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Special Items - Additional Information (Detail)
 1 Months Ended 3 Months Ended 12 Months Ended
Apr. 30, 2016
Contract
Dec. 31, 2016
USD ($)
Sep. 30, 2016
USD ($)
Jun. 30, 2016
USD ($)
Mar. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
VEF / $
Sep. 30, 2015
USD ($)
Jun. 30, 2015
USD ($)
Mar. 31, 2015
USD ($)
Dec. 31, 2016
USD ($)
Contract
plan
Dec. 31, 2015
USD ($)
VEF / $
Dec. 31, 2014
USD ($)
Aircraft
Attendant
Special Charges [Line Items]                        
Impairment of indefinite-lived intangible assets           $ 33,000,000           $ 16,000,000
Impairment of indefinite-lived intangible assets, net of tax benefits           22,000,000           10,000,000
Lease maturity year                   2029    
Cleveland airport lease restructuring         $ 74,000,000         $ 74,000,000    
Cleveland airport lease restructuring, net of taxes                   47,000,000    
Labor agreement costs   $ (60,000,000) $ 14,000,000 $ 10,000,000 100,000,000 18,000,000       64,000,000 $ 18,000,000  
Severance and benefits   10,000,000 13,000,000 6,000,000 8,000,000 4,000,000 $ 28,000,000 $ 25,000,000 $ 50,000,000 37,000,000 107,000,000 199,000,000
Severance and benefits costs net of tax                   24,000,000    
(Gains) losses on sale of assets and other miscellaneous (gains) losses, net   19,000,000 $ 18,000,000 6,000,000 8,000,000 61,000,000 30,000,000 19,000,000 12,000,000 51,000,000 122,000,000 195,000,000
(Gains) losses on sale of assets and other special charges, net of tax                   33,000,000    
Venezuela local currency loss                   8,000,000 61,000,000  
Venezuela local currency loss, net of tax                   5,000,000    
Sale of an affiliate                   9,000,000    
Sale of an affiliate, net of tax                   6,000,000    
Costs associated with aircraft           8,000,000           66,000,000
Inventory held for sale           $ 7,000,000         7,000,000  
Impairment for discontinued internal software projects                     10,000,000  
Impairment of assets held for disposal                     10,000,000  
Charges for legal matters                     32,000,000  
Collective bargaining agreements                     18,000,000  
Integration-related costs                     60,000,000 96,000,000
Cease use of an aircraft under lease                     $ 16,000,000  
Foreign currency exchange rate per US dollar, description                     200 Venezuelan bolivars to one U.S. dollar  
Foreign currency exchange rate | VEF / $           200         200  
Losses (gain) on extinguishment of debt and other       $ (9,000,000) $ 8,000,000 $ 7,000,000 $ 61,000,000 $ 128,000,000 $ 6,000,000 (1,000,000) $ 202,000,000 $ 74,000,000
Number of leased aircraft | Aircraft                       21
Lease expiry year                       2018
Debt instrument principal amount                       $ 248,000,000
Unsecured Debt                        
Special Charges [Line Items]                        
Venezuela local currency loss                       10,000,000
Losses (gain) on extinguishment of debt and other                       64,000,000
Cleveland                        
Special Charges [Line Items]                        
Severance and benefits                       58,000,000
Boeing 737-300 and 737-500 fleets                        
Special Charges [Line Items]                        
Impairment of assets held for disposal                       $ 33,000,000
6% Convertible Junior Subordinated Debentures                        
Special Charges [Line Items]                        
Debt instrument stated interest rate                       6.00%
6% Convertible preferred securities                        
Special Charges [Line Items]                        
Debt instrument stated interest rate                       6.00%
Newark Liberty International Airport                        
Special Charges [Line Items]                        
Impairment of indefinite-lived intangible assets                   412,000,000    
Impairment of indefinite-lived intangible assets, net of tax benefits                   $ 264,000,000    
United Airlines, Inc. | 6% Notes due 2026 and 2028                        
Special Charges [Line Items]                        
Write off of unamortized discount                     134,000,000  
Venezuelan bolivars                        
Special Charges [Line Items]                        
Unrestricted cash balance held as Venezuelan bolivars           $ 13,000,000         $ 13,000,000  
Flight Attendant Postretirement Medical Plan | Postretirement Medical Plan                        
Special Charges [Line Items]                        
Number of plans amended | plan                   2    
Curtailment gain recognition of prior service credit                   $ 47,000,000    
Curtailment gain recognition of prior service credit,net of tax                   30,000,000    
Scenario, Previously Reported                        
Special Charges [Line Items]                        
Foreign currency exchange rate per US dollar, description                     13.5 Venezuelan bolivars to one U.S. dollar  
Foreign currency exchange rate | VEF / $           13.5         13.5  
Int'1 Association of Machinists                        
Special Charges [Line Items]                        
Curtailment gain recognition of prior service credit                   60,000,000    
Curtailment gain recognition of prior service credit,net of tax                   $ 38,000,000    
Number of new contracts extended | Contract 7                 7    
Service contract extended year 2021                 2021    
Labor agreement costs                   $ 171,000,000    
Labor agreement costs net of tax                   110,000,000    
Voluntary early out program                        
Special Charges [Line Items]                        
Severance and benefits                       $ 141,000,000
Number of positions eliminated | Attendant                       2,500
Number of positions eliminated | Attendant                       2,500
Voluntary early out program | Maximum                        
Special Charges [Line Items]                        
Severance payment per participant   $ 100,000       $ 100,000       $ 100,000 $ 100,000 $ 100,000
Integration Related                        
Special Charges [Line Items]                        
(Gains) losses on sale of assets and other miscellaneous (gains) losses, net                     $ 14,000,000 $ 33,000,000