit adjustments |  |  | 168,000,000
Changes in fair value of designated cash flow hedges |  |  | (17,000,000)
Other comprehensive income (loss), tax |  |  | 151,000,000
Other Comprehensive Income (Loss), Net of Tax [Abstract] |  |  |
Foreign exchange translation adjustment |  |  | (728,000,000)
Pensions and other postretirement benefit adjustments |  |  | (559,000,000)
Changes in fair value of designated cash flow hedges |  |  | 85,000,000
Components of other comprehensive income (loss), net of tax |  |  | $ (1,202,000,000)

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- Definition Accumulated adjustment, net of tax, that results from the process of translating subsidiary financial statements and foreign equity investments into the reporting currency from the functional currency of the reporting entity, net of reclassification of realized foreign currency translation gains or losses. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=118930883&loc=d3e637-108580 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=118261656&loc=d3e32022-110900 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=118930883&loc=d3e681-108580 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 45 -Paragraph 5A -URI http://asc.fasb.org/extlink&oid=116690757&loc=SL116692626-108610 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450520&loc=d3e32583-110901 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669646-108580 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669686-108580 + Details
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