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Deferred Costs
3 Months Ended
Apr. 30, 2019
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]  
Deferred Costs
Deferred Costs
Deferred costs, which consist of deferred sales commissions, were $262 million and $264 million as of April 30, 2019 and January 31, 2019, respectively. Amortization expense for the deferred costs was $21 million and $16 million for the three months ended April 30, 2019 and 2018, respectively. There was no impairment loss in relation to the costs capitalized for the periods presented.