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REVENUE RECOGNITION - Loyalty Program Liability (Details) - Loyalty program - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Loyalty Program |  |  |
Current and noncurrent deferred revenue, beginning | $ 7,882 | $ 7,559 | $ 7,182
Miles earned | 4,173 | 3,419 | 2,238
Travel miles redeemed | (3,462) | (2,898) | (1,786)
Non-travel miles redeemed | (173) | (198) | (75)
Current and noncurrent deferred revenue, ending | $ 8,420 | $ 7,882 | $ 7,559

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- Definition Loyalty Program Liability, Mileage Credits Earned + References No definition available. + Details
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- Definition Loyalty Program Liability, Non-Travel Mileage Credits Redeemed + 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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- Details
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