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Pension and Other Postretirement Benefit Plans - Net Benefit Costs (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Other Postretirement Benefit Plans        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 12 $ 13 $ 25 $ 26
Interest cost 11 11 23 22
Expected return on plan assets (21) (20) (43) (39)
Amortization of unrecognized prior service credit (25) (25) (50) (50)
Termination benefits 0 37 0 37
Curtailments 0 (27) 0 (28)
Net periodic benefit cost (23) (11) (45) (32)
U.S. | Pension Plans        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 99 98 198 198
Interest cost 103 106 206 202
Expected return on plan assets (197) (191) (393) (379)
Amortization of unrecognized prior service credit (8) (11) (16) (20)
Net loss amortization 56 58 112 142
Termination benefits 1 52 1 53
Curtailments 4 9 8 16
Settlements 101 0 101 0
Net periodic benefit cost 159 121 217 212
International | Pension Plans        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 72 87 147 179
Interest cost 37 30 75 59
Expected return on plan assets (98) (104) (199) (209)
Amortization of unrecognized prior service credit (3) (4) (7) (9)
Net loss amortization 25 38 50 78
Termination benefits 0 2 0 3
Curtailments 0 (27) 0 (27)
Settlements 0 2 0 2
Net periodic benefit cost $ 33 $ 24 $ 66 $ 76