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Cash and 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, unless otherwise specified
Sep. 29, 2012
Sep. 24, 2011
Sep. 25, 2010
Sep. 26, 2009
Schedule of Available-for-sale Securities [Line Items]        
Adjusted Cost $ 120,220 $ 81,464    
Unrealized Gain 1,051 264    
Unrealized Losses (20) (158)    
Fair Value 121,251 81,570    
Cash and cash equivalents 10,746 9,815 11,261 5,263
Short-term marketable securities 18,383 16,137    
Long-term marketable securities 92,122 55,618    
Cash
       
Schedule of Available-for-sale Securities [Line Items]        
Adjusted Cost 3,109 2,903    
Unrealized Gain 0 0    
Unrealized Losses 0 0    
Fair Value 3,109 2,903    
Cash and cash equivalents 3,109 2,903    
Short-term marketable securities 0 0    
Long-term marketable securities 0 0    
Level 1
       
Schedule of Available-for-sale Securities [Line Items]        
Adjusted Cost 3,845 3,138    
Unrealized Gain 79 0    
Unrealized Losses (2) (34)    
Fair Value 3,922 3,104    
Cash and cash equivalents 1,460 1,911    
Short-term marketable securities 2,462 1,193    
Long-term marketable securities 0 0    
Level 1 | Money market funds
       
Schedule of Available-for-sale Securities [Line Items]        
Adjusted Cost 1,460 1,911    
Unrealized Gain 0 0    
Unrealized Losses 0 0    
Fair Value 1,460 1,911    
Cash and cash equivalents 1,460 1,911    
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 2,385 1,227    
Unrealized Gain 79 0    
Unrealized Losses (2) (34)    
Fair Value 2,462 1,193    
Cash and cash equivalents 0 0    
Short-term marketable securities 2,462 1,193    
Long-term marketable securities 0 0    
Level 2
       
Schedule of Available-for-sale Securities [Line Items]        
Adjusted Cost 113,266 75,423    
Unrealized Gain 972 264    
Unrealized Losses (18) (124)    
Fair Value 114,220 75,563    
Cash and cash equivalents 6,177 5,001    
Short-term marketable securities 15,921 14,944    
Long-term marketable securities 92,122 55,618    
Level 2 | U.S. Treasury Securities
       
Schedule of Available-for-sale Securities [Line Items]        
Adjusted Cost 20,088 10,717    
Unrealized Gain 21 39    
Unrealized Losses (1) (3)    
Fair Value 20,108 10,753    
Cash and cash equivalents 2,608 1,250    
Short-term marketable securities 3,525 2,149    
Long-term marketable securities 13,975 7,354    
Level 2 | U.S. agency securities
       
Schedule of Available-for-sale Securities [Line Items]        
Adjusted Cost 19,540 13,467    
Unrealized Gain 58 24    
Unrealized Losses (1) (3)    
Fair Value 19,597 13,488    
Cash and cash equivalents 1,460 225    
Short-term marketable securities 1,884 1,818    
Long-term marketable securities 16,253 11,445    
Level 2 | Non-U.S. government securities
       
Schedule of Available-for-sale Securities [Line Items]        
Adjusted Cost 5,483 5,559    
Unrealized Gain 183 11    
Unrealized Losses (2) (2)    
Fair Value 5,664 5,568    
Cash and cash equivalents 84 551    
Short-term marketable securities 1,034 1,548    
Long-term marketable securities 4,546 3,469    
Level 2 | Certificates of deposit and time deposits
       
Schedule of Available-for-sale Securities [Line Items]        
Adjusted Cost 2,189 4,175    
Unrealized Gain 2 2    
Unrealized Losses 0 (2)    
Fair Value 2,191 4,175    
Cash and cash equivalents 1,106 728    
Short-term marketable securities 202 977    
Long-term marketable securities 883 2,470    
Level 2 | Commercial Paper
       
Schedule of Available-for-sale Securities [Line Items]        
Adjusted Cost 2,112 2,853    
Unrealized Gain 0 0    
Unrealized Losses 0 0    
Fair Value 2,112 2,853    
Cash and cash equivalents 909 2,237    
Short-term marketable securities 1,203 616    
Long-term marketable securities 0 0    
Level 2 | Corporate Securities
       
Schedule of Available-for-sale Securities [Line Items]        
Adjusted Cost 46,261 35,241    
Unrealized Gain 568 132    
Unrealized Losses (8) (114)    
Fair Value 46,821 35,259    
Cash and cash equivalents 10 10    
Short-term marketable securities 7,455 7,241    
Long-term marketable securities 39,356 28,008    
Level 2 | Municipal securities
       
Schedule of Available-for-sale Securities [Line Items]        
Adjusted Cost 5,645 3,411    
Unrealized Gain 74 56    
Unrealized Losses 0 0    
Fair Value 5,719 3,467    
Cash and cash equivalents 0 0    
Short-term marketable securities 618 595    
Long-term marketable securities 5,101 2,872    
Level 2 | Mortgage and asset-backed securities
       
Schedule of Available-for-sale Securities [Line Items]        
Adjusted Cost 11,948      
Unrealized Gain 66      
Unrealized Losses (6)      
Fair Value 12,008      
Cash and cash equivalents 0      
Short-term marketable securities 0      
Long-term marketable securities $ 12,008