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Pension and Other Postretirement Benefit Plans - Components of Other Comprehensive Income (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Other Postretirement Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Net loss amortization included in benefit cost $ 186 $ 170 $ (45)
Prior service (cost) credit arising during the period 2 (31) (19)
Total 188 139 (64)
Net loss amortization included in benefit cost 1 1 3
Prior service (credit) cost amortization included in benefit cost (84) (98) (106)
Total (83) (97) (103)
United States | Pension Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Net loss amortization included in benefit cost (397) (19) (743)
Prior service (cost) credit arising during the period (4) (13) (10)
Total (401) (32) (753)
Net loss amortization included in benefit cost 232 180 119
Prior service (credit) cost amortization included in benefit cost (50) (53) (55)
Total 182 127 64
International | Pension Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Net loss amortization included in benefit cost (505) 309 (380)
Prior service (cost) credit arising during the period (10) 22 (2)
Total (515) 331 (382)
Net loss amortization included in benefit cost 84 98 87
Prior service (credit) cost amortization included in benefit cost (13) (11) (11)
Total $ 71 $ 87 $ 76