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Benefit Plans - Additional Information (Details)
12 Months Ended
Sep. 30, 2017
USD ($)
shares
Sep. 24, 2016
USD ($)
shares
Sep. 26, 2015
USD ($)
shares
Mar. 29, 2014
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Maximum portion of pre-tax earnings under 401(k) Plan that can be deferred by participating U.S. employees | $ $ 18,000      
The total shares withheld upon vesting of RSUs (in shares) 15,400,000 15,900,000 14,100,000  
Taxes paid related to net share settlement of equity awards | $ $ 2,000,000,000 $ 1,700,000,000 $ 1,600,000,000  
Income tax benefit related to share-based compensation expense | $ 1,600,000,000 1,400,000,000 1,200,000,000  
Total unrecognized compensation cost related to RSUs, restricted stock and stock options | $ $ 8,100,000,000      
Total unrecognized compensation cost related to RSUs, restricted stock 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 vested RSUs as of vesting date | $ $ 6,100,000,000 $ 5,100,000,000 $ 4,800,000,000  
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) 41,500,000      
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 program, authorized amount per employee | $ $ 25,000      
2014 Employee Stock Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares authorized for future issuance under stock plans (in shares)       385,000,000
Shares reserved for future issuance under stock plans (in shares) 327,900,000      
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      
Reduction in number of shares available for grant per share issued with respect to RSUs granted (in shares) 2      
Factor by which each RSU canceled or share withheld for taxes increases the number of shares available for grant 2      
2003 Employee Stock Plan | Restricted stock units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares of common stock issued per RSU upon vesting 1      
2003 Employee Stock Plan | Restricted stock units | Minimum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based award, vesting period 2 years      
2003 Employee Stock Plan | Restricted stock units | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based award, vesting period 4 years      
2003 Employee Stock Plan | Employee stock option        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based award, vesting period 4 years      
2003 Employee Stock Plan | Employee stock option | Minimum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Expiration term of options granted under Employee Benefit Plans 7 years      
2003 Employee Stock Plan | Employee stock option | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Expiration term of options granted under Employee Benefit Plans 10 years      
1997 Director Stock Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares reserved for future issuance under stock plans (in shares) 1,100,000      
1997 Director Stock Plan | Restricted stock units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Reduction in number of shares available for grant per share issued with respect to RSUs granted (in shares) 2