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Financial Instruments - Additional Information (Detail)
$ in Millions
9 Months Ended 12 Months Ended
Jun. 25, 2016
USD ($)
Vendor
Customer
Sep. 26, 2015
USD ($)
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 foreign currency transactions, typical term 12 months  
Hedged interest rate transactions, expected period to be recognized 10 years  
Reduction to derivative assets by rights of set-off associated with derivative contracts $ 1,300 $ 2,200
Reduction to derivative liabilities by rights of set-off associated with derivative contracts 1,300 2,200
Net derivative assets (liabilities) $ 353 $ (78)
Number of customers representing 10% or more of trade receivables | Customer 1 1
Number of vendors representing a significant portion of non-trade receivables | Vendor 3 3
Trade Receivables | Credit Concentration Risk | Customer One    
Financial Instruments [Line Items]    
Concentration risk, percentage 11.00% 12.00%
Trade Receivables | Credit Concentration Risk | Cellular Network Carriers    
Financial Instruments [Line Items]    
Concentration risk, percentage 59.00% 71.00%
Non-Trade Receivables | Credit Concentration Risk | Vendor One    
Financial Instruments [Line Items]    
Concentration risk, percentage 47.00% 38.00%
Non-Trade Receivables | Credit Concentration Risk | Vendor Two    
Financial Instruments [Line Items]    
Concentration risk, percentage 17.00% 18.00%
Non-Trade Receivables | Credit Concentration Risk | Vendor Three    
Financial Instruments [Line Items]    
Concentration risk, percentage 16.00% 14.00%
Other Current Assets    
Financial Instruments [Line Items]    
Net cash collateral posted, fair value $ 175  
Accrued Expenses    
Financial Instruments [Line Items]    
Net cash collateral received, derivative instruments   $ 1,000