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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
Jun. 27, 2015
Sep. 27, 2014
Jun. 28, 2014
Sep. 28, 2013
Schedule of Available-for-sale Securities [Line Items]        
Adjusted Cost $ 203,355 $ 155,332    
Unrealized Gains 395 418    
Unrealized Losses (902) (511)    
Fair Value 202,848 155,239    
Cash and cash equivalents 15,319 13,844 $ 12,977 $ 14,259
Short-term marketable securities 19,384 11,233    
Long-term marketable securities 168,145 130,162    
Cash        
Schedule of Available-for-sale Securities [Line Items]        
Adjusted Cost 10,451 10,232    
Unrealized Gains 0 0    
Unrealized Losses 0 0    
Fair Value 10,451 10,232    
Cash and cash equivalents 10,451 10,232    
Short-term marketable securities 0 0    
Long-term marketable securities 0 0    
Level 1        
Schedule of Available-for-sale Securities [Line Items]        
Adjusted Cost [1] 3,107 4,077    
Unrealized Gains [1] 0 1    
Unrealized Losses [1] (163) (132)    
Fair Value [1] 2,944 3,946    
Cash and cash equivalents [1] 1,007 1,546    
Short-term marketable securities [1] 1,937 2,400    
Long-term marketable securities [1] 0 0    
Level 1 | Money market funds        
Schedule of Available-for-sale Securities [Line Items]        
Adjusted Cost [1] 1,007 1,546    
Unrealized Gains [1] 0 0    
Unrealized Losses [1] 0 0    
Fair Value [1] 1,007 1,546    
Cash and cash equivalents [1] 1,007 1,546    
Short-term marketable securities [1] 0 0    
Long-term marketable securities [1] 0 0    
Level 1 | Mutual funds        
Schedule of Available-for-sale Securities [Line Items]        
Adjusted Cost [1] 2,100 2,531    
Unrealized Gains [1] 0 1    
Unrealized Losses [1] (163) (132)    
Fair Value [1] 1,937 2,400    
Cash and cash equivalents [1] 0 0    
Short-term marketable securities [1] 1,937 2,400    
Long-term marketable securities [1] 0 0    
Level 2        
Schedule of Available-for-sale Securities [Line Items]        
Adjusted Cost [2] 189,797 141,023    
Unrealized Gains [2] 395 417    
Unrealized Losses [2] (739) (379)    
Fair Value [2] 189,453 141,061    
Cash and cash equivalents [2] 3,861 2,066    
Short-term marketable securities [2] 17,447 8,833    
Long-term marketable securities [2] 168,145 130,162    
Level 2 | U.S. Treasury securities        
Schedule of Available-for-sale Securities [Line Items]        
Adjusted Cost [2] 41,788 23,140    
Unrealized Gains [2] 76 15    
Unrealized Losses [2] (50) (9)    
Fair Value [2] 41,814 23,146    
Cash and cash equivalents [2] 68 12    
Short-term marketable securities [2] 1,379 607    
Long-term marketable securities [2] 40,367 22,527    
Level 2 | U.S. agency securities        
Schedule of Available-for-sale Securities [Line Items]        
Adjusted Cost [2] 5,719 7,373    
Unrealized Gains [2] 8 3    
Unrealized Losses [2] (2) (11)    
Fair Value [2] 5,725 7,365    
Cash and cash equivalents [2] 683 652    
Short-term marketable securities [2] 580 157    
Long-term marketable securities [2] 4,462 6,556    
Level 2 | Non-U.S. government securities        
Schedule of Available-for-sale Securities [Line Items]        
Adjusted Cost [2] 6,662 6,925    
Unrealized Gains [2] 46 69    
Unrealized Losses [2] (105) (69)    
Fair Value [2] 6,603 6,925    
Cash and cash equivalents [2] 7 0    
Short-term marketable securities [2] 219 204    
Long-term marketable securities [2] 6,377 6,721    
Level 2 | Certificates of deposit and time deposits        
Schedule of Available-for-sale Securities [Line Items]        
Adjusted Cost [2] 4,367 3,832    
Unrealized Gains [2] 0 0    
Unrealized Losses [2] 0 0    
Fair Value [2] 4,367 3,832    
Cash and cash equivalents [2] 1,939 1,230    
Short-term marketable securities [2] 1,439 1,233    
Long-term marketable securities [2] 989 1,369    
Level 2 | Commercial paper        
Schedule of Available-for-sale Securities [Line Items]        
Adjusted Cost [2] 2,997 475    
Unrealized Gains [2] 0 0    
Unrealized Losses [2] 0 0    
Fair Value [2] 2,997 475    
Cash and cash equivalents [2] 1,133 166    
Short-term marketable securities [2] 1,864 309    
Long-term marketable securities [2] 0 0    
Level 2 | Corporate securities        
Schedule of Available-for-sale Securities [Line Items]        
Adjusted Cost [2] 111,128 85,431    
Unrealized Gains [2] 227 296    
Unrealized Losses [2] (514) (241)    
Fair Value [2] 110,841 85,486    
Cash and cash equivalents [2] 31 6    
Short-term marketable securities [2] 11,885 6,298    
Long-term marketable securities [2] 98,925 79,182    
Level 2 | Municipal securities        
Schedule of Available-for-sale Securities [Line Items]        
Adjusted Cost [2] 945 940    
Unrealized Gains [2] 3 8    
Unrealized Losses [2] (2) 0    
Fair Value [2] 946 948    
Cash and cash equivalents [2] 0 0    
Short-term marketable securities [2] 43 0    
Long-term marketable securities [2] 903 948    
Level 2 | Mortgage- and asset-backed securities        
Schedule of Available-for-sale Securities [Line Items]        
Adjusted Cost [2] 16,191 12,907    
Unrealized Gains [2] 35 26    
Unrealized Losses [2] (66) (49)    
Fair Value [2] 16,160 12,884    
Cash and cash equivalents [2] 0 0    
Short-term marketable securities [2] 38 25    
Long-term marketable securities [2] $ 16,122 $ 12,859    
[1] The fair value of Level 1 securities is estimated based on quoted prices in active markets for identical assets or liabilities.
[2] The fair value of Level 2 securities is estimated based on observable inputs other than quoted prices in active markets for identical assets and liabilities, quoted prices for identical or similar assets or liabilities in inactive markets, or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities.