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Commitments And Contingencies (Financing Commitments) (Details) - Financing Commitment [Member] - USD ($)
$ in Millions
Mar. 31, 2017
Dec. 31, 2016
Financing Commitments [Line Items]    
April through December 2017 $ 1,438  
2018 3,528  
2019 3,166  
2020 1,901  
2021 1,634  
Thereafter 2,400  
Total $ 14,067 $ 14,847