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Financial Instruments - Additional Information (Details)
$ in Millions
12 Months Ended
Sep. 30, 2017
USD ($)
Vendor
Customer
Sep. 24, 2016
USD ($)
Vendor
Customer
Financial Instruments [Line Items]    
Maturities of long-term marketable securities, minimum 1 year  
Maturities of long-term marketable securities, maximum 5 years  
Hedged interest rate transactions, expected recognition period 10 years  
Potential reduction to derivative assets resulting from rights of set-off under master netting arrangements $ 1,400 $ 1,500
Potential reduction to derivative liabilities resulting from rights of set-off under master netting arrangements 1,400 1,500
Net derivative assets/(liabilities) after potential reductions under master netting arrangements $ 32 $ 160
Trade receivables | Credit concentration risk    
Financial Instruments [Line Items]    
Number of customers that individually represented 10% or more of total trade receivables | Customer 2 1
Trade receivables | Credit concentration risk | Customer one    
Financial Instruments [Line Items]    
Concentration risk, percentage 10.00% 10.00%
Trade receivables | Credit concentration risk | Customer two    
Financial Instruments [Line Items]    
Concentration risk, percentage 10.00%  
Trade receivables | Credit concentration risk | Cellular network carriers    
Financial Instruments [Line Items]    
Concentration risk, percentage 59.00% 63.00%
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 2
Non-trade receivables | Credit concentration risk | Vendor one    
Financial Instruments [Line Items]    
Concentration risk, percentage 42.00% 47.00%
Non-trade receivables | Credit concentration risk | Vendor two    
Financial Instruments [Line Items]    
Concentration risk, percentage 19.00% 21.00%
Non-trade receivables | Credit concentration risk | Vendor three    
Financial Instruments [Line Items]    
Concentration risk, percentage 10.00%  
Accrued expenses    
Financial Instruments [Line Items]    
Net cash collateral received, derivative instruments $ 35 $ 163
Derivatives not designated as accounting hedges | Net sales    
Financial Instruments [Line Items]    
Non-designated derivatives, fair value adjustment gains/(losses) 20  
Derivatives not designated as accounting hedges | Cost of sales    
Financial Instruments [Line Items]    
Non-designated derivatives, fair value adjustment gains/(losses) (40)  
Derivatives not designated as accounting hedges | Other income/(expense), net    
Financial Instruments [Line Items]    
Non-designated derivatives, fair value adjustment gains/(losses) $ 606  
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    
Financial Instruments [Line Items]    
Hedged foreign currency transactions, expected recognition period 25 years