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Commitments And Contingencies (Financing Commitments) (Details) - Financing Commitment [Member] - USD ($)
$ in Millions
Sep. 30, 2019
Dec. 31, 2018
Financing Commitments [Line Items]    
October through December 2019 $ 560  
2018 3,104  
2019 2,989  
2020 1,348  
2021 2,169  
Thereafter 5,437  
Total 15,607 $ 19,462
External Credit Rating, Non Investment Grade [Member]    
Financing Commitments [Line Items]    
Total $ 15,452