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Contingencies And Commitments (Schedule Of Aggregate Undiscounted Commitments On Gathering, Processing And Transportation Agreements) (Details) (USD $)
In Millions
Jun. 30, 2011
Contingencies And Commitments  
2011 $ 440
2012 1,017
2013 1,153
2014 1,150
2015 1,195
2015 - 2099 6,767
Total $ 11,722