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Commitments And Contingencies (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Commitments And Contingencies [Abstract]      
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 $ 64us-gaap_LeaseAndRentalExpense $ 26us-gaap_LeaseAndRentalExpense $ 42us-gaap_LeaseAndRentalExpense