Amount of lease cost recognized by lessee for lease contract.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918686-209980

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 55
-Paragraph 53
-URI http://asc.fasb.org/extlink&oid=121568110&loc=SL77918982-209971

Name:	us-gaap_LeaseCost
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Leases (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
Leases (Narrative) (Details) - USD ($) $ in Millions	Jul. 31, 2020	Aug. 02, 2019	Jul. 31, 2020	Aug. 02, 2019
Lessee, Lease, Description [Line Items]
Lease expense	$ 53	$ 50	$ 110	$ 98
Minimum
Lessee, Lease, Description [Line Items]
Term of lease contract			1 month
Maximum
Lessee, Lease, Description [Line Items]
Term of lease contract			26 years