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Investments In Marketable Securities (Tables)
9 Months Ended
Sep. 30, 2015
Investments, Debt and Equity Securities [Abstract]  
Pre-Tax Gains And Losses On Available For Sale Securities
The following table summarizes the gross proceeds from sale of AFS securities for the periods indicated (in millions):
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2015
 
2014
 
2015
 
2014
Gross proceeds from sales of AFS securities
$
1,224

 
$
1,144

 
$
3,705

 
$
3,362