Annual report pursuant to Section 13 and 15(d)

COMPANY-SPONSORED EMPLOYEE BENEFIT PLANS - Reconciliation of the Changes in the Plans' Benefit Obligations and Fair Value of Plan Assets (Detail)

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COMPANY-SPONSORED EMPLOYEE BENEFIT PLANS - Reconciliation of the Changes in the Plans' Benefit Obligations and Fair Value of Plan Assets (Detail) - USD ($)
$ in Millions
 12 Months Ended
Apr. 30, 2021
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Benefit Obligations:        
Actuarial (gain)/loss $ (2,100) $ 6,500 $ 10,100  
Fair Value of Plan Assets:        
Fair value of plan assets at beginning of year   54,881    
Actual return on plan assets $ 1,700      
Fair value of plan assets at end of year   58,175 54,881  
United States        
Fair Value of Plan Assets:        
Fair value of plan assets at beginning of year   53,046    
Fair value of plan assets at end of year   56,069 53,046  
International Pension Benefits        
Fair Value of Plan Assets:        
Fair value of plan assets at beginning of year   1,835    
Fair value of plan assets at end of year   2,106 1,835  
Pension Benefits | United States        
Benefit Obligations:        
Projected benefit obligation at beginning of year   65,922 54,039  
Service cost   1,897 1,853 $ 1,439
Interest cost   1,948 1,977 2,067
Gross benefits paid   (1,906) (1,846)  
Plan participants’ contributions   0 0  
Plan amendments   66 171  
Actuarial (gain)/loss   (6,390) 9,728  
Foreign currency exchange rate changes   0 0  
Curtailments and settlements   (159) 0  
Other   0 0  
Projected benefit obligation at end of year   61,378 65,922 54,039
Fair Value of Plan Assets:        
Fair value of plan assets at beginning of year   52,997 46,172  
Actual return on plan assets   4,706 5,878  
Employer contributions   157 2,793  
Plan participants’ contributions   0 0  
Gross benefits paid   (1,906) (1,846)  
Foreign currency exchange rate changes   0 0  
Curtailments and settlements   0 0  
Other   0 0  
Fair value of plan assets at end of year   55,954 52,997 46,172
Pension Benefits | International Pension Benefits        
Benefit Obligations:        
Projected benefit obligation at beginning of year   2,177 1,906  
Service cost   76 67 57
Interest cost   38 40 47
Gross benefits paid   (46) (38)  
Plan participants’ contributions   3 3  
Plan amendments   0 1  
Actuarial (gain)/loss   (111) 123  
Foreign currency exchange rate changes   (32) 80  
Curtailments and settlements   (3) (6)  
Other   4 1  
Projected benefit obligation at end of year   2,106 2,177 1,906
Fair Value of Plan Assets:        
Fair value of plan assets at beginning of year   1,835 1,558  
Actual return on plan assets   230 184  
Employer contributions   102 69  
Plan participants’ contributions   3 3  
Gross benefits paid   (46) (38)  
Foreign currency exchange rate changes   (15) 62  
Curtailments and settlements   (3) (3)  
Other   0 0  
Fair value of plan assets at end of year   2,106 1,835 1,558
Postemployment Retirement Benefits | United States        
Benefit Obligations:        
Projected benefit obligation at beginning of year   2,759 2,616  
Service cost   28 29 23
Interest cost   81 91 108
Gross benefits paid   (278) (274)  
Plan participants’ contributions   35 32  
Plan amendments   0 0  
Actuarial (gain)/loss   (26) 265  
Foreign currency exchange rate changes   0 0  
Curtailments and settlements   (7) 0  
Other   0 0  
Projected benefit obligation at end of year   2,592 2,759 2,616
Fair Value of Plan Assets:        
Fair value of plan assets at beginning of year   49 37  
Actual return on plan assets   (8) (9)  
Employer contributions   317 263  
Plan participants’ contributions   35 32  
Gross benefits paid   (278) (274)  
Foreign currency exchange rate changes   0 0  
Curtailments and settlements   0 0  
Other   0 0  
Fair value of plan assets at end of year   $ 115 $ 49 $ 37