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Commitments And Contingencies (Financing Commitments) (Details) (Financing Commitment [Member], USD $)
In Millions, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Financing Commitment [Member]
   
Financing Commitments [Line Items]    
April through December 2014 $ 1,655  
2015 3,314  
2016 3,526  
2017 3,235  
2018 1,643  
Thereafter 4,226  
Total $ 17,599 $ 17,987