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Financial Instruments - Additional Information (Details) $ in Millions | 12 Months Ended
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Sep. 26, 2020 USD ($) Customer Vendor | Sep. 28, 2019 USD ($) Customer Vendor
Financial Instruments [Line Items] |  |
Non-marketable equity securities, carrying value | $ 2,800 | $ 2,900
Hedged interest rate transactions, expected recognition period | 7 years |
Amounts excluded from the effectiveness assessment of fair value hedges and recognized in OI&E, gains/(losses) | $ 465 | 777
Amounts excluded from the effectiveness assessment of the Company’s hedges and recognized in OCI, gains/(losses) | (168) |
Net cash collateral received, derivative instruments | 875 | 1,600
Potential reduction to derivative assets resulting from rights of set-off under master netting arrangements | 2,800 | 2,700
Potential reduction to derivative liabilities resulting from rights of set-off under master netting arrangements | 2,800 | 2,700
Net derivative assets/(liabilities) after potential reductions under master netting arrangements | $ (312) | $ (407)
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
Trade receivables | Credit concentration risk | Cellular network carriers |  |
Financial Instruments [Line Items] |  |
Concentration risk, percentage |  | 51.00%
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 | 57.00% | 59.00%
Non-trade receivables | Credit concentration risk | Vendor two |  |
Financial Instruments [Line Items] |  |
Concentration risk, percentage | 11.00% | 14.00%
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 | 22 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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- Definition Maximum period of time the entity is hedging its exposure to variability in future cash flows for forecasted transactions, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Excludes forecasted transactions related to payment of variable interest on existing financial instruments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=121549185&loc=d3e80748-113994 + Details
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