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Related Party Transactions (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Significant transactions with related parties        
Related Party Revenue $ 26 $ 24 $ 47 $ 47
Related Party Purchases 17 25 38 49
Operating expenses and selling, general and administrative expenses 14 16 28 31
Net interest income $ (3) $ (4) $ (7) $ (7)