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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, 2020
Dec. 31, 2019
Dec. 31, 2018
U.S.      
Change in Plan Assets      
Fair value of plan assets at January 1 $ 10,177    
Employer contributions 950    
Fair value of plan assets at December 31 9,930 $ 10,177  
Int’l.      
Change in Plan Assets      
Fair value of plan assets at January 1 4,791    
Employer contributions 263    
Fair value of plan assets at December 31 5,363 4,791  
Pension Benefits | U.S.      
Change in Benefit Obligation      
Benefit obligation at January 1 14,465 11,726  
Service cost 497 406 $ 480
Interest cost 353 397 370
Plan participants’ contributions 0 0  
Plan amendments 0 0  
Actuarial (gain) loss 1,782 2,922  
Foreign currency exchange rate changes 0 0  
Benefits paid (2,045) (1,035)  
Curtailment 92 0  
Acquisitions 22 49  
Benefit obligation at December 31 15,166 14,465 11,726
Change in Plan Assets      
Fair value of plan assets at January 1 10,177 8,532  
Actual return on plan assets 848 1,548  
Foreign currency exchange rate changes 0 0  
Employer contributions 950 1,096  
Plan participants’ contributions 0 0  
Benefits paid (2,045) (1,035)  
Acquisitions 0 36  
Fair value of plan assets at December 31 9,930 10,177 8,532
Funded status at December 31 (5,236) (4,288)  
Pension Benefits | Int’l.      
Change in Benefit Obligation      
Benefit obligation at January 1 5,680 4,820  
Service cost 130 139 141
Interest cost 175 199 206
Plan participants’ contributions 3 4  
Plan amendments 0 29  
Actuarial (gain) loss 550 673  
Foreign currency exchange rate changes 158 121  
Benefits paid (368) (302)  
Curtailment (21) (3)  
Acquisitions 0 0  
Benefit obligation at December 31 6,307 5,680 4,820
Change in Plan Assets      
Fair value of plan assets at January 1 4,791 4,142  
Actual return on plan assets 500 566  
Foreign currency exchange rate changes 174 115  
Employer contributions 263 266  
Plan participants’ contributions 3 4  
Benefits paid (368) (302)  
Acquisitions 0 0  
Fair value of plan assets at December 31 5,363 4,791 4,142
Funded status at December 31 (944) (889)  
Other Benefits      
Change in Benefit Obligation      
Benefit obligation at January 1 2,520 2,430  
Service cost 38 36 42
Interest cost 71 96 94
Plan participants’ contributions 59 72  
Plan amendments 0 0  
Actuarial (gain) loss 191 125  
Foreign currency exchange rate changes (1) 2  
Benefits paid (214) (240)  
Curtailment (14) 0  
Divestitures 0 (1)  
Benefit obligation at December 31 2,650 2,520 2,430
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 155 168  
Plan participants’ contributions 59 72  
Benefits paid (214) (240)  
Divestitures 0 0  
Fair value of plan assets at December 31 0 0 $ 0
Funded status at December 31 $ (2,650) $ (2,520)