Benefit Plans - Additional Information (Details) $ in Millions	3 Months Ended		6 Months Ended
	Apr. 01, 2017 USD ($) shares	Mar. 26, 2016 USD ($)	Apr. 01, 2017 USD ($) shares	Mar. 26, 2016 USD ($)
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Shares reserved for future issuance under stock plans (in shares) | shares	317,400,000		317,400,000
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Income tax benefit related to share-based compensation expense	$ 424	$ 347	$ 889	$ 760
Total unrecognized compensation cost on RSUs, restricted stock and stock options	10,000		$ 10,000
Total unrecognized compensation cost on RSUs, restricted stock and stock options, weighted-average recognition period (in years)			2 years 9 months
Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
RSUs granted 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) | 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	$ 460	$ 450	$ 2,600	$ 2,500