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Pensions And Other Postretirement Benefits - Components of Expense and Assumptions (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Other Postretirement Benefits Plan      
Components of expense      
Service cost $ 9 $ 16 $ 18
Interest cost 236 148 123
Expected return on plan assets 0 0 0
Amortization of net actuarial (gains) losses (23) 67 97
Curtailments, settlements and other 2 (5) (6)
Net periodic pension and OPEB (income) expense $ 224 $ 226 $ 232
Weighted-average assumptions used to determine benefit obligations(a)      
Discount rate 5.13% 5.51% 2.97%
Weighted-average assumptions used to determine net expense(a)      
Discount rate 5.48% 2.84% 2.24%
U.S. | Pension Plan      
Components of expense      
Service cost $ 173 $ 233 $ 260
Service cost 103 161  
Interest cost 2,273 1,292 1,074
Expected return on plan assets (2,922) (3,000) (3,178)
Amortization of net actuarial (gains) losses 0 18 26
Curtailments, settlements and other 126 (17) 15
Net periodic pension and OPEB (income) expense $ (350) $ (1,474) $ (1,803)
Weighted-average assumptions used to determine benefit obligations(a)      
Discount rate 5.12% 5.47% 2.78%
Weighted-average assumptions used to determine net expense(a)      
Discount rate 5.37% 2.34% 1.86%
Expected rate of return on plan assets 6.30% 5.38% 5.63%
U.S. | Pension Plan | Plan      
Weighted-average assumptions used to determine net expense(a)      
Expected rate of return on plan assets 6.30% 6.30%  
Non-U.S. | Pension Plan      
Components of expense      
Service cost $ 173 $ 157 $ 121
Service cost 161 146  
Interest cost 551 293 236
Expected return on plan assets (573) (534) (610)
Amortization of net actuarial (gains) losses 32 133 212
Curtailments, settlements and other 33 10 7
Net periodic pension and OPEB (income) expense $ 216 $ 59 $ (34)
Weighted-average assumptions used to determine benefit obligations(a)      
Discount rate 4.41% 4.85% 2.13%
Weighted-average assumptions used to determine net expense(a)      
Discount rate 5.33% 2.98% 2.38%
Expected rate of return on plan assets 5.65% 4.39% 4.67%