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Employee Benefit Plans - Summary of Change in Benefit Obligation and Plan Assets (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
U.S.      
Change in Plan Assets      
Fair value of plan assets at January 1 $ 9,919    
Employer contributions 1,164    
Fair value of plan assets at December 31 7,942 $ 9,919  
Int’l.      
Change in Plan Assets      
Fair value of plan assets at January 1 4,950    
Employer contributions 158    
Fair value of plan assets at December 31 3,286 4,950  
Pension Benefits | U.S.      
Change in Benefit Obligation      
Benefit obligation at January 1 12,966 15,166  
Service cost 432 450 $ 497
Interest cost 318 235 353
Plan participants’ contributions 0 0  
Plan amendments 40 0  
Actuarial (gain) loss (2,753) (325)  
Foreign currency exchange rate changes 0 0  
Benefits paid (1,290) (2,560)  
Acquisitions 0 0  
Curtailment 0 0  
Benefit obligation at December 31 9,713 12,966 15,166
Change in Plan Assets      
Fair value of plan assets at January 1 9,919 9,930  
Actual return on plan assets (1,851) 997  
Foreign currency exchange rate changes 0 0  
Employer contributions 1,164 1,552  
Plan participants’ contributions 0 0  
Benefits paid (1,290) (2,560)  
Fair value of plan assets at December 31 7,942 9,919 9,930
Funded status at December 31 (1,771) (3,047)  
Pension Benefits | Int’l.      
Change in Benefit Obligation      
Benefit obligation at January 1 5,351 6,307  
Service cost 83 123 130
Interest cost 137 137 175
Plan participants’ contributions 3 3  
Plan amendments 38 0  
Actuarial (gain) loss (1,559) (364)  
Foreign currency exchange rate changes (423) (85)  
Benefits paid (276) (746)  
Acquisitions 0 0  
Curtailment 0 (24)  
Benefit obligation at December 31 3,354 5,351 6,307
Change in Plan Assets      
Fair value of plan assets at January 1 4,950 5,363  
Actual return on plan assets (1,096) 166  
Foreign currency exchange rate changes (453) (35)  
Employer contributions 158 199  
Plan participants’ contributions 3 3  
Benefits paid (276) (746)  
Fair value of plan assets at December 31 3,286 4,950 5,363
Funded status at December 31 (68) (401)  
Other Benefits      
Change in Benefit Obligation      
Benefit obligation at January 1 2,489 2,650  
Service cost 43 43 38
Interest cost 60 53 71
Plan participants’ contributions 62 43  
Plan amendments 18 0  
Actuarial (gain) loss (509) (108)  
Foreign currency exchange rate changes (5) (3)  
Benefits paid (220) (189)  
Divestitures 0 0  
Curtailment 0 0  
Benefit obligation at December 31 1,938 2,489 2,650
Change in Plan Assets      
Fair value of plan assets at January 1 0 0  
Actual return on plan assets 0 0  
Foreign currency exchange rate changes 0 0  
Employer contributions 158 146  
Plan participants’ contributions 62 43  
Benefits paid (220) (189)  
Fair value of plan assets at December 31 0 0 $ 0
Funded status at December 31 $ (1,938) $ (2,489)