INVESTMENTS - Equity Investments Ownership and Carrying Value (Details) - USD ($) $ in Millions	Jun. 30, 2026	Dec. 31, 2025
Investments [Line Items]
Equity investments	$ 4,041	$ 4,222
Grupo Aeroméxico
Investments [Line Items]
Ownership interest (percent)	19.00%	19.00%
Carrying Value	$ 384	$ 377
Unifi Aviation
Investments [Line Items]
Ownership interest (percent)	20.00%	20.00%
Carrying Value	$ 48	$ 51
Air France-KLM
Investments [Line Items]
Ownership interest (percent)	3.00%	3.00%
Carrying Value	$ 115	$ 100
China Eastern
Investments [Line Items]
Ownership interest (percent)	2.00%	2.00%
Carrying Value	$ 188	$ 319
Hanjin KAL
Investments [Line Items]
Ownership interest (percent)	15.00%	15.00%
Carrying Value	$ 757	$ 861
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)	11.00%	11.00%
Carrying Value	$ 1,764	$ 1,644
Republic Airways
Investments [Line Items]
Ownership interest (percent)	14.00%	14.00%
Carrying Value	$ 142	$ 124
WestJet
Investments [Line Items]
Ownership interest (percent)	13.00%	13.00%
Carrying Value	$ 248	$ 248
Wheels Up
Investments [Line Items]
Ownership interest (percent)	36.00%	36.00%
Carrying Value	$ 118	$ 173
Voting rights, shares held threshold	29.90%
Other investments
Investments [Line Items]
Carrying Value	$ 277	$ 325

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Equity Securities, FV-NI, Ownership Percentage

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