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Long-term Debt, Short-term Borrowings, and Finance Lease Obligations - Net of Debt Acquisition Costs (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Long-term debt	$ 4,800	$ 2,245
Long-term debt, fair value	4,930	2,367
Fixed rate specialty bonds, due through 2036
Debt Instrument [Line Items]
Long-term debt	42	42
Long-term debt, fair value	45	46
2019-1 Series AA, due through 2032
Debt Instrument [Line Items]
Long-term debt	560	581
Long-term debt, fair value	440	586
2019-1 Series A, due through 2028
Debt Instrument [Line Items]
Long-term debt	174	181
Long-term debt, fair value	152	186
2019-1 Series B, due through 2027
Debt Instrument [Line Items]
Long-term debt	107	0
Long-term debt, fair value	139	0
2020-1 Series A, due through 2032
Debt Instrument [Line Items]
Long-term debt	627	0
Long-term debt, fair value	658	0
2020-1 Series B, due through 2028
Debt Instrument [Line Items]
Long-term debt	170	0
Long-term debt, fair value	223	0
Fixed rate enhanced equipment notes, due through 2023
Debt Instrument [Line Items]
Long-term debt	114	133
Long-term debt, fair value	116	141
Fixed rate equipment notes, due through 2028
Debt Instrument [Line Items]
Long-term debt	891	1,107
Long-term debt, fair value	1,017	1,201
Floating rate equipment notes, due through 2028
Debt Instrument [Line Items]
Long-term debt	152	201
Long-term debt, fair value	144	207
Floating rate term loan credit facility, due through 2024
Debt Instrument [Line Items]
Long-term debt	702	0
Long-term debt, fair value	759	0
Unsecured CARES Act Payroll Support Program loan, due through 2030
Debt Instrument [Line Items]
Long-term debt	259	0
Long-term debt, fair value	207	0
Secured CARES Act Loan, due through 2025
Debt Instrument [Line Items]
Long-term debt	104	0
Long-term debt, fair value	104	0
Citibank line of credit, due through 2023
Debt Instrument [Line Items]
Long-term debt	546	0
Long-term debt, fair value	533	0
2020 sale-leaseback transactions, due through 2024
Debt Instrument [Line Items]
Long-term debt	352	0
Long-term debt, fair value	$ 393	$ 0

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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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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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