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. 03, 2015	Sep. 27, 2014	Sep. 28, 2013
Earnings Per Share [Abstract]
Weighted average number of common and common equivalent shares outstanding (basic)	1,694	1,740	1,792
Weighted average dilutive impact of Awards	15	19	21
Weighted average number of common and common equivalent shares outstanding (diluted)	1,709	1,759	1,813
Awards excluded from diluted earnings per share	3	6	2