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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 | 6 Months Ended |  |  |  |
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Sep. 15, 2021 USD ($) | Jun. 17, 2021 USD ($) | May 06, 2021 USD ($) $ / shares shares | Jan. 15, 2021 $ / shares shares | Jun. 17, 2020 USD ($) | Apr. 23, 2020 USD ($) $ / shares shares | Mar. 31, 2021 USD ($) trading_day | Jun. 30, 2022 USD ($) $ / shares | Jun. 30, 2021 USD ($) | May 16, 2022 USD ($) $ / shares | Mar. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) $ / shares | Sep. 29, 2020 USD ($) $ / shares shares
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Repayment of long-term debt and finance lease obligations |  |  |  |  |  |  |  | $ 189,000,000 | $ 1,481,000,000 |  |  |  |
Pledged assets not separately reported flight equipment |  |  |  |  |  |  |  | $ 6,500,000,000 |  |  |  |  |
Common stock, par value (in dollars per share) | $ / shares |  |  |  |  |  |  |  | $ 0.01 |  |  |  | $ 0.01 |
CARES act, payroll support program, total payment |  |  |  |  |  | $ 963,000,000 |  |  |  |  |  |  |
CARES act, payroll support program, grant |  |  |  |  |  | $ 704,000,000 |  |  |  |  |  |  |
Class of warrant or right, outstanding (in shares) | shares |  |  | 0.7 | 1.0 |  | 2.7 |  |  |  |  |  |  | 1.2
Class of warrant or right, exercise price of warrants or rights (in dollars per share) | $ / shares |  |  | $ 19.90 | $ 14.43 |  | $ 9.50 |  |  |  |  |  |  | $ 9.50
CARES act, secured loans, eligibility amount |  |  |  |  |  |  |  | $ 1,900,000,000 |  |  |  |  |
Warrants and rights outstanding, term |  |  |  |  |  |  |  |  |  |  |  |  | 5 years
Repayments of debt | $ 118,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Line of credit, current |  |  |  |  |  |  |  | 0 |  |  |  |  |
Interest expense, debt |  |  |  |  |  |  |  | 4,000,000 | 2,000,000 |  |  |  |
Amortization of debt issuance costs |  |  |  |  |  |  |  | 2,000,000 | 1,000,000 |  |  |  |
Spirit |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, par value (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  | $ 0.0001 |  |  |
Acquisition price (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  | $ 30.00 |  |  |
Payroll Support 2 Payments |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
CARES act, payroll support program, total payment |  |  |  |  |  |  |  | 580,000,000 |  |  |  |  |
CARES act, payroll support program, grant |  |  |  |  |  |  |  | 436,000,000 |  |  |  |  |
Payroll Support 3 Payments |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
CARES act, payroll support program, total payment |  |  | $ 541,000,000 |  |  |  |  |  |  |  |  |  |
CARES act, payroll support program, grant |  |  | $ 409,000,000 |  |  |  |  |  |  |  |  |  |
Morgan Stanley | Line of Credit |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  |  |  |  |  | 200,000,000 |  |  |  |  |
Morgan Stanley | Revolving Credit Facility and Letter of Credit Facility | Line of Credit |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term line of credit |  |  |  |  |  |  |  | 0 |  |  |  | $ 0 |
Senior Secured Bridge Facility | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  |  |  |  | $ 3,500,000,000 |  |  |
Senior Secured Bridge Facility | Goldman Sachs Bank USA, Bank of America, N.A. and BofA Securities, Inc | Spirit |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  |  |  |  | 3,500,000,000 |  |  |
Senior Secured Bridge Facility | Goldman Sachs Bank USA, Bank of America, N.A. and BofA Securities, Inc | Bridge Facility | Spirit |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  |  |  |  | $ 3,500,000,000 |  |  |
Unsecured Debt | US Department of Treasury |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  | $ 259,000,000 |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate |  |  | 1.00% |  |  | 1.00% |  |  |  |  |  |  |
Debt instrument, interest rate, stated percentage |  |  |  | 1.00% |  |  |  |  |  |  |  |  |
Unsecured Debt | US Department of Treasury | Payroll Support 2 Payments |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  |  | $ 144,000,000 |  |  |  |  |
Unsecured Debt | US Department of Treasury | Payroll Support 3 Payments |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  | $ 132,000,000 |  |  |  |  |  |  |  |  |  |
Unsecured Debt | US Department of Treasury | SOFR |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, term |  |  | 10 years | 10 years |  | 10 years |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate |  |  | 2.00% | 2.00% |  | 2.00% |  |  |  |  |  |  |
Convertible Senior Notes Due 2026 | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  |  |  |  |  | $ 750,000,000 |  |
Debt instrument, interest rate, stated percentage |  |  |  |  |  |  |  |  |  |  | 0.50% |  |
Proceeds from offering |  |  |  |  |  |  | $ 734,000,000 |  |  |  |  |  |
Debt instrument, convertible, conversion ratio |  |  |  |  |  |  | 0.0385802 |  |  |  |  |  |
Debt instrument, convertible, conversion price (in dollars per share) | $ / shares |  |  |  |  |  |  |  | $ 25.92 |  |  |  |  |
Convertible Senior Notes Due 2026 | Senior Notes | Debt Instrument, Redemption, Period One |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, redemption price, percentage |  |  |  |  |  |  | 100.00% |  |  |  |  |  |
Trading days | trading_day |  |  |  |  |  |  | 20 |  |  |  |  |  |
Convertible Senior Notes Due 2026 | Senior Notes | Debt Instrument, Redemption, Period Two |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, redemption price, percentage |  |  |  |  |  |  | 130.00% |  |  |  |  |  |
Trading days | trading_day |  |  |  |  |  |  | 30 |  |  |  |  |  |
Non Public Debt Secured CARES Act Loan due through 2025 | US Department of Treasury | Long-term Debt |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  |  |  |  |  |  |  | $ 115,000,000
Non Public Debt Floating Rate Term Loan Credit Facility | Line of Credit |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of debt |  | $ 722,000,000 |  |  |  |  |  |  |  |  |  |  |
Debt extinguishment expenses |  |  |  |  |  |  |  |  | $ 40,000,000 |  |  |  |
Non Public Debt Floating Rate Term Loan Credit Facility | Barclays Bank PLC | Line of Credit |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  | $ 750,000,000 |  |  |  |  |  |  |  |
Non Public Debt Floating Rate Term Loan Credit Facility | Barclays Bank PLC | Line of Credit | LIBOR |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate |  |  |  |  | 1.00% |  |  |  |  |  |  |  |
Non Public Debt Citibank Line of Credit due through 2023 | Citibank | Line of Credit |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit, current |  |  |  |  |  |  |  | $ 550,000,000 |  |  |  |  |

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- Definition The carrying amount, as of the date of the latest financial statement presented, of flight equipment which are owned but transferred to serve as collateral for the payment of the related debt obligation, primarily a secured borrowing or repurchase agreement, and for which the transferee is not permitted to sell or re-pledge them to an unrelated party. + References No definition available. + Details
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