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Contingencies And Commitments (Schedule Of Aggregate Undiscounted Commitments On Gathering, Processing And Transportation Agreements) (Details) (USD $)
In Millions
Sep. 30, 2011
Contingencies And Commitments [Abstract] 
2011$ 233
20121,026
20131,170
20141,168
20151,213
2016 - 20996,878
Total$ 11,688