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Revenue - Passenger Revenue Breakout (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017
Disaggregation of Revenue [Line Items] |  |
Passenger Revenue | $ 4,585 | $ 4,546
Passenger Revenue Non Loyalty |  |
Disaggregation of Revenue [Line Items] |  |
Passenger Revenue | 3,948 | 3,907
Passenger Loyalty Air Transportation |  |
Disaggregation of Revenue [Line Items] |  |
Passenger Revenue | 491 | 507
Passenger Ancillary Sold Separately |  |
Disaggregation of Revenue [Line Items] |  |
Passenger Revenue | $ 146 | $ 132

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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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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- Details
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- Details
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