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The COVID-19 Pandemic Pandemic (Details) - USD ($) $ / shares in Units, $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Oct. 31, 2020 | Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Nov. 03, 2020 | Sep. 29, 2020 | Apr. 23, 2020
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |  |  |  |  |  |  |
Change in Revenue, Percent |  |  | (76.00%) |  |  |  |  |  |  |
Change in Capacity, Percent |  |  | (58.00%) |  |  |  |  |  |  |
Employee Related Cost Reductions, Salary Reduction, Officers |  |  |  |  |  | Implemented salary reductions of 20% to 50% for our officers through September 30, 2020, and 10% to 20% in the fourth quarter of 2020 |  |  |  |
Cash, Cash Equivalents, Short-Term Investments, and Short-Term Restricted Cash |  |  | $ 3,100.0 |  |  | $ 3,100.0 |  |  |  |
Cash, Cash Equivalents, and Short-Term Restricted Cash |  |  | 2,500.0 |  |  | 2,500.0 |  |  |  |
Loyalty points, pre-purchase arrangement |  |  |  |  |  | 150.0 |  |  |  |
Reduction in aircraft capital expenditures through 2022, relating to Airbus purchase agreement amendment | $ (2,000.0) |  |  |  |  |  |  |  |  |
Proceeds from Sale Leaseback Transactions | $ 59.0 |  | 327.0 | $ 118.0 |  | 445.0 |  |  |  |
Sale Leaseback, Cash Proceeds, Investing |  |  | 209.0 |  |  | 209.0 | $ 0.0 |  |  |
Sale and Leaseback Transaction, Gain (Loss), Net |  |  | (106.0) |  | $ 0.0 | (106.0) | 0.0 |  |  |
Special Items - Fleet Impairment |  |  | 56.0 |  | 0.0 | 258.0 | 0.0 |  |  |
CARES Act, Payroll Support Program, Total Payment |  |  | 27.0 | 936.0 |  | 963.0 |  |  |  |
CARES Act, Payroll Support Program, Grant |  |  | $ 19.0 | $ 685.0 |  | $ 704.0 |  |  |  |
Class of Warrant or Right, Outstanding |  |  | 85,540 |  |  | 85,540 |  |  | 1,200,000 | 2,600,000
Class of Warrant or Right, Exercise Price of Warrants or Rights |  |  | $ 9.50 |  |  | $ 9.50 |  |  | $ 9.50 |
Warrants and Rights Outstanding, Term |  |  |  |  |  |  |  |  |  | 5 years
Restricted Cash, Current |  |  | $ 74.0 |  | $ 0.0 | $ 74.0 | $ 0.0 |  |  |
Warrants and Rights Outstanding |  |  | 19.0 |  |  | 19.0 |  |  |  |
CARES Act, Payroll Support Program, Grant, Carrying Value |  |  | 49.0 |  |  | 49.0 |  |  |  |
CARES Act, Payroll Support Program, Grant, Carrying Value, Total |  |  | 685.0 |  |  | 685.0 |  |  |  |
CARES Act, Secured Loans, Eligibility Amount |  |  | $ 1,140.0 |  |  | $ 1,140.0 |  | $ 1,950.0 |  |
CARES Act, Class of Warrant or Right, Expected |  |  | 12,000,000.0 |  |  | 12,000,000.0 |  |  |  |
CARES Act, Payroll Tax Deferral |  |  |  |  |  | $ 36.0 |  |  |  |
CARES Act, Payroll Tax Deferral, Expected Liquidity, Remainder of Fiscal Year |  |  |  |  |  | $ 13.0 |  |  |  |
CARES Act, Federal Tax Benefit, Valuation Allowance |  |  | $ 10.0 |  |  |  |  |  |  |
Forecast [Member] |  |  |  |  |  |  |  |  |  |
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |  |  |  |  |  |  |
Change in Capacity, Percent |  | (45.00%) |  |  |  |  |  |  |  |

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