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)
Employee in Thousands, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2015
USD ($)
Employees
Jun. 30, 2014
USD ($)
Employee
Jun. 30, 2015
USD ($)
Employees
Dec. 31, 2014
USD ($)
Employees
Jun. 30, 2014
USD ($)
Employee
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       270,000  
Remittance of retroactive economic benefits   $ 278 $ 179   $ 241
Full-time employees affected by change in healthcare benefits | Employee   36     36
part-time employees affected by changes in healthcare benefits | Employee   73     73
Employees Covered by Other Collective Bargaining Agreements | Employee   16     16
Majority of ground mechanics not employed under agreements | Employees 3,100   3,100    
Multiemployer Plans, Payment Term     47 years    
Number of pilots under a collective bargaining agreement with the Independent Pilots Association | Employees 2,600   2,600    
Health and Welfare Plan Changes, After Tax Charges   $ 665      
Increase (Decrease) in Postretirement Obligations   2,271     $ 2,271
Cash Tax Benefits Received   375   $ 479  
Change In Post-Retirement Benefit and AOCI   13     13
International Pension Benefits          
Defined Benefit Plan Disclosure [Line Items]          
Amount contributed to company- sponsored benefit plans     $ 45    
Estimated future employer contributions to defined benefit plan, current fiscal year     1.075    
U.S. Postretirement Medical Benefits          
Defined Benefit Plan Disclosure [Line Items]          
Amount contributed to company- sponsored benefit plans     $ 54    
Estimated future employer contributions to defined benefit plan, current fiscal year     50    
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements and Curtailments $ 0 (320) $ 0   $ (320)
Multiemployer Plans, Pension [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Multiemployer Plans, Withdrawal Obligation, Present Value 875   875 878  
Multi-employer Plans, Withdrawal Obligation, Fair Value Disclosure $ 834   $ 834 $ 913  
National Master Agreement (NMA) [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements and Curtailments   1,066      
partial plan curtailment [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements and Curtailments   (112)      
remeasurement of postretirement obligation [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements and Curtailments   (746)      
defined benefit plan settlement losses [Member] | National Master Agreement (NMA) [Domain]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements and Curtailments   $ (208)