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Commitments And Contingencies (Financing Commitments) (Details) - Financing Commitment [Member] - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Financing Commitments [Line Items]    
April through December 2019 $ 981  
2018 3,429  
2019 3,087  
2020 1,784  
2021 3,261  
Thereafter 5,723  
Total 18,265 $ 19,462
External Credit Rating, Non Investment Grade [Member]    
Financing Commitments [Line Items]    
Total $ 18,012