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Financial Instruments - Additional Information (Details) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 30, 2017 USD ($) Vendor Customer | Dec. 31, 2016 USD ($) | Sep. 30, 2017 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 interest rate transactions, expected recognition period | 10 years |  |
Potential reduction to derivative assets resulting from rights of set-off under master netting arrangements | $ 1,300 |  | $ 1,400
Potential reduction to derivative liabilities resulting from rights of set-off under master netting arrangements | 1,300 |  | 1,400
Net derivative assets/(liabilities) after potential reductions under master netting arrangements | $ (66) |  | $ 32
Trade receivables | Credit concentration risk |  |  |
Financial Instruments [Line Items] |  |  |
Number of customers that individually represented 10% or more of total trade receivables | Customer | 1 |  | 2
Trade receivables | Credit concentration risk | Customer one |  |  |
Financial Instruments [Line Items] |  |  |
Concentration risk, percentage | 11.00% |  | 10.00%
Trade receivables | Credit concentration risk | Customer two |  |  |
Financial Instruments [Line Items] |  |  |
Concentration risk, percentage |  |  | 10.00%
Trade receivables | Credit concentration risk | Cellular network carriers |  |  |
Financial Instruments [Line Items] |  |  |
Concentration risk, percentage | 57.00% |  | 59.00%
Non-trade receivables | Credit concentration risk |  |  |
Financial Instruments [Line Items] |  |  |
Number of vendors that individually represented 10% or more of total vendor non-trade receivables | Vendor | 1 |  | 3
Non-trade receivables | Credit concentration risk | Vendor one |  |  |
Financial Instruments [Line Items] |  |  |
Concentration risk, percentage | 66.00% |  | 42.00%
Non-trade receivables | Credit concentration risk | Vendor two |  |  |
Financial Instruments [Line Items] |  |  |
Concentration risk, percentage |  |  | 19.00%
Non-trade receivables | Credit concentration risk | Vendor three |  |  |
Financial Instruments [Line Items] |  |  |
Concentration risk, percentage |  |  | 10.00%
Accrued expenses |  |  |
Financial Instruments [Line Items] |  |  |
Net cash collateral received, derivative instruments | $ 230 |  | $ 35
Derivatives not designated as accounting hedges | Net sales |  |  |
Financial Instruments [Line Items] |  |  |
Non-designated derivatives, fair value adjustment gains/(losses) |  | $ 273 |
Derivatives not designated as accounting hedges | Cost of sales |  |  |
Financial Instruments [Line Items] |  |  |
Non-designated derivatives, fair value adjustment gains/(losses) |  | 332 |
Derivatives not designated as accounting hedges | Other income/(expense), net |  |  |
Financial Instruments [Line Items] |  |  |
Non-designated derivatives, fair value adjustment gains/(losses) |  | $ 508 |
Hedges of foreign currency exposure associated with revenue and inventory purchases |  |  |
Financial Instruments [Line Items] |  |  |
Hedged foreign currency transactions, expected recognition period | 12 months |  |
Hedges of foreign currency exposure associated with term debt |  |  |
Financial Instruments [Line Items] |  |  |
Hedged foreign currency transactions, expected recognition period | 25 years |  |

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- Definition The potential effects of rights of set-off associated with the Company's derivative contracts, including the effects of collateral, which would result in a reduction to derivative assets. + References No definition available. + Details
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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=84177426&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=77997519&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=84177426&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=77997519&loc=d3e13537-108611 + Details
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