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Debt - Narrative (Details)
Apr. 20, 2020
USD ($)
Apr. 07, 2020
USD ($)
Mar. 20, 2020
USD ($)
Mar. 09, 2020
USD ($)
Mar. 31, 2020
USD ($)
Subsequent Event          
Debt Instrument [Line Items]          
Total funding provided under the Payroll Support Program $ 5,000,000,000.0        
Used Aircraft Facility | Secured Debt          
Debt Instrument [Line Items]          
Face amount       $ 2,000,000,000  
Interest rate floor       1.00%  
Minimum required unrestricted cash and cash equivalents and unused commitments available       $ 2,000,000,000.0  
Minimum required ratio of appraised value of collateral to the outstanding obligations       1.60  
Used Aircraft Facility | Before 180 Days | Secured Debt | LIBOR          
Debt Instrument [Line Items]          
Percent spread on variable rate       2.00%  
Used Aircraft Facility | Before 180 Days | Secured Debt | Alternative Rate          
Debt Instrument [Line Items]          
Percent spread on variable rate       1.00%  
Used Aircraft Facility | 180-270 Days | Secured Debt | LIBOR          
Debt Instrument [Line Items]          
Percent spread on variable rate       2.25%  
Used Aircraft Facility | 180-270 Days | Secured Debt | Alternative Rate          
Debt Instrument [Line Items]          
Percent spread on variable rate       1.25%  
Used Aircraft Facility | 270 Days and Longer | Secured Debt | LIBOR          
Debt Instrument [Line Items]          
Percent spread on variable rate       2.50%  
Used Aircraft Facility | 270 Days and Longer | Secured Debt | Alternative Rate          
Debt Instrument [Line Items]          
Percent spread on variable rate       1.50%  
Spare Parts Facility | Secured Debt          
Debt Instrument [Line Items]          
Face amount     $ 500,000,000    
Interest rate floor     1.00%    
Minimum required unrestricted cash and cash equivalents and unused commitments available     $ 2,000,000,000.0    
Minimum required ratio of appraised value of collateral to the outstanding obligations     1.80    
Minimum required ratio of appraised value of collateral to the outstanding obligations if certain spare parts are used     2.00    
Spare Parts Facility | 90-180 Days | Secured Debt | LIBOR          
Debt Instrument [Line Items]          
Percent spread on variable rate     2.75%    
Spare Parts Facility | 90-180 Days | Secured Debt | Alternative Rate          
Debt Instrument [Line Items]          
Percent spread on variable rate     1.75%    
Spare Parts Facility | Before 90 Days | Secured Debt | LIBOR          
Debt Instrument [Line Items]          
Percent spread on variable rate     3.00%    
Spare Parts Facility | Before 90 Days | Secured Debt | Alternative Rate          
Debt Instrument [Line Items]          
Percent spread on variable rate     2.00%    
Spare Parts Facility | 180-270 Days | Secured Debt | LIBOR          
Debt Instrument [Line Items]          
Percent spread on variable rate     3.25%    
Spare Parts Facility | 180-270 Days | Secured Debt | Alternative Rate          
Debt Instrument [Line Items]          
Percent spread on variable rate     2.25%    
Spare Parts Facility | 270 Days and Longer | Secured Debt | LIBOR          
Debt Instrument [Line Items]          
Percent spread on variable rate     3.50%    
Spare Parts Facility | 270 Days and Longer | Secured Debt | Alternative Rate          
Debt Instrument [Line Items]          
Percent spread on variable rate     2.50%    
Spare Engines Facility | Secured Debt | Subsequent Event          
Debt Instrument [Line Items]          
Face amount   $ 250,000,000      
Interest rate floor   1.00%      
Minimum required unrestricted cash and cash equivalents and unused commitments available   $ 2,000,000,000.0      
Minimum required ratio of appraised value of collateral to the outstanding obligations   1.40      
Spare Engines Facility | Before 180 Days | Secured Debt | LIBOR | Subsequent Event          
Debt Instrument [Line Items]          
Percent spread on variable rate   3.00%      
Spare Engines Facility | Before 180 Days | Secured Debt | Alternative Rate | Subsequent Event          
Debt Instrument [Line Items]          
Percent spread on variable rate   2.00%      
Spare Engines Facility | 180-270 Days | Secured Debt | LIBOR | Subsequent Event          
Debt Instrument [Line Items]          
Percent spread on variable rate   3.25%      
Spare Engines Facility | 180-270 Days | Secured Debt | Alternative Rate | Subsequent Event          
Debt Instrument [Line Items]          
Percent spread on variable rate   2.25%      
Spare Engines Facility | 270 Days and Longer | Secured Debt | LIBOR | Subsequent Event          
Debt Instrument [Line Items]          
Percent spread on variable rate   3.50%      
Spare Engines Facility | 270 Days and Longer | Secured Debt | Alternative Rate | Subsequent Event          
Debt Instrument [Line Items]          
Percent spread on variable rate   2.50%      
PSP Note | Unsecured Debt | Subsequent Event          
Debt Instrument [Line Items]          
Face amount $ 714,000,000.0        
Percent increase in the principal amount based on any disbursement made by the U.S. Treasury Department 30.00%        
Aggregate principal amount after all disbursements $ 1,500,000,000        
Term of debt 10 years        
PSP Note | Years 1 through 5 | Unsecured Debt | Subsequent Event          
Debt Instrument [Line Items]          
Stated interest rate 1.00%        
PSP Note | Years 6 through 10 | Unsecured Debt | SOFR | Subsequent Event          
Debt Instrument [Line Items]          
Percent spread on variable rate 2.00%        
Revolving Credit Facility | United Airlines, Inc. | Secured Debt          
Debt Instrument [Line Items]          
Available under revolving credit facility         $ 2,000,000,000.0