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Other Expense, Net - Schedule (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018 | Dec. 31, 2017
Other Income and Expenses [Abstract] |  |  |  |  |  |
Non-service related net periodic benefit cost | $ 29 | $ 28 |  |  | $ 58 | $ 56
Interest income | (6) | (4) |  |  | (16) | (10)
Foreign currency (gains) losses, net | (4) | 17 |  |  | (4) | 14
Net loss from asset sales | 2 | 2 |  |  | 4 | 5
Other, net | 8 | (2) |  |  | 19 | (4)
Total | $ 29 | $ 41 | $ 61 | $ 61 | $ 61 | $ 61

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- Definition Amount before tax of foreign currency transaction realized and unrealized gain (loss) recognized in the income statement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450222&loc=d3e30840-110895 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109240200&loc=d3e30700-110894 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=109240200&loc=d3e30690-110894 + Details
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