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Financial Instruments - Additional Information (Details)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 30, 2017
USD ($)
Vendor
Customer
Dec. 31, 2016
USD ($)
Sep. 30, 2017
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 $ 1,300   $ 1,400
Potential reduction to derivative liabilities resulting from rights of set-off under master netting arrangements 1,300   1,400
Net derivative assets/(liabilities) after potential reductions under master netting arrangements $ (66)   $ 32
Trade receivables | Credit concentration risk      
Financial Instruments [Line Items]      
Number of customers that individually represented 10% or more of total trade receivables | Customer 1   2
Trade receivables | Credit concentration risk | Customer one      
Financial Instruments [Line Items]      
Concentration risk, percentage 11.00%   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 57.00%   59.00%
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 1   3
Non-trade receivables | Credit concentration risk | Vendor one      
Financial Instruments [Line Items]      
Concentration risk, percentage 66.00%   42.00%
Non-trade receivables | Credit concentration risk | Vendor two      
Financial Instruments [Line Items]      
Concentration risk, percentage     19.00%
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 $ 230   $ 35
Derivatives not designated as accounting hedges | Net sales      
Financial Instruments [Line Items]      
Non-designated derivatives, fair value adjustment gains/(losses)   $ 273  
Derivatives not designated as accounting hedges | Cost of sales      
Financial Instruments [Line Items]      
Non-designated derivatives, fair value adjustment gains/(losses)   332  
Derivatives not designated as accounting hedges | Other income/(expense), net      
Financial Instruments [Line Items]      
Non-designated derivatives, fair value adjustment gains/(losses)   $ 508  
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