Summary of Significant Accounting Policies - Reconciliation of Weighted Average Number of Common and Common Equivalent Shares Outstanding and Number of Awards Excluded from Diluted Earnings Per Share (Detail) - shares shares in Millions	12 Months Ended
	Oct. 01, 2016	Oct. 03, 2015	Sep. 27, 2014
Earnings Per Share [Abstract]
Weighted average number of common and common equivalent shares outstanding (basic)	1,629	1,694	1,740
Weighted average dilutive impact of Awards	10	15	19
Weighted average number of common and common equivalent shares outstanding (diluted)	1,639	1,709	1,759
Awards excluded from diluted earnings per share	6	3	6