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REVENUE FROM CONTRACTS WITH CUSTOMERS Narrative (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2021 USD ($) aircraft | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Deferred Revenue Arrangement [Line Items] |  |  |
Percent of Mileage Breakage | 17.40% | 17.40% |
Contract cost recognized | $ 90 | $ 43 | $ 208
Receivable | $ 546 | 480 |
Number of Partner AIrlines | aircraft | 23 |  |
Credit Card Receivables | $ 167 | 83 |
Prepaid Expenses and Other Current Assets [Member] |  |  |
Deferred Revenue Arrangement [Line Items] |  |  |
Capitalized Contract Cost, Net | 37 | 24 |
Passenger Revenue [Member] |  |  |
Deferred Revenue Arrangement [Line Items] |  |  |
Contract with Customer, Liability, Revenue Recognized | 703 | 502 |
Mileage Plan Revenue [Member] |  |  |
Deferred Revenue Arrangement [Line Items] |  |  |
Receivable | $ 62 | $ 48 |

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- Definition Amount, after accumulated amortization and accumulated impairment loss, of asset recognized from cost incurred to obtain or fulfill contract with customer. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 340 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123353750&loc=SL49131252-203054 + Details
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