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Stock Incentive Plans - Narrative (Details) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Sep. 30, 2021 USD ($) shares | Sep. 30, 2021 USD ($) 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 | $ | $ 216 | $ 216
Weighted average period over which cost is expected to be recognized |  | 2 years 2 months 1 day
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) | 6,663 | 14,182

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