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Revenue - Passenger Revenue Breakout (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Disaggregation of Revenue [Line Items] |  |  |  |
Passenger Revenue | $ 5,358 | $ 5,379 | $ 9,943 | $ 9,925
Passenger Revenue Non Loyalty |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Passenger Revenue | 4,605 | 4,643 | 8,552 | 8,551
Passenger Loyalty Air Transportation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Passenger Revenue | 588 | 602 | 1,079 | 1,108
Passenger Ancillary Sold Separately |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Passenger Revenue | $ 165 | $ 134 | $ 312 | $ 266

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- Definition A transportation (plane, train, ship) carrier's fare revenue recognized in the period from carrying passengers between destinations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1(d)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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