Basis of Presentation (COVID-19 Related Asset Impairment Charges) (Details) - USD ($) $ in Millions		3 Months Ended	9 Months Ended
		Oct. 31, 2020	Oct. 31, 2020	Nov. 02, 2019
Property, Plant and Equipment [Line Items]
Long-lived asset impairment	[1]	$ 0	$ 96
Operating lease ROU asset impairment	[1]	0	41
Total asset impairment		0	137	$ 0
Applicable long-lived assets [Member]
Property, Plant and Equipment [Line Items]
Carrying value of applicable assets after impairment		13	13
Applicable operating lease ROU assets [Member]
Property, Plant and Equipment [Line Items]
Carrying value of applicable assets after impairment		$ 3	$ 3

[1] As of October 31, 2020, the carrying value of the applicable long-lived and operating lease ROU assets after impairment was $13 and $3.