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Goodwill and Intangible Assets (Intangible Assets) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]      
Gross $ 559 $ 631  
Accumulated amortization (89) (56)  
Net 470 575  
Amortization expense 41 40 $ 31
Amortization expense, 2017 41    
Amortization expense, 2018 41    
Amortization expense, 2019 41    
Amortization expense, 2020 41    
Amortization expense, 2021 41    
Customer relationships [Member]      
Finite-Lived Intangible Assets [Line Items]      
Gross 375 410  
Accumulated amortization (71) (46)  
Net 304 364  
Long term supply contacts [Member]      
Finite-Lived Intangible Assets [Line Items]      
Gross 184 221  
Accumulated amortization (18) (10)  
Net 166 211  
Other intangible assets [Member]      
Finite-Lived Intangible Assets [Line Items]      
Net $ 3 $ 2