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Retirement Programs - Plan Where the PBO Exceeds Plan Asset Fair Value (Details) - Pensions - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
U.S.    
Defined Contribution Plan Disclosure [Line Items]    
Projected benefit obligation ("PBO") $ 2,618 $ 2,552
Fair value of plan assets 2,180 2,048
International    
Defined Contribution Plan Disclosure [Line Items]    
Projected benefit obligation ("PBO") 8,845 7,810
Fair value of plan assets $ 6,282 $ 5,872