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Revenue - Air Traffic Liability - Loyalty Program Rollforward (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Movement in Deferred Revenue |  |  |  |
Air traffic liability - loyalty program - beginning balance | $ 3,856 | $ 3,289 | $ 3,385 | $ 3,011
Amounts deferred associated with points awarded | 447 | 727 | 1,488 | 2,195
Revenue recognized from points redeemed - Passenger | (205) | (657) | (747) | (1,814)
Revenue recognized from points redeemed - Other | (16) | (20) | (44) | (53)
Unused funds converted to loyalty points | 105 | 0 | 105 | 0
Air traffic liability - loyalty program - ending balance | $ 4,187 | $ 3,339 | $ 4,187 | $ 3,339

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- Definition Amount of deferred income and obligation to transfer product and service to customer for which consideration has been received or is receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(5)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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