Postretirement Benefits (Narrative) (Details) $ in Millions	12 Months Ended
	Jan. 28, 2017 USD ($) officer beneficiary participant retiree	Jan. 30, 2016 USD ($)
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Number of total participants in SERP benefits plan | participant	57
Number of officers and select employees eligible for SERP benefits | officer	20
Number of retirees eligible for SERP benefits | retiree	36
Number of beneficiaries eligible for SERP benefits | beneficiary	1
Accumulated benefit obligation	$ 184	$ 177
Scenario, Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Cost currently in accumulated other comprehensive loss expected to be recognized as components of SERP expense in the next year	$ 3