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Financial Instruments - Additional Information (Details) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 28, 2020 USD ($) Vendor Customer | Mar. 28, 2020 USD ($) Vendor Customer | Sep. 28, 2019 USD ($) Vendor Customer
Financial Instruments [Line Items] |  |  |
Non-marketable equity securities, carrying value | $ 2,800 | $ 2,800 | $ 2,900
Hedged interest rate transactions, expected recognition period |  | 8 years |
Amounts excluded from the effectiveness assessment of fair value hedges and recognized in OI&E, gains/(losses) | 126 | $ 254 |
Amounts excluded from the effectiveness assessment of the Company’s hedges and recognized in OCI, gains/(losses) | 258 | 169 |
Potential reduction to derivative assets resulting from rights of set-off under master netting arrangements | 6,400 | 6,400 | 2,700
Potential reduction to derivative liabilities resulting from rights of set-off under master netting arrangements | 6,400 | 6,400 | 2,700
Net derivative assets/(liabilities) after potential reductions under master netting arrangements | $ (279) | $ (279) | $ (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 | 0
Trade receivables | Credit concentration risk | Cellular network carriers |  |  |
Financial Instruments [Line Items] |  |  |
Concentration risk, percentage |  | 41.00% | 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 | 2
Non-trade receivables | Credit concentration risk | Vendor one |  |  |
Financial Instruments [Line Items] |  |  |
Concentration risk, percentage |  | 53.00% | 59.00%
Non-trade receivables | Credit concentration risk | Vendor two |  |  |
Financial Instruments [Line Items] |  |  |
Concentration risk, percentage |  | 16.00% | 14.00%
Other current liabilities |  |  |
Financial Instruments [Line Items] |  |  |
Net cash collateral received, derivative instruments | $ 2,000 | $ 2,000 | $ 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 |  | 22 years |
Minimum |  |  |
Financial Instruments [Line Items] |  |  |
General maturities of non-current marketable securities |  | 1 year |
Maximum |  |  |
Financial Instruments [Line Items] |  |  |
General maturities of non-current marketable securities |  | 5 years |

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