Equity-Based Compensation - Impact of Stock Options/Rights and Restricted Stock Units on Income and Cash Flows (Detail) - USD ($) $ in Millions		12 Months Ended
		Sep. 30, 2017	Oct. 01, 2016	Oct. 03, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock option/rights compensation expense		$ 90	$ 93	$ 102
RSU compensation expense		274	293	309
Total equity-based compensation expense	[1]	364	386	411
Tax impact		(123)	(131)	(134)
Reduction in net income		241	255	277
Equity-based compensation expense capitalized during the period		$ 78	78	57
Tax benefit reported in cash flow from financing activities	[2]		$ 208	$ 313

[1] Equity-based compensation expense is net of capitalized equity-based compensation and estimated forfeitures and excludes amortization of previously capitalized equity-based compensation costs.

[2] The amount for fiscal 2017 is not applicable as the Company adopted new accounting guidance in fiscal 2017 (see Note 18).