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Financial Instruments - Additional Information (Details)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Jun. 27, 2020
USD ($)
Vendor
Customer
Jun. 27, 2020
USD ($)
Vendor
Customer
Sep. 28, 2019
USD ($)
Customer
Vendor
Financial Instruments [Line Items]      
Non-marketable equity securities, carrying value $ 2,800 $ 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) 119 $ 373  
Amounts excluded from the effectiveness assessment of the Company’s hedges and recognized in OCI, gains/(losses) (220) (51)  
Potential reduction to derivative assets resulting from rights of set-off under master netting arrangements 3,300 3,300 2,700
Potential reduction to derivative liabilities resulting from rights of set-off under master netting arrangements 3,300 3,300 2,700
Net derivative assets/(liabilities) after potential reductions under master netting arrangements $ (197) $ (197) $ (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   32.00% 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 3 3 2
Non-trade receivables | Credit concentration risk | Vendor one      
Financial Instruments [Line Items]      
Concentration risk, percentage   49.00% 59.00%
Non-trade receivables | Credit concentration risk | Vendor two      
Financial Instruments [Line Items]      
Concentration risk, percentage   18.00% 14.00%
Non-trade receivables | Credit concentration risk | Vendor Three      
Financial Instruments [Line Items]      
Concentration risk, percentage   11.00%  
Other current liabilities      
Financial Instruments [Line Items]      
Net cash collateral received, derivative instruments $ 1,200 $ 1,200 $ 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