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Pension and Other Postretirement Benefit Plans - Components of Net Periodic Benefit Cost (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Other Postretirement Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Service cost $ 32 $ 48 $ 48
Interest cost 63 46 45
Expected return on plan assets (64) (86) (79)
Amortization of unrecognized prior service (credit) cost (49) (57) (63)
Net loss (gain) amortization (42) (43) (42)
Termination benefits 0 0 37
Curtailments (1) (1) (29)
Settlements 0 0 0
Net periodic benefit cost (credit) (61) (93) (83)
United States | Pension Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 326 372 403
Interest cost 526 457 404
Expected return on plan assets (735) (753) (755)
Amortization of unrecognized prior service (credit) cost (1) (32) (38)
Net loss (gain) amortization 0 128 298
Termination benefits 3 2 56
Curtailments 8 12 16
Settlements 28 239 216
Net periodic benefit cost (credit) 155 425 600
International | Pension Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 196 283 328
Interest cost 299 145 123
Expected return on plan assets (517) (383) (416)
Amortization of unrecognized prior service (credit) cost 2 (14) (16)
Net loss (gain) amortization (3) 96 142
Termination benefits 0 1 5
Curtailments (1) 0 (26)
Settlements (5) 1 8
Net periodic benefit cost (credit) $ (29) $ 129 $ 148