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Combined Notes to the Financial Statements (Unaudited) (Details)
3 Months Ended 9 Months Ended
Apr. 29, 2021
USD ($)
Jan. 15, 2021
USD ($)
Dec. 31, 2021
Sep. 30, 2021
USD ($)
Mar. 31, 2021
employee
Sep. 30, 2021
USD ($)
employee
Sep. 30, 2020
USD ($)
Apr. 21, 2021
USD ($)
Unusual or Infrequent Item, or Both [Line Items]                
Percent of capacity cut       28.00%        
Proceeds from issuance of debt, net of discounts and fees           $ 11,098,000,000 $ 12,730,000,000  
Proceeds from the issuance of common stock           500,000,000    
Forecast                
Unusual or Infrequent Item, or Both [Line Items]                
Percent of capacity cut     23.00%          
United Airlines, Inc.                
Unusual or Infrequent Item, or Both [Line Items]                
Proceeds from issuance of debt, net of discounts and fees           $ 11,098,000,000 $ 12,730,000,000  
PSP2                
Unusual or Infrequent Item, or Both [Line Items]                
Total funding provided under the Payroll Support Program   $ 3,000,000,000            
Funding provided through direct grants under the Payroll Support Program   2,100,000,000            
PSP3                
Unusual or Infrequent Item, or Both [Line Items]                
Total funding provided under the Payroll Support Program $ 2,800,000,000              
Funding provided through direct grants under the Payroll Support Program 2,000,000,000              
Voluntary Separation Leave Programs | Employee Separation                
Unusual or Infrequent Item, or Both [Line Items]                
Number of employees electing to voluntarily separate from the company | employee         4,500 4,500    
Secured Debt | 2026 Notes and 2029 Notes                
Unusual or Infrequent Item, or Both [Line Items]                
Face amount       $ 4,000,000,000   $ 4,000,000,000   $ 4,000,000,000
Secured Debt | 2026 Notes                
Unusual or Infrequent Item, or Both [Line Items]                
Face amount       $ 2,000,000,000   $ 2,000,000,000   $ 2,000,000,000
Stated interest rate       4.375%   4.375%   4.375%
Secured Debt | 2029 Notes                
Unusual or Infrequent Item, or Both [Line Items]                
Face amount       $ 2,000,000,000   $ 2,000,000,000   $ 2,000,000,000
Stated interest rate       4.625%   4.625%   4.625%
Secured Debt | Term Loan B Facility due 2028                
Unusual or Infrequent Item, or Both [Line Items]                
Face amount       $ 5,000,000,000   $ 5,000,000,000   $ 5,000,000,000
Secured Debt | Senior Secured Revolving Credit Facility due 2025 | Revolving Credit Facility                
Unusual or Infrequent Item, or Both [Line Items]                
Maximum borrowing capacity       1,750,000,000   1,750,000,000   1,750,000,000
Secured Debt | Term Loan Facility                
Unusual or Infrequent Item, or Both [Line Items]                
Face amount       1,400,000,000   1,400,000,000   1,400,000,000
Secured Debt | Credit Agreement | Revolving Credit Facility                
Unusual or Infrequent Item, or Both [Line Items]                
Face amount       1,000,000,000   1,000,000,000   1,000,000,000
Secured Debt | CARES Act Term Loan Facility                
Unusual or Infrequent Item, or Both [Line Items]                
Face amount       520,000,000   520,000,000   $ 520,000,000
Pass-Through Certificates | Class A Pass-Through Certificates Issued February 2021 | United Airlines, Inc.                
Unusual or Infrequent Item, or Both [Line Items]                
Face amount       $ 600,000,000   $ 600,000,000    
Stated interest rate       4.88%   4.88%    
Proceeds from issuance of debt, net of discounts and fees           $ 600,000,000    
Unsecured Debt | PSP2 Note                
Unusual or Infrequent Item, or Both [Line Items]                
Face amount       $ 870,000,000   $ 870,000,000    
Term of debt           10 years    
Unsecured Debt | PSP2 Note | PSP2                
Unusual or Infrequent Item, or Both [Line Items]                
Funding provided through loans under the Payroll Support Program   $ 870,000,000            
Term of debt   10 years            
Unsecured Debt | PSP3 Note                
Unusual or Infrequent Item, or Both [Line Items]                
Face amount       $ 810,000,000   $ 810,000,000    
Term of debt           10 years    
Unsecured Debt | PSP3 Note | PSP3                
Unusual or Infrequent Item, or Both [Line Items]                
Funding provided through loans under the Payroll Support Program $ 810,000,000              
Term of debt 10 years