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SUPPLEMENTAL FINANCIAL INFORMATION - Other Expense, Net (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Other Income, net |  |  |  |
Foreign exchange (gains) losses, net | $ 8 | $ 10 | $ 5 | $ 21
Pension and other postretirement benefit plans | 3 | (1) | 7 | (2)
Change in fair value of marketable equity securities | (9) | 0 | (7) | 0
Other, net | (4) | (3) | (2) | (3)
Other (income) expense, net | $ (2) | $ 6 | $ 3 | $ 16

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