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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 $)
In Millions
Sep. 24, 2011
Sep. 25, 2010
Sep. 26, 2009
Sep. 27, 2008
Schedule of Available-for-sale Securities [Line Items]    
Adjusted Cost$ 81,464$ 50,831  
Unrealized Gain264191  
Unrealized Losses(158)(11)  
Fair Value81,57051,011  
Cash and Cash Equivalents9,81511,2615,26311,875
Short-term marketable securities16,13714,359  
Long-term marketable securities55,61825,391  
Level 1
    
Schedule of Available-for-sale Securities [Line Items]    
Adjusted Cost3,138   
Unrealized Gain0   
Unrealized Losses(34)   
Fair Value3,104   
Cash and Cash Equivalents1,911   
Short-term marketable securities1,193   
Long-term marketable securities0   
Level 1 | Money Market Funds
    
Schedule of Available-for-sale Securities [Line Items]    
Adjusted Cost1,9112,753  
Unrealized Gain00  
Unrealized Losses00  
Fair Value1,9112,753  
Cash and Cash Equivalents1,9112,753  
Short-term marketable securities00  
Long-term marketable securities00  
Level 1 | Mutual Funds
    
Schedule of Available-for-sale Securities [Line Items]    
Adjusted Cost1,227   
Unrealized Gain0   
Unrealized Losses(34)   
Fair Value1,193   
Cash and Cash Equivalents0   
Short-term marketable securities1,193   
Long-term marketable securities0   
Level 2
    
Schedule of Available-for-sale Securities [Line Items]    
Adjusted Cost75,42346,388  
Unrealized Gain264191  
Unrealized Losses(124)(11)  
Fair Value75,56346,568  
Cash and Cash Equivalents5,0016,818  
Short-term marketable securities14,94414,359  
Long-term marketable securities55,61825,391  
Level 2 | U.S. Treasury Securities
    
Schedule of Available-for-sale Securities [Line Items]    
Adjusted Cost10,7179,872  
Unrealized Gain3942  
Unrealized Losses(3)0  
Fair Value10,7539,914  
Cash and Cash Equivalents1,2502,571  
Short-term marketable securities2,1492,130  
Long-term marketable securities7,3545,213  
Level 2 | U.S. agency securities
    
Schedule of Available-for-sale Securities [Line Items]    
Adjusted Cost13,4678,717  
Unrealized Gain2410  
Unrealized Losses(3)0  
Fair Value13,4888,727  
Cash and Cash Equivalents2251,916  
Short-term marketable securities1,8184,339  
Long-term marketable securities11,4452,472  
Level 2 | Non-U.S. government securities
    
Schedule of Available-for-sale Securities [Line Items]    
Adjusted Cost5,5592,648  
Unrealized Gain1113  
Unrealized Losses(2)0  
Fair Value5,5682,661  
Cash and Cash Equivalents55110  
Short-term marketable securities1,548865  
Long-term marketable securities3,4691,786  
Level 2 | Certificates of deposit and time deposits
    
Schedule of Available-for-sale Securities [Line Items]    
Adjusted Cost4,1752,735  
Unrealized Gain25  
Unrealized Losses(2)(1)  
Fair Value4,1752,739  
Cash and Cash Equivalents728374  
Short-term marketable securities977850  
Long-term marketable securities2,4701,515  
Level 2 | Commercial Paper
    
Schedule of Available-for-sale Securities [Line Items]    
Adjusted Cost2,8533,168  
Unrealized Gain00  
Unrealized Losses00  
Fair Value2,8533,168  
Cash and Cash Equivalents2,2371,889  
Short-term marketable securities6161,279  
Long-term marketable securities00  
Level 2 | Corporate Securities
    
Schedule of Available-for-sale Securities [Line Items]    
Adjusted Cost35,24117,349  
Unrealized Gain132102  
Unrealized Losses(114)(9)  
Fair Value35,25917,442  
Cash and Cash Equivalents1058  
Short-term marketable securities7,2414,522  
Long-term marketable securities28,00812,862  
Level 2 | Municipal securities
    
Schedule of Available-for-sale Securities [Line Items]    
Adjusted Cost3,4111,899  
Unrealized Gain5619  
Unrealized Losses0(1)  
Fair Value3,4671,917  
Cash and Cash Equivalents00  
Short-term marketable securities595374  
Long-term marketable securities2,8721,543  
Cash
    
Schedule of Available-for-sale Securities [Line Items]    
Adjusted Cost2,9031,690  
Unrealized Gain00  
Unrealized Losses00  
Fair Value2,9031,690  
Cash and Cash Equivalents2,9031,690  
Short-term marketable securities00  
Long-term marketable securities$ 0$ 0