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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
Mar. 31, 2013
Dec. 31, 2012
Financing Commitment [Member]
   
Other Commitments, Fiscal Year Maturity [Line Items]    
April through December 2013 $ 935  
2014 2,841  
2015 3,977  
2016 3,283  
2017 3,064  
Thereafter 3,614  
Total $ 17,714 $ 18,083