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Long-term Employee Benefits (Summary of Projected Benefit Obligations and Accumulated Benefit Obligations in Excess of Plan Assets) (Details) - Pension Plan [Member] - Foreign [Member] - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Pension plans with projected benefit obligation in excess of plan assets    
Projected benefit obligation $ 175 $ 178
Accumulated benefit obligation 148 150
Fair value of plan assets 116 111
Pension plans with accumulated benefit obligation in excess of plan assets    
Projected benefit obligation 153 178
Accumulated benefit obligation 131 150
Fair value of plan assets $ 98 $ 111