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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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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=120520924&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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