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Financial Instruments - Additional Information (Details)
$ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Mar. 31, 2018
USD ($)
Vendor
Customer
Apr. 01, 2017
USD ($)
Mar. 31, 2018
USD ($)
Vendor
Customer
Apr. 01, 2017
USD ($)
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     10 years    
Potential reduction to derivative assets resulting from rights of set-off under master netting arrangements $ 2,100   $ 2,100   $ 1,400
Potential reduction to derivative liabilities resulting from rights of set-off under master netting arrangements 2,100   2,100   1,400
Net derivative assets/(liabilities) after potential reductions under master netting arrangements $ (313)   $ (313)   $ 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     48.00%   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     44.00%   42.00%
Non-trade receivables | Credit concentration risk | Vendor two          
Financial Instruments [Line Items]          
Concentration risk, percentage     20.00%   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 $ 241   $ 241    
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) (203) $ (67) (142) $ 206  
Derivatives not designated as accounting hedges | Cost of sales          
Financial Instruments [Line Items]          
Non-designated derivatives, fair value adjustment gains/(losses) (247) (253) (212) 79  
Derivatives not designated as accounting hedges | Other income/(expense), net          
Financial Instruments [Line Items]          
Non-designated derivatives, fair value adjustment gains/(losses) $ (331) $ (76) $ (373) $ 432  
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