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Related Party Transactions (Purchases From Related Parties) (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Related Party Transaction [Line Items]        
Purchases from related parties $ 57 $ 981 $ 120 $ 1,766
Centennial [Member]
       
Related Party Transaction [Line Items]        
Purchases from related parties   18 9 31
LOOP [Member]
       
Related Party Transaction [Line Items]        
Purchases from related parties 9 23 21 32
TAME [Member]
       
Related Party Transaction [Line Items]        
Purchases from related parties 30 39 60 71
TACE [Member]
       
Related Party Transaction [Line Items]        
Purchases from related parties 10 15 15 27
Other Equity Method Investees [Member]
       
Related Party Transaction [Line Items]        
Purchases from related parties 8 9 15 15
Marathon Oil Companies [Member]
       
Related Party Transaction [Line Items]        
Purchases from related parties   $ 877   $ 1,590