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Net Interest and Other Financial Costs - Additional Information (Details) - USD ($)
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Debt Disclosure [Abstract]    
Net foreign currency remeasurement gains (losses) (less than for three months ended March 31, 2015) $ (4,000,000) $ 5,000,000
Loss on debt extinguishment $ 46,000,000 $ 0