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EMPLOYEE BENEFIT PLANS - Additional Information (Details) $ in Millions | 1 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jan. 31, 2023 USD ($) | Jun. 30, 2024 USD ($) employee | Dec. 31, 2023 USD ($)
Defined Benefit Plan Disclosure [Line Items] |  |  |
Multiemployer plans, payment term |  | 38 years |
Defined Benefit Pension Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Multi-employer plans, withdrawal obligation, fair value |  | $ 665 | $ 710
U.S | Defined Benefit Pension Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Amount contributed to company- sponsored benefit plans |  | 33 |
Estimated future employer contributions to defined benefit plan, current fiscal year |  | 1,200 |
U.S | U.S. Postretirement Medical Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Amount contributed to company- sponsored benefit plans |  | 117 |
Estimated future employer contributions to defined benefit plan, current fiscal year |  | $ 50 |
Central States Pension Fund |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Government assistance, amount | $ 35,800 |  |
National Master Agreement and Various Supplemental Agreements |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Number of employees covered | employee |  | 310,000 |
Teamsters |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Number of employees covered | employee |  | 10,000 |
Independent Pilots Association |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Number of employees covered | employee |  | 3,300 |
Teamsters Local 2727 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Number of employees covered | employee |  | 1,900 |
International Association Of Machinists And Aerospace Workers |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Number of employees covered | employee |  | 3,000 |
Long term debt | Defined Benefit Pension Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Multiemployer plans, withdrawal obligation, present value |  | $ 809 | 813
Other current liabilities | Defined Benefit Pension Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Multiemployer plans, withdrawal obligation, present value |  | $ 9 | $ 9

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