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Investments In Marketable Securities (Tables)
12 Months Ended
Dec. 31, 2015
Investments, Debt and Equity Securities [Abstract]  
Pre-Tax Gains And Losses On Available For Sale And Trading Securities
The following table summarizes the gross proceeds from sale of AFS securities in millions for the years ended December 31, 2015, 2014, and 2013:
 
 
2015
 
2014
 
2013
Gross proceeds from sales of AFS securities
 
$
4,902

 
$
4,569

 
$
4,406