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v3.23.1

EMPLOYEE BENEFIT PLANS - Additional Information (Details) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2023 USD ($) employee | Mar. 31, 2022 USD ($) | Dec. 31, 2022 USD ($)
Defined Benefit Plan Disclosure [Line Items] |  |  |
Curtailment gain |  | $ 33 |
Curtailment gain, after tax |  | 24 |
Multiemployer plans, payment term | 40 years |  |
National Master Agreement And Various Supplemental Agreements |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Number of employees covered | employee | 330,000 |  |
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 | 3,500 |  |
Teamsters Local 2727 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Number of employees covered | employee | 1,800 |  |
International Association Of Machinists And Aerospace Workers |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Number of employees covered | employee | 3,100 |  |
Defined Benefit Pension Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Multi-employer plans, withdrawal obligation, fair value | $ 710 |  | $ 686
Defined Benefit Pension Plan | Long term debt |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Multiemployer plans, withdrawal obligation, present value | 819 |  | 821
Defined Benefit Pension Plan | Other current liabilities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Multiemployer plans, withdrawal obligation, present value | 8 |  | $ 8
Defined Benefit Pension Plan | U.S. Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Curtailment gain | 0 | 0 |
Amount contributed to company- sponsored benefit plans | 1,200 |  |
Estimated future employer contributions to defined benefit plan, current fiscal year | 78 |  |
U.S. Postretirement Medical Benefits | U.S. Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Curtailment gain | 0 | $ 0 |
Amount contributed to company- sponsored benefit plans | 74 |  |
Estimated future employer contributions to defined benefit plan, current fiscal year | $ 44 |  |

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