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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