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Deferred Costs	3 Months Ended
Deferred Costs	Apr. 30, 2020
Deferred Costs [Abstract]
Deferred Costs	Deferred Costs Deferred costs, which consist primarily of deferred sales commissions, were $34 million and $36 million as of April 30, 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 for both the three months ended April 30, 2020 and 2019. There have been no impairment losses recorded in relation to the costs capitalized for any period presented.