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Long-term Debt, Short-term Borrowings and Finance Lease Obligations - Schedule of Carrying Amounts and Estimated Fair Value of Debt (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Debt Instrument [Line Items]
Long-term debt	$ 4,992	$ 4,716
Long term debt, fair value	5,085	4,691
Finance lease, liability	20	0
Fixed rate special facility bonds, due through 2036
Debt Instrument [Line Items]
Long-term debt	42	42
Long term debt, fair value	43	43
2019-1 Series AA, due through 2032
Debt Instrument [Line Items]
Long-term debt	477	476
Long term debt, fair value	483	474
2019-1 Series A, due through 2028
Debt Instrument [Line Items]
Long-term debt	149	149
Long term debt, fair value	151	150
2019-1 Series B, due through 2027
Debt Instrument [Line Items]
Long-term debt	70	70
Long term debt, fair value	86	86
2020-1 Series A, due through 2032
Debt Instrument [Line Items]
Long-term debt	506	506
Long term debt, fair value	606	597
2020-1 Series B, due through 2028
Debt Instrument [Line Items]
Long-term debt	117	117
Long term debt, fair value	150	150
Fixed rate equipment notes, due through 2028
Debt Instrument [Line Items]
Long-term debt	290	322
Long term debt, fair value	278	305
Floating rate equipment notes, due through 2030
Debt Instrument [Line Items]
Long-term debt	101	109
Long term debt, fair value	106	113
Aircraft sale-leaseback transactions, due through 2036
Debt Instrument [Line Items]
Long-term debt	1,962	1,648
Long term debt, fair value	2,121	1,738
Unsecured CARES Act Payroll Support Program loan, due through 2030
Debt Instrument [Line Items]
Long-term debt	259	259
Long term debt, fair value	190	184
Unsecured Consolidated Appropriations Act Payroll Support Program Extension loan, due through 2031
Debt Instrument [Line Items]
Long-term debt	144	144
Long term debt, fair value	104	101
Unsecured American Rescue Plan Act of 2021 Payroll Support loan, due through 2031
Debt Instrument [Line Items]
Long-term debt	132	132
Long term debt, fair value	96	93
Non Public Convertible Senior Notes Due 2026 [Member]
Debt Instrument [Line Items]
Long-term debt	743	742
Long term debt, fair value	$ 671	$ 657
Debt instrument, interest rate, stated percentage (in percent)	0.50%

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