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Pension and Other Postretirement Benefit Plans - Obligation and Funded Status (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Other Postretirement Benefits      
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets January 1 $ 1,102 $ 968  
Actual return on plan assets 175 203  
Company contributions 19 14  
Effects of exchange rate changes 0 0  
Benefits paid (93) (104)  
Settlements 0 0  
Other 18 21  
Fair value of plan assets December 31 1,221 1,102 $ 968
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Benefit obligation January 1 1,673 1,615  
Service cost 52 48 57
Interest cost 57 69 69
Actuarial (gains) losses (98) 21  
Benefits paid (93) (104)  
Effects of exchange rate changes (3) 1  
Plan amendments 0 0  
Curtailments (1) 0  
Termination benefits 2 5 3
Settlements 0 0  
Other 18 18  
Benefit obligation December 31 1,607 1,673 1,615
Funded status December 31 (386) (571)  
Recognized as:      
Other Assets 0 0  
Accrued and other current liabilities (9) (10)  
Other Noncurrent Liabilities (377) (561)  
United States | Pension Benefits      
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets January 1 11,361 9,648  
Actual return on plan assets 1,908 2,165  
Company contributions 199 130  
Effects of exchange rate changes 0 0  
Benefits paid (751) (582)  
Settlements (45) 0  
Other 0 0  
Fair value of plan assets December 31 12,672 11,361 9,648
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Benefit obligation January 1 13,003 10,620  
Service cost 360 293 326
Interest cost 431 458 432
Actuarial (gains) losses 1,594 2,165  
Benefits paid (751) (582)  
Effects of exchange rate changes 0 0  
Plan amendments 0 0  
Curtailments 11 18  
Termination benefits 10 31 19
Settlements (45) 0  
Other 0 0  
Benefit obligation December 31 14,613 13,003 10,620
Funded status December 31 (1,941) (1,642)  
Recognized as:      
Other Assets 0 0  
Accrued and other current liabilities (82) (92)  
Other Noncurrent Liabilities (1,859) (1,550)  
International | Pension Benefits      
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets January 1 10,163 8,580  
Actual return on plan assets 1,026 1,505  
Company contributions 387 262  
Effects of exchange rate changes 746 31  
Benefits paid (215) (230)  
Settlements (117) (12)  
Other 59 27  
Fair value of plan assets December 31 12,049 10,163 8,580
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Benefit obligation January 1 10,612 9,083  
Service cost 301 238 238
Interest cost 137 177 178
Actuarial (gains) losses 1,036 1,313  
Benefits paid (215) (230)  
Effects of exchange rate changes 794 4  
Plan amendments (64) 1  
Curtailments (8) 3  
Termination benefits 3 8 2
Settlements (117) (12)  
Other 55 27  
Benefit obligation December 31 12,534 10,612 $ 9,083
Funded status December 31 (485) (449)  
Recognized as:      
Other Assets 941 837  
Accrued and other current liabilities (13) (18)  
Other Noncurrent Liabilities $ (1,413) $ (1,268)