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Other Expense, Net - Schedule (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018 | Dec. 31, 2017
Other Income and Expenses [Abstract] |  |  |  |  |  |
Non-service related net periodic benefit cost | $ 30 | $ 27 |  |  | $ 88 | $ 83
Interest income | (5) | (6) |  |  | (21) | (16)
Foreign currency losses, net | 7 | 6 |  |  | 3 | 20
Net loss from asset sales | 2 | 2 |  |  | 6 | 7
Other, net | (3) | (21) |  |  | 16 | (25)
Total | $ 31 | $ 8 | $ 92 | $ 69 | $ 92 | $ 69

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