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The COVID-19 Pandemic Pandemic (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 1 Months Ended 3 Months Ended 6 Months Ended
Jul. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Apr. 23, 2020
Unusual or Infrequent Item, or Both [Line Items]                
Change in Revenue, Percent     (90.00%)          
Change in Capacity, Percent     (85.00%)          
Parked Fleet, Temporary, Percent     30.00%     30.00%    
Employee Related Cost Reductions, Percentage, Salary Reduction, Officers           (20.00%)    
Employee Related Cost Reductions, Percentage, Salary Reduction, Officers - Upper Range           (50.00%)    
Cash, Cash Equivalents, Short-Term Investments, and Short-Term Restricted Cash     $ 3,400.0     $ 3,400.0    
Loyalty points, pre-purchase arrangement           150.0    
Reduction in aircraft capital expenditures through 2022, relating to Airbus purchase agreement amendment           (1,100.0)    
Cash, Cash Equivalents, and Short-Term Restricted Cash     3,100.0     3,100.0    
Proceeds from Sale Leaseback Transactions $ 267.0         118.0 $ 0.0  
Special Items - Fleet Impairment     0.0 $ 202.0 $ 0.0 202.0 $ 0.0  
CARES Act, Payroll Support Program, Total Payment               $ 936.0
CARES Act, Payroll Support Program, Grant     667.0     667.0   $ 685.0
Restricted Cash, Current     533.0     533.0    
Warrants and Rights Outstanding     18.0     18.0    
Class of Warrant or Right, Outstanding               2.6
Class of Warrant or Right, Exercise Price of Warrants or Rights               $ 9.50
Warrants and Rights Outstanding, Term               5 years
CARES Act, Secured Loans, Expected Eligibility Amount     $ 1,100.0     $ 1,100.0    
CARES Act, Class of Warrant or Right, Expected     12.0     12.0    
CARES Act, Payroll Tax Deferral           $ 20.0    
CARES Act, Payroll Tax Deferral, Expected Liquidity, Remainder of Fiscal Year           31.0    
CARES Act, Federal Tax Benefit, Foreign Tax Credit Valuation Allowance           10.0    
CARES Act, Federal Tax Benefit, NOL Carryback           $ 35.0    
Forecast [Member]                
Unusual or Infrequent Item, or Both [Line Items]                
Change in Capacity, Percent   (45.00%)