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Debt (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Apr. 09, 2014
Debt Instrument [Line Items]      
Debt Issuance Cost   $ 1  
Short-term debt [Abstract]      
Current portion of long-term debt $ 2 3  
Other - short-term 34 34  
Short-term debt 36 37  
Long-term debt      
Long-term debt 346 346  
Revolving Credit Facility [Member]      
Long-term debt      
Debt Instrument, face amount     $ 200
Term Loan [Member]      
Long-term debt      
Unsecured long-term debt, non-current $ 345 345  
Debt Instrument, face amount     $ 350
Debt Instrument, Maturity Date Apr. 09, 2021    
Other Long-term Debt [Member]      
Long-term debt      
Other $ 1 $ 1  
Affiliated Entity [Member]      
Long-term debt      
Line of Credit Facility, Capacity Available for Trade Purchases $ 19    
Revolving Credit Facility [Member]      
Long-term debt      
Debt Instrument, Maturity Date Apr. 09, 2019