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Stock Incentive Plans - Schedule of Share Based Compensation Shares Authorized (Details) - $ / shares
Dec. 31, 2021
Mar. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Common stock, par value (in dollars per share) $ 0.01 $ 0.01
Reserved for Issuance (in shares) 52,195,000  
Available for Future Grants (in shares) 31,601,965  
DXC Employee Equity Plan    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Reserved for Issuance (in shares) 51,200,000  
Available for Future Grants (in shares) 31,106,625  
DXC Director Equity Plan    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Reserved for Issuance (in shares) 745,000  
Available for Future Grants (in shares) 361,651  
DXC Share Purchase Plan    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Reserved for Issuance (in shares) 250,000  
Available for Future Grants (in shares) 133,689