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Pension and Other Postretirement Benefit Plans (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Other Postretirement Benefit Plans    
Defined Benefit Plan Disclosure [Line Items]    
Service cost $ 13 $ 12
Interest cost 14 17
Expected return on plan assets (19) (18)
Amortization of unrecognized prior service credit (22) (21)
Net periodic benefit cost (14) (10)
U.S. | Pension Plans    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 86 71
Interest cost 109 114
Expected return on plan assets (194) (206)
Amortization of unrecognized prior service credit (12) (12)
Net loss amortization 75 35
Termination benefits 3 2
Curtailments 2 0
Net periodic benefit cost 69 4
International | Pension Plans    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 74 60
Interest cost 34 45
Expected return on plan assets (103) (108)
Amortization of unrecognized prior service credit (3) (3)
Net loss amortization 31 16
Termination benefits 1 0
Curtailments (1) 0
Net periodic benefit cost $ 33 $ 10