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COMPANY-SPONSORED EMPLOYEE BENEFIT PLANS - Additional Information (Detail) |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Apr. 30, 2021 USD ($) | Jun. 30, 2021 USD ($) | Dec. 31, 2019 USD ($) Employee | Dec. 31, 2021 USD ($) shares | Dec. 31, 2020 USD ($) shares | Dec. 31, 2019 USD ($) Employee
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Number of covered persons | Employee |  |  | 18,800 |  |  | 18,800
Lump Sum Pension Payments |  |  | $ 820,000,000 |  |  |
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) | $ 2,100,000,000 |  |  | $ (6,500,000,000) | $ (10,100,000,000) |
Defined Benefit Plan, Actuarial Gain (Loss), Immediate Recognition as Component in Net Periodic Benefit (Cost) Credit | $ 3,700,000,000 |  |  |  |  |
Defined Benefit Plan, Increase In Discount Rate | 0.49% |  |  |  |  |
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) Due To Workforce Reduction | $ 100,000,000 |  |  |  |  |
Actual return on plan assets | $ 1,700,000,000 |  |  |  |  |
Defined Benefit Plan, Percentage Points Below Expected Return | 4.30% |  |  |  |  |
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, before Tax | $ 2,100,000,000 |  |  |  |  |
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), before Tax |  | $ 69,000,000 |  |  |  |
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), after Tax |  | 52,000,000 |  |  |  |
Other Comprehensive Income (Loss), Defined Benefit Plan, Plan Amendments, Reclassification Adjustment from AOCI, before Tax |  | 66,000,000 |  |  |  |
Other Comprehensive Income (Loss), Defined Benefit Plan, Plan Amendments, Reclassification Adjustment from AOCI, After Tax |  | $ 50,000,000 |  |  |  |
Pension and postretirement benefit (income) expense |  |  |  | $ (2,456,000,000) | 7,125,000,000 | $ 3,141,000,000
Health care cost trends, initial annual rate increase |  |  |  | 6.25% |  |
Health care cost trends, an ultimate trend rate |  |  |  | 4.50% |  |
Employer contributions |  |  |  | $ 576,000,000 | $ 3,125,000,000 | $ 2,362,000,000
Service cost discount rate |  |  |  | 3.11% | 2.87% | 3.55%
Common stock held in plan assets (in shares) | shares |  |  |  | 0 | 0 |
Private Equity and Real Estate | Other Investments |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Unfunded commitments to limited partnerships |  |  |  | $ 3,000,000,000.0 |  |
Defined Benefit Plan, Actuarial Assumptions Discount Rate |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) |  |  |  | (2,400,000,000) | $ (7,300,000,000) |
Defined Benefit Plan, Actuarial Assumptions Demographic and Assumption Changes |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) |  |  |  | (973,000,000) | 513,000,000 |
Employee Defined Contribution Plans [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Contributions charged to expense |  |  |  | 153,000,000 | 139,000,000 | $ 130,000,000
Pension and postretirement benefit (income) expense |  |  |  | 107,000,000 | 84,000,000 | 67,000,000
Amended Employee Defined Contribution Plans |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Defined Contribution Plan, Increase (Decrease), Cost |  |  |  | 0 | 0 | 0
Defined Contribution Money Purchase Plans [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Contributions charged to expense |  |  |  | 112,000,000 | 107,000,000 | $ 97,000,000
UPS/IBT Plan |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Actuarial Gain (Loss), Immediate Recognition as Component in Net Periodic Benefit (Cost) Credit |  |  |  | 6,400,000,000 |  |
Defined Benefit Plan, Reduction Of Liability For Coordinating Benefits |  |  |  | 5,100,000,000 |  |
Defined Benefit Plan, Actuarial Gain (Loss), Other Actuarial Assumptions |  |  |  | 1,300,000,000 |  |
Defined Benefit Plan, Gain (Loss) From Increase In Discount Rate |  |  |  | $ 1,600,000,000 |  |
Defined Benefit Plan, Increase (Decrease) In Discount Rate |  |  |  | 0.72% |  |
Defined Benefit Plan, Gain (Loss) On Actual Asset Returns |  |  |  | $ 300,000,000 |  |
Defined Benefit Plan, Difference In Expected Return, Percent |  |  |  | 2.20% |  |
Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), Gain (Loss), before Tax |  |  |  | $ 3,100,000,000 |  |
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax |  |  |  | 3,300,000,000 |  |
Reclassification to earnings (net of tax effect of $67, $1,876 and $378) |  |  |  | 2,500,000,000 |  |
Pension Benefits |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Accumulated benefit obligation for pension plans |  |  |  | 62,700,000,000 | 66,900,000,000 |
Employer contributions |  |  |  | 29,000,000 | 26,000,000 |
Pension Benefits | Central States, South East & South West Areas Health and Welfare Fund |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) |  |  |  | (5,100,000,000) | (2,300,000,000) |
Multiemployer Plans, Withdrawal Obligation |  |  |  | 6,100,000,000 |  |
Liability, Defined Benefit Pension Plan |  |  |  |  | 5,500,000,000 |
Postemployment Retirement Benefits |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Accumulated benefit obligation for pension plans |  |  |  | 2,600,000,000 | 2,800,000,000 |
Postretirement Medical Benefits |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Employer contributions |  |  |  | $ 63,000,000 | $ 77,000,000 |
Minimum [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Duration for unfunded commitments to be contributed |  |  |  | 3 years |  |
Minimum [Member] | Private Equity and Real Estate | Other Investments |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Redemption notice period, lower limit |  |  |  | 10 years |  |
Minimum [Member] | Employee Defined Contribution Plans [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Defined contribution plan, employer contribution (percentage) |  |  |  | 3.00% |  |
Minimum [Member] | Amended Employee Defined Contribution Plans |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Defined contribution plan, employer contribution (percentage) |  |  |  | 5.00% |  |
Minimum [Member] | U.S. Pension Benefits |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Postretirement medical plans service minimum eligibility year |  |  |  | 10 years |  |
Postretirement medical plans service minimum eligibility age |  |  |  | 55 years |  |
Maximum [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Duration for unfunded commitments to be contributed |  |  |  | 6 years |  |
Maximum [Member] | Private Equity and Real Estate | Other Investments |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Redemption notice period, upper limit |  |  |  | 15 years |  |
Maximum [Member] | Employee Defined Contribution Plans [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Defined contribution plan, employer contribution (percentage) |  |  |  | 8.00% |  |
Maximum [Member] | Amended Employee Defined Contribution Plans |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Defined contribution plan, employer contribution (percentage) |  |  |  | 8.00% |  |

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