Annual report pursuant to Section 13 and 15(d)

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

v3.22.0.1
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%