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 6 Months Ended
Jun. 30, 2017
USD ($)
Employees
Jun. 30, 2017
USD ($)
Employees
Jun. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
Employees
Dec. 31, 2007
USD ($)
Defined Benefit Plan Disclosure [Line Items]          
Defined benefit plan, net actuarial gain $ 569        
Defined benefit plan, net actuarial loss $ 956        
Actuarial gain loss corridor threshold 10.00% 10.00%      
Defined benefit plan, curtailments $ 1,525        
Defined benefit plan, assumptions used calculating benefit obligation, discount rate 3.20% 3.20%      
Defined benefit plan,actual return on plan assets 2.75% 2.75%      
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   $ 18 $ 73    
Majority of ground mechanics not employed under agreements | Employees 3,000 3,000      
Multiemployer Plans, Payment Term   45 years      
Number of pilots under a collective bargaining agreement with the Independent Pilots Association | Employees 2,600 2,600      
U.S. Pension Benefits          
Defined Benefit Plan Disclosure [Line Items]          
Amount contributed to company- sponsored benefit plans   $ 2,334      
International Pension Benefits          
Defined Benefit Plan Disclosure [Line Items]          
Estimated future employer contributions to defined benefit plan, current fiscal year   43      
U.S. Postretirement Medical Benefits          
Defined Benefit Plan Disclosure [Line Items]          
Amount contributed to company- sponsored benefit plans   $ 196      
Estimated future employer contributions to defined benefit plan, current fiscal year   45      
Multiemployer Plans, Pension [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Multi-employer Plans, Withdrawal Obligation, Fair Value Disclosure $ 888 $ 888   $ 861  
Central States Pension Fund          
Defined Benefit Plan Disclosure [Line Items]          
Withdrawal liability         $ 6,100
Pension liability 4,000 $ 4,000      
Minimum [Member] | Employees          
Defined Benefit Plan Disclosure [Line Items]          
Employer contribution percentage   3.00%      
Minimum [Member] | Non-union employees          
Defined Benefit Plan Disclosure [Line Items]          
Employer contribution percentage   5.00%      
Maximum [Member] | Employees          
Defined Benefit Plan Disclosure [Line Items]          
Employer contribution percentage   8.00%      
Maximum [Member] | Non-union employees          
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 862 $ 862   866  
Other current liabilities | Multiemployer Plans, Pension [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Multiemployer Plans, Withdrawal Obligation, Present Value $ 6 $ 6   $ 6