Summary of Significant Accounting Policies - Restricted Assets (Details) (USD $) In Millions, unless otherwise specified	Jan. 31, 2015	Feb. 01, 2014
Accounting Policies [Abstract]
Restricted Cash and Investments	$ 292us-gaap_RestrictedCashAndInvestments	$ 310us-gaap_RestrictedCashAndInvestments
Restricted Cash and Investments, Continuing Operations	184
Restricted Cash and Investments, Held-for-Sale	$ 108

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