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Financial Instruments - Additional Information (Details) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2018 USD ($) Vendor Customer | Jul. 01, 2017 USD ($) | Jun. 30, 2018 USD ($) Vendor Customer | Jul. 01, 2017 USD ($) | 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 |  |  | 9 years |  |
Potential reduction to derivative assets resulting from rights of set-off under master netting arrangements | $ 1,500 |  | $ 1,500 |  | $ 1,400
Potential reduction to derivative liabilities resulting from rights of set-off under master netting arrangements | 1,500 |  | 1,500 |  | 1,400
Net derivative assets/(liabilities) after potential reductions under master netting arrangements | $ (403) |  | $ (403) |  | $ 32
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 |  | 2
Trade receivables | Credit concentration risk | Customer one |  |  |  |  |
Financial Instruments [Line Items] |  |  |  |  |
Concentration risk, percentage |  |  |  |  | 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 |  |  | 45.00% |  | 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 | 3 |  | 3 |  | 3
Non-trade receivables | Credit concentration risk | Vendor one |  |  |  |  |
Financial Instruments [Line Items] |  |  |  |  |
Concentration risk, percentage |  |  | 54.00% |  | 42.00%
Non-trade receivables | Credit concentration risk | Vendor two |  |  |  |  |
Financial Instruments [Line Items] |  |  |  |  |
Concentration risk, percentage |  |  | 12.00% |  | 19.00%
Non-trade receivables | Credit concentration risk | Vendor three |  |  |  |  |
Financial Instruments [Line Items] |  |  |  |  |
Concentration risk, percentage |  |  | 11.00% |  | 10.00%
Other current assets |  |  |  |  |
Financial Instruments [Line Items] |  |  |  |  |
Net cash collateral posted, derivative instruments | $ 211 |  | $ 211 |  |
Accrued expenses |  |  |  |  |
Financial Instruments [Line Items] |  |  |  |  |
Net cash collateral received, derivative instruments |  |  |  |  | $ 35
Derivatives not designated as accounting hedges | Net sales |  |  |  |  |
Financial Instruments [Line Items] |  |  |  |  |
Non-designated derivatives, fair value adjustment gains/(losses) | 135 | $ (77) | (7) | $ 129 |
Derivatives not designated as accounting hedges | Cost of sales |  |  |  |  |
Financial Instruments [Line Items] |  |  |  |  |
Non-designated derivatives, fair value adjustment gains/(losses) | 151 | 12 | (61) | 91 |
Derivatives not designated as accounting hedges | Other income/(expense), net |  |  |  |  |
Financial Instruments [Line Items] |  |  |  |  |
Non-designated derivatives, fair value adjustment gains/(losses) | $ 254 | $ 49 | $ (119) | $ 481 |
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 |  |  | 24 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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