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Deferred Costs	6 Months Ended
	Jul. 31, 2019
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Deferred Costs	Deferred Costs Deferred costs, which consist of deferred sales commissions, were $268 million and $264 million as of July 31, 2019, and January 31, 2019, respectively. Amortization expense for the deferred costs was $22 million and $17 million for the three months ended July 31, 2019, and 2018, respectively, and $43 million and $33 million for the six months ended July 31, 2019, and 2018, respectively. There was no impairment loss in relation to the costs capitalized for the periods presented.

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Sum of the carrying amounts of deferred costs that are expected to be recognized as a charge against earnings including current and noncurrent term.

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