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Commitments And Contingencies (Financing Commitments) (Details) - Financing Commitment [Member] - USD ($)
$ in Millions
Sep. 30, 2017
Dec. 31, 2016
Financing Commitments [Line Items]    
October through December 2017 $ 305  
2018 3,439  
2019 3,437  
2020 1,862  
2021 1,585  
Thereafter 2,478  
Total $ 13,106 $ 14,847