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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
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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

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