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Revenue - Air Traffic Liability Rollforward (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Deferred Revenue Arrangement [Line Items] |  |  |
Other Revenue, Net |  | $ 317 | $ 266
Air Traffic Liability Roll Forward |  |  |
ATL, beginning balance |  | 4,565 | 4,221
Current Period Sales |  | 5,403 | 5,415
Revenue amounts in beginning balance | [1] | (1,827) | (1,701)
Revenue from Current Period Sales | [1] | (2,711) | (2,796)
ATL, ending balance |  | $ 5,430 | $ 5,139
[1] | (a) Does not include certain ancillary revenues that are purchased on the day of travel, which do not flow through Air traffic liability.

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- Definition Air Traffic Liability - Revenue amounts in beginning balance + References No definition available. + Details
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- Definition Air Traffic Liability Roll Forward + References No definition available. + Details
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- Definition Air Traffic Liability Total + References No definition available. + Details
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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 Amount, after sales adjustments, returns, allowances, and discounts, of revenue classified as other. + 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(a),(d)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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