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Related Party Transactions (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Related party transaction      
Costs reimbursed to general partner $ 535 $ 419 $ 374
Oxy
     
Related party transaction      
Related party ownership of general partner interest (as a percent) 35.00%    
Revenues 1,636 2,568 2,189
Purchases and related cost 557 361 221
Trade accounts receivable and other receivables, gross 231 132  
Accounts payable, gross 129 155  
Vulcan Energy Corporation
     
Related party transaction      
Ownership interest in general partner of entity that was sold by a related party (as a percent)     50.10%
Other
     
Related party transaction      
Revenues 18    
Purchases and related cost 42 33 36
Trade accounts receivable and other receivables, gross 8 10  
Accounts payable, gross $ 4 $ 5