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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 and Long-Term Marketable Securities (Detail) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2012
Sep. 24, 2011
Jun. 25, 2011
Sep. 25, 2010
Schedule of Available-for-sale Securities [Line Items]        
Adjusted Cost $ 116,712 $ 81,464    
Unrealized Gains 581 264    
Unrealized Losses (72) (158)    
Fair Value 117,221 81,570    
Cash and cash equivalents 7,945 9,815 12,091 11,261
Short-Term Marketable Securities 19,709 16,137    
Long-term marketable securities 89,567 55,618    
Cash
       
Schedule of Available-for-sale Securities [Line Items]        
Adjusted Cost 3,269 2,903    
Unrealized Gains 0 0    
Unrealized Losses 0 0    
Fair Value 3,269 2,903    
Cash and cash equivalents 3,269 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 3,075 3,138    
Unrealized Gains 34 0    
Unrealized Losses (17) (34)    
Fair Value 3,092 3,104    
Cash and cash equivalents 1,181 1,911    
Short-Term Marketable Securities 1,911 1,193    
Long-term marketable securities 0 0    
Level 1 | Money market funds
       
Schedule of Available-for-sale Securities [Line Items]        
Adjusted Cost 1,181 1,911    
Unrealized Gains 0 0    
Unrealized Losses 0 0    
Fair Value 1,181 1,911    
Cash and cash equivalents 1,181 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 1,894 1,227    
Unrealized Gains 34 0    
Unrealized Losses (17) (34)    
Fair Value 1,911 1,193    
Cash and cash equivalents 0 0    
Short-Term Marketable Securities 1,911 1,193    
Long-term marketable securities 0 0    
Level 2
       
Schedule of Available-for-sale Securities [Line Items]        
Adjusted Cost 110,368 75,423    
Unrealized Gains 547 264    
Unrealized Losses (55) (124)    
Fair Value 110,860 75,563    
Cash and cash equivalents 3,495 5,001    
Short-Term Marketable Securities 17,798 14,944    
Long-term marketable securities 89,567 55,618    
Level 2 | U.S. Treasury securities
       
Schedule of Available-for-sale Securities [Line Items]        
Adjusted Cost 20,587 10,717    
Unrealized Gains 10 39    
Unrealized Losses (6) (3)    
Fair Value 20,591 10,753    
Cash and cash equivalents 1,100 1,250    
Short-Term Marketable Securities 4,169 2,149    
Long-term marketable securities 15,322 7,354    
Level 2 | U.S. agency securities
       
Schedule of Available-for-sale Securities [Line Items]        
Adjusted Cost 19,197 13,467    
Unrealized Gains 41 24    
Unrealized Losses (3) (3)    
Fair Value 19,235 13,488    
Cash and cash equivalents 479 225    
Short-Term Marketable Securities 2,026 1,818    
Long-term marketable securities 16,730 11,445    
Level 2 | Non-U.S. government securities
       
Schedule of Available-for-sale Securities [Line Items]        
Adjusted Cost 6,919 5,559    
Unrealized Gains 103 11    
Unrealized Losses (7) (2)    
Fair Value 7,015 5,568    
Cash and cash equivalents 1 551    
Short-Term Marketable Securities 1,842 1,548    
Long-term marketable securities 5,172 3,469    
Level 2 | Certificates of deposit and time deposits
       
Schedule of Available-for-sale Securities [Line Items]        
Adjusted Cost 2,411 4,175    
Unrealized Gains 2 2    
Unrealized Losses 0 (2)    
Fair Value 2,413 4,175    
Cash and cash equivalents 857 728    
Short-Term Marketable Securities 377 977    
Long-term marketable securities 1,179 2,470    
Level 2 | Commercial paper
       
Schedule of Available-for-sale Securities [Line Items]        
Adjusted Cost 2,301 2,853    
Unrealized Gains 0 0    
Unrealized Losses 0 0    
Fair Value 2,301 2,853    
Cash and cash equivalents 991 2,237    
Short-Term Marketable Securities 1,310 616    
Long-term marketable securities 0 0    
Level 2 | Corporate securities
       
Schedule of Available-for-sale Securities [Line Items]        
Adjusted Cost 44,545 35,241    
Unrealized Gains 306 132    
Unrealized Losses (31) (114)    
Fair Value 44,820 35,259    
Cash and cash equivalents 24 10    
Short-Term Marketable Securities 7,482 7,241    
Long-term marketable securities 37,314 28,008    
Level 2 | Municipal securities
       
Schedule of Available-for-sale Securities [Line Items]        
Adjusted Cost 5,541 3,411    
Unrealized Gains 61 56    
Unrealized Losses (3) 0    
Fair Value 5,599 3,467    
Cash and cash equivalents 43 0    
Short-Term Marketable Securities 588 595    
Long-term marketable securities 4,968 2,872    
Level 2 | Mortgage and asset-backed securities
       
Schedule of Available-for-sale Securities [Line Items]        
Adjusted Cost 8,867      
Unrealized Gains 24      
Unrealized Losses (5)      
Fair Value 8,886      
Cash and cash equivalents 0      
Short-Term Marketable Securities 4      
Long-term marketable securities $ 8,882