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MULTIEMPLOYER EMPLOYEE BENEFIT PLANS - Additional Information (Details) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2024 USD ($) employee | Dec. 31, 2023 USD ($) | Dec. 31, 2022 | Dec. 31, 2012 employee
Multiemployer Plans [Line Items] |  |  |  |
Number of employees under a national master agreement and various supplemental agreements with local unions affiliated with Teamster | 314,000 |  |  |
Number of employees under a collective bargaining agreement with the teamsters | 10,000 |  |  |
Number of pilots under a collective bargaining agreement with the Independent Pilots Association | 3,300 |  |  |
Ground mechanics employed under IAM agreements | 1,900 |  |  |
Employees not employed under agreement with teamsters | 3,000 |  |  |
Other current liabilities |  |  |  |
Multiemployer Plans [Line Items] |  |  |  |
Withdrawal liability | $ | $ 19 |  |  |
Pension Benefits |  |  |  |
Multiemployer Plans [Line Items] |  |  |  |
Multiemployer pension plans, maximum term to forecast a funding deficiency in the orange zone | 6 years |  |  |
Multiemployer plans, period contributions, significance of contributions | 5.00% | 5.00% | 5.00% |
Debt instrument, term | 38 years |  |  |
Multi-employer plans, fair value of withdrawal liability | $ | $ 651 | $ 710 |  |
Pension Benefits | Other non-current liabilities |  |  |  |
Multiemployer Plans [Line Items] |  |  |  |
Multiemployer plans, present value of withdrawal liability | $ | 804 | 813 |  |
Pension Benefits | Other current liabilities |  |  |  |
Multiemployer Plans [Line Items] |  |  |  |
Multiemployer plans, present value of withdrawal liability | $ | $ 9 | $ 9 |  |
Red Zone, Less than 65% Funded | Maximum | Pension Benefits |  |  |  |
Multiemployer Plans [Line Items] |  |  |  |
Multiemployer pension plans, percentage of plan funded | 65.00% |  |  |
Otange Zone, Less than 80% and Have an Accumulated Funding Deficiency or Expect to Have a Deficiency Within Six Years | Pension Benefits |  |  |  |
Multiemployer Plans [Line Items] |  |  |  |
Multiemployer pension plans, percentage of plan funded | 80.00% |  |  |
Yellow Zone, Less than 80% Funded | Maximum | Pension Benefits |  |  |  |
Multiemployer Plans [Line Items] |  |  |  |
Multiemployer pension plans, percentage of plan funded | 80.00% |  |  |
Green Zone, At Least 80% Funded | Minimum | Pension Benefits |  |  |  |
Multiemployer Plans [Line Items] |  |  |  |
Multiemployer pension plans, percentage of plan funded | 80.00% |  |  |
Represented by Teamsters |  |  |  |
Multiemployer Plans [Line Items] |  |  |  |
Number of employees under a national master agreement and various supplemental agreements with local unions affiliated with Teamster |  |  |  | 10,200

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