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Commitments And Contingencies (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Jun. 20, 2011
Issued court judgment       $ 196
Recorded liability due to court judgment 133      
Recorded receivable due to indemnification agreement 133      
Obligation related to the purchase of condensate, year of expiration 2021      
Total rental expense, including certain office space and equipment under operating lease agreements, net of sub-lease income 42 57 56  
Devon [Member]
       
Issued court judgment       $ 133