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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, unless otherwise specified
Dec. 31, 2011
Sep. 24, 2011
Dec. 25, 2010
Sep. 25, 2010
Schedule of Available-for-sale Securities [Line Items]        
Adjusted Cost $ 97,521 $ 81,464    
Unrealized Gains 283 264    
Unrealized Losses (203) (158)    
Fair Value 97,601 81,570    
Cash and cash equivalents 10,310 9,815 10,734 11,261
Short-Term Marketable Securities 19,846 16,137    
Long-term marketable securities 67,445 55,618    
Cash
       
Schedule of Available-for-sale Securities [Line Items]        
Adjusted Cost 3,956 2,903    
Unrealized Gains 0 0    
Unrealized Losses 0 0    
Fair Value 3,956 2,903    
Cash and cash equivalents 3,956 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 4,733 3,138    
Unrealized Gains 0 0    
Unrealized Losses (35) (34)    
Fair Value 4,698 3,104    
Cash and cash equivalents 3,495 1,911    
Short-Term Marketable Securities 1,203 1,193    
Long-term marketable securities 0 0    
Level 1 | Money Market Funds
       
Schedule of Available-for-sale Securities [Line Items]        
Adjusted Cost 3,495 1,911    
Unrealized Gains 0 0    
Unrealized Losses 0 0    
Fair Value 3,495 1,911    
Cash and cash equivalents 3,495 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 1,238 1,227    
Unrealized Gains 0 0    
Unrealized Losses (35) (34)    
Fair Value 1,203 1,193    
Cash and cash equivalents 0 0    
Short-Term Marketable Securities 1,203 1,193    
Long-term marketable securities 0 0    
Level 2
       
Schedule of Available-for-sale Securities [Line Items]        
Adjusted Cost 88,832 75,423    
Unrealized Gains 283 264    
Unrealized Losses (168) (124)    
Fair Value 88,947 75,563    
Cash and cash equivalents 2,859 5,001    
Short-Term Marketable Securities 18,643 14,944    
Long-term marketable securities 67,445 55,618    
Level 2 | U.S. Treasury Securities
       
Schedule of Available-for-sale Securities [Line Items]        
Adjusted Cost 14,685 10,717    
Unrealized Gains 27 39    
Unrealized Losses (3) (3)    
Fair Value 14,709 10,753    
Cash and cash equivalents 0 1,250    
Short-Term Marketable Securities 2,789 2,149    
Long-term marketable securities 11,920 7,354    
Level 2 | U.S. agency securities
       
Schedule of Available-for-sale Securities [Line Items]        
Adjusted Cost 20,000 13,467    
Unrealized Gains 18 24    
Unrealized Losses (11) (3)    
Fair Value 20,007 13,488    
Cash and cash equivalents 363 225    
Short-Term Marketable Securities 4,279 1,818    
Long-term marketable securities 15,365 11,445    
Level 2 | Non-U.S. government securities
       
Schedule of Available-for-sale Securities [Line Items]        
Adjusted Cost 5,251 5,559    
Unrealized Gains 35 11    
Unrealized Losses (5) (2)    
Fair Value 5,281 5,568    
Cash and cash equivalents 127 551    
Short-Term Marketable Securities 1,642 1,548    
Long-term marketable securities 3,512 3,469    
Level 2 | Certificates of deposit and time deposits
       
Schedule of Available-for-sale Securities [Line Items]        
Adjusted Cost 3,837 4,175    
Unrealized Gains 1 2    
Unrealized Losses 0 (2)    
Fair Value 3,838 4,175    
Cash and cash equivalents 1,462 728    
Short-Term Marketable Securities 629 977    
Long-term marketable securities 1,747 2,470    
Level 2 | Commercial Paper
       
Schedule of Available-for-sale Securities [Line Items]        
Adjusted Cost 1,518 2,853    
Unrealized Gains 0 0    
Unrealized Losses 0 0    
Fair Value 1,518 2,853    
Cash and cash equivalents 863 2,237    
Short-Term Marketable Securities 655 616    
Long-term marketable securities 0 0    
Level 2 | Corporate Securities
       
Schedule of Available-for-sale Securities [Line Items]        
Adjusted Cost 38,914 35,241    
Unrealized Gains 149 132    
Unrealized Losses (147) (114)    
Fair Value 38,916 35,259    
Cash and cash equivalents 44 10    
Short-Term Marketable Securities 8,127 7,241    
Long-term marketable securities 30,745 28,008    
Level 2 | Municipal securities
       
Schedule of Available-for-sale Securities [Line Items]        
Adjusted Cost 4,078 3,411    
Unrealized Gains 53 56    
Unrealized Losses (1) 0    
Fair Value 4,130 3,467    
Cash and cash equivalents 0 0    
Short-Term Marketable Securities 522 595    
Long-term marketable securities 3,608 2,872    
Level 2 | Asset-backed securities
       
Schedule of Available-for-sale Securities [Line Items]        
Adjusted Cost 549      
Unrealized Gains 0      
Unrealized Losses (1)      
Fair Value 548      
Cash and cash equivalents 0      
Short-Term Marketable Securities 0      
Long-term marketable securities $ 548