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SUPPLEMENTAL FINANCIAL INFORMATION - Other Expense, Net (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Other Income, net |  |  |  |
Foreign exchange (gains) losses, net | $ 0 | $ 23 | $ 5 | $ 44
Pension and other postretirement benefit plans | 4 | 0 | 11 | (2)
Change in fair value of marketable equity securities | 9 | (9) | 2 | (9)
Other, net | (1) | 2 | (3) | (1)
Other expense, net | $ 12 | $ 16 | $ 15 | $ 32

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