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Debt - Narrative (Details)
3 Months Ended 6 Months Ended
Jul. 02, 2020
USD ($)
Jun. 30, 2020
USD ($)
Apr. 20, 2020
USD ($)
Apr. 07, 2020
USD ($)
Mar. 20, 2020
USD ($)
Mar. 09, 2020
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Debt Instrument [Line Items]                  
Proceeds from issuance of long-term debt               $ 1,669,000,000 $ 996,000,000
Total funding provided under the Payroll Support Program   $ 5,000,000,000.0 $ 5,000,000,000.0       $ 5,000,000,000.0 5,000,000,000.0  
Used Aircraft Facility | Secured Debt                  
Debt Instrument [Line Items]                  
Face amount           $ 2,000,000,000      
Variable 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        
Variable 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                  
Debt Instrument [Line Items]                  
Face amount       $ 250,000,000          
Variable 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                  
Debt Instrument [Line Items]                  
Percent spread on variable rate       3.00%          
Spare Engines Facility | Before 180 Days | Secured Debt | Alternative Rate                  
Debt Instrument [Line Items]                  
Percent spread on variable rate       2.00%          
Spare Engines Facility | 180-270 Days | Secured Debt | LIBOR                  
Debt Instrument [Line Items]                  
Percent spread on variable rate       3.25%          
Spare Engines Facility | 180-270 Days | Secured Debt | Alternative Rate                  
Debt Instrument [Line Items]                  
Percent spread on variable rate       2.25%          
Spare Engines Facility | 270 Days and Longer | Secured Debt | LIBOR                  
Debt Instrument [Line Items]                  
Percent spread on variable rate       3.50%          
Spare Engines Facility | 270 Days and Longer | Secured Debt | Alternative Rate                  
Debt Instrument [Line Items]                  
Percent spread on variable rate       2.50%          
PSP Note | Secured Debt                  
Debt Instrument [Line Items]                  
Face amount   $ 1,300,000,000         $ 1,300,000,000 $ 1,300,000,000  
PSP Note | Unsecured Debt                  
Debt Instrument [Line Items]                  
Percent increase in the principal amount based on any disbursement made by the U.S. Treasury Department   30.00%         30.00% 30.00%  
Aggregate principal amount after all disbursements   $ 1,500,000,000         $ 1,500,000,000 $ 1,500,000,000  
Term of debt     10 years       10 years    
PSP Note | Years 1 through 5 | Unsecured Debt                  
Debt Instrument [Line Items]                  
Stated interest rate   1.00%         1.00% 1.00%  
PSP Note | Years 6 through 10 | Unsecured Debt | SOFR                  
Debt Instrument [Line Items]                  
Percent spread on variable rate             2.00%    
6.50% Senior Secured Notes due 2027 | Secured Debt | Subsequent Event                  
Debt Instrument [Line Items]                  
Face amount $ 3,800,000,000                
Stated interest rate 6.50%                
Term Loan Facility | Line of Credit | Subsequent Event                  
Debt Instrument [Line Items]                  
Proceeds from issuance of long-term debt $ 3,000,000,000.0                
Face amount $ 3,000,000,000.0                
Term Loan Facility | Line of Credit | LIBOR | Subsequent Event                  
Debt Instrument [Line Items]                  
Variable rate floor 1.00%                
Percent spread on variable rate 5.25%                
Bridge Loan | Bridge Loan                  
Debt Instrument [Line Items]                  
Face amount   $ 200,000,000         $ 200,000,000 $ 200,000,000  
Bridge Loan | Bridge Loan | LIBOR                  
Debt Instrument [Line Items]                  
Variable rate floor   1.00%              
Percent spread on variable rate   1.75%              
Bridge Loan | Bridge Loan | Alternative Rate                  
Debt Instrument [Line Items]                  
Percent spread on variable rate   0.75%              
United Airlines, Inc.                  
Debt Instrument [Line Items]                  
Proceeds from issuance of long-term debt               $ 1,669,000,000 $ 996,000,000
Revolving Credit Facility | United Airlines, Inc. | Secured Debt | Subsequent Event                  
Debt Instrument [Line Items]                  
Amount available under credit facility $ 2,000,000,000.0                
Available under revolving credit facility 1,000,000,000.0                
Revolving Credit Facility | United Airlines, Inc. | Secured Debt | LIBOR | Subsequent Event                  
Debt Instrument [Line Items]                  
Proceeds from lines of credit $ 1,000,000,000.0                
Variable rate floor 0.00%                
Percent spread on variable rate 2.25%                
Revolving Credit Facility | United Airlines, Inc. | Secured Debt | Alternative Rate | Subsequent Event                  
Debt Instrument [Line Items]                  
Percent spread on variable rate 1.25%