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EMPLOYEE BENEFIT PLANS - Additional Information (Detail) $ in Millions |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2007 USD ($) | Mar. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) employee
Defined Benefit Plan Disclosure [Line Items] |  |  |
Multiemployer Plans, Payment Term |  | 42 years |
National Master Agreement And Various Supplemental Agreements |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Number of employees covered | employee |  |  | 327,000
National Master Agreement And Various Supplemental Agreements | UPS Freight |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Number of employees covered | employee |  |  | 11,000
Independent Pilots Association |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Number of employees covered | employee |  |  | 3,000
Teamsters Local 2727 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Number of employees covered | employee |  |  | 1,600
International Association Of Machinists And Aerospace Workers |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Number of employees covered | employee |  |  | 3,400
UPS/IBT Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Actuarial gain |  | $ 6,400 |
Reduction of the liability for coordinating benefits |  | 5,100 |
Gain from other updated actuarial assumptions |  | 1,300 |
Benefit from basis point increase in discount rate |  | $ 1,600 |
Basis point increase |  | 0.72% |
Asset loss resulting from actual asset returns |  | $ 300 |
Basis points below expected return |  | 2.20% |
Actuarial gain recorded in accumulated other comprehensive income |  | $ 3,100 |
Pre-tax actuarial gain |  | 3,300 |
Actuarial gain, after tax |  | 2,500 |
Defined Benefit Pension Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Multi-employer Plans, Withdrawal Obligation, Fair Value Disclosure |  | 916 | $ 1,000
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 |  | 835 | 837
Defined Benefit Pension Plan | Other current liabilities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Multiemployer Plans, Withdrawal Obligation, Present Value |  | 8 | $ 7
Defined Benefit Pension Plan | U.S. Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Amount contributed to company- sponsored benefit plans |  | 22 |
Estimated future employer contributions to defined benefit plan, current fiscal year |  | 72,000 |
U.S. Postretirement Medical Benefits | U.S. Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Amount contributed to company- sponsored benefit plans |  | 193 |
Estimated future employer contributions to defined benefit plan, current fiscal year |  | $ 63,000 |

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