Description of Business and Summary of Significant Accounting Policies (Narrative) (Details) $ in Millions	12 Months Ended
	Jan. 28, 2017 USD ($)	Jan. 30, 2016 USD ($)	Jan. 31, 2015 USD ($)
Marketable Securities, Equity Securities, Current		$ 10
Deferred Rent Credit, Noncurrent	$ 191	150
Maturity of short term investments, maximum, in days	90
Outstanding Check Carrying Amount	$ 5	30
Catalogue and advertising expense	325	414	$ 436
Unamortized portion of landlord allowances	$ 279	$ 212