Fair Value Measurements and Concentrations of Credit Risk (Company Non-Financial Assets Measured On A Recurring Basis) (Details) (USD $) In Millions, unless otherwise specified	Jan. 31, 2015	Feb. 01, 2014
Long-lived assets held and used	$ 8	$ 13
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Long-lived assets held and used	0	0
Significant Observable Inputs (Level 2) [Member]
Long-lived assets held and used	0	0
Significant Unobservable Inputs (Level 3) [Member]
Long-lived assets held and used	$ 8	$ 13