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Commitments And Contingencies (Financing Commitments) (Details) - Financing Commitment [Member] - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Financing Commitments [Line Items]    
July through December 2019 $ 873  
2018 3,143  
2019 2,994  
2020 1,350  
2021 2,134  
Thereafter 3,783  
Total 14,277 $ 19,462
External Credit Rating, Non Investment Grade [Member]    
Financing Commitments [Line Items]    
Total $ 14,122