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Unearned Revenue and Performance Obligations	9 Months Ended
	Oct. 31, 2018
Revenue from Contract with Customer [Abstract]
Unearned Revenue and Performance Obligations	Unearned Revenue and Performance Obligations $547 million and $421 million of subscription services revenue was recognized during the three months ended October 31, 2018 and 2017, respectively, that was included in the unearned revenue balances as of July 31, 2018 and 2017, respectively. $1.2 billion and $904 million of subscription services revenue was recognized during the nine months ended October 31, 2018 and 2017, respectively, that was included in the unearned revenue balances as of January 31, 2018 and 2017, respectively. Professional services revenue recognized in the same periods from unearned revenue balances at the beginning of the respective periods was not material. Transaction Price Allocated to the Remaining Performance Obligations As of October 31, 2018, approximately $5.9 billion of revenue is expected to be recognized from remaining performance obligations for subscription contracts. We expect to recognize revenue on approximately $4.02 billion of these remaining performance obligations over the next 24 months, with the balance recognized thereafter. Revenue from remaining performance obligations for professional services contracts as of October 31, 2018 was not material.

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- Definition

The entire disclosure of revenue from contract with customer to transfer good or service and to transfer nonfinancial asset. Includes, but is not limited to, disaggregation of revenue, credit loss recognized from contract with customer, judgment and change in judgment related to contract with customer, and asset recognized from cost incurred to obtain or fulfill contract with customer. Excludes insurance and lease contracts.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-URI http://asc.fasb.org/topic&trid=49130388

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-URI http://asc.fasb.org/topic&trid=2122369

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