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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 9 Months Ended 12 Months Ended
Oct. 31, 2021
Oct. 31, 2021
Jan. 31, 2021
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 $ 24 $ 35  
Unrecognized compensation cost, other than options $ 37 $ 37  
Unrecognized compensation cost recognized over weighted-average period   5 months  
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