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Financial Instruments - Additional Information (Details)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Jun. 29, 2019
USD ($)
Vendor
Customer
Jun. 30, 2018
USD ($)
Jun. 29, 2019
USD ($)
Vendor
Customer
Jun. 30, 2018
USD ($)
Sep. 29, 2018
USD ($)
Vendor
Customer
Financial Instruments [Line Items]          
Non-marketable equity securities, carrying value $ 2,400   $ 2,400    
Hedged interest rate transactions, expected recognition period     8 years    
Fair value hedges, gains/(losses) excluded from effectiveness testing 171   $ 645    
Potential reduction to derivative assets resulting from rights of set-off under master netting arrangements 1,800   1,800   $ 2,100
Potential reduction to derivative liabilities resulting from rights of set-off under master netting arrangements 1,800   1,800   2,100
Net derivative assets/(liabilities) after potential reductions under master netting arrangements $ (14)   $ (14)   $ 138
Trade receivables | Credit concentration risk          
Financial Instruments [Line Items]          
Number of customers that individually represented 10% or more of total trade receivables | Customer 1   1   1
Trade receivables | Credit concentration risk | Customer one          
Financial Instruments [Line Items]          
Concentration risk, percentage     11.00%   10.00%
Trade receivables | Credit concentration risk | Cellular network carriers          
Financial Instruments [Line Items]          
Concentration risk, percentage     42.00%   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   2
Non-trade receivables | Credit concentration risk | Vendor one          
Financial Instruments [Line Items]          
Concentration risk, percentage     57.00%   62.00%
Non-trade receivables | Credit concentration risk | Vendor two          
Financial Instruments [Line Items]          
Concentration risk, percentage     12.00%   12.00%
Non-trade receivables | Credit concentration risk | Vendor three          
Financial Instruments [Line Items]          
Concentration risk, percentage     12.00%    
Other current assets          
Financial Instruments [Line Items]          
Net cash collateral posted, derivative instruments         $ 1,000
Other current liabilities          
Financial Instruments [Line Items]          
Net cash collateral received, derivative instruments $ 603   $ 603    
Net sales          
Financial Instruments [Line Items]          
Non-designated derivatives, fair value adjustment gains/(losses) 58 $ 135 283 $ (7)  
Cost of sales          
Financial Instruments [Line Items]          
Non-designated derivatives, fair value adjustment gains/(losses) 40 151 108 (61)  
Other income/(expense), net          
Financial Instruments [Line Items]          
Non-designated derivatives, fair value adjustment gains/(losses) $ (34) $ 132 $ (58) $ (241)  
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 and marketable securities          
Financial Instruments [Line Items]          
Hedged foreign currency transactions, expected recognition period     23 years    
Minimum          
Financial Instruments [Line Items]          
General maturities of long-term marketable securities     1 year    
Maximum          
Financial Instruments [Line Items]          
General maturities of long-term marketable securities     5 years