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EMPLOYEE BENEFIT PLANS - Additional Information (Detail) $ in Millions |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Dec. 31, 2007 USD ($) | Mar. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) Employees | Jun. 30, 2017
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit plan, assumptions used calculating benefit obligation, discount rate |  |  |  | 0.32%
Defined benefit plan,actual return on plan assets |  |  |  | 2.75%
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 |  |  | 283,000 |
Number of pilots under a collective bargaining agreement with the Independent Pilots Association | Employees |  |  | 2,800 |
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 |  | $ 851 | $ 832 |
Multiemployer Plans, Pension [Member] | Central States Pension Fund |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Payment of withdrawal liability | $ 6,100 |  |  |
Defined Benefit Plan, Benefit Obligation, Period Increase (Decrease) |  |  | 1,600 |
Pension liability |  | 4,000 |  |
Long term debt | Multiemployer Plans, Pension [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Multiemployer Plans, Withdrawal Obligation, Present Value |  | 850 | 852 |
Other current liabilities | Multiemployer Plans, Pension [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Multiemployer Plans, Withdrawal Obligation, Present Value |  | 7 | $ 7 |
Defined Benefit Pension Plan |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Estimated future employer contributions to defined benefit plan, current fiscal year |  | 2,100 |  |
Defined Benefit Pension Plan | U.S. Pension Benefits |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Amount contributed to company- sponsored benefit plans |  | 22 |  |
U.S. Postretirement Medical Benefits |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Amount contributed to company- sponsored benefit plans |  | 192 |  |
Estimated future employer contributions to defined benefit plan, current fiscal year |  | 52 |  |
Pro Forma | Maximum [Member] | Multiemployer Plans, Pension [Member] | Central States Pension Fund |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Benefit Obligation, Period Increase (Decrease) |  | $ 2,400 |  |

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