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Retirement Programs - Plans Where the ABO Exceeds Plan Assets Fair Value (Details) - Pensions - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
U.S.    
Defined Benefit Plan Disclosure [Line Items]    
Accumulated benefit obligation ("ABO") $ 2,518 $ 2,464
Fair value of plan assets 2,180 2,048
International    
Defined Benefit Plan Disclosure [Line Items]    
Accumulated benefit obligation ("ABO") 8,694 7,664
Fair value of plan assets $ 6,254 $ 5,849