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Debt, Summary of Interest and Debt Expense, Net (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Summary of interest and debt expense, net [Abstract]      
Interest on debt $ 43 $ 44  
Amortization of deferred debt issuance costs and discounts on debt 3 3  
Capitalized interest (1) (1)  
Other 1 0  
Total interest and debt expense, net 46 $ 46  
Deferred debt issuance costs 33   $ 36
UBS Revolver [Member]      
Summary of interest and debt expense, net [Abstract]      
Deferred debt issuance costs 3   4
ABSA Revolver [Member]      
Summary of interest and debt expense, net [Abstract]      
Deferred debt issuance costs $ 3   $ 4