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Long-term Employee Benefits (Amounts Recognized in Accumulated Other Comprehensive Loss) (Details) - Pension Plan [Member] - Foreign [Member] - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Net loss $ 143 $ 151 $ 419
Prior service credit (12) (14) (10)
Total amount recognized in accumulated other comprehensive loss $ 131 $ 137 $ 409