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Investments in Unconsolidated Entities - Equity Method Investments (Details) - USD ($)
$ in Millions
1 Months Ended 12 Months Ended
Aug. 31, 2016
Jun. 30, 2016
Nov. 30, 2014
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Investments in Unconsolidated Entities            
Investments in unconsolidated entities       $ 2,343 $ 2,027 $ 1,735
Capital contributions to equity method investees excluding capitalized interest       288 245 158
Cash received as a return of investment         53  
Interest expense, capitalized interest       47 57 $ 48
Amount by which investments in unconsolidated entities exceeded our share of the underlying equity in the net assets       $ 736 760  
Oxy | BridgeTex Pipeline Company, LLC (BridgeTex)            
Investments in Unconsolidated Entities            
Interest acquired     50.00%      
Payments to acquire unconsolidated entities     $ 1,088      
Working capital adjustments     $ 13      
BridgeTex Pipeline Company, LLC (BridgeTex)            
Investments in Unconsolidated Entities            
Ownership interest       50.00%    
Investments in unconsolidated entities       $ 1,098 1,082  
Interest acquired           50.00%
BridgeTex Pipeline Company, LLC (BridgeTex) | Oxy            
Investments in Unconsolidated Entities            
Interest acquired     50.00%      
Total Investments in Unconsolidated Entities            
Investments in Unconsolidated Entities            
Ownership interest       22.00%    
Investments in unconsolidated entities       $ 11 9  
Caddo Pipeline LLC (Caddo)            
Investments in Unconsolidated Entities            
Ownership interest       50.00%    
Investments in unconsolidated entities       $ 65 28  
Cheyenne Pipeline LLC (Cheyenne)            
Investments in Unconsolidated Entities            
Ownership interest       50.00%    
Investments in unconsolidated entities       $ 30 0  
Ownership percentage sold   50.00%        
Diamond Pipeline LLC (Diamond)            
Investments in Unconsolidated Entities            
Ownership interest       50.00%    
Investments in unconsolidated entities       $ 143 38  
Eagle Ford Pipeline LLC            
Investments in Unconsolidated Entities            
Ownership interest       50.00%    
Investments in unconsolidated entities       $ 372 382  
Eagle Ford Terminals Corpus Christi LLC (Eagle Ford Terminals)            
Investments in Unconsolidated Entities            
Ownership interest       50.00%    
Investments in unconsolidated entities       $ 53 29  
Frontier Aspen LLC            
Investments in Unconsolidated Entities            
Ownership interest       50.00%    
Investments in unconsolidated entities       $ 45 48  
Saddlehorn Pipeline Company, LLC            
Investments in Unconsolidated Entities            
Ownership interest       40.00%    
Investments in unconsolidated entities       $ 213 103  
Settoon Towing, LLC            
Investments in Unconsolidated Entities            
Ownership interest       50.00%    
Investments in unconsolidated entities       $ 87 84  
STACK Pipeline LLC (STACK)            
Investments in Unconsolidated Entities            
Ownership interest       50.00%    
Investments in unconsolidated entities       $ 14 0  
Ownership percentage sold 50.00%          
White Cliffs Pipeline, LLC            
Investments in Unconsolidated Entities            
Ownership interest       36.00%    
Investments in unconsolidated entities       $ 212 224  
Equity Method Investees            
Investments in Unconsolidated Entities            
Interest expense, capitalized interest       $ 13 $ 8