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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, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Other Postretirement Benefit Plans        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 11 $ 11 $ 36 $ 37
Interest cost 11 12 34 34
Expected return on plan assets (21) (20) (64) (59)
Amortization of unrecognized prior service credit (14) (16) (42) (48)
Net loss amortization (11) (12) (32) (30)
Termination benefits 0 0 0 37
Curtailments 0 (1) (1) (29)
Net periodic benefit cost (24) (26) (69) (58)
U.S. | Pension Plans        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 91 104 289 302
Interest cost 123 102 330 305
Expected return on plan assets (182) (188) (576) (568)
Amortization of unrecognized prior service credit (8) (9) (24) (29)
Net loss amortization 10 75 122 218
Termination benefits 1 2 2 54
Curtailments 3 (1) 11 15
Settlements 79 139 180 139
Net periodic benefit cost 117 224 334 436
International | Pension Plans        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 66 75 213 254
Interest cost 35 33 110 92
Expected return on plan assets (93) (105) (292) (313)
Amortization of unrecognized prior service credit (3) (3) (10) (12)
Net loss amortization 24 32 73 110
Termination benefits 0 0 1 3
Curtailments 0 0 0 (27)
Settlements 0 0 0 2
Net periodic benefit cost $ 29 $ 32 $ 95 $ 109