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Stockholders' Equity - PRSU's (Details) - Non-Executive Employees - Performance Based Restricted Stock Unit PRSU - USD ($)
shares in Millions, $ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Jul. 31, 2021
Jul. 31, 2021
Jan. 31, 2021
Vesting March 15 2021      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Units granted (in shares)     0.6
Share-based compensation expense   $ 17  
Vesting March 15 2022      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Units granted (in shares) 0.3    
Share-based compensation expense $ 11 11  
Unrecognized compensation cost, other than options $ 56 $ 56  
Unrecognized compensation cost recognized over weighted-average period   7 months