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Investments In Marketable Securities (Tables)
3 Months Ended
Mar. 31, 2012
Investments In Marketable Securities Tables [Abstract]  
Marketable Securities By Type Table
   March 31, 2012 December 31, 2011
   Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total
                          
   (in millions)
AVAILABLE-FOR-SALE:(1)                        
Debt securities:                        
 Unsecured debentures(2) $ - $ 975 $ - $ 975 $ - $ 665 $ - $ 665
 Certificates of deposit(2)   -   645   -   645   -   576   -   576
 Government debt securities   -   28   -   28   -   31   -   31
 Subtotal    -   1,648   -   1,648   -   1,272   -   1,272
Equity securities:                        
 Mutual funds   1   67   -   68   -   67   -   67
 Common stock   1   -   -   1   1   -   -   1
 Subtotal    2   67   -   69   1   67   -   68
Total available-for-sale   2   1,715   -   1,717   1   1,339   - $ 1,340
TRADING:                        
Equity securities:                        
 Mutual funds   12   -   -   12   12   -   -   12
Total trading   12   -   -   12   12   -   -   12
TOTAL  $ 14 $ 1,715 $ - $ 1,729 $ 13 $ 1,339 $ - $ 1,352
                          
Held-to-maturity securities            11            4
Total marketable securities          $ 1,740          $ 1,356
Pre-Tax Gains And Losses On Available For Sale And Trading Securities
   Three Months Ended
   March 31,
   2012 2011
        
   (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 included in other      
  comprehensive income   -   (2)
Proceeds from sales of available-for-sale securities   1,523   1,237
Gross realized gains on sales   1   1