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INVESTMENTS - Equity Investments Ownership Interest and Carrying Value (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Equity Investments |  |
Equity investments | $ 2,846 | $ 3,457
Air France-KLM |  |
Equity Investments |  |
Ownership Interest | 3.00% | 3.00%
Carrying Value | $ 62 | $ 110
China Eastern |  |
Equity Investments |  |
Ownership Interest | 2.00% | 2.00%
Carrying Value | $ 155 | $ 134
Hanjin-KAL |  |
Equity Investments |  |
Ownership Interest | 15.00% | 15.00%
Carrying Value | $ 507 | $ 561
Hanjin-KAL | Common and Preferred Shares |  |
Equity Investments |  |
Ownership Interest | 14.80% |
Hanjin-KAL | Common Stock |  |
Equity Investments |  |
Ownership Interest | 14.90% |
LATAM |  |
Equity Investments |  |
Ownership Interest | 10.00% | 10.00%
Carrying Value | $ 837 | $ 658
Wheels Up |  |
Equity Investments |  |
Ownership Interest | 38.00% | 38.00%
Carrying Value | $ 435 | $ 903
Voting rights, shares held threshold | 29.90% |
Other investments |  |
Equity Investments |  |
Carrying Value | $ 350 | $ 508
Grupo Aeroméxico |  |
Equity Investments |  |
Ownership Interest | 20.00% | 20.00%
Carrying Value | $ 354 | $ 421
Unifi Aviation |  |
Equity Investments |  |
Ownership Interest | 49.00% | 49.00%
Carrying Value | $ 146 | $ 162

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