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Interest Expense, net (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Interest expense, net [1] $ 36 $ 64
Continuing Operations [Member]    
Amortization of deferred financing fees 2 4
Interest Expense, Debt 34 55
Interest expense, net 34 58
Interest Income, Money Market Deposits $ 2 $ 1
[1] (1)Includes amounts from discontinued operations.