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Investments (Investments Portfolio and AFS Continuous Unrealized Loss Position) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Oct. 28, 2011
Oct. 29, 2010
Oct. 28, 2011
Oct. 29, 2010
Apr. 29, 2011
Investment Holdings [Line Items]          
Cost method, equity method, and other investments, cost $ 831   $ 831   $ 656
Cost method, equity method, and other investments, fair value 831   831   656
Short-term and long-term investments, cost 8,033   8,033   6,990
Short-term and long-term investments, unrealized gains 194   194   228
Short-term and long-term investments, unrealized losses (96)   (96)   (52)
Short-term and long-term investments, fair value 8,131   8,131   7,166
AFS Continuous Unrealized Loss Position          
Less than 12 months, fair value 1,833   1,833   758
Less than 12 months, unrealized losses (41)   (41)   (4)
More than 12 months, fair value 215   215   228
More than 12 months, unrealized losses (53)   (53)   (48)
AFS OTTI Losses          
OTTI losses recognized in OCI 1 6 2 12  
OTTI losses recognized in earnings 1 2 1 5  
Total OTTI losses recognized 1 8 3 17  
Corporate Debt Securities [Member]
         
Investment Holdings [Line Items]          
Available-for-sale securities, cost 2,512   2,512   1,947
Available-for-sale securities, unrealized gains 24   24   20
Available-for-sale securities, unrealized losses (13)   (13)   (6)
Available-for-sale securities, fair value 2,523   2,523   1,961
AFS Continuous Unrealized Loss Position          
Less than 12 months, fair value 793   793   256
Less than 12 months, unrealized losses (10)   (10)   (1)
More than 12 months, fair value 10   10   16
More than 12 months, unrealized losses (3)   (3)   (5)
Auction Rate Securities [Member]
         
Investment Holdings [Line Items]          
Available-for-sale securities, cost 167   167   167
Available-for-sale securities, unrealized gains 0   0   0
Available-for-sale securities, unrealized losses (40)   (40)   (34)
Available-for-sale securities, fair value 127   127   133
AFS Continuous Unrealized Loss Position          
Less than 12 months, fair value 0   0   0
Less than 12 months, unrealized losses 0   0   0
More than 12 months, fair value 127   127   133
More than 12 months, unrealized losses (40)   (40)   (34)
Mortgage Backed Securities [Member]
         
Investment Holdings [Line Items]          
Available-for-sale securities, cost 933   933   783
Available-for-sale securities, unrealized gains 10   10   10
Available-for-sale securities, unrealized losses (12)   (12)   (8)
Available-for-sale securities, fair value 931   931   785
AFS Continuous Unrealized Loss Position          
Less than 12 months, fair value 308   308   161
Less than 12 months, unrealized losses (3)   (3)   (1)
More than 12 months, fair value 62   62   67
More than 12 months, unrealized losses (9)   (9)   (7)
US Government Agencies Debt Securities [Member]
         
Investment Holdings [Line Items]          
Available-for-sale securities, cost 2,842   2,842   2,731
Available-for-sale securities, unrealized gains 45   45   26
Available-for-sale securities, unrealized losses (2)   (2)   (1)
Available-for-sale securities, fair value 2,885   2,885   2,756
AFS Continuous Unrealized Loss Position          
Less than 12 months, fair value 679   679   267
Less than 12 months, unrealized losses (2)   (2)   (1)
More than 12 months, fair value 0   0   0
More than 12 months, unrealized losses 0   0   0
Foreign Government Debt Securities [Member]
         
Investment Holdings [Line Items]          
Available-for-sale securities, cost 90   90   130
Available-for-sale securities, unrealized gains 1   1   1
Available-for-sale securities, unrealized losses 0   0   0
Available-for-sale securities, fair value 91   91   131
Certificates of Deposit [Member]
         
Investment Holdings [Line Items]          
Available-for-sale securities, cost 97   97   119
Available-for-sale securities, unrealized gains 0   0   0
Available-for-sale securities, unrealized losses 0   0   0
Available-for-sale securities, fair value 97   97   119
Other Asset-backed Securities [Member]
         
Investment Holdings [Line Items]          
Available-for-sale securities, cost 437   437   351
Available-for-sale securities, unrealized gains 2   2   1
Available-for-sale securities, unrealized losses (1)   (1)   (3)
Available-for-sale securities, fair value 438   438   349
AFS Continuous Unrealized Loss Position          
Less than 12 months, fair value 0   0   74
Less than 12 months, unrealized losses 0   0   (1)
More than 12 months, fair value 16   16   12
More than 12 months, unrealized losses (1)   (1)   (2)
Marketable Equity Securities [Member]
         
Investment Holdings [Line Items]          
Available-for-sale securities, cost 79   79   73
Available-for-sale securities, unrealized gains 111   111   164
Available-for-sale securities, unrealized losses (26)   (26)   0
Available-for-sale securities, fair value 164   164   237
AFS Continuous Unrealized Loss Position          
Less than 12 months, fair value 53   53    
Less than 12 months, unrealized losses (26)   (26)    
More than 12 months, fair value 0   0    
More than 12 months, unrealized losses 0   0    
Exchange Traded Funds [Member]
         
Investment Holdings [Line Items]          
Trading securities, cost 45   45   33
Trading securities, unrealized gains 1   1   6
Trading securities, unrealized losses (2)   (2)    
Trading securities, fair value 44   44   39
Debt Securities [Member]
         
AFS Gross Realized Gain (Loss)          
Proceeds from sales 1,406 1,609 2,967 2,793  
Gross realized gains 14 10 24 17  
Gross realized losses (5) (3) (7) (7)  
Impairment losses recognized 0 (2) (1) (5)  
Equity Securities [Member]
         
AFS Gross Realized Gain (Loss)          
Proceeds from sales 12 0 53 0  
Gross realized gains 50 0 55 0  
Gross realized losses 0 0 0 0  
Impairment losses recognized $ (4) $ (2) $ (4) $ (5)