Quarterly report pursuant to Section 13 or 15(d)

EMPLOYEE BENEFIT PLANS - Additional Information (Detail)

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EMPLOYEE BENEFIT PLANS - Additional Information (Detail)
$ in Millions
 3 Months Ended
Mar. 31, 2016
USD ($)
Employees
Mar. 31, 2015
USD ($)
Apr. 28, 2016
USD ($)
Dec. 31, 2015
USD ($)
Employees
Dec. 31, 2007
USD ($)
Defined Benefit Plan Disclosure [Line Items]          
Number of employees under a national master agreement and various supplemental agreements with local unions affiliated with Teamsters | Employees       266,000  
Remittance of retroactive economic benefits $ 108 $ 184      
Majority of ground mechanics not employed under agreements | Employees 3,100        
Multiemployer Plans, Payment Term 46 years        
Number of pilots under a collective bargaining agreement with the Independent Pilots Association | Employees 2,600        
International Pension Benefits          
Defined Benefit Plan Disclosure [Line Items]          
Amount contributed to company- sponsored benefit plans $ 20        
Estimated future employer contributions to defined benefit plan, current fiscal year 1.216        
U.S. Postretirement Medical Benefits          
Defined Benefit Plan Disclosure [Line Items]          
Amount contributed to company- sponsored benefit plans $ 23        
Estimated future employer contributions to defined benefit plan, current fiscal year 78        
Multiemployer Plans, Pension [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Multiemployer Plans, Withdrawal Obligation, Present Value $ 870     $ 872  
Multi-employer Plans, Withdrawal Obligation, Fair Value Disclosure $ 902     $ 841  
National Master Agreement (NMA) [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Remittance of retroactive economic benefits   $ 53      
Central States Pension Fund          
Defined Benefit Plan Disclosure [Line Items]          
Withdrawal liability         $ 6,100
Pension liability         $ 1,700
Minimum [Member] | Central States Pension Fund | Subsequent Event [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Pension liability     $ 3,200    
Maximum [Member] | Central States Pension Fund | Subsequent Event [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Pension liability     $ 3,800