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Long-term Debt, Short-term Borrowings, and Finance Lease Obligations - Finance Lease Obligations And The Related Weighted Average Interest Rate (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Present value of future minimum lease payment	$ 63	$ 89
Finance leases	4.60%	4.75%
Total debt and capital lease obligations	$ 4,907	$ 2,352
Less: Current maturities	(450)	(344)
Less: Debt acquisition cost	(44)	(18)
Long-term debt and finance lease obligations	4,413	1,990
Fixed rate specialty bonds, due through 2036
Debt Instrument [Line Items]
Secured debt	$ 43	$ 43
Weighted average interest rate	4.90%	4.90%
2019-1 Series AA, due through 2032
Debt Instrument [Line Items]
Secured debt	$ 567	$ 589
Weighted average interest rate	2.80%	2.80%
2019-1 Series A, due through 2028
Debt Instrument [Line Items]
Secured debt	$ 176	$ 183
Weighted average interest rate	3.00%	3.00%
2019-1 Series B, due through 2027
Debt Instrument [Line Items]
Secured debt	$ 109	$ 0
Weighted average interest rate	8.20%	0.00%
2020-1 Series A, due through 2032
Debt Instrument [Line Items]
Secured debt	$ 635	$ 0
Weighted average interest rate	4.10%	0.00%
2020-1 Series B, due through 2028
Debt Instrument [Line Items]
Secured debt	$ 172	$ 0
Weighted average interest rate	7.80%	0.00%
Fixed rate enhanced equipment notes, due through 2023
Debt Instrument [Line Items]
Secured debt	$ 115	$ 134
Weighted average interest rate	4.50%	4.50%
Fixed rate equipment notes, due through 2028
Debt Instrument [Line Items]
Secured debt	$ 895	$ 1,113
Weighted average interest rate	4.20%	4.20%
Floating rate equipment notes, due through 2028
Debt Instrument [Line Items]
Secured debt	$ 153	$ 201
Weighted average interest rate	2.60%	4.30%
Floating rate term loan credit facility, due through 2024
Debt Instrument [Line Items]
Secured debt	$ 712	$ 0
Weighted average interest rate	6.40%	0.00%
Secured CARES Act Loan, due through 2025
Debt Instrument [Line Items]
Secured debt	$ 106	$ 0
Weighted average interest rate	3.20%	0.00%
Citibank line of credit, due through 2023
Debt Instrument [Line Items]
Secured debt	$ 550	$ 0
Weighted average interest rate	2.20%	0.00%
2020 sale-leaseback transactions, due through 2024
Debt Instrument [Line Items]
Secured debt		$ 0
Weighted average interest rate	7.60%	0.00%
Unsecured debt	$ 352
Unsecured CARES Act Payroll Support Program loan, due through 2030
Debt Instrument [Line Items]
Weighted average interest rate	2.00%	0.00%
Unsecured debt	$ 259	$ 0

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Debt Acquisition Cost

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Amount of short-term and long-term debt and lease obligation.

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

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