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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 |

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- Definition Descriptive information regarding the employer's best estimate, as soon as it can be reasonably determined, of contributions expected to be paid in the current remaining fiscal period. Estimated contributions may be presented in the aggregate combining (1) contributions required by funding regulations or laws, (2) discretionary contributions, and (3) noncash contributions. Description may include a range of expected contributions, required minimum contribution, whether the expected contribution is discretionary, and further explanation. + References No definition available. + Details
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