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Liabilities, Commitments And Contingencies (Schedule Of Estimated Potential Funding Dates For Financing Commitments) (Details) - Financing Commitment [Member] - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
Other Commitments, Fiscal Year Maturity [Line Items]    
2016 $ 2,897  
2017 3,664  
2018 3,235  
2019 2,884  
2020 1,321  
Thereafter 2,282  
Total 16,283 $ 16,723
External Credit Rating, Non Investment Grade [Member]    
Other Commitments, Fiscal Year Maturity [Line Items]    
Total $ 15,919