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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, 2018
Dec. 31, 2017
Other Commitments, Fiscal Year Maturity [Line Items]    
2016 $ 2,331  
2017 3,432  
2018 2,784  
2019 1,787  
2020 3,402  
Thereafter 5,726  
Total 19,462 $ 10,221
External Credit Rating, Non Investment Grade [Member]    
Other Commitments, Fiscal Year Maturity [Line Items]    
Total $ 18,785