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EMPLOYEE BENEFIT PLANS - Additional Information (Detail) $ in Millions |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Dec. 31, 2007 USD ($) | Jun. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) | Dec. 31, 2017 USD ($) Employees
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
Multiemployer Plans, Pension [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Multi-employer Plans, Withdrawal Obligation, Fair Value Disclosure |  |  | $ 836 | $ 921
Multiemployer Plans, Pension [Member] | Central States Pension Fund |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Payment of withdrawal liability | $ 6,100 |  |  |
Pension liability |  |  | 4,000 |
Other noncurrent liabilities | Multiemployer Plans, Pension [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Multiemployer Plans, Withdrawal Obligation, Present Value |  |  | 854 | 859
Other current liabilities | Multiemployer Plans, Pension [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Multiemployer Plans, Withdrawal Obligation, Present Value |  |  | $ 7 | $ 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 |  |  | $ 24 |
Defined Benefit Pension Plan | U.S. Pension Benefits |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Amount contributed to company- sponsored benefit plans |  |  | 74 |
U.S. Postretirement Medical Benefits |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Amount contributed to company- sponsored benefit plans |  |  | 63 |
Estimated future employer contributions to defined benefit plan, current fiscal year |  |  | $ 16 |

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