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Pension and Other Postretirement Benefits (Schedule of Projected Benefit Obligations in Excess of Plan Assets) (Details) - Foreign Plan - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Projected benefit obligations $ 432 $ 403
Accumulated benefit obligations 389 386
Fair value of plan assets $ 194 $ 189