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Investments In Marketable Securities (Tables)
12 Months Ended
Dec. 31, 2013
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 available-for-sale securities for the years ended December 31, 2013, 2012, and 2011:
 
 
2013
 
2012
 
2011
 
 
(in millions)
Gross proceeds from sales of available-for-sale securities
 
$
4,406

 
$
6,489

 
$
6,119