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Pension and Other Postretirement Benefit Plans - Components of Other Comprehensive Income (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Other Postretirement Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Net loss amortization included in benefit cost $ 112 $ 186 $ 170
Prior service (cost) credit arising during the period (11) 2 (31)
Total 101 188 139
Net loss amortization included in benefit cost (10) 1 1
Prior service credit amortization included in benefit cost (78) (84) (98)
Total (88) (83) (97)
United States | Pension Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Net loss amortization included in benefit cost (816) (397) (19)
Prior service (cost) credit arising during the period (4) (4) (13)
Total (820) (401) (32)
Net loss amortization included in benefit cost 151 232 180
Prior service credit amortization included in benefit cost (49) (50) (53)
Total 102 182 127
International | Pension Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Net loss amortization included in benefit cost (227) (505) 309
Prior service (cost) credit arising during the period (1) (10) 22
Total (228) (515) 331
Net loss amortization included in benefit cost 64 84 98
Prior service credit amortization included in benefit cost (12) (13) (11)
Total $ 52 $ 71 $ 87