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Business Combinations - Schedule of Consideration Transferred (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jul. 21, 2021
Oct. 31, 2021
Oct. 31, 2020
Oct. 31, 2021
Oct. 31, 2020
Business Acquisition [Line Items]          
Fair value of stock options, restricted stock units and restricted stock awards assumed   $ 0 $ 0 $ 205 $ 6
Slack          
Business Acquisition [Line Items]          
Cash $ 15,799        
Common stock issued 11,064        
Fair value of stock options, restricted stock units and restricted stock awards assumed 205        
Total $ 27,068