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Revenue Recognition - Contract Liabilities (Details) - USD ($) $ in Millions | Sep. 30, 2021 | Dec. 31, 2020
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Revenue from Contract with Customer [Abstract] |  |
Air traffic liability - passenger travel | $ 1,416 | $ 964
Air traffic liability - loyalty program (air transportation) | 1,473 | 825
Total | $ 2,889 | $ 1,789

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- Definition Air Traffic Liability - Loyalty Program And Deferred Revenue + References No definition available. + Details
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- Definition Air Traffic Liability - Passenger Travel + References No definition available. + Details
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- Definition Amount of obligation to transfer good or 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 606 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=123360276&loc=SL49130531-203044 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130549-203045 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=123360276&loc=SL49130532-203044 + Details
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