v3.26.3
Investments - Equity investments (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Dec. 31, 2025
Schedule of Equity Method Investments [Line Items]          
Equity method investments $ 119,000,000   $ 119,000,000   $ 109,000,000
JetBlue Ventures equity investments 88,000,000   88,000,000   89,000,000
TWA flight center 13,000,000   13,000,000   13,000,000
Total equity investments 220,000,000   220,000,000   $ 211,000,000
Realized (loss) recognized in gain (loss) on investments, net $ 0 $ (1,000,000) $ 1,000,000 $ (4,000,000)  
TWA Flight Center Hotel          
Schedule of Equity Method Investments [Line Items]          
Ownership percentage 9.00%   9.00%    
Realized (loss) recognized in gain (loss) on investments, net $ 0 $ 0 $ 0 $ 0