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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details) $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2022 USD ($) | Dec. 31, 2023 USD ($) | Mar. 31, 2023 USD ($) | Dec. 31, 2024 USD ($) segment | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) aircraft
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Reimbursement costs | $ 390 |  | $ 55 |  |  |
Accrued expense on settlement |  | $ 107 |  |  |  |
Impairment charges |  |  |  |  |  | $ 28
Number of aircraft under accelerated retirement | aircraft |  |  |  |  |  | 10
Impaired of assets to be retired |  |  |  | $ 0 | $ 0 |
Total operating revenues |  |  |  | 27,483 | 26,091 | $ 23,814
Advertising costs |  |  |  | 346 | 266 | 224
Capitalized computer software, net |  | 1,000 |  | 1,100 | 1,000 |
Computer software depreciation expense |  |  |  | $ 271 | 246 | 232
Length of agreements with co-brand, payment, and loyalty partners (in years) |  |  |  | 10 years |  |
Number of operating segments | segment |  |  |  | 1 |  |
Number of reportable segments | segment |  |  |  | 1 |  |
Workforce Subject to Collective Bargaining Arrangements | Unionized Employees concentration risk |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Full-time employees unionized (as a percent) |  |  |  | 82.00% |  |
Latin America |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Total operating revenues |  |  |  | $ 798 | 828 | 811
North America |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Total operating revenues |  |  |  | 26,700 | 25,000 | $ 23,000
Other Intangible Assets |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Gross carrying amount of indefinite-lived intangible assets |  | 296 |  | $ 296 | 296 |
Ground property and equipment |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Minimum percentage of cost estimated residual value (as a percent) |  |  |  | 0.00% |  |
Maximum percentage of cost estimated as residual value (as a percent) |  |  |  | 10.00% |  |
Aircraft Residual Value |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Minimum percentage of cost estimated residual value (as a percent) |  |  |  | 14.00% |  |
Maximum percentage of cost estimated as residual value (as a percent) |  |  |  | 20.00% |  |
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 |  |
Designated as Hedging Instrument |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Gross amounts offset in the balance sheet |  | 0 |  | $ 0 | 0 |
Fuel derivative contracts |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Collateral deposits |  | 50 |  | 22 | 50 |
Fuel derivative contracts | Other assets |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Gross amounts offset in the balance sheet |  | 35 |  | 18 | 35 |
Fuel derivative contracts | Other assets | Designated as Hedging Instrument |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Gross amounts offset in the balance sheet |  | 0 |  | 0 | 0 |
Interest Rate Swap |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Collateral deposits |  | 0 |  | 0 | 0 |
Interest Rate Swap | Other assets | Designated as Hedging Instrument |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Gross amounts offset in the balance sheet |  | $ 0 |  | $ 0 | $ 0 |

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