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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2021 USD ($) aircraft | Dec. 31, 2020 USD ($) aircraft | Dec. 31, 2019 USD ($) | Mar. 13, 2019 aircraft | Dec. 31, 2018 USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Payroll support and voluntary employee programs, net | $ 2,960 | $ 967 | $ 0 |  |
Other (gains) losses, net | 22 | (158) | (8) |  |
Stockholders' equity attributable to parent | 10,414 | 8,876 | 9,832 |  | $ 9,853
Impairment charges | $ 12 | $ 32 |  |  |
Number of aircraft under accelerated retirement | aircraft | 20 | 8 |  |  |
Total operating revenues | $ 15,790 | $ 9,048 | 22,428 |  |
Advertising costs | 185 | 156 | 212 |  |
Capitalized computer software, net | 886 | 697 |  |  |
Computer software depreciation expense | $ 213 | 203 | 177 |  |
Number of aircraft grounded | aircraft |  |  |  | 34 |
Length of agreements with co-brand, payment, and loyalty partners (in years) | 10 years |  |  |  |
Unionized Employees concentration risk | Workforce Subject to Collective Bargaining Arrangements |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Full-time employees unionized (as a percent) | 82.00% |  |  |  |
Unionized Employees concentration risk | Number of Employees, Total |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Full-time employees unionized (as a percent) | 77.00% |  |  |  |
Latin America |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Total operating revenues | $ 475 | 184 | 615 |  |
North America |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Total operating revenues | 15,300 | 8,900 | 21,800 |  |
Other Intangible Assets |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Gross carrying amount of indefinite-lived intangible assets | $ 295 | 295 |  |  |
Flight equipment |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Maximum percentage of cost estimated as residual value (as a percent) | 15.00% |  |  |  |
Ground property and equipment |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Maximum percentage of cost estimated as residual value (as a percent) | 10.00% |  |  |  |
Minimum percentage of cost estimated residual value (as a percent) | 0.00% |  |  |  |
Maximum | Flight equipment |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Useful life (in years) | 25 years |  |  |  |
Maximum | Ground property and equipment |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Useful life (in years) | 30 years |  |  |  |
Maximum | Software |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Useful life (in years) | 15 years |  |  |  |
Minimum | Ground property and equipment |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Useful life (in years) | 5 years |  |  |  |
Minimum | Software |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Useful life (in years) | 5 years |  |  |  |
Fuel derivative contracts |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Collateral deposits | $ 175 | 34 |  |  |
Interest rate derivatives | Other noncurrent liabilities |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Collateral deposits | 0 |  |  |  |
Retained earnings |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Stockholders' equity attributable to parent | 15,774 | 14,777 | 17,945 |  | 15,967
Accumulated other comprehensive income (loss) |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Stockholders' equity attributable to parent | $ 388 | (105) | $ (61) |  | 20
Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Stockholders' equity attributable to parent |  | 0 |  |  | 55
Cumulative Effect, Period of Adoption, Adjustment | Retained earnings |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Stockholders' equity attributable to parent |  | 20 |  |  | $ 55
Cumulative Effect, Period of Adoption, Adjustment | Accumulated other comprehensive income (loss) |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Stockholders' equity attributable to parent |  | $ (20) |  |  |

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