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Stock Incentive Plans - Narrative (Details)
$ in Millions
3 Months Ended 9 Months Ended
Dec. 31, 2021
USD ($)
shares
Dec. 31, 2021
USD ($)
anniversary
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Plan term   10 years
Restricted Stock Units    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of shares to be received (in shares) 1 1
Total unrecognized compensation expense related to unvested awards, net of expected forfeitures | $ $ 182 $ 182
Weighted average period over which cost is expected to be recognized   1 year 11 months 23 days
Restricted Stock Units | Five Years    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Annual installments   5 years
Restricted Stock Units | Ten Years    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Annual installments   10 years
Restricted Stock Units | Fifteen Years    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Annual installments   15 years
Restricted Stock Units | Service-Based RSU's    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of anniversaries over which shares are settled | anniversary   10
Performance Stock Units    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Vesting period   3 years
Award vesting rights, percentage   25.00%
Performance period   3 years
Stock Options | DXC Share Purchase Plan    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Shares purchased under plan (in shares) 7,437 21,619