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Pension and Other Postretirement Benefit Plans - Net Benefit Costs (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Other Postretirement Benefit Plans        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 8 $ 11 $ 24 $ 36
Interest cost 16 11 47 34
Expected return on plan assets (16) (21) (48) (64)
Amortization of unrecognized prior service (credit) cost (12) (14) (37) (42)
Net (gain) loss amortization (11) (11) (31) (32)
Curtailments 0 0 (1) (1)
Net periodic benefit cost (15) (24) (46) (69)
U.S. | Pension Plans        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 88 91 239 289
Interest cost 130 123 396 330
Expected return on plan assets (182) (182) (553) (576)
Amortization of unrecognized prior service (credit) cost 0 (8) (1) (24)
Net (gain) loss amortization 0 10 0 122
Termination benefits 1 1 2 2
Curtailments 0 3 5 11
Settlements 0 79 26 180
Net periodic benefit cost 37 117 114 334
International | Pension Plans        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 48 66 148 213
Interest cost 76 35 225 110
Expected return on plan assets (131) (93) (390) (292)
Amortization of unrecognized prior service (credit) cost (6) (3) 5 (10)
Net (gain) loss amortization (1) 24 (2) 73
Termination benefits 0 0 0 1
Curtailments 0 0 0 0
Settlements 0 0 0 0
Net periodic benefit cost $ (14) $ 29 $ (14) $ 95