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Related Party Transactions (Details) - USD ($)
$ in Millions
12 Months Ended
Nov. 14, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
BridgeTex Pipeline Company, LLC        
Related Party Transactions        
Ownership interest (as a percent)   50.00%    
BridgeTex Pipeline Company, LLC | Oxy        
Related Party Transactions        
Interest acquired (as a percent) 50.00%      
General Partner        
Related Party Transactions        
Costs reimbursed to general partner   $ 648 $ 598 $ 567
Oxy        
Related Party Transactions        
Related party ownership of general partner interest (as a percent)   13.00%    
Revenues   $ 866 1,212 1,309
Purchases and related costs   41 925 863
Trade accounts receivable and other receivables, gross   405 489  
Accounts payable, gross   363 441  
Equity Method Investees        
Related Party Transactions        
Revenues   17 3 33
Costs related to services utilized   164 75 $ 79
Trade accounts receivable and other receivables, gross   14    
Accounts payable, gross   $ 25 6  
Equity Method Investees | Maximum        
Related Party Transactions        
Trade accounts receivable and other receivables, gross     $ 1  
Equity Method Investees | Agreement to Transport Crude Oil        
Related Party Transactions        
Ownership interest (as a percent)   50.00%