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Fair Value Measurements (Fair Value, Lease Guarantees On Recurring Basis, Unobservable Input) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Oct. 31, 2015
Nov. 01, 2014
Oct. 31, 2015
Nov. 01, 2014
Fair Value Measurements [Abstract]        
Beginning Balance $ 0 $ 1 $ 1 $ 1
Change in Estimated Fair Value Reported in Earnings 0 0 (1) 0
Ending Balance $ 0 $ 1 $ 0 $ 1