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Related Party Transactions - Significant Transactions with Related Parties (Parenthetical) (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Related Party Transaction [Line Items]      
Discontinued operations, Revenue from related parties $ 8,304 $ 7,315 $ 7,184
Before-tax gain from sale to DCP Midstream   1,149 [1]  
Before-tax gain on sale of LUKOIL shares under a stock purchase and option agreement with a wholly owned subsidiary   1,149  
Discontinued operations, Purchases from related parties 20,369 15,163 11,965
Discontinued operations, Expenses from transactions with related parties 159 106 93
Discontinued operations, Interest expense 10    
Discontinued operations, Interest income   2 10
Seaway Products Pipeline [Member]
      
Related Party Transaction [Line Items]      
Proceeds from Sale of Oil and Gas Property and Equipment 400    
Before-tax gain from sale to DCP Midstream $ 156    
[1] In 2011, we sold the Seaway Products Pipeline to DCP Midstream for cash proceeds of $400 million, resulting in a before-tax gain of $156 million, which is included in discontinued operations and excluded from the table above. During 2010, we sold a portion of our LUKOIL shares under a stock purchase and option agreement with a wholly owned subsidiary of LUKOIL, resulting in a before-tax gain of $1,149 million.