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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, 2019
Dec. 31, 2018
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 $ 13,003 $ 10,620
Pension plans with a projected benefit obligation in excess of plan assets, fair value of plan assets 11,361 9,648
Pension plans with an accumulated benefit obligation in excess of plan assets, accumulated benefit obligation 12,009 9,702
Pension plans with an accumulated benefit obligation in excess of plan assets, fair value of plan assets 10,484 8,966
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 7,421 6,251
Pension plans with a projected benefit obligation in excess of plan assets, fair value of plan assets 6,135 5,089
Pension plans with an accumulated benefit obligation in excess of plan assets, accumulated benefit obligation 2,476 5,936
Pension plans with an accumulated benefit obligation in excess of plan assets, fair value of plan assets $ 1,501 $ 5,071