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Financial Instruments - Additional Information (Details)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 29, 2018
USD ($)
Customer
Vendor
Sep. 29, 2018
USD ($)
Customer
Vendor
Financial Instruments [Line Items]    
Non-marketable equity securities, carrying value $ 2,200  
Non-marketable debt security, amortized cost basis and carrying value $ 1,500  
Hedged interest rate transactions, expected recognition period 9 years  
Potential reduction to derivative assets resulting from rights of set-off under master netting arrangements $ 1,900 $ 2,100
Potential reduction to derivative liabilities resulting from rights of set-off under master netting arrangements 1,900 2,100
Net derivative assets/(liabilities) after potential reductions under master netting arrangements $ (260) $ 138
Trade receivables | Credit concentration risk    
Financial Instruments [Line Items]    
Number of customers that individually represented 10% or more of total trade receivables | Customer 0 1
Trade receivables | Credit concentration risk | Customer one    
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 2 2
Non-trade receivables | Credit concentration risk | Vendor one    
Financial Instruments [Line Items]    
Concentration risk, percentage 56.00% 62.00%
Non-trade receivables | Credit concentration risk | Vendor two    
Financial Instruments [Line Items]    
Concentration risk, percentage 15.00% 12.00%
Other current assets    
Financial Instruments [Line Items]    
Net cash collateral posted, derivative instruments $ 56 $ 1,000
Derivatives not designated as accounting hedges | Net sales    
Financial Instruments [Line Items]    
Non-designated derivatives, fair value adjustment gains/(losses) 255  
Derivatives not designated as accounting hedges | Total cost of sales    
Financial Instruments [Line Items]    
Non-designated derivatives, fair value adjustment gains/(losses) 175  
Derivatives not designated as accounting hedges | Other income/(expense), net    
Financial Instruments [Line Items]    
Non-designated derivatives, fair value adjustment gains/(losses) $ 723  
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 24 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