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Financial Instruments - Additional Information (Details)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 26, 2020
USD ($)
Customer
Vendor
Dec. 28, 2019
USD ($)
Sep. 26, 2020
USD ($)
Vendor
Customer
Financial Instruments [Line Items]      
Non-marketable equity securities, carrying value $ 2,500   $ 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) $ 82 $ 128  
Amounts excluded from the effectiveness assessment of the Company’s hedges and recognized in OCI, gains/(losses) (138) $ (89)  
Net cash collateral posted, derivative instruments 215    
Net cash collateral received, derivative instruments     875
Potential reduction to derivative assets resulting from rights of set-off under master netting arrangements 3,500   2,800
Potential reduction to derivative liabilities resulting from rights of set-off under master netting arrangements 3,500   2,800
Net derivative assets/(liabilities) after potential reductions under master netting arrangements $ (684)   $ (312)
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
Trade receivables | Credit concentration risk | Cellular network carriers      
Financial Instruments [Line Items]      
Concentration risk, percentage 41.00%    
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 61.00%   57.00%
Non-trade receivables | Credit concentration risk | Vendor two      
Financial Instruments [Line Items]      
Concentration risk, percentage 14.00%   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 22 years    
Minimum      
Financial Instruments [Line Items]      
General maturities of non-current marketable securities 1 year    
Maximum      
Financial Instruments [Line Items]      
General maturities of non-current marketable securities 5 years