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Related Party Transactions (Details) (Oxy, USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Dec. 31, 2011
Oxy
     
Related party transaction      
Related party ownership of general partner interest (as a percent) 35.00%    
Revenues $ 455 $ 702  
Purchases and related cost 148 74  
Trade accounts receivable and other receivables, gross 147   132
Accounts payable, gross $ 171   $ 155