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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, 2022
Dec. 31, 2021
Dec. 31, 2020
Pension Benefits | United States      
Change in Benefit Obligation      
Benefit obligation, beginning balance $ 1,924 $ 2,548  
Service cost 58 73 $ 85
Interest cost 62 53 66
Plan participant contributions 0 0  
Plan amendments 0 0  
Actuarial (gain) loss (325) (117)  
Benefits paid (241) (654)  
Divestiture 0 0  
Curtailment 0 12  
Recognition of termination benefits 0 9  
Foreign currency exchange rate change 0 0  
Benefit obligation, ending balance 1,478 1,924 2,548
Accumulated benefit obligation 1,384 1,793  
Change in Fair Value of Plan Assets      
Fair value of plan assets, beginning balance 1,664 1,770  
Actual return on plan assets (319) 97  
Company contributions 75 451  
Plan participant contributions 0 0  
Benefits paid (241) (654)  
Divestiture 0 0  
Foreign currency exchange rate change 0 0  
Fair value of plan assets, ending balance 1,179 1,664 1,770
Funded Status (299) (260)  
Pension Benefits | Int’l.      
Change in Benefit Obligation      
Benefit obligation, beginning balance 4,124 4,403  
Service cost 47 61 54
Interest cost 77 79 85
Plan participant contributions 0 0  
Plan amendments 0 0  
Actuarial (gain) loss (847) (176)  
Benefits paid (144) (162)  
Divestiture (56) 0  
Curtailment 0 0  
Recognition of termination benefits 0 0  
Foreign currency exchange rate change (425) (81)  
Benefit obligation, ending balance 2,776 4,124 4,403
Accumulated benefit obligation 2,542 3,658  
Change in Fair Value of Plan Assets      
Fair value of plan assets, beginning balance 4,812 4,793  
Actual return on plan assets (1,372) 147  
Company contributions 96 119  
Plan participant contributions 1 1  
Benefits paid (144) (162)  
Divestiture (46) 0  
Foreign currency exchange rate change (468) (86)  
Fair value of plan assets, ending balance 2,879 4,812 4,793
Funded Status 103 688  
Other Benefits      
Change in Benefit Obligation      
Benefit obligation, beginning balance 137 170  
Service cost 1 2 2
Interest cost 4 4 6
Plan participant contributions 16 16  
Plan amendments 9 0  
Actuarial (gain) loss (27) (16)  
Benefits paid (38) (40)  
Divestiture 0 0  
Curtailment 0 1  
Recognition of termination benefits 0 0  
Foreign currency exchange rate change 0 0  
Benefit obligation, ending balance 102 137 170
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 22 24  
Plan participant contributions 16 16  
Benefits paid (38) (40)  
Divestiture 0 0  
Foreign currency exchange rate change 0 0  
Fair value of plan assets, ending balance 0 0 $ 0
Funded Status $ (102) $ (137)