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Other (Income) Expense, Net (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Other Income and Expenses [Abstract] |  |  |  |
Interest income | $ (92) | $ (90) | $ (257) | $ (284)
Interest expense | 190 | 189 | 569 | 564
Exchange losses (gains) | 42 | (6) | 119 | 5
Equity income from affiliates | (81) | (18) | (93) | (11)
Net periodic defined benefit plan (credit) cost other than service cost | (119) | (121) | (384) | (381)
Other, net | (112) | (161) | (466) | (244)
Other (income) expense, net | $ (172) | $ (207) | $ (512) | $ (351)

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