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Financial Instruments - Additional Information (Details)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Jun. 30, 2018
USD ($)
Vendor
Customer
Jul. 01, 2017
USD ($)
Jun. 30, 2018
USD ($)
Vendor
Customer
Jul. 01, 2017
USD ($)
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     9 years    
Potential reduction to derivative assets resulting from rights of set-off under master netting arrangements $ 1,500   $ 1,500   $ 1,400
Potential reduction to derivative liabilities resulting from rights of set-off under master netting arrangements 1,500   1,500   1,400
Net derivative assets/(liabilities) after potential reductions under master netting arrangements $ (403)   $ (403)   $ 32
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   2
Trade receivables | Credit concentration risk | Customer one          
Financial Instruments [Line Items]          
Concentration risk, percentage         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     45.00%   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 3   3   3
Non-trade receivables | Credit concentration risk | Vendor one          
Financial Instruments [Line Items]          
Concentration risk, percentage     54.00%   42.00%
Non-trade receivables | Credit concentration risk | Vendor two          
Financial Instruments [Line Items]          
Concentration risk, percentage     12.00%   19.00%
Non-trade receivables | Credit concentration risk | Vendor three          
Financial Instruments [Line Items]          
Concentration risk, percentage     11.00%   10.00%
Other current assets          
Financial Instruments [Line Items]          
Net cash collateral posted, derivative instruments $ 211   $ 211    
Accrued expenses          
Financial Instruments [Line Items]          
Net cash collateral received, derivative instruments         $ 35
Derivatives not designated as accounting hedges | Net sales          
Financial Instruments [Line Items]          
Non-designated derivatives, fair value adjustment gains/(losses) 135 $ (77) (7) $ 129  
Derivatives not designated as accounting hedges | Cost of sales          
Financial Instruments [Line Items]          
Non-designated derivatives, fair value adjustment gains/(losses) 151 12 (61) 91  
Derivatives not designated as accounting hedges | Other income/(expense), net          
Financial Instruments [Line Items]          
Non-designated derivatives, fair value adjustment gains/(losses) $ 254 $ 49 $ (119) $ 481  
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     24 years