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Related Party Transactions (Narrative) (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Related Party Transaction [Line Items]        
Operating revenues and other income $ 1,883 [1] $ 2,107 [1] $ 6,119 [1] $ 6,515 [1]
Purchases 4,176 [2] 8,938 [2] 18,984 [2] 25,354 [2]
Operating expenses and selling, general and administrative expenses 32 [3] 97 [3] 175 [3] 288 [3]
Contribution of PP&E, primarily office buildings and facilities        
Noncash capital contribution of PP&E; primarily office buildings and facilities     374  
Noncash capital contribution of employee benefit liabilities; primarily related to US and UK pension plans     1,230  
Noncash capital contribution of deferred taxes associated with the employee benefit liabilities     340  
ConocoPhillips [Member]
       
Related Party Transaction [Line Items]        
Operating revenues and other income   305 381 869
Purchases   4,005 5,328 11,592
Operating expenses and selling, general and administrative expenses   $ 46 $ 70 $ 144
[1] We sold crude oil to MRC. Natural gas liquids, solvents and petrochemical feedstocks were sold to CPChem, and gas oil and hydrogen feedstocks were sold to Excel. Crude oil, blendstock and other intermediate products were sold to WRB. In addition, we charged several of our affiliates, including CPChem and MSLP, for the use of common facilities, such as steam generators, waste and water treaters and warehouse facilities.
[2] We purchased refined products from WRB. We purchased natural gas and natural gas liquids from DCP Midstream and CPChem for use in our refinery processes and other feedstocks from various affiliates. We purchased refined products from MRC. We also paid fees to various pipeline equity companies for transporting finished refined products. In addition, we paid a price upgrade to MSLP for heavy crude processing. We purchased base oils and fuel products from Excel for use in our refining and marketing businesses.
[3] We paid utility and processing fees to various affiliates.