The carrying amount, as of the date of the latest financial statement presented, of flight equipment which are owned but transferred to serve as collateral for the payment of the related debt obligation, primarily a secured borrowing or repurchase agreement, and for which the transferee is not permitted to sell or re-pledge them to an unrelated party.

No definition available.

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, 2024 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Aug. 16, 2024 USD ($)
Debt Instrument [Line Items]
Debt extinguishment expense				$ 0	$ 0
Gain on debt extinguishments			$ 22,000,000	0	0
Repayment of long-term debt			748,000,000	347,000,000	369,000,000
Pledged assets not separately reported flight equipment			7,300,000,000
Interest paid, including capitalized interest, operating and investing activities			$ 230,000,000	80,000,000	124,000,000
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			$ 6,000,000	7,000,000	7,000,000
Debt issuance costs amortization			3,000,000	3,000,000	3,000,000
Carrying Value			323,000,000	742,000,000
Contractual interest expense			$ 3,000,000	4,000,000	$ 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	$ 0
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			2.60%
Interest expense			$ 5,000,000
Debt issuance costs amortization			1,000,000
Carrying Value			450,000,000
Contractual interest expense			$ 4,000,000
2.50% convertible notes, due through 2029, additional option \| Convertible Debt
Debt Instrument [Line Items]
Principal amount						$ 60,000,000