Equity - Additional Information (Detail) - USD ($) shares in Millions, $ in Millions	Oct. 03, 2015	Jan. 30, 2015	Sep. 27, 2014
Equity [Abstract]
Total shares authorized for repurchase		400
Remaining shares authorized for repurchase	355
Available-for-sale securities, unrecognized gain positions	$ 21		$ 55

Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563

Name:	us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant