Leases, Codification Topic 842 (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
	May 15, 2020	Oct. 31, 2020	Aug. 01, 2020	Oct. 31, 2020
Leases [Abstract]
Operating lease, weighted average discount rate, percent			22.30%
Increase (decrease) in operating assets	$ 95		$ 46
Increase (decrease) in operating liabilities	115	$ 80	112
Gain (loss) on remeasurement of operating lease assets, net	$ 20
Operating lease, right-of-use asset, amortization expense		2	11
(Gain)/loss on lease terminations, net of landlord damage claims		(11)	$ (66)	$ 55
Landlord Damage Claims		$ 91