Benefit Plans - Additional Information (Detail) $ in Millions	3 Months Ended
	Dec. 31, 2016 USD ($) shares	Dec. 26, 2015 USD ($)
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Shares reserved for future issuance under Employee Benefit Plans (in shares) | shares	316,400,000
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Income tax benefit related to share-based compensation expense	$ 465	$ 413
Total unrecognized compensation cost on stock options and RSUs	$ 11,000
Total unrecognized compensation cost on stock options and RSUs, weighted-average recognition period (in years)	2 years 10 months 24 days
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
RSUs granted vesting period	4 years
Number 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 | shares	2
Increase in number of shares available for grant per RSU cancelled or withheld for tax withholding	2
Fair value of vested RSUs as of vesting date	$ 2,200	$ 2,000