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Long-term Debt, Short-term Borrowings and Finance Lease Obligations - Narrative (Details) $ / shares in Units, shares in Millions |  |  |  |  | 1 Months Ended | 12 Months Ended |  |  |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 21, 2022 USD ($) | May 06, 2021 USD ($) $ / shares shares | Jan. 15, 2021 USD ($) $ / shares shares | Apr. 23, 2020 USD ($) $ / shares shares | Mar. 31, 2021 USD ($) day | Dec. 31, 2022 USD ($) aircraft $ / shares | Dec. 31, 2021 USD ($) $ / shares | Dec. 31, 2020 USD ($) | Jul. 28, 2022 $ / shares | May 16, 2022 USD ($) $ / shares | Mar. 31, 2022 USD ($) $ / shares | Sep. 29, 2020 | Aug. 31, 2020 USD ($) aircraft | Dec. 31, 2019 USD ($) aircraft | Nov. 30, 2019 USD ($) aircraft | Dec. 31, 2018 USD ($) aircraft | Mar. 30, 2014 USD ($) aircraft | Apr. 30, 2013 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
CARES act, payroll support program, total payment |  |  |  | $ 963,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
CARES act, payroll support program, grant |  |  |  | $ 704,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument term |  |  |  | 10 years |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of warrant or right, outstanding (in shares) | shares |  |  |  | 2.7 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of warrant or right, exercise price of warrants or rights (in dollars per share) | $ / shares |  |  |  | $ 9.50 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants and rights outstanding, term |  |  |  |  |  |  |  |  |  |  |  | 5 years |  |  |  |  |  |
Proceeds from sale leaseback transactions |  |  |  |  |  |  |  | $ 563,000,000 |  |  |  |  |  |  |  |  |  |
Proceeds from sale-leaseback transactions |  |  |  |  |  | $ 0 | $ 0 | 354,000,000 |  |  |  |  |  |  |  |  |  |
Proceeds from sale-leaseback transactions |  |  |  |  |  | 0 | 0 | 209,000,000 |  |  |  |  |  |  |  |  |  |
Losses on sale-leaseback transactions |  |  |  |  |  | 0 | 0 | 106,000,000 |  |  |  |  |  |  |  |  |  |
Finance lease assets |  |  |  |  |  | 2,000,000 | 3,000,000 |  |  |  |  |  |  |  |  |  |  |
Finance lease, right-of-use asset, accumulated amortization |  |  |  |  |  |  | 1,000,000 | 1,000,000 |  |  |  |  |  |  |  |  |  |
2023 |  |  |  |  |  | 2,000,000 |  |  |  |  |  |  |  |  |  |  |  |
2022 |  |  |  |  |  |  | 1,000,000 |  |  |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  | 7,000,000 | 6,000,000 |  |  |  |  |  |  |  |  |  |  |
Debt issuance costs amortization |  |  |  |  |  | 3,000,000 | 3,000,000 |  |  |  |  |  |  |  |  |  |  |
Debt extinguishment expense |  |  |  |  |  |  | 50,000,000 |  |  |  |  |  |  |  |  |  |  |
Pledged assets not separately reported flight equipment |  |  |  |  |  | 6,200,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Interest paid, including capitalized interest, operating and investing activities |  |  |  |  |  | $ 124,000,000 | $ 180,000,000 | 139,000,000 |  |  |  |  |  |  |  |  |  |
Common stock, par value (in dollars per share) | $ / shares |  |  |  |  |  | $ 0.01 | $ 0.01 |  |  |  |  |  |  |  |  |  |  |
Spirit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, par value (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  | $ 0.0001 | $ 0.0001 |  |  |  |  |  |  |  |
Acquisition price (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  | $ 33.50 | $ 30.00 |  |  |  |  |  |  |  |
Morgan Stanley |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, current borrowing capacity |  |  |  |  |  | $ 200,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Payroll Support 2 Payments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
CARES act, payroll support program, grant |  |  | $ 436,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument term |  |  | 10 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of warrant or right, outstanding (in shares) | shares |  | 0.7 | 1.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of warrant or right, exercise price of warrants or rights (in dollars per share) | $ / shares |  | $ 19.90 | $ 14.43 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
CARES Act, Payroll Support Program 2, Total Payment |  |  | $ 580,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payroll Support 3 Payments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
CARES act, payroll support program, total payment |  | $ 541,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
CARES act, payroll support program, grant |  | $ 409,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument term |  | 10 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Computer Equipment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finance lease assets |  |  |  |  |  |  | $ 3,000,000 | $ 4,000,000 |  |  |  |  |  |  |  |  |  |
2023 |  |  |  |  |  | 2,000,000 | 2,000,000 |  |  |  |  |  |  |  |  |  |  |
Line of Credit | Revolving Credit Facility and Letter of Credit Facility | Morgan Stanley |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term line of credit |  |  |  |  |  | 0 | $ 0 |  |  |  |  |  |  |  |  |  |  |
Fixed rate specialty bonds, due through 2036 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 42,000,000
Debt instrument, net amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 43,000,000
Debt instrument, unamortized premium |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,000,000
Fixed rate enhanced equipment notes, 2020-1A and B | Long-term Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  |  |  |  |  |  |  | $ 808,000,000 |  | $ 772,000,000 |  |  |
2019-1 Series B, due through 2027 | Long-term Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  |  |  |  |  |  |  | $ 115,000,000 |  |  |  |  |
Debt instrument, interest rate, stated percentage |  |  |  |  |  |  |  |  |  |  |  |  | 8.00% |  |  |  |  |
2019-1 Series B, due through 2027 | Long-term Debt | Airbus A321 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of aircraft, secured debt transactions | aircraft |  |  |  |  |  |  |  |  |  |  |  |  | 24 |  | 25 |  |  |
2020-1 Series A, due through 2032 | Long-term Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  |  |  |  |  |  |  | $ 636,000,000 |  | $ 589,000,000 |  |  |
Debt instrument, interest rate, stated percentage |  |  |  |  |  |  |  |  |  |  |  |  | 4.00% |  | 2.75% |  |  |
2020-1 Series B, due through 2028 | Long-term Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  |  |  |  |  |  |  | $ 172,000,000 |  | $ 183,000,000 |  |  |
Debt instrument, interest rate, stated percentage |  |  |  |  |  |  |  |  |  |  |  |  | 7.75% |  | 2.95% |  |  |
Fixed rate enhanced equipment notes, due through 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 226,000,000 |
Fixed rate enhanced equipment notes, due through 2023 | Secured Debt | A-320-200 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of new aircraft held as security | aircraft |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 14 |
Fixed rate equipment notes, due through 2028 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  | $ 11,000,000 |  |  |  |  |  |  |  | $ 219,000,000 |  | $ 567,000,000 |  |
Fixed rate equipment notes, due through 2028 | Secured Debt | A-320 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of new aircraft held as security | aircraft |  |  |  |  |  |  |  |  |  |  |  |  |  | 10 |  | 14 |  |
Fixed rate equipment notes, due through 2028 | Secured Debt | A-321 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of new aircraft held as security | aircraft |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  | 10 |  |
Fixed rate equipment notes, due through 2028 | Secured Debt | E190 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of aircraft, secured debt transactions | aircraft |  |  |  |  |  | 5 |  |  |  |  |  |  |  |  |  |  |  |
Floating rate equipment notes, due through 2028 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 120,000,000 |  |
Floating rate equipment notes, due through 2028 | Secured Debt | A-320 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of new aircraft held as security | aircraft |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6 |  |
Floating rate equipment notes, due through 2028 | Secured Debt | A-321 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of new aircraft held as security | aircraft |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  |
Unsecured Debt | US Department of Treasury |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  | $ 259,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate, stated percentage |  |  |  | 1.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unsecured Debt | US Department of Treasury | Payroll Support 2 Payments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  | $ 144,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate, stated percentage |  |  | 1.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unsecured Debt | US Department of Treasury | Payroll Support 3 Payments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  | $ 132,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate, stated percentage |  | 1.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unsecured Debt | US Department of Treasury | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate |  |  |  | 2.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unsecured Debt | US Department of Treasury | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Payroll Support 2 Payments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate |  |  | 2.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unsecured Debt | US Department of Treasury | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Payroll Support 3 Payments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate |  | 2.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Senior Notes Due 2026 | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  | $ 750,000,000 |  |  |  |  |  | $ 750,000,000 |  |  |  |  |  |  |
Debt instrument, interest rate, stated percentage |  |  |  |  | 0.50% | 0.50% |  |  |  |  | 0.50% |  |  |  |  |  |  |
Proceeds from offering |  |  |  |  | $ 734,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, convertible ratio (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  | $ 25.92 |  |  |  |  |  |  |
Debt instrument, conversion ratio |  |  |  |  | 0.0385802 |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Senior Notes Due 2026 | Senior Notes | Debt Instrument, Redemption, Period One |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, redemption price, percentage |  |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Trading days | day |  |  |  |  | 20 |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Senior Notes Due 2026 | Senior Notes | Debt Instrument, Redemption, Period Two |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, redemption price, percentage |  |  |  |  | 130.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Trading days | day |  |  |  |  | 30 |  |  |  |  |  |  |  |  |  |  |  |  |
Second Amended And Restated Agreement | Line of Credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate | 1.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, current borrowing capacity | $ 550,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase in lending commitments | 50,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity | $ 600,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Variable rate | 0.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Second Amended And Restated Agreement | Line of Credit | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate | 2.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior Secured Bridge Facility | Goldman Sachs Bank USA, Bank of America, N.A. and BofA Securities, Inc | Spirit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  |  |  |  | $ 3,500,000,000 |  |  |  |  |  |  |  |
Senior Secured Bridge Facility | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  |  |  |  | 3,500,000,000 |  |  |  |  |  |  |  |
Senior Secured Bridge Facility | Bridge Facility | Goldman Sachs Bank USA, Bank of America, N.A. and BofA Securities, Inc | Spirit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  |  |  |  | $ 3,500,000,000 |  |  |  |  |  |  |  |

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- Definition Debt Instrument, Net Amount + References No definition available. + Details
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