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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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-Topic 825
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-Name Accounting Standards Codification
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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 235
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