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Financial Instruments - 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
Sep. 24, 2016
Sep. 26, 2015
Sep. 27, 2014
Sep. 28, 2013
Schedule of Available-for-sale Securities [Line Items]        
Adjusted Cost $ 235,810 $ 206,420    
Unrealized Gains 2,186 574    
Unrealized Losses (411) (1,328)    
Fair Value 237,585 205,666    
Cash and cash equivalents 20,484 21,120 $ 13,844 $ 14,259
Short-term marketable securities 46,671 20,481    
Long-term marketable securities 170,430 164,065    
Cash        
Schedule of Available-for-sale Securities [Line Items]        
Adjusted Cost 8,601 11,389    
Unrealized Gains 0 0    
Unrealized Losses 0 0    
Fair Value 8,601 11,389    
Cash and cash equivalents 8,601 11,389    
Short-term marketable securities 0 0    
Long-term marketable securities 0 0    
Level 1        
Schedule of Available-for-sale Securities [Line Items]        
Adjusted Cost 5,073 3,570    
Unrealized Gains 0 0    
Unrealized Losses (146) (144)    
Fair Value 4,927 3,426    
Cash and cash equivalents 3,666 1,798    
Short-term marketable securities 1,261 1,628    
Long-term marketable securities 0 0    
Level 1 | Money market funds        
Schedule of Available-for-sale Securities [Line Items]        
Adjusted Cost 3,666 1,798    
Unrealized Gains 0 0    
Unrealized Losses 0 0    
Fair Value 3,666 1,798    
Cash and cash equivalents 3,666 1,798    
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 1,407 1,772    
Unrealized Gains 0 0    
Unrealized Losses (146) (144)    
Fair Value 1,261 1,628    
Cash and cash equivalents 0 0    
Short-term marketable securities 1,261 1,628    
Long-term marketable securities 0 0    
Level 2        
Schedule of Available-for-sale Securities [Line Items]        
Adjusted Cost 222,136 191,461    
Unrealized Gains 2,186 574    
Unrealized Losses (265) (1,184)    
Fair Value 224,057 190,851    
Cash and cash equivalents 8,217 7,933    
Short-term marketable securities 45,410 18,853    
Long-term marketable securities 170,430 164,065    
Level 2 | U.S. Treasury securities        
Schedule of Available-for-sale Securities [Line Items]        
Adjusted Cost 41,697 34,902    
Unrealized Gains 319 181    
Unrealized Losses (4) (1)    
Fair Value 42,012 35,082    
Cash and cash equivalents 1,527 0    
Short-term marketable securities 13,492 3,498    
Long-term marketable securities 26,993 31,584    
Level 2 | U.S. agency securities        
Schedule of Available-for-sale Securities [Line Items]        
Adjusted Cost 7,543 5,864    
Unrealized Gains 16 14    
Unrealized Losses 0 0    
Fair Value 7,559 5,878    
Cash and cash equivalents 2,762 841    
Short-term marketable securities 2,441 767    
Long-term marketable securities 2,356 4,270    
Level 2 | Non-U.S. government securities        
Schedule of Available-for-sale Securities [Line Items]        
Adjusted Cost 7,609 6,356    
Unrealized Gains 259 45    
Unrealized Losses (27) (167)    
Fair Value 7,841 6,234    
Cash and cash equivalents 110 43    
Short-term marketable securities 818 135    
Long-term marketable securities 6,913 6,056    
Level 2 | Certificates of deposit and time deposits        
Schedule of Available-for-sale Securities [Line Items]        
Adjusted Cost 6,598 4,347    
Unrealized Gains 0 0    
Unrealized Losses 0 0    
Fair Value 6,598 4,347    
Cash and cash equivalents 1,108 2,065    
Short-term marketable securities 3,897 1,405    
Long-term marketable securities 1,593 877    
Level 2 | Commercial paper        
Schedule of Available-for-sale Securities [Line Items]        
Adjusted Cost 7,433 6,016    
Unrealized Gains 0 0    
Unrealized Losses 0 0    
Fair Value 7,433 6,016    
Cash and cash equivalents 2,468 4,981    
Short-term marketable securities 4,965 1,035    
Long-term marketable securities 0 0    
Level 2 | Corporate securities        
Schedule of Available-for-sale Securities [Line Items]        
Adjusted Cost 131,166 116,908    
Unrealized Gains 1,409 242    
Unrealized Losses (206) (985)    
Fair Value 132,369 116,165    
Cash and cash equivalents 242 3    
Short-term marketable securities 19,599 11,948    
Long-term marketable securities 112,528 104,214    
Level 2 | Municipal securities        
Schedule of Available-for-sale Securities [Line Items]        
Adjusted Cost 956 947    
Unrealized Gains 5 5    
Unrealized Losses 0 0    
Fair Value 961 952    
Cash and cash equivalents 0 0    
Short-term marketable securities 167 48    
Long-term marketable securities 794 904    
Level 2 | Mortgage- and asset-backed securities        
Schedule of Available-for-sale Securities [Line Items]        
Adjusted Cost 19,134 16,121    
Unrealized Gains 178 87    
Unrealized Losses (28) (31)    
Fair Value 19,284 16,177    
Cash and cash equivalents 0 0    
Short-term marketable securities 31 17    
Long-term marketable securities $ 19,253 $ 16,160