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Segments - Schedule of Segment Reporting (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018
Segment Reporting Information, Profit (Loss) |  |  |
Operating revenue | $ 10,472 | $ 9,968 |
Operating income | 1,020 | 844 |
Interest expense (income), net | 83 | 92 |
Depreciation and amortization | 615 | 603 |
Total assets, end of period | 61,841 | 58,968 | $ 60,266
Capital expenditures | 1,360 | 1,265 |
Operating Segments | Airline |  |  |
Segment Reporting Information, Profit (Loss) |  |  |
Operating revenue | 10,424 | 9,755 |
Operating income | 1,054 | 800 |
Interest expense (income), net | 92 | 97 |
Depreciation and amortization | 592 | 588 |
Total assets, end of period | 60,343 | 56,929 |
Capital expenditures | 1,350 | 1,250 |
Operating Segments | Refinery |  |  |
Segment Reporting Information, Profit (Loss) |  |  |
Operating revenue | 1,283 | 1,491 |
Operating income | (34) | 44 |
Interest expense (income), net | (9) | (5) |
Depreciation and amortization | 23 | 15 |
Total assets, end of period | 1,498 | 2,039 |
Capital expenditures | 10 | 15 |
Intersegment Sales/Other |  |  |
Segment Reporting Information, Profit (Loss) |  |  |
Operating income | 0 | 0 |
Interest expense (income), net | 0 | 0 |
Depreciation and amortization | 0 | 0 |
Total assets, end of period | 0 | 0 |
Capital expenditures | 0 | 0 |
Intersegment Sales/Other | Sales to airline segment |  |  |
Segment Reporting Information, Profit (Loss) |  |  |
Operating revenue | (271) | (262) |
Intersegment Sales/Other | Exchanged products |  |  |
Segment Reporting Information, Profit (Loss) |  |  |
Operating revenue | (732) | (876) |
Intersegment Sales/Other | Sales of refined products |  |  |
Segment Reporting Information, Profit (Loss) |  |  |
Operating revenue | $ (232) | $ (140) |

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