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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, 2023
Dec. 31, 2022
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 $ 10,446 $ 9,186
Pension plans with a projected benefit obligation in excess of plan assets, fair value of plan assets 9,804 8,421
Pension plans with an accumulated benefit obligation in excess of plan assets, accumulated benefit obligation 9,700 9,081
Pension plans with an accumulated benefit obligation in excess of plan assets, fair value of plan assets 9,186 8,421
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 2,961 2,779
Pension plans with a projected benefit obligation in excess of plan assets, fair value of plan assets 2,462 2,445
Pension plans with an accumulated benefit obligation in excess of plan assets, accumulated benefit obligation 1,791 1,226
Pension plans with an accumulated benefit obligation in excess of plan assets, fair value of plan assets $ 1,336 $ 948