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EMPLOYEE BENEFIT PLANS - Additional Information (Detail) $ in Millions |  | 3 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2007 USD ($) | Mar. 31, 2022 USD ($) employee | Mar. 31, 2021 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($)
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Curtailment gain, before tax |  | $ 33 |  |  |
Curtailment gain, after tax |  | $ 24 |  |  |
Multiemployer Plans, Payment Term |  | 41 years |  |  |
National Master Agreement And Various Supplemental Agreements |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Number of employees covered | employee |  | 327,000 |  |  |
Independent Pilots Association |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Number of employees covered | employee |  | 3,200 |  |  |
Teamsters Local 2727 |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Number of employees covered | employee |  | 1,700 |  |  |
International Association Of Machinists And Aerospace Workers |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Number of employees covered | employee |  | 3,300 |  |  |
UPS/IBT Plan |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Actuarial gain (loss) |  |  | $ 6,400 |  |
Reduction of the liability for coordinating benefits |  |  | 5,100 |  |
Gain from other updated actuarial assumptions |  |  | $ 1,300 |  |
Defined Benefit Pension Plan |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Multi-employer Plans, Withdrawal Obligation, Fair Value Disclosure |  | $ 849 |  | $ 963 |
Defined Benefit Pension Plan | Central States Pension Fund |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Payment of withdrawal liability | $ 6,100 |  |  |  |
Pension liability |  |  |  |  | $ 5,500
Defined Benefit Pension Plan | Long term debt |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Multiemployer Plans, Withdrawal Obligation, Present Value |  | 828 |  | 830 |
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] |  |  |  |  |
Amount contributed to company- sponsored benefit plans |  | 31 |  |  |
Estimated future employer contributions to defined benefit plan, current fiscal year |  | 2,000 |  |  |
U.S. Postretirement Medical Benefits | U.S. Pension Benefits |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Amount contributed to company- sponsored benefit plans |  | 14 |  |  |
Estimated future employer contributions to defined benefit plan, current fiscal year |  | $ 264 |  |  |

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