Summary of Significant Accounting Policies - Restricted Assets (Details) - USD ($) $ in Millions	Jan. 28, 2017	Jan. 30, 2016
Accounting Policies [Abstract]
Restricted Cash and Investments	$ 193	$ 185

Cash and investments whose use in whole or in part is restricted for the long-term, generally by contractual agreements or regulatory requirements. For use in an unclassified balance sheet.

No definition available.

Name:	us-gaap_RestrictedCashAndInvestments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant