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Employee Benefit Plans - Change in Benefit Obligations and Fair Value of Plan Assets (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Pension Benefits | U.S.      
Change in Benefit Obligation      
Benefit obligation, beginning balance $ 1,478 $ 1,924  
Service cost 51 58 $ 73
Interest cost 77 62 53
Plan participant contributions 0 0  
Plan amendments 0 0  
Actuarial (gain) loss 40 (325)  
Benefits paid (121) (241)  
Divestiture 0 0  
Foreign currency exchange rate change 0 0  
Benefit obligation, ending balance 1,525 1,478 1,924
Accumulated benefit obligation 1,414 1,384  
Change in Fair Value of Plan Assets      
Fair value of plan assets, beginning balance 1,179 1,664  
Actual return on plan assets 129 (319)  
Company contributions 119 75  
Plan participant contributions 0 0  
Benefits paid (121) (241)  
Divestiture 0 0  
Foreign currency exchange rate change 0 0  
Fair value of plan assets, ending balance 1,306 1,179 1,664
Funded Status (219) (299)  
Pension Benefits | Int’l.      
Change in Benefit Obligation      
Benefit obligation, beginning balance 2,776 4,124  
Service cost 38 47 61
Interest cost 113 77 79
Plan participant contributions 0 0  
Plan amendments 0 0  
Actuarial (gain) loss 11 (847)  
Benefits paid (124) (144)  
Divestiture 0 (56)  
Foreign currency exchange rate change 52 (425)  
Benefit obligation, ending balance 2,866 2,776 4,124
Accumulated benefit obligation 2,642 2,542  
Change in Fair Value of Plan Assets      
Fair value of plan assets, beginning balance 2,879 4,812  
Actual return on plan assets 199 (1,372)  
Company contributions 58 96  
Plan participant contributions 0 1  
Benefits paid (124) (144)  
Divestiture 0 (46)  
Foreign currency exchange rate change 73 (468)  
Fair value of plan assets, ending balance 3,085 2,879 4,812
Funded Status 219 103  
Other Benefits      
Change in Benefit Obligation      
Benefit obligation, beginning balance 102 137  
Service cost 1 1 2
Interest cost 5 4 4
Plan participant contributions 14 16  
Plan amendments 0 9  
Actuarial (gain) loss 22 (27)  
Benefits paid (37) (38)  
Divestiture 0 0  
Foreign currency exchange rate change 0 0  
Benefit obligation, ending balance 107 102 137
Change in Fair Value of Plan Assets      
Fair value of plan assets, beginning balance 0 0  
Actual return on plan assets 0 0  
Company contributions 23 22  
Plan participant contributions 14 16  
Benefits paid (37) (38)  
Divestiture 0 0  
Foreign currency exchange rate change 0 0  
Fair value of plan assets, ending balance 0 0 $ 0
Funded Status $ (107) $ (102)