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Financial Instruments - Additional Information (Details) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 29, 2018 USD ($) Customer Vendor | Sep. 29, 2018 USD ($) Customer Vendor
Financial Instruments [Line Items] |  |
Non-marketable equity securities, carrying value | $ 2,200 |
Non-marketable debt security, amortized cost basis and carrying value | $ 1,500 |
Hedged interest rate transactions, expected recognition period | 9 years |
Potential reduction to derivative assets resulting from rights of set-off under master netting arrangements | $ 1,900 | $ 2,100
Potential reduction to derivative liabilities resulting from rights of set-off under master netting arrangements | 1,900 | 2,100
Net derivative assets/(liabilities) after potential reductions under master netting arrangements | $ (260) | $ 138
Trade receivables | Credit concentration risk |  |
Financial Instruments [Line Items] |  |
Number of customers that individually represented 10% or more of total trade receivables | Customer | 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 | 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 | 2 | 2
Non-trade receivables | Credit concentration risk | Vendor one |  |
Financial Instruments [Line Items] |  |
Concentration risk, percentage | 56.00% | 62.00%
Non-trade receivables | Credit concentration risk | Vendor two |  |
Financial Instruments [Line Items] |  |
Concentration risk, percentage | 15.00% | 12.00%
Other current assets |  |
Financial Instruments [Line Items] |  |
Net cash collateral posted, derivative instruments | $ 56 | $ 1,000
Derivatives not designated as accounting hedges | Net sales |  |
Financial Instruments [Line Items] |  |
Non-designated derivatives, fair value adjustment gains/(losses) | 255 |
Derivatives not designated as accounting hedges | Total cost of sales |  |
Financial Instruments [Line Items] |  |
Non-designated derivatives, fair value adjustment gains/(losses) | 175 |
Derivatives not designated as accounting hedges | Other income/(expense), net |  |
Financial Instruments [Line Items] |  |
Non-designated derivatives, fair value adjustment gains/(losses) | $ 723 |
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 | 24 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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