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Available-for-Sale securities' Adjusted Cost, Gross Unrealized Gains, Gross Unrealized Losses and Fair Value Recorded as Cash and Cash Equivalents or Short-Term or Long-Term Marketable Securities (Detail) (USD $)
In Millions
Jun. 25, 2011
Sep. 25, 2010
Jun. 26, 2010
Sep. 26, 2009
Schedule of Available-for-sale Securities [Line Items]        
Adjusted Cost $ 75,876 $ 50,831    
Unrealized Gains 292 191    
Unrealized Losses (12) (11)    
Fair Value 76,156 51,011    
Cash and Cash Equivalents 12,091 11,261 9,705 5,263
Short-term marketable securities 16,304 14,359    
Long-term marketable securities 47,761 25,391    
Level 1
       
Schedule of Available-for-sale Securities [Line Items]        
Adjusted Cost 1,564      
Unrealized Gains 0      
Unrealized Losses 0      
Fair Value 1,564      
Cash and Cash Equivalents 1,414      
Short-term marketable securities 150      
Long-term marketable securities 0      
Level 1 | Money Market Funds
       
Schedule of Available-for-sale Securities [Line Items]        
Adjusted Cost 1,414 2,753    
Unrealized Gains 0 0    
Unrealized Losses 0 0    
Fair Value 1,414 2,753    
Cash and Cash Equivalents 1,414 2,753    
Short-term marketable securities 0 0    
Long-term marketable securities 0 0    
Level 1 | Mutual Funds
       
Schedule of Available-for-sale Securities [Line Items]        
Adjusted Cost 150      
Unrealized Gains 0      
Unrealized Losses 0      
Fair Value 150      
Cash and Cash Equivalents 0      
Short-term marketable securities 150      
Long-term marketable securities 0      
Level 2
       
Schedule of Available-for-sale Securities [Line Items]        
Adjusted Cost 71,543 46,388    
Unrealized Gains 292 191    
Unrealized Losses (12) (11)    
Fair Value 71,823 46,568    
Cash and Cash Equivalents 7,908 6,818    
Short-term marketable securities 16,154 14,359    
Long-term marketable securities 47,761 25,391    
Level 2 | U.S. Treasury Securities
       
Schedule of Available-for-sale Securities [Line Items]        
Adjusted Cost 10,736 9,872    
Unrealized Gains 51 42    
Unrealized Losses 0 0    
Fair Value 10,787 9,914    
Cash and Cash Equivalents 1,139 2,571    
Short-term marketable securities 1,876 2,130    
Long-term marketable securities 7,772 5,213    
Level 2 | U.S. agency securities
       
Schedule of Available-for-sale Securities [Line Items]        
Adjusted Cost 9,986 8,717    
Unrealized Gains 17 10    
Unrealized Losses (1) 0    
Fair Value 10,002 8,727    
Cash and Cash Equivalents 391 1,916    
Short-term marketable securities 1,980 4,339    
Long-term marketable securities 7,631 2,472    
Level 2 | Non-U.S. government securities
       
Schedule of Available-for-sale Securities [Line Items]        
Adjusted Cost 6,127 2,648    
Unrealized Gains 18 13    
Unrealized Losses (1) 0    
Fair Value 6,144 2,661    
Cash and Cash Equivalents 427 10    
Short-term marketable securities 1,952 865    
Long-term marketable securities 3,765 1,786    
Level 2 | Certificates of deposit and time deposits
       
Schedule of Available-for-sale Securities [Line Items]        
Adjusted Cost 4,538 2,735    
Unrealized Gains 4 5    
Unrealized Losses 0 (1)    
Fair Value 4,542 2,739    
Cash and Cash Equivalents 893 374    
Short-term marketable securities 1,231 850    
Long-term marketable securities 2,418 1,515    
Level 2 | Commercial Paper
       
Schedule of Available-for-sale Securities [Line Items]        
Adjusted Cost 6,326 3,168    
Unrealized Gains 0 0    
Unrealized Losses 0 0    
Fair Value 6,326 3,168    
Cash and Cash Equivalents 4,977 1,889    
Short-term marketable securities 1,349 1,279    
Long-term marketable securities 0 0    
Level 2 | Corporate Securities
       
Schedule of Available-for-sale Securities [Line Items]        
Adjusted Cost 30,441 17,349    
Unrealized Gains 167 102    
Unrealized Losses (9) (9)    
Fair Value 30,599 17,442    
Cash and Cash Equivalents 81 58    
Short-term marketable securities 7,242 4,522    
Long-term marketable securities 23,276 12,862    
Level 2 | Municipal securities
       
Schedule of Available-for-sale Securities [Line Items]        
Adjusted Cost 3,389 1,899    
Unrealized Gains 35 19    
Unrealized Losses (1) (1)    
Fair Value 3,423 1,917    
Cash and Cash Equivalents 0 0    
Short-term marketable securities 524 374    
Long-term marketable securities 2,899 1,543    
Cash
       
Schedule of Available-for-sale Securities [Line Items]        
Adjusted Cost 2,769 1,690    
Unrealized Gains 0 0    
Unrealized Losses 0 0    
Fair Value 2,769 1,690    
Cash and Cash Equivalents 2,769 1,690    
Short-term marketable securities 0 0    
Long-term marketable securities $ 0 $ 0