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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
Jun. 25, 2016
Sep. 26, 2015
Jun. 27, 2015
Sep. 27, 2014
Schedule of Available-for-sale Securities [Line Items]        
Adjusted cost $ 230,250 $ 206,420    
Unrealized gains 1,977 574    
Unrealized losses (707) (1,328)    
Fair value 231,520 205,666    
Cash and cash equivalents 18,237 21,120 $ 15,319 $ 13,844
Short-term marketable securities 43,519 20,481    
Long-term marketable securities 169,764 164,065    
Cash        
Schedule of Available-for-sale Securities [Line Items]        
Adjusted cost 9,118 11,389    
Unrealized gains 0 0    
Unrealized losses 0 0    
Fair value 9,118 11,389    
Cash and cash equivalents 9,118 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 5,090 3,570    
Unrealized gains 0 0    
Unrealized losses (185) (144)    
Fair value 4,905 3,426    
Cash and cash equivalents 3,318 1,798    
Short-term marketable securities 1,587 1,628    
Long-term marketable securities 0 0    
Level 1 | Money market funds        
Schedule of Available-for-sale Securities [Line Items]        
Adjusted cost 3,318 1,798    
Unrealized gains 0 0    
Unrealized losses 0 0    
Fair value 3,318 1,798    
Cash and cash equivalents 3,318 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 1,772 1,772    
Unrealized gains 0 0    
Unrealized losses (185) (144)    
Fair value 1,587 1,628    
Cash and cash equivalents 0 0    
Short-term marketable securities 1,587 1,628    
Long-term marketable securities 0 0    
Level 2        
Schedule of Available-for-sale Securities [Line Items]        
Adjusted cost 216,042 191,461    
Unrealized gains 1,977 574    
Unrealized losses (522) (1,184)    
Fair value 217,497 190,851    
Cash and cash equivalents 5,801 7,933    
Short-term marketable securities 41,932 18,853    
Long-term marketable securities 169,764 164,065    
Level 2 | U.S. Treasury securities        
Schedule of Available-for-sale Securities [Line Items]        
Adjusted cost 45,583 34,902    
Unrealized gains 416 181    
Unrealized losses (1) (1)    
Fair value 45,998 35,082    
Cash and cash equivalents 833 0    
Short-term marketable securities 17,209 3,498    
Long-term marketable securities 27,956 31,584    
Level 2 | U.S. agency securities        
Schedule of Available-for-sale Securities [Line Items]        
Adjusted cost 7,490 5,864    
Unrealized gains 21 14    
Unrealized losses 0 0    
Fair value 7,511 5,878    
Cash and cash equivalents 1,832 841    
Short-term marketable securities 2,539 767    
Long-term marketable securities 3,140 4,270    
Level 2 | Non-U.S. government securities        
Schedule of Available-for-sale Securities [Line Items]        
Adjusted cost 7,101 6,356    
Unrealized gains 139 45    
Unrealized losses (63) (167)    
Fair value 7,177 6,234    
Cash and cash equivalents 50 43    
Short-term marketable securities 685 135    
Long-term marketable securities 6,442 6,056    
Level 2 | Certificates of deposit and time deposits        
Schedule of Available-for-sale Securities [Line Items]        
Adjusted cost 3,729 4,347    
Unrealized gains 0 0    
Unrealized losses 0 0    
Fair value 3,729 4,347    
Cash and cash equivalents 314 2,065    
Short-term marketable securities 1,493 1,405    
Long-term marketable securities 1,922 877    
Level 2 | Commercial paper        
Schedule of Available-for-sale Securities [Line Items]        
Adjusted cost 4,708 6,016    
Unrealized gains 0 0    
Unrealized losses 0 0    
Fair value 4,708 6,016    
Cash and cash equivalents 2,772 4,981    
Short-term marketable securities 1,936 1,035    
Long-term marketable securities 0 0    
Level 2 | Corporate securities        
Schedule of Available-for-sale Securities [Line Items]        
Adjusted cost 128,146 116,908    
Unrealized gains 1,185 242    
Unrealized losses (433) (985)    
Fair value 128,898 116,165    
Cash and cash equivalents 0 3    
Short-term marketable securities 17,883 11,948    
Long-term marketable securities 111,015 104,214    
Level 2 | Municipal securities        
Schedule of Available-for-sale Securities [Line Items]        
Adjusted cost 952 947    
Unrealized gains 9 5    
Unrealized losses 0 0    
Fair value 961 952    
Cash and cash equivalents 0 0    
Short-term marketable securities 127 48    
Long-term marketable securities 834 904    
Level 2 | Mortgage- and asset-backed securities        
Schedule of Available-for-sale Securities [Line Items]        
Adjusted cost 18,333 16,121    
Unrealized gains 207 87    
Unrealized losses (25) (31)    
Fair value 18,515 16,177    
Cash and cash equivalents 0 0    
Short-term marketable securities 60 17    
Long-term marketable securities $ 18,455 $ 16,160