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Pension and Other Postretirement Benefit Plans - Obligation and Funded Status (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Other Postretirement Benefits      
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets January 1 $ 947 $ 1,292  
Actual return on plan assets 115 (306)  
Company contributions 74 46  
Effects of exchange rate changes 0 0  
Benefits paid (95) (90)  
Settlements (2) 0  
Other 6 5  
Fair value of plan assets December 31 1,045 947 $ 1,292
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Benefit obligation January 1 1,157 1,541  
Service cost 32 48 48
Interest cost 63 46 45
Actuarial losses (gains) (58) (392)  
Benefits paid (95) (90)  
Effects of exchange rate changes 1 (1)  
Plan amendments 0 0  
Curtailments 0 0  
Termination benefits 0 0 37
Settlements (2) 0  
Other 6 5  
Benefit obligation December 31 1,104 1,157 1,541
Funded status December 31 (59) (210)  
Recognized as:      
Other Assets 107 0  
Accrued and other current liabilities (8) (8)  
Other Noncurrent Liabilities (158) (202)  
United States | Pension Benefits      
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets January 1 9,094 13,067  
Actual return on plan assets 1,077 (3,129)  
Company contributions 307 293  
Effects of exchange rate changes 0 0  
Benefits paid (497) (219)  
Settlements (177) (918)  
Other 0 0  
Fair value of plan assets December 31 9,804 9,094 13,067
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Benefit obligation January 1 9,854 13,999  
Service cost 326 372 403
Interest cost 526 457 404
Actuarial losses (gains) 403 (3,851)  
Benefits paid (497) (219)  
Effects of exchange rate changes 0 0  
Plan amendments 0 0  
Curtailments 8 12  
Termination benefits 3 2 56
Settlements (177) (918)  
Other 0 0  
Benefit obligation December 31 10,446 9,854 13,999
Funded status December 31 (642) (760)  
Recognized as:      
Other Assets 0 5  
Accrued and other current liabilities (49) (59)  
Other Noncurrent Liabilities (593) (706)  
International | Pension Benefits      
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets January 1 8,473 12,195  
Actual return on plan assets 832 (2,793)  
Company contributions 249 155  
Effects of exchange rate changes 283 (848)  
Benefits paid (256) (250)  
Settlements (53) (16)  
Other 34 30  
Fair value of plan assets December 31 9,562 8,473 12,195
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Benefit obligation January 1 7,755 11,575  
Service cost 196 283 328
Interest cost 299 145 123
Actuarial losses (gains) 766 (3,283)  
Benefits paid (256) (250)  
Effects of exchange rate changes 288 (732)  
Plan amendments 14 4  
Curtailments (1) 0  
Termination benefits 0 1 5
Settlements (53) (16)  
Other 34 28  
Benefit obligation December 31 9,042 7,755 $ 11,575
Funded status December 31 520 718  
Recognized as:      
Other Assets 1,019 1,052  
Accrued and other current liabilities (19) (19)  
Other Noncurrent Liabilities $ (480) $ (315)