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Benefit Plans - Additional Information (Detail) - USD ($)
12 Months Ended
Sep. 26, 2015
Sep. 27, 2014
Sep. 28, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Maximum portion of pre-tax earnings under Savings Plan that can be deferred by participating U.S. employees $ 18,000    
Employer contribution to Savings Plan 200,000,000 $ 163,000,000 $ 135,000,000
Fair value of vested RSUs as of vesting date $ 4,800,000,000 $ 3,400,000,000 $ 3,100,000,000
The total shares withheld upon vesting of RSUs 14,100,000 15,600,000 15,500,000
Taxes paid related to net share settlement of equity awards $ 1,600,000,000 $ 1,200,000,000 $ 1,100,000,000
Stock options outstanding 1,200,000    
Stock options, Weighted average exercise price per share $ 15.08    
Stock options, Weighted average remaining contractual term 4 years 1 month 6 days    
Stock options, Aggregate intrinsic value $ 120,000,000    
Total intrinsic value of options at the time of exercise 479,000,000 1,500,000,000 1,000,000,000
Income tax benefit related to share-based compensation expense 1,200,000,000 $ 1,000,000,000 $ 816,000,000
Total unrecognized compensation cost on stock options and RSUs $ 6,800,000,000    
Total unrecognized compensation cost on stock options and RSUs, weighted-average recognition period (in years) 2 years 8 months 12 days    
Employee Stock Purchase Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares reserved for future issuance under Employee Benefit Plans (in shares) 53,000,000    
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%    
Minimum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Rate of contribution to Savings Plan as a percentage of employees contribution 50.00%    
Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Rate of contribution to Savings Plan as a percentage of employees contribution 100.00%    
Rate of contribution to Savings Plan as a percentage of employees earning 6.00%    
Maximum | Employee Stock Purchase Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Employee stock purchase program authorized amount $ 25,000    
Employee Stock Plan, 2014 Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
RSUs granted vesting period 4 years    
Shares authorized for future issuance under stock plans (in shares) 385,000,000    
Shares reserved for future issuance under Employee Benefit Plans (in shares) 442,900,000    
Employee Stock Plan, 2003 Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Options granted exercisable period 4 years    
Employee Stock Plan, 2003 Plan | Minimum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
RSUs granted vesting period 2 years    
Expiration term of options granted under Employee Benefit Plans 7 years    
Employee Stock Plan, 2003 Plan | Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
RSUs granted vesting period 4 years    
Expiration term of options granted under Employee Benefit Plans 10 years    
Directors Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares reserved for future issuance under Employee Benefit Plans (in shares) 1,200,000    
Share based compensation, expiration date Nov. 09, 2019