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Investments in Affiliates Transactions with Affiliates (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Equity Method Investments and Joint Ventures [Abstract]      
Sales to affiliates $ 7 $ 8 $ 14
Purchases from affiliates $ 38 $ 19 $ 23