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Related-Party Transactions (Details) - USD ($)
6 Months Ended 12 Months Ended
Dec. 31, 2016
Jul. 01, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Related Party Transaction [Line Items]          
Related Party Transaction, Expenses from Transactions with Related Party   $ 117,000,000     $ 201,000,000
Revenue from Related Parties     $ 17,000,000 $ 31,000,000 $ 38,000,000
Related Party Transaction, Purchases from Related Party $ 10,000,000   $ 13,000,000    
Corporate Overhead Allocated 0        
Related Party, License Agreement, Improvement License, Terms       2 years  
TSA Expenses [Member]          
Related Party Transaction [Line Items]          
Related Party Transaction, Expenses from Transactions with Related Party $ 13,000,000