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Financial Instruments - Additional Information (Detail) $ in Millions | 12 Months Ended
--- | ---
Sep. 26, 2015 USD ($) Vendor Customer | Sep. 27, 2014 USD ($) Vendor Customer
Financial Instruments [Line Items] |  |
Maturities of long-term marketable securities, minimum | 1 year |
Maturities of long-term marketable securities, maximum | 5 years |
Hedged foreign currency transactions, typical term | 12 months |
Hedged interest rate transactions, expected period to be recognized | 10 years |
Net cash collateral received, derivative instruments | $ 1,000 | $ 2,100
Reduction to derivative assets by rights of set-off associated with derivative contracts | 2,200 | 1,600
Reduction to derivative liabilities by rights of set-off associated with derivative contracts | 2,200 | 1,600
Net derivative assets (liabilities) | $ (78) | $ (549)
Number of customers representing 10% or more of trade receivables | Customer | 1 | 2
Number of vendors representing a significant portion of non-trade receivables | Vendor | 3 | 3
Trade Receivables | Credit Concentration Risk | Customer One |  |
Financial Instruments [Line Items] |  |
Concentration risk, percentage | 12.00% | 16.00%
Trade Receivables | Credit Concentration Risk | Customer Two |  |
Financial Instruments [Line Items] |  |
Concentration risk, percentage |  | 13.00%
Trade Receivables | Credit Concentration Risk | Cellular Network Carriers |  |
Financial Instruments [Line Items] |  |
Concentration risk, percentage | 71.00% | 72.00%
Non-Trade Receivables | Credit Concentration Risk | Vendor One |  |
Financial Instruments [Line Items] |  |
Concentration risk, percentage | 38.00% | 51.00%
Non-Trade Receivables | Credit Concentration Risk | Vendor Two |  |
Financial Instruments [Line Items] |  |
Concentration risk, percentage | 18.00% | 16.00%
Non-Trade Receivables | Credit Concentration Risk | Vendor Three |  |
Financial Instruments [Line Items] |  |
Concentration risk, percentage | 14.00% | 14.00%

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- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=51801978&loc=d3e6351-108592 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13531-108611 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=51801978&loc=d3e6404-108592 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13537-108611 + Details
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