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Acquisition (Schedule of Purchase Price Allocation) (Details) - USD ($)
$ in Millions
Mar. 31, 2017
Dec. 31, 2016
Oct. 01, 2016
Assets      
Goodwill $ 2,292 $ 2,286  
Midstream Natural Gas Assets      
Assets      
Cash     $ 83
Accounts receivable     24
Inventory     6
Property, plant, and equipment, net     730
Goodwill     268
Customer relationship intangibles     770
Other current assets     1
Total assets     1,882
Liabilities      
Accounts payable     19
Other current liabilities     14
Long-term debt     204
Other long-term liabilities     26
Total liabilities     263
Less noncontrolling interest     390
Total cash consideration     $ 1,229