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Other (Income) Expense, Net (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Other Income and Expenses [Abstract] |  |  |  |
Interest income | $ (81) | $ (96) | $ (165) | $ (194)
Interest expense | 194 | 193 | 379 | 375
Exchange losses | 71 | 19 | 77 | 11
Equity (gains) losses from affiliates | (64) | (5) | (12) | 8
Net periodic defined benefit plan (credit) cost other than service cost | (130) | (131) | (265) | (260)
Other, net | (38) | (53) | (354) | (83)
Other (income) expense, net | $ (48) | $ (73) | $ (340) | $ (143)

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