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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, 2019
Dec. 31, 2018
Other Commitments, Fiscal Year Maturity [Line Items]    
2016 $ 3,506  
2017 2,981  
2018 1,343  
2019 2,163  
2020 1,407  
Thereafter 1,977  
Total $ 13,377 $ 19,462