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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
Sep. 30, 2012
Dec. 31, 2011
Financing Commitment [Member]
   
Other Commitments, Fiscal Year Maturity [Line Items]    
October through December 2012 $ 316  
2013 1,425  
2014 2,548  
2015 3,793  
2016 3,432  
Thereafter 6,484  
Total $ 17,998 $ 15,866