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Long-term Debt, Short-term Borrowings and Finance Lease Obligations - Narrative (Details) - USD ($) |  | 3 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Oct. 21, 2022 | Mar. 31, 2024 | Mar. 31, 2023 | Mar. 02, 2024 | Dec. 31, 2023 | May 16, 2022
Line of Credit Facility [Line Items] |  |  |  |  |  |
Reduction in outstanding debt and capital lease obligations |  | $ 58,000,000 | $ 109,000,000 |  |  |
Pledged assets not separately reported flight equipment |  | 6,400,000,000 |  |  |  |
Finance lease, liability |  | 20,000,000 |  |  | $ 0 |
Proceeds from sale-leaseback transactions |  | 332,000,000 | $ 38,000,000 |  |  |
Morgan Stanley | Line of Credit |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  | 200,000,000 |  |  |  |
Short-term debt |  | 0 |  |  | 0 |
Second Amended And Restated Agreement | Citibank | Line of Credit |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity | $ 600,000,000 |  |  |  |  |
Debt instrument, basis spread on variable rate (in percent) | 1.00% |  |  |  |  |
Debt instrument, basis spread on variable rate, floor (in percent) | 0.00% |  |  |  |  |
Long-term line of credit |  | $ 0 |  |  | $ 0 |
Second Amended And Restated Agreement | Citibank | Line of Credit | SOFR |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Debt instrument, basis spread on variable rate (in percent) | 2.00% |  |  |  |  |
Senior Secured Bridge Facility | Senior Notes |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Long-term line of credit |  |  |  | $ 0 |  |
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

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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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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -SubTopic 10 -Topic 210 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)(a)(2)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479440/944-210-S99-1 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 + Details
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