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Revenue - Air Traffic Liability Breakout (Details) - USD ($) $ in Millions | Jun. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019
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Revenue from Contract with Customer [Abstract] |  |  |  |  |  |
Air traffic liability - passenger travel and ancillary passenger services | $ 3,960 |  | $ 2,686 |  |  |
Air traffic liability - loyalty program | 4,719 | $ 4,623 | 4,447 | $ 3,856 | $ 3,561 | $ 3,385
Total Air traffic liability | $ 8,679 |  | $ 7,133 | $ 6,879 |  | $ 5,510

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- Definition Contract With Customer Liability, Air Traffic Liability, Loyalty Program + References No definition available. + Details
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- Definition Contract With Customer Liability, Air Traffic Liability, Passenger Travel And Ancillary Passenger Services + 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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