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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, 2022 | Dec. 31, 2021
--- | --- | ---
Debt Instrument [Line Items] |  |
Present value of future minimum lease payment | $ 2 | $ 3
Carrying Value |  |
Debt Instrument [Line Items] |  |
Long-term debt | 3,645 | 4,003
Estimated Fair Value |  |
Debt Instrument [Line Items] |  |
Long-term debt, fair value | 2,848 | 3,982
Fixed rate specialty bonds, due through 2036 | Carrying Value |  |
Debt Instrument [Line Items] |  |
Long-term debt | 42 | 42
Fixed rate specialty bonds, due through 2036 | Estimated Fair Value |  |
Debt Instrument [Line Items] |  |
Long-term debt, fair value | 43 | 45
2019-1 Series AA, due through 2032 | Carrying Value |  |
Debt Instrument [Line Items] |  |
Long-term debt | 504 | 532
2019-1 Series AA, due through 2032 | Estimated Fair Value |  |
Debt Instrument [Line Items] |  |
Long-term debt, fair value | 345 | 442
2019-1 Series A, due through 2028 | Carrying Value |  |
Debt Instrument [Line Items] |  |
Long-term debt | 157 | 166
2019-1 Series A, due through 2028 | Estimated Fair Value |  |
Debt Instrument [Line Items] |  |
Long-term debt, fair value | 124 | 150
2019-1 Series B, due through 2027 | Carrying Value |  |
Debt Instrument [Line Items] |  |
Long-term debt | 82 | 94
2019-1 Series B, due through 2027 | Estimated Fair Value |  |
Debt Instrument [Line Items] |  |
Long-term debt, fair value | 87 | 121
2020-1 Series A, due through 2032 | Carrying Value |  |
Debt Instrument [Line Items] |  |
Long-term debt | 546 | 587
2020-1 Series A, due through 2032 | Estimated Fair Value |  |
Debt Instrument [Line Items] |  |
Long-term debt, fair value | 457 | 634
2020-1 Series B, due through 2028 | Carrying Value |  |
Debt Instrument [Line Items] |  |
Long-term debt | 135 | 153
2020-1 Series B, due through 2028 | Estimated Fair Value |  |
Debt Instrument [Line Items] |  |
Long-term debt, fair value | 142 | 199
Fixed rate enhanced equipment notes, due through 2023 | Carrying Value |  |
Debt Instrument [Line Items] |  |
Long-term debt | 61 | 88
Fixed rate enhanced equipment notes, due through 2023 | Estimated Fair Value |  |
Debt Instrument [Line Items] |  |
Long-term debt, fair value | 60 | 88
Fixed rate equipment notes, due through 2028 | Carrying Value |  |
Debt Instrument [Line Items] |  |
Long-term debt | 447 | 620
Fixed rate equipment notes, due through 2028 | Estimated Fair Value |  |
Debt Instrument [Line Items] |  |
Long-term debt, fair value | 422 | 706
Floating rate equipment notes, due through 2028 | Carrying Value |  |
Debt Instrument [Line Items] |  |
Long-term debt | 56 | 103
Floating rate equipment notes, due through 2028 | Estimated Fair Value |  |
Debt Instrument [Line Items] |  |
Long-term debt, fair value | 49 | 99
Unsecured CARES Act Payroll Support Program loan, due through 2030 | Carrying Value |  |
Debt Instrument [Line Items] |  |
Long-term debt | 259 | 259
Unsecured CARES Act Payroll Support Program loan, due through 2030 | Estimated Fair Value |  |
Debt Instrument [Line Items] |  |
Long-term debt, fair value | 126 | 219
2020 sale-leaseback transactions, due through 2024 | Carrying Value |  |
Debt Instrument [Line Items] |  |
Long-term debt | 341 | 347
2020 sale-leaseback transactions, due through 2024 | Estimated Fair Value |  |
Debt Instrument [Line Items] |  |
Long-term debt, fair value | 329 | 374
Unsecured Consolidated Appropriations Act Payroll Support Program Extension loan, due through 2031 | Carrying Value |  |
Debt Instrument [Line Items] |  |
Long-term debt | 144 | 144
Unsecured Consolidated Appropriations Act Payroll Support Program Extension loan, due through 2031 | Estimated Fair Value |  |
Debt Instrument [Line Items] |  |
Long-term debt, fair value | 68 | 121
Unsecured American Rescue Plan Act of 2021 Payroll Support loan, due through 2031 | Carrying Value |  |
Debt Instrument [Line Items] |  |
Long-term debt | 132 | 132
Unsecured American Rescue Plan Act of 2021 Payroll Support loan, due through 2031 | Estimated Fair Value |  |
Debt Instrument [Line Items] |  |
Long-term debt, fair value | 62 | 111
0.50% convertible senior notes, due through 2026 |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 750 | 750
Debt instrument, interest rate, stated percentage | 0.50% |
0.50% convertible senior notes, due through 2026 | Carrying Value |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 739 | 736
0.50% convertible senior notes, due through 2026 | Estimated Fair Value |  |
Debt Instrument [Line Items] |  |
Long-term debt, fair value | $ 534 | $ 673

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- Definition Present value of lessee's discounted obligation for lease payments from finance lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 6 -URI https://asc.fasb.org/extlink&oid=128292326&loc=SL77918701-209980 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=123391704&loc=SL77918627-209977 + Details
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