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Financial Instruments - Additional Information (Details) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jun. 26, 2021 USD ($) Vendor Customer | Dec. 26, 2020 | Jun. 27, 2020 USD ($) | Jun. 26, 2021 USD ($) Vendor Customer | Jun. 27, 2020 USD ($) | Sep. 26, 2020 USD ($) Customer Vendor
Financial Instruments [Line Items] |  |  |  |  |  |
Non-marketable equity securities, carrying value | $ 2,800 |  |  | $ 2,800 |  | $ 2,800
Hedged interest rate transactions, expected recognition period |  |  |  | 6 years |  |
Amounts excluded from the effectiveness assessment of fair value hedges and recognized in OI&E, gains/(losses) | 57 |  | $ 119 | $ 199 | $ 373 |
Amounts excluded from the effectiveness assessment of the Company’s hedges and recognized in OCI, gains/(losses) | 63 |  | $ (220) | (34) | $ (51) |
Net cash collateral received, derivative instruments | 576 |  |  | 576 |  | 875
Potential reduction to derivative assets resulting from rights of set-off under master netting arrangements | 2,200 |  |  | 2,200 |  | 2,800
Potential reduction to derivative liabilities resulting from rights of set-off under master netting arrangements | 2,200 |  |  | 2,200 |  | 2,800
Net derivative assets/(liabilities) after potential reductions under master netting arrangements | $ 6 |  |  | $ 6 |  | $ (312)
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 |  |  |  | 36.00% |  |
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 |  | 57.00% |  | 56.00% |  |
Non-trade receivables | Credit concentration risk | Vendor two |  |  |  |  |  |
Financial Instruments [Line Items] |  |  |  |  |  |
Concentration risk, percentage |  | 11.00% |  | 13.00% |  |
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 |  |  |  | 21 years |  |

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