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Pension and Other Postretirement Benefit Plans (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Other Postretirement Benefit Plans    
Defined Benefit Plan Disclosure [Line Items]    
Service cost $ 13 $ 13
Interest cost 11 14
Expected return on plan assets (20) (19)
Amortization of unrecognized prior service credit (25) (22)
Net periodic benefit cost (21) (14)
U.S. | Pension Plans    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 100 86
Interest cost 96 109
Expected return on plan assets (188) (194)
Amortization of unrecognized prior service credit (10) (12)
Net loss amortization 85 75
Termination benefits 1 3
Curtailments 7 2
Net periodic benefit cost 91 69
International | Pension Plans    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 93 74
Interest cost 29 34
Expected return on plan assets (104) (103)
Amortization of unrecognized prior service credit (4) (3)
Net loss amortization 41 31
Termination benefits 0 1
Curtailments 0 (1)
Net periodic benefit cost $ 55 $ 33