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Revenue Recognition - Other Revenue (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018
Disaggregation of Revenue [Line Items] |  |
Operating revenue | $ 10,472 | $ 9,968
Other |  |
Disaggregation of Revenue [Line Items] |  |
Operating revenue | 1,026 | 1,001
Loyalty program |  |
Disaggregation of Revenue [Line Items] |  |
Operating revenue | 474 | 347
Ancillary businesses and refinery |  |
Disaggregation of Revenue [Line Items] |  |
Operating revenue | 369 | 521
Miscellaneous |  |
Disaggregation of Revenue [Line Items] |  |
Operating revenue | $ 183 | $ 133

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