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EMPLOYEE BENEFIT PLANS - Additional Information (Detail) $ in Millions |  | 9 Months Ended |
--- | --- | --- | ---
Dec. 31, 2007 USD ($) | Sep. 30, 2020 USD ($) | Dec. 31, 2019 USD ($) Employees
Defined Benefit Plan Disclosure [Line Items] |  |  |
Multiemployer Plans, Payment Term |  | 42 years |
Number of employees under a national master agreement and various supplemental agreements with local unions affiliated with Teamsters | Employees |  |  | 290,000
Number of pilots under a collective bargaining agreement with the Independent Pilots Association | Employees |  |  | 2,900
Ground mechanics employed under Teamster Local 272 | Employees |  |  | 1,500
Majority of ground mechanics not employed under agreements | Employees |  |  | 3,300
Multiemployer Plans, Pension [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Multi-employer Plans, Withdrawal Obligation, Fair Value Disclosure |  | $ 991 | $ 929
Multiemployer Plans, Pension [Member] | Central States Pension Fund |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Payment of withdrawal liability | $ 6,100 |  |
Pension liability |  | 4,800 | 2,600
Long term debt | Multiemployer Plans, Pension [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Multiemployer Plans, Withdrawal Obligation, Present Value |  | 839 | 845
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 | U.S. Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Amount contributed to company- sponsored benefit plans |  | 1,100 |
Estimated future employer contributions to defined benefit plan, current fiscal year |  | 24,000 |
U.S. Postretirement Medical Benefits | U.S. Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Amount contributed to company- sponsored benefit plans |  | 242 |
Pro Forma | Maximum | Multiemployer Plans, Pension [Member] | Central States Pension Fund |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Benefit Obligation, Period Increase (Decrease) |  | $ 2,200 |

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