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REVENUE - Air Traffic Liability Rollforward (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022
Air traffic liability |  |
Beginning balance | $ 8,250 | $ 7,725
Current period sales (passenger travel, ancillary services, flight loyalty, and partner loyalty) | 23,766 | 22,012
Revenue from amounts included in contract liability opening balances | (5,031) | (4,976)
Revenue from current period sales | (18,706) | (16,511)
Ending balance | $ 8,279 | $ 8,250

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- Definition Air Traffic Liability + References No definition available. + Details
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- Definition Contract With Customer, Liability, Additions + References No definition available. + Details
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Balance Type: | credit
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- Definition Contract With Customer, Liability, Revenue Recognized, Current Period + 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 -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479837/606-10-45-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 8 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479806/606-10-50-8 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479837/606-10-45-2 + Details
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- Definition Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 8 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479806/606-10-50-8 + Details
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