Annual report pursuant to Section 13 and 15(d)

COMPANY-SPONSORED EMPLOYEE BENEFIT PLANS - Additional Information (Detail)

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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%