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Fair Value Measurements (Tables)
12 Months Ended
Apr. 27, 2012
Fair Value Disclosures [Abstract]  
Information by Level for Assets and Liabilities that are Measured at Fair Value on a Recurring Basis
  Fair Value Fair Value Measurements
  as of Using Inputs Considered as
(in millions) April 27, 2012 Level 1 Level 2 Level 3
Assets:            
Corporate debt securities $ 3,541 $ - $ 3,531 $ 10
Auction rate securities   127   -   -   127
Mortgage-backed securities   839   -   810   29
U.S. government and agency securities   3,084   1,511   1,573   -
Foreign government and agency securities   67   -   67   -
Certificates of deposit   47   -   47   -
Other asset-backed securities   537   -   531   6
Marketable equity securities   253   253   -   -
Exchange-traded funds   46   46   -   -
Derivative assets   254   87   167   -
Total assets $ 8,795 $ 1,897 $ 6,726 $ 172
             
Liabilities:            
Derivative liabilities $ 82 $ 37 $ 45 $ -
Total liabilities $ 82 $ 37 $ 45 $ -

    Fair Value Measurements
  Fair Value at Using Inputs Considered as
(in millions) April 29, 2011 Level 1 Level 2 Level 3
Assets:             
Corporate debt securities $ 1,961 $ - $ 1,944  $ 17
Auction rate securities   133   -   -    133
Mortgage-backed securities   785   -   750    35
U.S. government and agency securities   2,756   1,453   1,303    -
Foreign government and agency securities   131   -   131    -
Certificates of deposit   119   -   119    -
Other asset-backed securities   349   -   343    6
Marketable equity securities   237   237   -    -
Exchange-traded funds   39   39   -    -
Derivative assets   130   21   109    -
Total assets $ 6,640 $ 1,750 $ 4,699  $ 191
              
Liabilities:             
Derivative liabilities $ 303 $ 303 $ -  $ -
Total liabilities $ 303 $ 303 $ -  $ -
Fair Value Inputs, Assets, Quantitative Information
($ in millions) Valuation Technique Unobservable Input Range (Weighted Average)
Auction rate securities Discounted cash flow Years to principal recovery Illiquidity premium 2 yrs - 12 yrs (3 yrs) 6%
Reconciliation of Beginning and Ending Balances of Items Measured at Fair Value on a Recurring Basis that Used Significant Unobservable Inputs (Level 3)
               
(in millions)Total Level 3 Investments Corporate debt securities Auction rate securities Mortgage-backed securities Other asset-backed securities
Balance as of April 29, 2011$ 191 $ 17 $ 133 $ 35 $ 6
Total realized losses and other-than-temporary impairment losses included in earnings  (3)   (1)   -   (1)   (1)
Total unrealized gains/(losses) included in other comprehensive income  9   1   8   (1)   1
Settlements  (25)   (7)   (14)   (4)   -
Balance as of April 27, 2012$ 172 $ 10 $ 127 $ 29 $ 6
               
               
(in millions)Total Level 3 Investments Corporate debt securities Auction rate securities Mortgage-backed securities Other asset-backed securities
Balance as of April 30, 2010$ 213 $ 16 $ 142 $ 39 $ 16
Total realized losses and other-than-temporary impairment losses included in earnings  (6)   (2)   -   (4)   -
Total unrealized gains/(losses) included in other comprehensive income  27   4   20   3   -
Settlements  (43)   (1)   (29)   (3)   (10)
Balance as of April 29, 2011$ 191 $ 17 $ 133 $ 35 $ 6