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Related Party Transactions (Details) (Oxy, USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
Oxy
     
Related party transaction      
Related party ownership of general partner interest (as a percent) 35.00%    
Revenues $ 269 $ 455  
Purchases and related costs 161 148  
Trade accounts receivable and other receivables, gross 93   231
Accounts payable, gross $ 164   $ 129