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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 |  |

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