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Revenue - Air Traffic Liability - Loyalty Program Rollforward (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Movement in Deferred Revenue |  |  |  |
Air traffic liability - loyalty program - beginning balance | $ 2,799 | $ 2,560 | $ 2,667 | $ 2,485
Amounts deferred associated with points awarded | 719 | 632 | 1,349 | 1,216
Revenue recognized from points redeemed - Passenger | (588) | (602) | (1,079) | (1,108)
Revenue recognized from points redeemed - Other | (11) | (4) | (18) | (7)
Air traffic liability - loyalty program - ending balance | $ 2,919 | $ 2,586 | $ 2,919 | $ 2,586

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- Definition Passenger Revenue Recognized From Points Redeemed + References No definition available. + Details
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- Definition Amount of deferred revenue as of balance sheet date. Deferred revenue represents collections of cash or other assets related to a revenue producing activity for which revenue has not yet been recognized. Generally, an entity records deferred revenue when it receives consideration from a customer before achieving certain criteria that must be met for revenue to be recognized in conformity with GAAP. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 605 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 13.A.3) -URI http://asc.fasb.org/extlink&oid=65893310&loc=d3e214044-122780 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 605 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 13.A.4(a).Q1) -URI http://asc.fasb.org/extlink&oid=65893310&loc=d3e214044-122780 + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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