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Commitments And Contingencies (Schedule Of Estimated Potential Funding Dates For Financing Commitments) (Details) (USD $)
In Millions
Sep. 30, 2011
Dec. 31, 2010
Commitments And Contingencies [Abstract]  
October through December 2011$ 202 
20121,483 
20131,786 
20142,872 
20153,319 
Thereafter5,962 
Total$ 15,624$ 9,865