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STOCKHOLDERS' EQUITY Part 2 AOCI (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Cumulative Translation Adjustment | $ (280) |  | $ (280) |  | $ (293) | $ (264)
Change in cumulative translation adjustment | 2 | $ (20) | 13 | $ (15) | (29) |
Benefit Plans Unrecognized Prior Service Credits | 66 |  | 66 |  | 87 | 106
Change in Benefit Plans Unrecognized Prior Service Credits |  |  | (21) |  | (19) |
Unrealized Gains (Losses) on Derivative Instruments | 30 |  | 30 |  | (66) | (55)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax |  |  | 96 |  | (11) |
Unrealized Losses on Investments | (1) |  | (1) |  | (1) | (1)
Change in Unrealized Losses on Investments |  |  | 0 |  | 0 |
Accumulated Other Comprehensive Income (Loss), Net of Tax | (185) |  | (185) |  | (273) | $ (214)
Total other comprehensive income (loss), net of tax | $ 48 | $ (34) | $ 88 | $ (29) | $ (59) |

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- Definition Amount, after tax, of accumulated unrealized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=124509347&loc=d3e681-108580 + Details
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