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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	Sep. 30, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Long-term debt	$ 4,124	$ 4,800
Long term debt, fair value	4,093	4,930
Finance lease, liability	27	63
Fixed rate special facility bonds, due through 2036
Debt Instrument [Line Items]
Long-term debt	42	42
Long term debt, fair value	46	45
2019-1 Series AA, due through 2032
Debt Instrument [Line Items]
Long-term debt	547	560
Long term debt, fair value	464	440
2019-1 Series A, due through 2028
Debt Instrument [Line Items]
Long-term debt	170	174
Long term debt, fair value	157	152
2019-1 Series B, due through 2027
Debt Instrument [Line Items]
Long-term debt	101	107
Long term debt, fair value	132	139
2020-1 Series A, due through 2032
Debt Instrument [Line Items]
Long-term debt	607	627
Long term debt, fair value	675	658
2020-1 Series B, due through 2028
Debt Instrument [Line Items]
Long-term debt	161	170
Long term debt, fair value	215	223
Fixed rate enhanced equipment notes, due through 2023
Debt Instrument [Line Items]
Long-term debt	88	114
Long term debt, fair value	89	116
Fixed rate equipment notes, due through 2028
Debt Instrument [Line Items]
Long-term debt	675	891
Long term debt, fair value	680	1,017
Floating rate equipment notes, due through 2028
Debt Instrument [Line Items]
Long-term debt	115	152
Long term debt, fair value	111	144
Floating rate term loan credit facility, due through 2024
Debt Instrument [Line Items]
Long-term debt	0	702
Long term debt, fair value	0	759
Unsecured CARES Act Payroll Support Program loan, due through 2030
Debt Instrument [Line Items]
Long-term debt	259	259
Long term debt, fair value	224	207
Secured CARES Act Loan, due through 2025
Debt Instrument [Line Items]
Long-term debt	0	104
Long term debt, fair value	0	104
Citibank line of credit, due through 2023
Debt Instrument [Line Items]
Long-term debt	0	546
Long term debt, fair value	0	533
2020 sale-leaseback transactions, due through 2024
Debt Instrument [Line Items]
Long-term debt	348	352
Long term debt, fair value	382	393
Unsecured Consolidated Appropriations Act Payroll Support Program Extension loan, due through 2031
Debt Instrument [Line Items]
Long-term debt	144	0
Long term debt, fair value	$ 124	0
0.50% convertible senior notes due 2026
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	0.50%
Long-term debt	$ 735	0
Long term debt, fair value	680	0
Unsecured American Rescue Plan Act of 2021 Payroll Support loan, due through 2031
Debt Instrument [Line Items]
Long-term debt	132	0
Long term debt, fair value	$ 114	$ 0

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Contractual interest rate for funds borrowed, under the debt agreement.

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