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Consolidated Statement Of Operations Parenthetical - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Operating expenses        
Selling, general and administrative, charges from affiliates $ 20 $ 21 $ 62 $ 69