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Investments In Marketable Securities (Tables)
3 Months Ended
Mar. 31, 2013
Investments In Marketable Securities Tables [Abstract]  
Pre-Tax Gains And Losses On Available For Sale And Trading Securities
   2013 2012
        
   (in millions)
        
Gains included in earnings that relate to trading securities       
 held at the reporting date $ 1 $ -
Unrealized gains (losses) on available-for-sale securities       
Losses reclassified out of other comprehensive income       
Gross proceeds from sales of available-for-sale securities   1,704   1,523
Gross realized gains on sales   -   1