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Investments - Equity investments (Details) - USD ($)	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Investments, Debt and Equity Securities [Abstract]
Equity method investments	$ 47,000,000		$ 43,000,000
JetBlue Ventures equity investments	79,000,000		96,000,000
TWA Flight Center	14,000,000		14,000,000
Total equity investments	140,000,000		$ 153,000,000
Schedule of Equity Method Investments [Line Items]
Gain (loss) on equity method investments	0	$ 0
Gain (loss) on equity investments without a readily determinable fair value	$ 0	$ 0
TWA Flight Center Hotel
Schedule of Equity Method Investments [Line Items]
Ownership percentage	10.00%

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