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Investments - Equity investments (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Investments, Debt and Equity Securities [Abstract]
Equity method investments	$ 71,000,000		$ 71,000,000		$ 43,000,000
JetBlue Ventures equity investments	78,000,000		78,000,000		96,000,000
TWA Flight Center	13,000,000		13,000,000		14,000,000
Total equity investments	162,000,000		162,000,000		$ 153,000,000
Schedule of Equity Method Investments [Line Items]
Realized gain (loss) recognized in gain (loss) on investments, net	$ (3,000,000)	$ (1,000,000)	$ (5,000,000)	$ (1,000,000)
TWA Flight Center Hotel
Schedule of Equity Method Investments [Line Items]
Ownership percentage	10.00%		10.00%
Realized gain (loss) recognized in gain (loss) on investments, net	$ 0	$ 0	$ 0	$ 0

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