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Pension and Other Postretirement Benefit Plans - Components of Other Comprehensive Income (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Other Postretirement Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Net loss (gain) amortization included in benefit cost $ 198 $ 112 $ 186
Prior service (cost) credit arising during the period (3) (11) 2
Total 195 101 188
Net loss (gain) amortization included in benefit cost (18) (10) 1
Prior service credit amortization included in benefit cost (73) (78) (84)
Total (91) (88) (83)
United States | Pension Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Net loss (gain) amortization included in benefit cost (448) (816) (397)
Prior service (cost) credit arising during the period (1) (4) (4)
Total (449) (820) (401)
Net loss (gain) amortization included in benefit cost 303 151 232
Prior service credit amortization included in benefit cost (49) (49) (50)
Total 254 102 182
International | Pension Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Net loss (gain) amortization included in benefit cost (407) (227) (505)
Prior service (cost) credit arising during the period 62 (1) (10)
Total (345) (228) (515)
Net loss (gain) amortization included in benefit cost 127 64 84
Prior service credit amortization included in benefit cost (18) (12) (13)
Total $ 109 $ 52 $ 71