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Debt - Details of Pass Through Trusts (Details) - USD ($)
9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Debt Instrument [Line Items]    
Proceeds received from issuance of debt $ 1,109,000,000 $ 1,241,000,000 [1]
United Airlines, Inc.    
Debt Instrument [Line Items]    
Proceeds received from issuance of debt 1,109,000,000 $ 1,241,000,000 [2]
Pass-Through Certificates | United Airlines, Inc.    
Debt Instrument [Line Items]    
Face Amount 2,234,000,000  
Proceeds received from issuance of debt 1,052,000,000  
Remaining proceeds from issuance of certificates to be received in future periods 1,182,000,000  
Pass-Through Certificates | Class AA Pass-Through Certificates Issued September 2019 | United Airlines, Inc.    
Debt Instrument [Line Items]    
Face Amount $ 702,000,000  
Stated interest rate 2.70%  
Total debt recorded $ 76,000,000  
Proceeds received from issuance of debt 76,000,000  
Remaining proceeds from issuance of certificates to be received in future periods 626,000,000  
Pass-Through Certificates | Class A Pass-Through Certificates Issued September 2019 | United Airlines, Inc.    
Debt Instrument [Line Items]    
Face Amount $ 287,000,000  
Stated interest rate 2.90%  
Total debt recorded $ 31,000,000  
Proceeds received from issuance of debt 31,000,000  
Remaining proceeds from issuance of certificates to be received in future periods 256,000,000  
Pass-Through Certificates | Class B Pass-Through Certificates Issued September 2019 | United Airlines, Inc.    
Debt Instrument [Line Items]    
Face Amount $ 232,000,000  
Stated interest rate 3.50%  
Total debt recorded $ 25,000,000  
Proceeds received from issuance of debt 25,000,000  
Remaining proceeds from issuance of certificates to be received in future periods 207,000,000  
Pass-Through Certificates | Class AA Pass-Through Certificates Issued February 2019 | United Airlines, Inc.    
Debt Instrument [Line Items]    
Face Amount $ 717,000,000  
Stated interest rate 4.15%  
Total debt recorded $ 651,000,000  
Proceeds received from issuance of debt 651,000,000  
Remaining proceeds from issuance of certificates to be received in future periods 66,000,000  
Pass-Through Certificates | Class A Pass-Through Certificates Issued February 2019 | United Airlines, Inc.    
Debt Instrument [Line Items]    
Face Amount $ 296,000,000  
Stated interest rate 4.55%  
Total debt recorded $ 269,000,000  
Proceeds received from issuance of debt 269,000,000  
Remaining proceeds from issuance of certificates to be received in future periods 27,000,000  
Enhanced Equipment Trust Certificate [Member] | United Airlines, Inc.    
Debt Instrument [Line Items]    
Total debt recorded $ 1,052,000,000  
[1] Amounts adjusted due to the adoption of Accounting Standards Update No. 2016-02, Leases (Topic 842). See Note 1 to the financial statements contained in Part I, Item 1 of this report for additional information.

[2] Amounts adjusted due to the adoption of Accounting Standards Update No. 2016-02, Leases (Topic 842). See Note 1 to the financial statements contained in Part I, Item 1 of this report for additional information.