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INVESTMENTS - Narrative (Details) - USD ($)	1 Months Ended	3 Months Ended
	Mar. 31, 2022	Dec. 31, 2022	Dec. 31, 2021
Grupo Aeromexico
Schedule of Equity Method Investments [Line Items]
New capital stock after consolidation and exchange as percentage of previously outstanding	0.01%
LATAM
Schedule of Equity Method Investments [Line Items]
Payment to acquire equity investment		$ 657,000,000
Ownership interest (percent)		10.00%	20.00%
Grupo Aeromexico
Schedule of Equity Method Investments [Line Items]
Payment to acquire equity investment	$ 100,000,000
Virgin Atlantic
Schedule of Equity Method Investments [Line Items]
Ownership interest (percent)		49.00%
Carrying value of equity investment		$ 0
Unrecognized equity method losses		$ 300,000,000
Grupo Aeromexico
Schedule of Equity Method Investments [Line Items]
Ownership interest (percent)		20.00%	51.00%
Carrying value of equity investment		$ 412,000,000	$ 0

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