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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, 2019
Dec. 31, 2018
Pension plans with projected benefit obligation in excess of plan assets    
Projected benefit obligation $ 178 $ 177
Accumulated benefit obligation 150 149
Fair value of plan assets 111 103
Pension plans with accumulated benefit obligation in excess of plan assets    
Projected benefit obligation 178 177
Accumulated benefit obligation 150 149
Fair value of plan assets $ 111 $ 103