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EMPLOYEE BENEFIT PLANS - Additional Information (Details) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2025 USD ($) employee | Dec. 31, 2024 USD ($)
Defined Benefit Plan Disclosure [Line Items] |  |
Multiemployer plans, payment term | 38 years |
National Master Agreement and Various Supplemental Agreements |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Number of employees covered | employee | 314,000 |
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 |
Other current liabilities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Withdrawal liability | $ 17 | $ 19
Defined Benefit Pension Plan |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Multi-employer plans, withdrawal obligation, fair value | 653 | 651
Defined Benefit Pension Plan | Long term debt |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Multiemployer plans, withdrawal obligation, present value | 802 | 804
Defined Benefit Pension Plan | Other current liabilities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Multiemployer plans, withdrawal obligation, present value | 9 | $ 9
U.S | Defined Benefit Pension Plan |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Amount contributed to company- sponsored benefit plans | 13 |
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 | 54 |
Estimated future employer contributions to defined benefit plan, current fiscal year | $ 167 |

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