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v3.19.3.a.u2

REVENUE FROM CONTRACTS WITH CUSTOMERS Narrative (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2019 USD ($) agreement | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Deferred Revenue Arrangement [Line Items] |  |  |
Percent of Mileage Breakage | 17.40% | 17.40% |
Contract cost recognized | $ 208 | $ 217 | $ 238
Receivable | $ 323 | 366 |
Number of Partner AIrlines | agreement | 17 |  |
Prepaid Expenses and Other Current Assets [Member] |  |  |
Deferred Revenue Arrangement [Line Items] |  |  |
Capitalized Contract Cost, Net | $ 27 | 23 |
Passenger Revenue [Member] |  |  |
Deferred Revenue Arrangement [Line Items] |  |  |
Contract with Customer, Liability, Revenue Recognized | 577 | 583 |
Mileage Plan Revenue [Member] |  |  |
Deferred Revenue Arrangement [Line Items] |  |  |
Receivable | $ 105 | $ 119 |

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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 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(5)) -URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(3)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 210 -Section S99 -Paragraph 3 -Subparagraph (SX 210.6-06(3)) -URI http://asc.fasb.org/extlink&oid=6488278&loc=d3e604059-122996 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(4)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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