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Pension and Other Postretirement Benefit Plans - Components of Net Periodic Benefit Cost (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Other Postretirement Benefit Plans        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 14 $ 14 $ 28 $ 28
Interest cost 18 20 35 40
Expected return on plan assets (21) (20) (41) (39)
Amortization of unrecognized prior service credit (21) (24) (42) (49)
Termination benefits 1 0 2 1
Curtailments (2) (2) (6) (5)
Net periodic benefit cost (11) (12) (24) (24)
U.S. | Pension Plans        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 85 77 168 154
Interest cost 107 113 215 226
Expected return on plan assets (211) (218) (425) (436)
Amortization of unrecognized prior service credit (13) (13) (25) (27)
Net loss amortization 56 44 112 89
Termination benefits 7 3 17 8
Curtailments 5 1 3 4
Settlements 0 0 1 0
Net periodic benefit cost 36 7 66 18
International | Pension Plans        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 58 63 125 124
Interest cost 45 42 91 83
Expected return on plan assets (108) (97) (221) (191)
Amortization of unrecognized prior service credit (3) (3) (7) (5)
Net loss amortization 21 24 43 47
Termination benefits 0 1 0 2
Curtailments (1) (1) (1) (1)
Settlements 4 0 4 0
Net periodic benefit cost $ 16 $ 29 $ 34 $ 59