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Acquisitions, Dispositions and Impairments - Dispositions (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2016
Mar. 31, 2016
Jun. 30, 2016
Disposal Group, Not Discontinued Operations | Cheyenne Pipeline LLC      
Dispositions      
Percentage of investment sold 50.00%    
Held for sale | Goodwill | Depreciation and amortization      
Dispositions      
Impairment losses   $ 15  
Held for sale | Non-core assets | Other current assets      
Dispositions      
Assets classified as held for sale $ 152   $ 152
Disposed of by sale | Depreciation and amortization      
Dispositions      
Recognized gains related to sale of assets     71
Recognized losses related to sales of assets     $ 55