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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) In Millions, unless otherwise specified	12 Months Ended
	Sep. 27, 2014	Sep. 28, 2013	Sep. 29, 2012
Earnings Per Share [Abstract]
Weighted average number of common and common equivalent shares outstanding (basic)	1,740	1,792	1,794
Weighted average dilutive impact of Awards	19	21	24
Weighted average number of common and common equivalent shares outstanding (diluted)	1,759	1,813	1,818
Awards excluded from diluted earnings per share	6	2	10

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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