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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%)