Deferred Costs	9 Months Ended
	Oct. 31, 2020
Deferred Costs [Abstract]
Deferred Costs	Deferred CostsDeferred costs, which consist primarily of deferred sales commissions, were $35 million and $36 million as of October 31, 2020 and January 31, 2020, respectively. Amortization expense for the deferred costs included in sales and marketing expenses in the condensed consolidated statements of comprehensive income was $5 million and $15 million for the three and nine months ended October 31, 2020, respectively and $5 million and $15 million for the three and nine months ended October 31, 2019, respectively. There have been no impairment losses recorded in relation to the costs capitalized for any period presented.