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Financial Instruments - Additional Information (Details) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 29, 2019 USD ($) Vendor Customer | Jun. 30, 2018 USD ($) | Jun. 29, 2019 USD ($) Vendor Customer | Jun. 30, 2018 USD ($) | Sep. 29, 2018 USD ($) Vendor Customer
Financial Instruments [Line Items] |  |  |  |  |
Non-marketable equity securities, carrying value | $ 2,400 |  | $ 2,400 |  |
Hedged interest rate transactions, expected recognition period |  |  | 8 years |  |
Fair value hedges, gains/(losses) excluded from effectiveness testing | 171 |  | $ 645 |  |
Potential reduction to derivative assets resulting from rights of set-off under master netting arrangements | 1,800 |  | 1,800 |  | $ 2,100
Potential reduction to derivative liabilities resulting from rights of set-off under master netting arrangements | 1,800 |  | 1,800 |  | 2,100
Net derivative assets/(liabilities) after potential reductions under master netting arrangements | $ (14) |  | $ (14) |  | $ 138
Trade receivables | Credit concentration risk |  |  |  |  |
Financial Instruments [Line Items] |  |  |  |  |
Number of customers that individually represented 10% or more of total trade receivables | Customer | 1 |  | 1 |  | 1
Trade receivables | Credit concentration risk | Customer one |  |  |  |  |
Financial Instruments [Line Items] |  |  |  |  |
Concentration risk, percentage |  |  | 11.00% |  | 10.00%
Trade receivables | Credit concentration risk | Cellular network carriers |  |  |  |  |
Financial Instruments [Line Items] |  |  |  |  |
Concentration risk, percentage |  |  | 42.00% |  | 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 |  | 2
Non-trade receivables | Credit concentration risk | Vendor one |  |  |  |  |
Financial Instruments [Line Items] |  |  |  |  |
Concentration risk, percentage |  |  | 57.00% |  | 62.00%
Non-trade receivables | Credit concentration risk | Vendor two |  |  |  |  |
Financial Instruments [Line Items] |  |  |  |  |
Concentration risk, percentage |  |  | 12.00% |  | 12.00%
Non-trade receivables | Credit concentration risk | Vendor three |  |  |  |  |
Financial Instruments [Line Items] |  |  |  |  |
Concentration risk, percentage |  |  | 12.00% |  |
Other current assets |  |  |  |  |
Financial Instruments [Line Items] |  |  |  |  |
Net cash collateral posted, derivative instruments |  |  |  |  | $ 1,000
Other current liabilities |  |  |  |  |
Financial Instruments [Line Items] |  |  |  |  |
Net cash collateral received, derivative instruments | $ 603 |  | $ 603 |  |
Net sales |  |  |  |  |
Financial Instruments [Line Items] |  |  |  |  |
Non-designated derivatives, fair value adjustment gains/(losses) | 58 | $ 135 | 283 | $ (7) |
Cost of sales |  |  |  |  |
Financial Instruments [Line Items] |  |  |  |  |
Non-designated derivatives, fair value adjustment gains/(losses) | 40 | 151 | 108 | (61) |
Other income/(expense), net |  |  |  |  |
Financial Instruments [Line Items] |  |  |  |  |
Non-designated derivatives, fair value adjustment gains/(losses) | $ (34) | $ 132 | $ (58) | $ (241) |
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 and marketable securities |  |  |  |  |
Financial Instruments [Line Items] |  |  |  |  |
Hedged foreign currency transactions, expected recognition period |  |  | 23 years |  |
Minimum |  |  |  |  |
Financial Instruments [Line Items] |  |  |  |  |
General maturities of long-term marketable securities |  |  | 1 year |  |
Maximum |  |  |  |  |
Financial Instruments [Line Items] |  |  |  |  |
General maturities of long-term marketable securities |  |  | 5 years |  |

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