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Related Party Transactions (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Significant transactions with related parties        
Related Party Revenue $ 27,000,000 $ 24,000,000 $ 74,000,000 $ 83,000,000
Related Party Purchases 25,000,000 26,000,000 74,000,000 74,000,000
Operating expenses and selling, general and administrative expenses 13,000,000 16,000,000 44,000,000 42,000,000
Net interest income $ (4,000,000) $ (4,000,000) $ (11,000,000) $ (10,000,000)