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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, 2020
Dec. 31, 2019
Other Commitments, Fiscal Year Maturity [Line Items]    
2016 $ 2,329  
2017 2,384  
2018 1,677  
2019 1,677  
2020 1,827  
Thereafter 1,618  
Total 11,512 $ 13,377
External Credit Rating, Non Investment Grade [Member]    
Other Commitments, Fiscal Year Maturity [Line Items]    
Total $ 11,512