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Financial Instruments - Additional Information (Detail)
$ in Millions
6 Months Ended 12 Months Ended
Mar. 26, 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  
Net cash collateral posted, derivative instruments $ 3  
Net cash collateral received, derivative instruments   $ 1,000
Reduction to derivative assets by rights of set-off associated with derivative contracts 1,400 2,200
Reduction to derivative liabilities by rights of set-off associated with derivative contracts 1,400 2,200
Net derivative assets (liabilities) $ (119) $ (78)
Number of customers representing a significant portion 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 12.00% 12.00%
Trade Receivables | Credit Concentration Risk | Cellular Network Carriers    
Financial Instruments [Line Items]    
Concentration risk, percentage 55.00% 71.00%
Non-Trade Receivables | Credit Concentration Risk | Vendor One    
Financial Instruments [Line Items]    
Concentration risk, percentage 55.00% 38.00%
Non-Trade Receivables | Credit Concentration Risk | Vendor Two    
Financial Instruments [Line Items]    
Concentration risk, percentage 14.00% 18.00%
Non-Trade Receivables | Credit Concentration Risk | Vendor Three    
Financial Instruments [Line Items]    
Concentration risk, percentage 11.00% 14.00%