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Benefit Plans - Additional Information (Details)
shares in Millions
12 Months Ended
Sep. 25, 2021
USD ($)
shares
Sep. 26, 2020
USD ($)
shares
Sep. 28, 2019
USD ($)
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Maximum portion of pre-tax earnings that can be deferred by participating U.S. employees under 401(k) Plan $ 19,500    
Payments to taxing authorities for employees' tax obligations 6,556,000,000 $ 3,634,000,000 $ 2,817,000,000
Total unrecognized compensation cost related to RSUs and stock options $ 13,600,000,000    
Total unrecognized compensation cost related to RSUs and stock options, weighted-average recognition period 2 years 6 months    
Minimum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Employer matching contribution to 401(k) Plan as a percentage of employee's contribution 50.00%    
Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Employer matching contribution to 401(k) Plan as a percentage of employee's contribution 100.00%    
Employer matching contribution to 401(k) Plan as a percentage of employee's eligible earnings 6.00%    
Restricted stock units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Fair value of RSUs as of the respective vesting dates $ 19,000,000,000 $ 10,800,000,000 $ 8,600,000,000
The total shares withheld upon vesting of RSUs (in shares) | shares 53 56 59
Payments to taxing authorities for employees' tax obligations $ 6,800,000,000 $ 3,900,000,000 $ 3,000,000,000
Employee Stock Purchase Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares reserved for future issuance under stock plans (in shares) | shares 96    
Employee common stock purchases through payroll deductions, price as a percentage of fair market value 85.00%    
Employee Stock Purchase Plan, offering period 6 months    
Payroll deductions as a percentage of employee compensation, maximum 10.00%    
Employee Stock Purchase Plan, maximum annual purchase amount per employee $ 25,000    
2014 Employee Stock Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares reserved for future issuance under stock plans (in shares) | shares 760    
2014 Employee Stock Plan | Restricted stock units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based award, vesting period 4 years    
Number of shares of common stock issued per RSU upon vesting 1    
Factor by which each RSU granted reduces, and each RSU canceled or share withheld for taxes increases, the number of shares available for grant 2    
Non-Employee Director Stock Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares reserved for future issuance under stock plans (in shares) | shares 4    
Non-Employee Director Stock Plan | Restricted stock units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Factor by which each RSU granted reduces, and each RSU canceled or share withheld for taxes increases, the number of shares available for grant 2