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Financial Instruments - Additional Information (Details)
$ in Millions
12 Months Ended
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