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Long-term Employee Benefits (Cash Flows Defined Benefit Plans) (Details) - USD ($)
$ in Millions
1 Months Ended 12 Months Ended
Oct. 31, 2017
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Defined Benefit Plan, Expected Future Benefit Payments, Fiscal Year Maturity [Abstract]        
2020   $ 13    
2021   9    
2022   10    
2023   13    
2024   15    
2025 to 2029   87    
Pension Plan [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Contributions by employer   $ 19 $ 15 $ 38
Estimated future employer contributions in next fiscal year     $ 18  
U.S. Pension Restoration Plan [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Contributions by employer       $ 10
Cash payment to settle remaining liability $ 10