Benefit Plans (Narrative) (Details) $ in Millions	3 Months Ended	6 Months Ended
Jul. 31, 2021 USD ($)	Aug. 01, 2020 USD ($)	Jul. 31, 2021 USD ($) Hour	Aug. 01, 2020 USD ($)
Pension And Other Postretirement Benefit Expense [Abstract]
Number of hours required for participation in defined benefit and defined contribution plans \| Hour			1,000
Defined benefit plan, amount of transferred pension plan assets	$ 256		$ 256
Defined benefit plan, settlement charges	$ 81	$ 38	$ 81	$ 38

Amount of gain (loss) recognized in net periodic benefit (cost) credit from irrevocable action relieving primary responsibility for benefit obligation and eliminating risk related to obligation and assets used to effect settlement.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (h)(7)
-URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 45
-Paragraph 3A
-URI http://asc.fasb.org/extlink&oid=109237824&loc=SL108413299-114919

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 6
-Subparagraph (a)(7)
-URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration