Earnings Per Share Earnings Per Share (Narrative) (Details) - shares shares in Millions	6 Months Ended
Jul. 29, 2017	Jul. 30, 2016
Stock Options [Member]
Stock options and restricted stock units outstanding, not included in computation of diluted earnings per share	16.7	15.7
Restricted Stock Units [Member]
Stock options and restricted stock units outstanding, not included in computation of diluted earnings per share	1.1	1.1

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.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

Name:	us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration