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Pension and Other Postretirement Benefit Plans - Accumulated and Projected Benefit Obligation in Excess of Plan Assets (Details) - Pension Benefits - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
United States    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Pension plans with a projected benefit obligation in excess of plan assets, projected benefit obligation $ 14,613 $ 13,003
Pension plans with a projected benefit obligation in excess of plan assets, fair value of plan assets 12,672 11,361
Pension plans with an accumulated benefit obligation in excess of plan assets, accumulated benefit obligation 13,489 12,009
Pension plans with an accumulated benefit obligation in excess of plan assets, fair value of plan assets 11,685 10,484
International    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Pension plans with a projected benefit obligation in excess of plan assets, projected benefit obligation 8,951 7,421
Pension plans with a projected benefit obligation in excess of plan assets, fair value of plan assets 7,526 6,135
Pension plans with an accumulated benefit obligation in excess of plan assets, accumulated benefit obligation 4,288 2,476
Pension plans with an accumulated benefit obligation in excess of plan assets, fair value of plan assets $ 3,033 $ 1,501