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Revenue - Passenger Revenue Breakout (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Disaggregation of Revenue [Line Items] |  |  |  |
Operating Revenue | $ 5,639 | $ 5,575 | $ 16,698 | $ 16,261
Passenger Revenue Non Loyalty |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Operating Revenue | 4,400 | 4,417 | 13,126 | 12,969
Passenger Loyalty Air Transportation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Operating Revenue | 657 | 623 | 1,814 | 1,702
Passenger Ancillary Sold Separately |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Operating Revenue | 173 | 154 | 522 | 466
Passenger |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Operating Revenue | $ 5,230 | $ 5,194 | $ 15,462 | $ 15,137

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