INVESTMENTS - Equity Investments Ownership Interest and Carrying Value (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Equity Investments
Equity investments	$ 2,128	$ 1,712
Air France-KLM
Equity Investments
Ownership interest (percent)	3.00%	6.00%
Carrying value	$ 97	$ 165
China Eastern
Equity Investments
Ownership interest (percent)	2.00%	2.00%
Carrying value	$ 189	$ 177
CLEAR
Equity Investments
Ownership interest (percent)	5.00%	6.00%
Carrying value	$ 227	$ 260
Hanjin-KAL
Equity Investments
Ownership interest (percent)	15.00%	13.00%
Carrying value	$ 296	$ 455
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%	20.00%
Carrying value	$ 403	$ 0
Wheels Up
Equity Investments
Ownership interest (percent)	21.00%	21.00%
Carrying value	$ 54	$ 241
Other Investments
Equity Investments
Carrying value	$ 285	$ 255
Grupo Aeromexico
Equity Investments
Ownership interest (percent)	20.00%	51.00%
Carrying value	$ 412	$ 0
Unifi Aviation
Equity Investments
Ownership interest (percent)	49.00%	49.00%
Carrying value	$ 165	$ 159