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COMPANY-SPONSORED EMPLOYEE BENEFIT PLANS - Additional Information (Detail) - USD ($) |  | 12 Months Ended
--- | --- | ---
Apr. 30, 2021 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) | $ 2,100,000,000 | $ 20,900,000,000 | $ 6,500,000,000 |
Curtailment of benefit obligation |  | 34,000,000 |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement and Curtailment, After Tax |  | $ 24,000,000 |  |
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Settlement and Curtailment Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] |  | Investment income (expense) and other | Investment income (expense) and other | Investment income (expense) and other
Pension and postretirement benefit (income) expense |  | $ (129,000,000) | $ (2,456,000,000) | $ 7,125,000,000
Health care cost trends, initial annual rate increase |  | 7.50% |  |
Health care cost trends, an ultimate trend rate |  | 4.50% |  |
Employer contributions |  | $ 2,342,000,000 | $ 576,000,000 | $ 3,125,000,000
Service cost discount rate |  | 5.77% | 3.11% | 2.87%
Common stock held in plan assets (in shares) |  | 0 | 0 |
Hedge Funds | Other Investments |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Unfunded commitments to limited partnerships |  | $ 0 |  |
Risk Parity Funds | Other Investments |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Unfunded commitments to limited partnerships |  | 0 |  |
Private Equity and Real Estate | Other Investments |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Unfunded commitments to limited partnerships |  | 3,300,000,000 |  |
Defined Benefit Plan, Actuarial Assumptions Discount Rate |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) |  | 21,100,000,000 | $ 2,400,000,000 |
Defined Benefit Plan, Actuarial Assumptions Demographic and Assumption Changes |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) |  | (200,000,000) | (1,000,000,000.0) |
Employee Defined Contribution Plans |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Contributions charged to expense |  | 153,000,000 | 153,000,000 | $ 139,000,000
Pension and postretirement benefit (income) expense |  | 83,000,000 | 107,000,000 | 84,000,000
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 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Contributions charged to expense |  | 119,000,000 | 112,000,000 | $ 107,000,000
UPS/IBT Plan |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Reclassification to earnings, before tax |  |  | 3,300,000,000 |
Reclassification to earnings, after tax |  |  | 2,500,000,000 |
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 |
Pension Benefits |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Accumulated benefit obligation for pension plans |  | 44,800,000,000 | 62,700,000,000 |
Employer contributions |  | 31,000,000 | 29,000,000 |
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 |
Postemployment Retirement Benefits |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Accumulated benefit obligation for pension plans |  | 2,000,000,000.0 | 2,600,000,000 |
Postretirement Medical Benefits |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Employer contributions |  | $ 174,000,000 | $ 63,000,000 |
Minimum |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Duration for unfunded commitments to be contributed |  | 3 years |  |
Minimum | Private Equity and Real Estate | Other Investments |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Redemption notice period, lower limit |  | 10 years |  |
Minimum | Employee Defined Contribution Plans |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined contribution plan, employer contribution (percentage) |  | 3.00% |  |
Minimum | Amended Employee Defined Contribution Plans |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined contribution plan, employer contribution (percentage) |  | 5.00% |  |
Minimum | 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 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Duration for unfunded commitments to be contributed |  | 6 years |  |
Maximum | Private Equity and Real Estate | Other Investments |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Redemption notice period, upper limit |  | 15 years |  |
Maximum | Employee Defined Contribution Plans |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined contribution plan, employer contribution (percentage) |  | 8.00% |  |
Maximum | Amended Employee Defined Contribution Plans |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined contribution plan, employer contribution (percentage) |  | 8.00% |  |

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