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 (Details)

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COMPANY-SPONSORED EMPLOYEE BENEFIT PLANS - Reconciliation of the Changes in the Plans' Benefit Obligations and Fair Value of Plan Assets (Details) - USD ($)
$ in Millions
 12 Months Ended
Apr. 30, 2021
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Benefit Obligations:        
Actuarial (gain)/loss $ (2,100) $ 2,400 $ (20,900)  
Fair Value of Plan Assets:        
Fair value of plan assets at beginning of year   43,916    
Fair value of plan assets at end of year   45,482 43,916  
United States        
Fair Value of Plan Assets:        
Fair value of plan assets at beginning of year   42,273    
Fair value of plan assets at end of year   43,589 42,273  
International Pension Benefits        
Fair Value of Plan Assets:        
Fair value of plan assets at beginning of year   1,643    
Fair value of plan assets at end of year   1,893 1,643  
Pension Benefits | United States        
Benefit Obligations:        
Projected benefit obligation at beginning of year   43,504 61,378  
Service cost   1,172 2,024 $ 1,897
Interest cost   2,508 1,950 1,948
Gross benefits paid   (2,437) (2,151)  
Plan participants’ contributions   0 0  
Plan amendments   699 145  
Actuarial (gain)/loss   2,266 (19,842)  
Foreign currency exchange rate changes   0 0  
Curtailments and settlements   0 0  
Other   0 0  
Projected benefit obligation at end of year   47,712 43,504 61,378
Fair Value of Plan Assets:        
Fair value of plan assets at beginning of year   42,058 55,954  
Actual return on plan assets   2,664 (13,657)  
Employer contributions   1,206 1,912  
Plan participants’ contributions   0 0  
Gross benefits paid   (2,437) (2,151)  
Foreign currency exchange rate changes   0 0  
Curtailments and settlements   0 0  
Other   0 0  
Fair value of plan assets at end of year   43,491 42,058 55,954
Pension Benefits | International Pension Benefits        
Benefit Obligations:        
Projected benefit obligation at beginning of year   1,416 2,106  
Service cost   43 68 76
Interest cost   66 45 38
Gross benefits paid   (46) (45)  
Plan participants’ contributions   4 3  
Plan amendments   0 0  
Actuarial (gain)/loss   99 (575)  
Foreign currency exchange rate changes   51 (150)  
Curtailments and settlements   (38) (40)  
Other   6 4  
Projected benefit obligation at end of year   1,601 1,416 2,106
Fair Value of Plan Assets:        
Fair value of plan assets at beginning of year   1,643 2,106  
Actual return on plan assets   201 (349)  
Employer contributions   65 78  
Plan participants’ contributions   4 3  
Gross benefits paid   (46) (45)  
Foreign currency exchange rate changes   64 (144)  
Curtailments and settlements   (38) (6)  
Other   0 0  
Fair value of plan assets at end of year   1,893 1,643 2,106
Postemployment Retirement Benefits | United States        
Benefit Obligations:        
Projected benefit obligation at beginning of year   2,016 2,592  
Service cost   20 30 28
Interest cost   116 83 81
Gross benefits paid   (265) (268)  
Plan participants’ contributions   34 31  
Plan amendments   0 0  
Actuarial (gain)/loss   53 (452)  
Foreign currency exchange rate changes   0 0  
Curtailments and settlements   0 0  
Other   0 0  
Projected benefit obligation at end of year   1,974 2,016 2,592
Fair Value of Plan Assets:        
Fair value of plan assets at beginning of year   215 115  
Actual return on plan assets   (8) (15)  
Employer contributions   122 352  
Plan participants’ contributions   34 31  
Gross benefits paid   (265) (268)  
Foreign currency exchange rate changes   0 0  
Curtailments and settlements   0 0  
Other   0 0  
Fair value of plan assets at end of year   $ 98 $ 215 $ 115