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Financial Instruments - Additional Information (Details) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 26, 2020 USD ($) Customer Vendor | Dec. 28, 2019 USD ($) | Sep. 26, 2020 USD ($) Vendor Customer
Financial Instruments [Line Items] |  |  |
Non-marketable equity securities, carrying value | $ 2,500 |  | $ 2,800
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) | $ 82 | $ 128 |
Amounts excluded from the effectiveness assessment of the Company’s hedges and recognized in OCI, gains/(losses) | (138) | $ (89) |
Net cash collateral posted, derivative instruments | 215 |  |
Net cash collateral received, derivative instruments |  |  | 875
Potential reduction to derivative assets resulting from rights of set-off under master netting arrangements | 3,500 |  | 2,800
Potential reduction to derivative liabilities resulting from rights of set-off under master netting arrangements | 3,500 |  | 2,800
Net derivative assets/(liabilities) after potential reductions under master netting arrangements | $ (684) |  | $ (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
Trade receivables | Credit concentration risk | Cellular network carriers |  |  |
Financial Instruments [Line Items] |  |  |
Concentration risk, percentage | 41.00% |  |
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 | 61.00% |  | 57.00%
Non-trade receivables | Credit concentration risk | Vendor two |  |  |
Financial Instruments [Line Items] |  |  |
Concentration risk, percentage | 14.00% |  | 11.00%
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 non-current marketable securities | 1 year |  |
Maximum |  |  |
Financial Instruments [Line Items] |  |  |
General maturities of non-current marketable securities | 5 years |  |

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