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Commitments And Contingencies (Financing Commitments) (Details) - Financing Commitment [Member] - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
Financing Commitments [Line Items]    
October through December 2018 $ 326  
2018 2,736  
2019 3,559  
2020 2,796  
2021 1,567  
Thereafter 8,760  
Total 19,744 $ 10,221
External Credit Rating, Non Investment Grade [Member]    
Financing Commitments [Line Items]    
Total $ 18,540