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Long-term Employee Benefits (Change in Benefit Obligation and Plan Assets) (Details) - Pension Plan [Member] - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Employer contributions $ 20 $ 19 $ 15
Foreign [Member]      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Benefit obligation at beginning of year 507 1,168  
Service cost 15 13 14
Interest cost 6 17 16
Plan participants’ contributions 2 2  
Actuarial loss 33 313  
Benefits paid (2) (37)  
Plan amendments   (5)  
Settlements and transfers (24) (945)  
Currency translation 47 (19)  
Benefit obligation at end of year 584 507 1,168
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets at beginning of year 500 1,268  
Actual return on plan assets 55 217  
Employer contributions 20 19  
Plan participants’ contributions 2 2  
Benefits paid (2) (37)  
Settlements and transfers (21) (945)  
Currency translation 50 (24)  
Fair value of plan assets at end of year 604 500 $ 1,268
Total funded status at end of year $ 20 $ (7)