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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, 2019
Dec. 31, 2018
Dec. 31, 2017
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Employer contributions $ 19 $ 15 $ 38
Foreign [Member]      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Benefit obligation at beginning of year 1,168 1,177  
Service cost 13 14 16
Interest cost 17 16 16
Plan participants’ contributions 2 2  
Actuarial loss 313 45  
Benefits paid (37) (46)  
Plan amendments (5)    
Settlements and transfers (945) 2  
Currency translation (19) (42)  
Benefit obligation at end of year 507 1,168 1,177
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets at beginning of year 1,268 1,363  
Actual return (loss) on plan assets 217 (17)  
Employer contributions 19 15  
Plan participants’ contributions 2 2  
Benefits paid (37) (46)  
Settlements and transfers (945) 2  
Currency translation (24) (51)  
Fair value of plan assets at end of year 500 1,268 $ 1,363
Total funded status at end of year $ (7) $ 100