v3.7.0.1
Acquisition and Divestitures Acquisition and Divestitures (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jan. 01, 2017
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Acquisition and Divestitures            
Goodwill   $ 127   $ 127   $ 117
Business Acquisition, Revenue     $ 348   $ 692  
Business Acquisition, Net Earnings     90   177  
Payments for (Proceeds from) Other Investing Activities [1]       (28) 0  
Gain (Loss) on Disposition of Property Plant Equipment   25 $ 0 [2] 25 $ (1) [2]  
North Dakota Gathering and Processing Assets [Member]            
Acquisition and Divestitures            
Business Combination, Consideration Transferred $ 705          
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Property, Plant, and Equipment       31    
Goodwill, Purchase Accounting Adjustments       4    
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Intangibles       (32)    
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Inventory       (3)    
Inventory   2   2    
Property, plant and equipment   571   571    
Intangibles [3]   122   122    
Goodwill   10   10    
Total purchase price   705   $ 705    
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life       10 years 7 months 6 days    
Amortization of Intangible Assets   3   $ 7    
Business Acquisition, Revenue   97   196    
Business Acquisition, Net Earnings   $ 13   $ 26    
[1] (a)Adjusted to include the historical results of the Predecessors. See Note 1 for further discussion.
[2] Adjusted to include the historical results of the Predecessors. See Note 1 for further discussion.
[3] The intangibles consist of customer contracts with a weighted average amortization period of 10.6 years. Amortization of intangible assets for the three and six months ended June 30, 2017 was $3 million and $7 million, respectively.