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INVESTMENTS - Equity Investments Ownership Interest and Carrying Value (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Investments [Line Items]
Equity investments	$ 3,247	$ 3,457
Air France-KLM
Investments [Line Items]
Ownership interest (percent)	3.00%	3.00%
Carrying value	$ 82	$ 110
China Eastern
Investments [Line Items]
Ownership interest (percent)	2.00%	2.00%
Carrying value	$ 116	$ 134
Hanjin-KAL
Investments [Line Items]
Ownership interest (percent)	15.00%	15.00%
Carrying value	$ 439	$ 561
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	$ 756	$ 658
Wheels Up
Investments [Line Items]
Ownership interest (percent)	38.00%	38.00%
Carrying value	$ 756	$ 903
Voting rights, shares held threshold	29.90%
Other investments
Investments [Line Items]
Carrying value	$ 496	$ 508
Grupo Aeromexico
Investments [Line Items]
Ownership interest (percent)	20.00%	20.00%
Carrying value	$ 441	$ 421
Unifi Aviation
Investments [Line Items]
Ownership interest (percent)	49.00%	49.00%
Carrying value	$ 161	$ 162

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