Exit Activities - Narrative (Details) - Canada Restructuring $ in Millions	3 Months Ended		9 Months Ended
	Jan. 31, 2020 store	Nov. 01, 2019 USD ($)	Nov. 01, 2019 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Costs Incurred		$ 53	$ 53
Number of stores to be closed | store	34
Long-lived asset impairments
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Costs Incurred		$ 53	$ 53