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Investments, Investments Portfolio and AFS Continuous Unrealized Loss Position (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Jul. 26, 2013
Apr. 26, 2013
Jul. 26, 2013
Corporate Debt Securities
Apr. 26, 2013
Corporate Debt Securities
Jul. 26, 2013
Auction Rate Securities
Apr. 26, 2013
Auction Rate Securities
Jul. 26, 2013
Mortgage Backed Securities
Apr. 26, 2013
Mortgage Backed Securities
Jul. 26, 2013
US Government and Agency Securities
Apr. 26, 2013
US Government and Agency Securities
Jul. 26, 2013
Foreign Government and Agency Securities
Apr. 26, 2013
Foreign Government and Agency Securities
Jul. 26, 2013
Certificates of Deposit
Apr. 26, 2013
Certificates of Deposit
Jul. 26, 2013
Other Asset-backed Securities
Apr. 26, 2013
Other Asset-backed Securities
Jul. 26, 2013
Debt Funds [Member]
Jul. 26, 2013
Categories of Investments, Marketable Securities, Available-for-sale Securities [Member]
Apr. 26, 2013
Categories of Investments, Marketable Securities, Available-for-sale Securities [Member]
Jul. 26, 2013
Exchange Traded Funds
Apr. 26, 2013
Exchange Traded Funds
Jul. 26, 2013
Debt Securities
Jul. 27, 2012
Debt Securities
Jul. 26, 2013
Equity Securities
Jul. 27, 2012
Equity Securities
Jul. 26, 2013
Nonrecurring
Apr. 26, 2013
Nonrecurring
Available-for-sale securities:                                                      
Available-for-sale securities, cost     $ 4,801 $ 4,587 $ 118 $ 118 $ 1,067 $ 1,050 $ 3,631 $ 3,882 $ 29 $ 38 $ 6 $ 6 $ 628 $ 539 $ 436 $ 69 $ 82                
Available-for-sale securities, unrealized gains     37 78 0 0 4 8 7 17 0 0 0 0 1 2 3 58 75                
Available-for-sale securities, unrealized losses     (33) (4) (11) (15) (12) (5) (39) (1) 0 0 0 0 (2) 0 (9) 0 (2)                
Available-for-sale securities, fair value     4,805 4,661 107 103 1,059 1,053 3,599 3,898 29 38 6 6 627 541 430 127 155                
Trading securities:                                                      
Trading securities, cost                                       47 45            
Trading securities, unrealized gains                                       8 5            
Trading securities, unrealized losses                                       0 0            
Trading securities, fair value                                       55 50            
Aggregate carrying amount of investments in equity and other securities that are accounted for using the cost or equity method 616 549                                               616 549
Short-term and long-term investments, cost 11,448 10,896                                                  
Short-term and long-term investments, unrealized gains 118 185                                                  
Short-term and long-term investments, unrealized losses (106) (27)                                                  
Short-term and long-term investments, fair value 10,844 10,505                                                  
AFS Continuous Unrealized Loss Position                                                      
Less than 12 months, fair value 5,026 1,044 2,243 544 0 0 697 195 1,630 291         301   155   14                
Less than 12 months, unrealized losses (90) (5) (31) (1) 0 0 (9) (1) (39) (1)         (2)   (9)   (2)                
More than 12 months, fair value 164 160 13 13 107 103 44 44 0 0         0   0   0                
More than 12 months, unrealized losses (16) (22) (2) (3) (11) (15) (3) (4) 0 0         0   0   0                
AFS Gross Realized Gain (Loss)                                                      
Proceeds from sales                                           2,163 [1] 1,871 [1] 32 [2] 24 [2]    
Gross realized gains                                           6 [1] 17 [1] 18 [2] 8 [2]    
Gross realized losses                                           5 [1] 3 [1] 0 [2] 0 [2]    
Impairment losses recognized                                           $ 0 [1] $ 0 [1] $ 0 [2] $ 6 [2]    
[1] Includes available-for-sale debt securities.
[2] Includes marketable equity securities, cost method, equity method, exchange-traded funds, and other investments.