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REVENUE FROM CONTRACTS WITH CUSTOMERS Narrative (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2020 USD ($) agreement | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Deferred Revenue Arrangement [Line Items] |  |  |
Percent of Mileage Breakage | 17.40% | 17.40% |
Contract cost recognized | $ 43 | $ 208 | $ 217
Receivable | $ 480 | 323 |
Number of Partner AIrlines | agreement | 17 |  |
Deferred Revenue, Refund Payments | $ 600 |  |
COVID-19 Credits Issued, Balance | 569 |  |
COVID-19 Related Credits Issued | 1,000 |  |
Credit Card Receivables | 83 | 212 |
Prepaid Expenses and Other Current Assets [Member] |  |  |
Deferred Revenue Arrangement [Line Items] |  |  |
Capitalized Contract Cost, Net | 24 | 27 |
Passenger Revenue [Member] |  |  |
Deferred Revenue Arrangement [Line Items] |  |  |
Contract with Customer, Liability, Revenue Recognized | 502 | 577 |
Mileage Plan Revenue [Member] |  |  |
Deferred Revenue Arrangement [Line Items] |  |  |
Receivable | $ 48 | $ 105 |

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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=68051541&loc=SL49131252-203054 + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130549-203045 + Details
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