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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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