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Investments - Equity investments (Details) - USD ($)	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024
Investments, Debt and Equity Securities [Abstract]
Equity method investments	$ 88,000,000		$ 77,000,000
JetBlue Ventures equity investments	89,000,000		84,000,000
TWA Flight Center	12,000,000		13,000,000
Total equity investments	189,000,000		$ 174,000,000
Schedule of Equity Method Investments [Line Items]
Realized gain (loss) recognized in gain (loss) on investments, net	$ 1,000,000	$ 0
TWA Flight Center Hotel
Schedule of Equity Method Investments [Line Items]
Ownership percentage	10.00%
Realized gain (loss) recognized in gain (loss) on investments, net	$ 0	$ 0

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