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Investments (Tables)
12 Months Ended
Apr. 27, 2012
Investments [Abstract]  
Information Regarding Short-term and Long-term Investments
     Unrealized  Unrealized    
(in millions) Cost Gains Losses Fair Value
Available-for-sale securities:            
Corporate debt securities $ 3,501 $47 $ (7) $ 3,541
Auction rate securities   153   -   (26)   127
Mortgage-backed securities      840  9   (10)   839
U.S. government and agency securities   3,046  38   -   3,084
Foreign government and agency securities    67   -   -   67
Certificates of deposit   47   -   -   47
Other asset-backed securities      535  3   (1)   537
Marketable equity securities   100  158   (5)   253
Trading securities:            
Exchange-traded funds   45   2   (1)   46
Cost method, equity method, and other investments   508   -   -   508
Total short-term and long-term investments $ 8,842 $ 257 $ (50) $ 9,049

     Unrealized  Unrealized    
(in millions) Cost Gains Losses Fair Value
Available-for-sale securities:            
Corporate debt securities $ 1,947 $ 20 $ (6) $ 1,961
Auction rate securities   167   -   (34)   133
Mortgage-backed securities      783   10   (8)   785
U.S. government and agency securities    2,731   26   (1)   2,756
Foreign government and agency securities   130   1   -   131
Certificates of deposit   119   -   -   119
Other asset-backed securities      351   1   (3)   349
Marketable equity securities   73   164   -   237
Trading securities:            
Exchange-traded funds   33   6   -   39
Cost method, equity method, and other investments   652   -   -   652
Total short-term and long-term investments $ 6,986 $ 228 $ (52) $ 7,162
Information Regarding Available-for-sale and Trading Securities
  April 27, 2012 April 29, 2011
(in millions) Short-term Long-term Short-term Long-term
Available-for-sale securities $ 1,344 $ 7,151 $ 1,046 $ 5,425
Trading securities   -   46   -   39
Total  $ 1,344 $ 7,197 $ 1,046 $ 5,464
Gross Unrealized Losses and Fair Values of Available-for-sale Securities that Have Been in a Continuous Unrealized Loss Position Deemed to be Temporary for Less than 12 Months and for More than 12 months, Aggregated by Investment Category
  April 27, 2012
   Less than 12 months More than 12 months
     Unrealized    Unrealized
(in millions) Fair Value Losses Fair Value Losses
Corporate debt securities $ 664 $ (4) $ 16 $ (3)
Auction rate securities   -   -   127   (26)
Mortgage-backed securities      218   (2)   57   (8)
Other asset-backed securities      55   -   9   (1)
Marketable equity securities   24   (5)   -   -
Total  $ 961 $ (11) $ 209 $ (38)
             
  April 29, 2011
   Less than 12 months More than 12 months
     Unrealized    Unrealized
(in millions) Fair Value Losses Fair Value Losses
Corporate debt securities $ 256 $ (1) $ 16 $ (5)
Auction rate securities   -   -   133   (34)
Mortgage-backed securities      161   (1)   67   (7)
U.S. government and agency securities    267   (1)   -   -
Other asset-backed securities      74   (1)   12   (2)
Total  $ 758 $ (4) $ 228 $ (48)
Activity Related to Short-term and Long-term Investment Portfolio
Activity related to the Company’s short-term and long-term investment portfolio is as follows:      
                   
  Fiscal Year
  2012 2011 2010
(in millions) Debt (a) Equity (b) (c)  Debt (a) Equity (b) (d)  Debt (a) Equity (b)
Proceeds from sales $ 6,062 $ 113 $ 6,443 $ 31 $ 3,791 $ 27
Gross realized gains  $ 52 $ 93 $ 28 $ 85 $ 44 $ 10
Gross realized losses $ (16) $ - $ (15) $ - $ (6) $ -
Impairment losses recognized $ (2) $ (10) $ (5) $ (24) $ (14) $ (40)
                   
(a) Includes available-for-sale debt securities.           
(b) Includes marketable equity securities, cost method, equity method, exchange-traded funds, and other investments.
(c) As a result of the Salient and PEAK acquisitions that occurred during fiscal year 2012, the Company recognized a non-cash gain of $38 million on its previously-held minority investments.
(d) As a result of the Ardian acquisition that occurred during fiscal year 2011, the Company recognized a non-cash gain of $85 million on its previously-held minority investment.
Credit Loss Portion of Other-than-temporary Impairments on Debt Securities Held by the Company
   
(in millions)  
Balance as of April 30, 2010 $17
Credit losses recognized on securities previously not impaired  2
Additional credit losses recognized on securities previously impaired  3
Reductions for securities sold during the period  -2
Balance as of April 29, 2011  20
Credit losses recognized on securities previously not impaired  1
Additional credit losses recognized on securities previously impaired  1
Reductions for securities sold during the period  -2
Balance as of April 27, 2012 $20
Schedule of Available-for-sale Securities Contractual Maturities
(in millions) April 27, 2012
Due in one year or less $1,940
Due after one year through five years  5,374
Due after five years through ten years  796
Due after ten years  132
Total debt securities $8,242