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Equity-Based Compensation - Additional Information (Detail) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
12 Months Ended
Sep. 29, 2018
Sep. 30, 2017
Oct. 01, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term 10 years    
Restricted stock units granted, number of shares [1] 5.0    
Restricted stock units granted, unvested number of shares 9.0 [2] 9.0  
Weighted average grant-date fair values of options granted $ 28.01 $ 25.65 $ 30.93
Stock options exercised and RSUs vested, total intrinsic value $ 585 $ 757 $ 981
Aggregate intrinsic values of stock options vested 684    
Cash received from option exercises 210 276 259
Tax benefits realized from tax deductions associated with option exercises and RSU activity 159 $ 264 $ 342
Expected to Vest      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Aggregate intrinsic values of stock options vested $ 78    
Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Maximum extension period of stock options after grant date 15 years    
Stock Options      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Ratable vesting term of stock options from grant date 4 years    
Number of shares authorized to be awarded as grants 55.0    
Unrecognized compensation costs $ 122    
Weighted-average period to recognize compensation costs 1 year 7 months    
Restricted Stock Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Ratable vesting term of stock options from grant date 4 years    
Number of shares authorized to be awarded as grants 28.0    
Unrecognized compensation costs $ 455    
Weighted-average period to recognize compensation costs 1 year 8 months    
Performance Based Restricted Stock      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Ratable vesting term of stock options from grant date 3 years    
Restricted stock units granted, number of shares 1.1    
Restricted stock units granted, unvested number of shares 1.4    
[1] Includes 1.1 million Performance RSUs.
[2] Includes 1.4 million Performance RSUs.