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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	Jun. 30, 2023	Dec. 31, 2022
Debt Instrument [Line Items]
Long-term debt	$ 3,756	$ 3,645
Long term debt, fair value	2,855	2,848
Finance lease, liability	1	2
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	490	504
Long term debt, fair value	352	345
2019-1 Series A, due through 2028
Debt Instrument [Line Items]
Long-term debt	153	157
Long term debt, fair value	126	124
2019-1 Series B, due through 2027
Debt Instrument [Line Items]
Long-term debt	76	82
Long term debt, fair value	81	87
2020-1 Series A, due through 2032
Debt Instrument [Line Items]
Long-term debt	527	546
Long term debt, fair value	455	457
2020-1 Series B, due through 2028
Debt Instrument [Line Items]
Long-term debt	126	135
Long term debt, fair value	134	142
Fixed rate enhanced equipment notes, due through 2023
Debt Instrument [Line Items]
Long-term debt	0	61
Long term debt, fair value	0	60
Fixed rate equipment notes, due through 2028
Debt Instrument [Line Items]
Long-term debt	381	447
Long term debt, fair value	320	422
Floating rate equipment notes, due through 2030
Debt Instrument [Line Items]
Long-term debt	120	56
Long term debt, fair value	100	49
Sale-leaseback transactions, due through 2035
Debt Instrument [Line Items]
Long-term debt	565	341
Long term debt, fair value	419	329
Unsecured CARES Act Payroll Support Program loan, due through 2030
Debt Instrument [Line Items]
Long-term debt	259	259
Long term debt, fair value	130	126
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	70	68
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	65	62
Convertible senior notes due 2026
Debt Instrument [Line Items]
Long-term debt	741	739
Long term debt, fair value	$ 560	$ 534

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