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INVESTMENTS - Equity Investments Ownership and Carrying Value (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Investments [Line Items] |  |
Carrying Value | $ 3,883 | $ 2,846
Grupo Aeroméxico |  |
Investments [Line Items] |  |
Ownership interest (percent) | 20.00% | 20.00%
Carrying Value | $ 402 | $ 354
Unifi Aviation |  |
Investments [Line Items] |  |
Ownership interest (percent) | 49.00% | 49.00%
Carrying Value | $ 132 | $ 146
Air France-KLM |  |
Investments [Line Items] |  |
Ownership interest (percent) | 3.00% | 3.00%
Carrying Value | $ 98 | $ 62
China Eastern |  |
Investments [Line Items] |  |
Ownership interest (percent) | 2.00% | 2.00%
Carrying Value | $ 199 | $ 155
Hanjin KAL |  |
Investments [Line Items] |  |
Ownership interest (percent) | 15.00% | 15.00%
Carrying Value | $ 712 | $ 507
Hanjin KAL | Common and Preferred Shares |  |
Investments [Line Items] |  |
Ownership interest (percent) | 14.80% |
Hanjin KAL | Common Stock |  |
Investments [Line Items] |  |
Ownership interest (percent) | 14.90% |
LATAM |  |
Investments [Line Items] |  |
Ownership interest (percent) | 10.00% | 10.00%
Carrying Value | $ 1,379 | $ 837
Wheels Up |  |
Investments [Line Items] |  |
Ownership interest (percent) | 37.00% | 38.00%
Carrying Value | $ 485 | $ 435
Voting rights, shares held threshold | 29.90% |
Other investments |  |
Investments [Line Items] |  |
Carrying Value | $ 476 | $ 350

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