Postretirement Health Care and Life Insurance Benefits (Weighted Average Assumptions Used To Determine Net Periodic Costs For Postretirement Plans) (Details)	12 Months Ended
Feb. 03, 2018	Jan. 28, 2017	Jan. 30, 2016
Other Postretirement Benefits Plan [Member]
Discount rate	3.17%	3.14%	3.55%

Weighted average rate for present value of future retirement benefits cash flows, used to determine net periodic benefit cost of defined benefit plan.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (k)(1)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920

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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration