Basis of Presentation Narrative (Details) $ in Millions	6 Months Ended
	Jul. 29, 2017 USD ($)	Jul. 30, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Reporting period lag for consolidation of financial results	1 month
Number of Weeks in Fiscal Period	26	26
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
ASU adoption cumulative adjustment	$ (2)
Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
ASU adoption cumulative adjustment	$ (12)