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Related Party Transactions (Details) (Oxy, USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Oxy
         
Related party transaction          
Related party ownership of general partner interest (as a percent) 35.00%   35.00%    
Revenues $ 424 $ 597 $ 694 $ 1,051  
Purchases and related costs 214 130 375 278  
Trade accounts receivable and other receivables, gross 276   276   231
Accounts payable, gross $ 192   $ 192   $ 129