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Related Party Transactions Related Party Revenue (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Related Party Transactions [Abstract]        
Revenue from Related Parties $ 103 $ 105 $ 325 $ 201