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PENSION, POSTRETIREMENT AND OTHER EMPLOYEE BENEFIT PLANS - Participation in the IAM National Pension Plan (Details) - IAM National Pension Plan - USD ($) $ in Millions		12 Months Ended
	Jan. 01, 2022	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Jan. 01, 2023
Multiemployer Plans [Line Items]
Multi-employer plan contributions			$ 570
Pension Benefits
Multiemployer Plans [Line Items]
Plan length	10 years
Additional contribution as a percentage of the hourly contribution rate	2.50%
Surcharge imposed		No
Pension Benefits | United Airlines, Inc.
Multiemployer Plans [Line Items]
Funded percentage					86.50%
Contributions		$ 95	$ 87	$ 75

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