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Acquisitions and Dispositions - Dispositions and Divestitures (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dispositions    
Proceeds from sales of assets $ 161 $ 246
Disposed of by sale    
Dispositions    
Proceeds from sales of assets 161  
Held for sale | Depreciation and amortization    
Dispositions    
Impairment related to assets held for sale 31  
Held for sale | Other current assets    
Dispositions    
Assets classified as held for sale $ 490  
Red River Pipeline    
Dispositions    
Interest percentage disposed of 40.00%  
Red River Pipeline, Hewitt Segment    
Dispositions    
Interest retained after disposal 60.00%  
Red River Pipeline from Ardmore to Longview    
Dispositions    
Interest retained after disposal 100.00%  
Non-Core Pipeline Segment | Disposed of by sale | Depreciation and amortization    
Dispositions    
Recognized gains/(losses) related to sales of assets, net $ 36