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Financial Instruments - Additional Information (Details) $ in Millions | 12 Months Ended
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Sep. 28, 2019 USD ($) Vendor Customer | Sep. 29, 2018 USD ($) Vendor Customer
Financial Instruments [Line Items] |  |
Non-marketable equity securities, carrying value | $ 2,900 |
Hedged interest rate transactions, expected recognition period | 8 years |
Fair value hedges, gains/(losses) excluded from effectiveness testing | $ 777 |
Potential reduction to derivative assets resulting from rights of set-off under master netting arrangements | 2,700 | $ 2,100
Potential reduction to derivative liabilities resulting from rights of set-off under master netting arrangements | 2,700 | 2,100
Net derivative assets/(liabilities) after potential reductions under master netting arrangements | $ (407) | $ 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 | 0.00% | 10.00%
Trade receivables | Credit concentration risk | Cellular network carriers |  |
Financial Instruments [Line Items] |  |
Concentration risk, percentage | 51.00% | 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 | 59.00% | 62.00%
Non-trade receivables | Credit concentration risk | Vendor two |  |
Financial Instruments [Line Items] |  |
Concentration risk, percentage | 14.00% | 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 | $ 1,600 |
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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