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Financial Instruments - Additional Information (Details) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jul. 01, 2017 USD ($) Customer | Jul. 01, 2017 USD ($) Customer | Sep. 24, 2016 USD ($) 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 |
Potential reduction to derivative assets resulting from rights of set-off under master netting arrangements | $ 1,300 | $ 1,300 | $ 1,500
Potential reduction to derivative liabilities resulting from rights of set-off under master netting arrangements | 1,300 | 1,300 | 1,500
Net derivative assets/(liabilities) after potential reductions under master netting arrangements | $ (326) | $ (326) | $ 160
Trade receivables | Credit concentration risk |  |  |
Financial Instruments [Line Items] |  |  |
Number of customers that individually represented 10% or more of total trade receivables | Customer | 0 | 0 | 1
Trade receivables | Credit concentration risk | Customer one |  |  |
Financial Instruments [Line Items] |  |  |
Concentration risk, percentage |  |  | 10.00%
Trade receivables | Credit concentration risk | Cellular network carriers |  |  |
Financial Instruments [Line Items] |  |  |
Concentration risk, percentage |  | 46.00% | 63.00%
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 | Customer | 3 | 3 | 2
Non-trade receivables | Credit concentration risk | Vendor one |  |  |
Financial Instruments [Line Items] |  |  |
Concentration risk, percentage |  | 39.00% | 47.00%
Non-trade receivables | Credit concentration risk | Vendor two |  |  |
Financial Instruments [Line Items] |  |  |
Concentration risk, percentage |  | 19.00% | 21.00%
Non-trade receivables | Credit concentration risk | Vendor three |  |  |
Financial Instruments [Line Items] |  |  |
Concentration risk, percentage |  | 16.00% |
Other current assets |  |  |
Financial Instruments [Line Items] |  |  |
Net cash collateral posted, derivative instruments | $ 162 | $ 162 |
Accrued expenses |  |  |
Financial Instruments [Line Items] |  |  |
Net cash collateral received, derivative instruments |  |  | $ 163
Derivatives not designated as accounting hedges | Net sales |  |  |
Financial Instruments [Line Items] |  |  |
Non-designated derivatives, fair value adjustment gains/(losses) | (77) | 129 |
Derivatives not designated as accounting hedges | Cost of sales |  |  |
Financial Instruments [Line Items] |  |  |
Non-designated derivatives, fair value adjustment gains/(losses) | 12 | 91 |
Derivatives not designated as accounting hedges | Other income/(expense), net |  |  |
Financial Instruments [Line Items] |  |  |
Non-designated derivatives, fair value adjustment gains/(losses) | $ 49 | $ 481 |

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