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Pension and Other Postretirement Benefit Plans - Components of Other Comprehensive Income (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Other Postretirement Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Net loss amortization included in benefit cost $ 170 $ (45) $ 209
Prior service (cost) credit arising during the period (31) (19) 511
Total 139 (64) 720
Net loss amortization included in benefit cost 1 3 5
Prior service (credit) cost amortization included in benefit cost (98) (106) (64)
Total (97) (103) (59)
United States | Pension Plan      
Defined Benefit Plan Disclosure [Line Items]      
Net loss amortization included in benefit cost (19) (743) 73
Prior service (cost) credit arising during the period (13) (10) (13)
Total (32) (753) 60
Net loss amortization included in benefit cost 180 119 214
Prior service (credit) cost amortization included in benefit cost (53) (55) (56)
Total 127 64 158
International | Pension Plan      
Defined Benefit Plan Disclosure [Line Items]      
Net loss amortization included in benefit cost 309 (380) (66)
Prior service (cost) credit arising during the period 22 (2) (4)
Total 331 (382) (70)
Net loss amortization included in benefit cost 98 87 118
Prior service (credit) cost amortization included in benefit cost (11) (11) (14)
Total $ 87 $ 76 $ 104