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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, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Long-term debt	$ 5,026	$ 4,800
Long term debt, fair value	4,983	4,930
Finance lease, liability	56	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	560	560
Long term debt, fair value	456	440
2019-1 Series A, due through 2028
Debt Instrument [Line Items]
Long-term debt	175	174
Long term debt, fair value	155	152
2019-1 Series B, due through 2027
Debt Instrument [Line Items]
Long-term debt	107	107
Long term debt, fair value	140	139
2020-1 Series A, due through 2032
Debt Instrument [Line Items]
Long-term debt	627	627
Long term debt, fair value	676	658
2020-1 Series B, due through 2028
Debt Instrument [Line Items]
Long-term debt	170	170
Long term debt, fair value	226	223
Fixed rate enhanced equipment notes, due through 2023
Debt Instrument [Line Items]
Long-term debt	100	114
Long term debt, fair value	101	116
Fixed rate equipment notes, due through 2028
Debt Instrument [Line Items]
Long-term debt	841	891
Long term debt, fair value	829	1,017
Floating rate equipment notes, due through 2028
Debt Instrument [Line Items]
Long-term debt	140	152
Long term debt, fair value	133	144
Floating rate term loan credit facility, due through 2024
Debt Instrument [Line Items]
Long-term debt	695	702
Long term debt, fair value	754	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	214	207
Secured CARES Act Loan, due through 2025
Debt Instrument [Line Items]
Long-term debt	104	104
Long term debt, fair value	106	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	351	352
Long term debt, fair value	388	393
Unsecured Consolidated Appropriations Act Payroll Support Program Extension loan, due through 2031
Debt Instrument [Line Items]
Long-term debt	121	0
Long term debt, fair value	$ 100	0
0.50% convertible senior notes due 2026
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	0.50%
Long-term debt	$ 734	0
Long term debt, fair value	$ 659	$ 0

X

- Definition

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

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- Definition

Present value of lessee's discounted obligation for lease payments from finance lease.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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