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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
Mar. 31, 2012
Sep. 24, 2011
Mar. 26, 2011
Sep. 25, 2010
Schedule of Available-for-sale Securities [Line Items]        
Adjusted Cost $ 109,752 $ 81,464    
Unrealized Gains 500 264    
Unrealized Losses (76) (158)    
Fair Value 110,176 81,570    
Cash and cash equivalents 10,121 9,815 15,978 11,261
Short-Term Marketable Securities 18,417 16,137    
Long-term marketable securities 81,638 55,618    
Cash
       
Schedule of Available-for-sale Securities [Line Items]        
Adjusted Cost 2,911 2,903    
Unrealized Gains 0 0    
Unrealized Losses 0 0    
Fair Value 2,911 2,903    
Cash and cash equivalents 2,911 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 2,768 3,138    
Unrealized Gains 8 0    
Unrealized Losses (5) (34)    
Fair Value 2,771 3,104    
Cash and cash equivalents 1,513 1,911    
Short-Term Marketable Securities 1,258 1,193    
Long-term marketable securities 0 0    
Level 1 | Money Market Funds
       
Schedule of Available-for-sale Securities [Line Items]        
Adjusted Cost 1,513 1,911    
Unrealized Gains 0 0    
Unrealized Losses 0 0    
Fair Value 1,513 1,911    
Cash and cash equivalents 1,513 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 1,255 1,227    
Unrealized Gains 8 0    
Unrealized Losses (5) (34)    
Fair Value 1,258 1,193    
Cash and cash equivalents 0 0    
Short-Term Marketable Securities 1,258 1,193    
Long-term marketable securities 0 0    
Level 2
       
Schedule of Available-for-sale Securities [Line Items]        
Adjusted Cost 104,073 75,423    
Unrealized Gains 492 264    
Unrealized Losses (71) (124)    
Fair Value 104,494 75,563    
Cash and cash equivalents 5,697 5,001    
Short-Term Marketable Securities 17,159 14,944    
Long-term marketable securities 81,638 55,618    
Level 2 | U.S. Treasury Securities
       
Schedule of Available-for-sale Securities [Line Items]        
Adjusted Cost 18,469 10,717    
Unrealized Gains 10 39    
Unrealized Losses (17) (3)    
Fair Value 18,462 10,753    
Cash and cash equivalents 1,278 1,250    
Short-Term Marketable Securities 3,831 2,149    
Long-term marketable securities 13,353 7,354    
Level 2 | U.S. agency securities
       
Schedule of Available-for-sale Securities [Line Items]        
Adjusted Cost 21,130 13,467    
Unrealized Gains 35 24    
Unrealized Losses (8) (3)    
Fair Value 21,157 13,488    
Cash and cash equivalents 1,827 225    
Short-Term Marketable Securities 2,781 1,818    
Long-term marketable securities 16,549 11,445    
Level 2 | Non-U.S. government securities
       
Schedule of Available-for-sale Securities [Line Items]        
Adjusted Cost 5,326 5,559    
Unrealized Gains 78 11    
Unrealized Losses (4) (2)    
Fair Value 5,400 5,568    
Cash and cash equivalents 0 551    
Short-Term Marketable Securities 1,661 1,548    
Long-term marketable securities 3,739 3,469    
Level 2 | Certificates of deposit and time deposits
       
Schedule of Available-for-sale Securities [Line Items]        
Adjusted Cost 2,885 4,175    
Unrealized Gains 2 2    
Unrealized Losses 0 (2)    
Fair Value 2,887 4,175    
Cash and cash equivalents 986 728    
Short-Term Marketable Securities 339 977    
Long-term marketable securities 1,562 2,470    
Level 2 | Commercial Paper
       
Schedule of Available-for-sale Securities [Line Items]        
Adjusted Cost 2,545 2,853    
Unrealized Gains 0 0    
Unrealized Losses 0 0    
Fair Value 2,545 2,853    
Cash and cash equivalents 1,497 2,237    
Short-Term Marketable Securities 1,048 616    
Long-term marketable securities 0 0    
Level 2 | Corporate Securities
       
Schedule of Available-for-sale Securities [Line Items]        
Adjusted Cost 43,391 35,241    
Unrealized Gains 307 132    
Unrealized Losses (32) (114)    
Fair Value 43,666 35,259    
Cash and cash equivalents 85 10    
Short-Term Marketable Securities 6,856 7,241    
Long-term marketable securities 36,725 28,008    
Level 2 | Municipal securities
       
Schedule of Available-for-sale Securities [Line Items]        
Adjusted Cost 4,792 3,411    
Unrealized Gains 53 56    
Unrealized Losses (5) 0    
Fair Value 4,840 3,467    
Cash and cash equivalents 24 0    
Short-Term Marketable Securities 640 595    
Long-term marketable securities 4,176 2,872    
Level 2 | Mortgage and asset-backed securities
       
Schedule of Available-for-sale Securities [Line Items]        
Adjusted Cost 5,535      
Unrealized Gains 7      
Unrealized Losses (5)      
Fair Value 5,537      
Cash and cash equivalents 0      
Short-Term Marketable Securities 3      
Long-term marketable securities $ 5,534