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Consolidated Statement Of Operations Parenthetical - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Operating expenses        
Selling, general and administrative, charges from affiliates $ 21 $ 23 $ 43 $ 48