Quarterly report pursuant to Section 13 or 15(d)

EMPLOYEE BENEFIT PLANS - Additional Information (Detail)

v3.7.0.1
EMPLOYEE BENEFIT PLANS - Additional Information (Detail)
$ in Millions
 3 Months Ended
Mar. 31, 2017
USD ($)
Employees
Mar. 31, 2016
USD ($)
Dec. 31, 2016
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     268,000  
Remittance of retroactive economic benefits $ 35 $ 108    
Majority of ground mechanics not employed under agreements | Employees 3,000      
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 $ 2,312      
Estimated future employer contributions to defined benefit plan, current fiscal year 65      
U.S. Postretirement Medical Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Amount contributed to company- sponsored benefit plans $ 177      
Estimated future employer contributions to defined benefit plan, current fiscal year 64      
Multiemployer Plans, Pension [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Multi-employer Plans, Withdrawal Obligation, Fair Value Disclosure $ 861      
Central States Pension Fund        
Defined Benefit Plan Disclosure [Line Items]        
Withdrawal liability       $ 6,100
Pension liability $ 4,000      
Minimum [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Employer contribution percentage 3.00%      
Maximum [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Employer contribution percentage 8.00%      
Other noncurrent liabilities | Multiemployer Plans, Pension [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Multiemployer Plans, Withdrawal Obligation, Present Value $ 864   $ 866  
Other current liabilities | Multiemployer Plans, Pension [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Multiemployer Plans, Withdrawal Obligation, Present Value $ 6   $ 6