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Commitments And Contingencies (Schedule Of Estimated Potential Funding Dates For Financing Commitments) (Details) (Financing Commitment [Member], USD $)
In Millions, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Financing Commitment [Member]
   
Other Commitments, Fiscal Year Maturity [Line Items]    
July through December 2013 $ 486  
2014 2,995  
2015 3,724  
2016 3,272  
2017 3,105  
Thereafter 4,233  
Total $ 17,815 $ 18,083