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Net Interest and Other Financial Costs - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Other Income and Expenses [Abstract]        
Foreign currency gains (losses) $ (1) $ 6 $ (2) $ 10
Loss on debt extinguishment $ 0 $ 0 $ 22 $ 0