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Revenue, Unearned Revenue and Remaining Performance Obligations (Tables)
 6 Months Ended
Jul. 31, 2020
Revenue from Contract with Customer [Abstract]  
Summary of Unearned Revenue
Unearned revenue as of the periods presented consisted of the following (table in millions):
 
July 31,
 
January 31,
 
2020
 
2020
Unearned license revenue
$
11

 
$
19

Unearned subscription and SaaS revenue
1,619

 
1,534

Unearned software maintenance revenue
6,696

 
6,700

Unearned professional services revenue
1,059

 
1,015

Total unearned revenue
$
9,385

 
$
9,268