Deferred Costs	9 Months Ended
Oct. 31, 2018
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Deferred Costs	Deferred Costs Deferred costs, which primarily consist of deferred sales commissions, were $222 million and $204 million as of October 31, 2018 and January 31, 2018, respectively. Amortization expense for the deferred costs was $18 million and $14 million for the three months ended October 31, 2018 and 2017, respectively, and $52 million and $42 million for the nine months ended October 31, 2018 and 2017, respectively. There was no impairment loss in relation to the costs capitalized for the periods presented.

Deferred Costs

9 Months Ended

Oct. 31, 2018

Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]

Deferred costs, which primarily consist of deferred sales commissions, were $222 million and $204 million as of October 31, 2018 and January 31, 2018, respectively. Amortization expense for the deferred costs was $18 million and $14 million for the three months ended October 31, 2018 and 2017, respectively, and $52 million and $42 million for the nine months ended October 31, 2018 and 2017, respectively. There was no impairment loss in relation to the costs capitalized for the periods presented.