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Revenue Recognition - Revenue by Geographic Region (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
Domestic |  |
Disaggregation of Revenue [Line Items] |  |
Operating revenue | 7,487 | 7,111
Atlantic |  |
Disaggregation of Revenue [Line Items] |  |
Operating revenue | 1,316 | 1,253
Latin America |  |
Disaggregation of Revenue [Line Items] |  |
Operating revenue | 964 | 917
Pacific |  |
Disaggregation of Revenue [Line Items] |  |
Operating revenue | 705 | 687
Passenger |  |
Disaggregation of Revenue [Line Items] |  |
Operating revenue | 9,254 | 8,765
Passenger | Domestic |  |
Disaggregation of Revenue [Line Items] |  |
Operating revenue | 6,713 | 6,282
Passenger | Atlantic |  |
Disaggregation of Revenue [Line Items] |  |
Operating revenue | 1,103 | 1,070
Passenger | Latin America |  |
Disaggregation of Revenue [Line Items] |  |
Operating revenue | 855 | 830
Passenger | Pacific |  |
Disaggregation of Revenue [Line Items] |  |
Operating revenue | $ 583 | $ 583

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