Long-term Debt, Short-term Borrowings and Finance Lease Obligations - Senior Notes and General Debt (Details)	1 Months Ended		12 Months Ended
	Aug. 31, 2024 USD ($) $ / shares	Mar. 31, 2021 USD ($) day $ / shares	Dec. 31, 2025 USD ($)	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Aug. 16, 2024 USD ($)
Debt Instrument [Line Items]
Gain on debt extinguishments			$ 0	$ 22,000,000	$ 0
Repayment of long-term debt			461,000,000	748,000,000	347,000,000
Pledged assets not separately reported flight equipment			7,300,000,000
Interest paid, including capitalized interest, operating and investing activities			$ 427,000,000	230,000,000	80,000,000
Convertible Senior Notes Due 2026 \| Convertible Debt
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage		0.50%	0.50%
Principal amount		$ 750,000,000
Proceeds from offering		$ 734,000,000
Debt instrument, conversion ratio		0.0385802
Debt instrument, convertible ratio (in dollars per share) \| $ / shares		$ 25.92
Debt extinguishment expense			$ 425,000,000
Gain on debt extinguishments				22,000,000
Effective percentage			0.50%
Interest expense			$ 3,000,000	6,000,000	7,000,000
Debt issuance costs amortization			2,000,000	3,000,000	3,000,000
Carrying Value			325,000,000	323,000,000
Contractual interest expense			$ 1,000,000	3,000,000	$ 4,000,000
Convertible Senior Notes Due 2026 \| Convertible Debt \| Debt Instrument, Redemption, Period One
Debt Instrument [Line Items]
Debt instrument, redemption price, percentage		100.00%
Trading days \| day		20
Convertible Senior Notes Due 2026 \| Convertible Debt \| Debt Instrument, Redemption, Period Two
Debt Instrument [Line Items]
Debt instrument, redemption price, percentage		130.00%
Trading days \| day		30
2.50% convertible senior notes, due through 2029
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage			2.50%
Carrying Value			$ 460,000,000	460,000,000
2.50% convertible senior notes, due through 2029 \| Convertible Debt
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	2.50%		2.50%
Principal amount	$ 460,000,000					$ 400,000,000
Debt instrument, conversion ratio	0.1633987
Debt instrument, convertible ratio (in dollars per share) \| $ / shares	$ 6.12
Debt instrument, redemption price, percentage	100.00%
Effective percentage			2.54%
Interest expense			$ 14,000,000	5,000,000
Debt issuance costs amortization			2,000,000	1,000,000
Carrying Value			452,000,000	450,000,000
Contractual interest expense			$ 12,000,000	$ 4,000,000
2.50% convertible notes, due through 2029, additional option \| Convertible Debt
Debt Instrument [Line Items]
Principal amount						$ 60,000,000

JETBLUE AIRWAYS CORP 10-K