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INVESTMENTS - Narrative (Details) - USD ($) | 1 Months Ended | 3 Months Ended |
--- | --- | --- | ---
Mar. 31, 2022 | Dec. 31, 2022 | Dec. 31, 2021
Grupo Aeromexico |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
New capital stock after consolidation and exchange as percentage of previously outstanding | 0.01% |  |
LATAM |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Payment to acquire equity investment |  | $ 657,000,000 |
Ownership interest (percent) |  | 10.00% | 20.00%
Grupo Aeromexico |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Payment to acquire equity investment | $ 100,000,000 |  |
Virgin Atlantic |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership interest (percent) |  | 49.00% |
Carrying value of equity investment |  | $ 0 |
Unrecognized equity method losses |  | $ 300,000,000 |
Grupo Aeromexico |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership interest (percent) |  | 20.00% | 51.00%
Carrying value of equity investment |  | $ 412,000,000 | $ 0

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