Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

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

RESTRUCTURING ACTIVITIES - Fiscal 2017 Plan (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended	12 Months Ended
	Jul. 29, 2018	Jul. 29, 2018	Jan. 28, 2018
Restructuring activities
Restructuring charges	$ 2	$ 9
Sale of business \| Fiscal 2017 Restructuring Plan \| Waterworks
Restructuring activities
Restructuring charges	2	9	$ 6
Expected further restructuring charges	$ 0	$ 0
Sale of business \| Fiscal 2017 Restructuring Plan \| Waterworks \| Minimum
Restructuring activities
Payback period of the employee-related costs via a permanent reduction in personnel costs		1 year
Sale of business \| Fiscal 2017 Restructuring Plan \| Waterworks \| Maximum
Restructuring activities
Payback period of the employee-related costs via a permanent reduction in personnel costs		2 years