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INVESTMENTS - Equity Investments Ownership Interest and Carrying Value (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Equity Investments
Equity investments	$ 2,249	$ 2,128
Air France-KLM
Equity Investments
Ownership interest (percent)	3.00%	3.00%
Carrying value	$ 135	$ 97
China Eastern
Equity Investments
Ownership interest (percent)	2.00%	2.00%
Carrying value	$ 184	$ 189
CLEAR
Equity Investments
Ownership interest (percent)	5.00%	5.00%
Carrying value	$ 217	$ 227
Hanjin-KAL
Equity Investments
Ownership interest (percent)	15.00%	15.00%
Carrying value	$ 351	$ 296
Hanjin-KAL | Common and Preferred Shares
Equity Investments
Ownership interest (percent)	14.80%
Hanjin-KAL | Common Stock
Equity Investments
Ownership interest (percent)	14.90%
LATAM
Equity Investments
Ownership interest (percent)	10.00%	10.00%
Carrying value	$ 455	$ 403
Other investments
Equity Investments
Carrying value	$ 300	$ 285
Wheels Up
Equity Investments
Ownership interest (percent)	21.00%	21.00%
Carrying value	$ 33	$ 54
Grupo Aeromexico
Equity Investments
Ownership interest (percent)	20.00%	20.00%
Carrying value	$ 410	$ 412
Unifi Aviation
Equity Investments
Ownership interest (percent)	49.00%	49.00%
Carrying value	$ 164	$ 165

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