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REVENUE FROM CONTRACTS WITH CUSTOMERS - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023 | Dec. 31, 2023
Deferred Revenue Arrangement [Line Items] |  |  |  |  |
Receivable | $ 370 |  | $ 370 |  | $ 383
Costs and Expenses | 2,575 | $ 2,501 | 4,973 | $ 4,883 |
Mileage Plan Revenue [Member] |  |  |  |  |
Deferred Revenue Arrangement [Line Items] |  |  |  |  |
Contract liability revenue recognized |  |  | 613 | 602 |
Receivable | 87 |  | 87 |  | $ 102
Mileage Plan Revenue [Member] | Mileage plan other revenue [Member] |  |  |  |  |
Deferred Revenue Arrangement [Line Items] |  |  |  |  |
Contract liability revenue recognized |  |  | (67) | (52) |
Passenger Revenue [Member] |  |  |  |  |
Deferred Revenue Arrangement [Line Items] |  |  |  |  |
Contract liability revenue recognized | $ 150 | $ 103 | $ 717 | $ 588 |

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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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- Definition Total costs of sales and operating expenses for the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483621/220-10-S99-2 + Details
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- Definition The total amount due to the entity within one year of the balance sheet date (or one operating cycle, if longer) from outside sources, including trade accounts receivable, notes and loans receivable, as well as any other types of receivables, net of allowances established for the purpose of reducing such receivables to an amount that approximates their net realizable value. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 852 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 10 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481372/852-10-55-10 + Details
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