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Financial Instruments - Additional Information (Details)
$ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Mar. 27, 2021
USD ($)
Customer
Vendor
Mar. 28, 2020
USD ($)
Mar. 27, 2021
USD ($)
Customer
Vendor
Mar. 28, 2020
USD ($)
Sep. 26, 2020
USD ($)
Customer
Vendor
Financial Instruments [Line Items]          
Non-marketable equity securities, carrying value $ 2,700   $ 2,700   $ 2,800
Hedged interest rate transactions, expected recognition period     7 years    
Amounts excluded from the effectiveness assessment of fair value hedges and recognized in OI&E, gains/(losses) 60 $ 126 $ 142 $ 254  
Amounts excluded from the effectiveness assessment of the Company’s hedges and recognized in OCI, gains/(losses) 41 $ 258 (97) $ 169  
Net cash collateral received, derivative instruments 935   935   875
Potential reduction to derivative assets resulting from rights of set-off under master netting arrangements 2,400   2,400   2,800
Potential reduction to derivative liabilities resulting from rights of set-off under master netting arrangements 2,400   2,400   2,800
Net derivative assets/(liabilities) after potential reductions under master netting arrangements $ (233)   $ (233)   $ (312)
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   0
Trade receivables | Credit concentration risk | Customer one          
Financial Instruments [Line Items]          
Concentration risk, percentage     13.00%    
Trade receivables | Credit concentration risk | Cellular network carriers          
Financial Instruments [Line Items]          
Concentration risk, percentage     35.00%    
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   1   2
Non-trade receivables | Credit concentration risk | Vendor one          
Financial Instruments [Line Items]          
Concentration risk, percentage     65.00%   57.00%
Non-trade receivables | Credit concentration risk | Vendor two          
Financial Instruments [Line Items]          
Concentration risk, percentage         11.00%
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     21 years