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EMPLOYEE BENEFIT PLANS - Additional Information (Detail) $ in Millions | 6 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2018 USD ($) | Dec. 31, 2017 USD ($) Employees | Dec. 31, 2007 USD ($)
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan, net actuarial gain | $ 569 |  |
Defined benefit plan, curtailments | 1,525 |  |
Defined benefit plan, net actuarial loss | $ 956 |  |
Defined benefit plan, assumptions used calculating benefit obligation, discount rate |  | 0.32% |
Defined benefit plan,actual return on plan assets |  | 2.75% |
Actuarial gain loss corridor threshold | 10.00% |  |
Multiemployer Plans, Payment Term | 44 years |  |
Number of employees under a national master agreement and various supplemental agreements with local unions affiliated with Teamsters | Employees |  | 280,000 |
Number of pilots under a collective bargaining agreement with the Independent Pilots Association | Employees |  | 2,700 |
Majority of ground mechanics not employed under agreements | Employees |  | 3,100 |
Central States Pension Fund |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Withdrawal liability |  |  | $ 6,100
Pension liability | $ 4,000 |  |
Multiemployer Plans, Pension [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Multi-employer Plans, Withdrawal Obligation, Fair Value Disclosure | 841 | $ 921 |
Other noncurrent liabilities | Multiemployer Plans, Pension [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Multiemployer Plans, Withdrawal Obligation, Present Value | 856 | 859 |
Other current liabilities | Multiemployer Plans, Pension [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Multiemployer Plans, Withdrawal Obligation, Present Value | $ 8 | $ 8 |
Minimum [Member] | Non-union employees |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Employer contribution percentage | 5.00% |  |
Maximum [Member] | Non-union employees |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Employer contribution percentage | 8.00% |  |
Defined Benefit Pension Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Estimated future employer contributions to defined benefit plan, current fiscal year | 48 |  |
Defined Benefit Pension Plan | U.S. Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Amount contributed to company- sponsored benefit plans | $ 50 |  |
U.S. Postretirement Medical Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Amount contributed to company- sponsored benefit plans | $ 42 |  |
Estimated future employer contributions to defined benefit plan, current fiscal year | 37 |  |

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