Leases (Lease Cost) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jul. 31, 2020	Aug. 02, 2019	Jul. 31, 2020	Aug. 02, 2019
Leases [Abstract]
Operating lease expense	$ 44	$ 41	$ 90	$ 80
Finance lease expense:
Amortization of ROU assets	1	1	3	1
Interest on lease liabilities	1	0	1	0
Total finance lease expense	2	1	4	1
Short-term lease expense	0	0	1	1
Variable lease expense	7	8	15	16
Total lease expense	$ 53	$ 50	$ 110	$ 98