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Acquisitions and Dispositions - Dispositions and Divestitures (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2017
Sep. 30, 2016
Dispositions      
Proceeds from sales of assets   $ 407 $ 638
Disposed of by sale      
Dispositions      
Proceeds from sales of assets   407  
Disposed of by sale | Depreciation and amortization      
Dispositions      
Recognized losses related to sales of assets, net $ 15 15  
Gain on sale of assets 5 42  
Losses on sale of assets 20 57  
Held for sale | Other current assets      
Dispositions      
Assets classified as held for sale $ 630 $ 630  
Red River Pipeline      
Dispositions      
Interest percentage disposed of   40.00%  
Red River Pipeline Hewitt Segment      
Dispositions      
Interest percentage retained after disposal   60.00%  
Red River Pipeline from Ardmore to Longview      
Dispositions      
Interest percentage retained after disposal   100.00%