| Document and Entity Information | Jul. 20, 2020 |
| Document And Entity Information [Line Items] | |
| Entity Registrant Name | DXC Technology Co |
| Amendment Flag | false |
| Entity Central Index Key | 0001688568 |
| Document Type | 8-K |
| Document Period End Date | Jul. 20, 2020 |
| Entity Incorporation State Country Code | NV |
| Entity File Number | 001-38033 |
| Entity Tax Identification Number | 61-1800317 |
| Entity Address, Address Line One | 1775 Tysons Boulevard |
| Entity Address, City or Town | Tysons |
| Entity Address, State or Province | VA |
| Entity Address, Postal Zip Code | 22102 |
| City Area Code | (703) |
| Local Phone Number | 245-9675 |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
| Common Stock [Member] | |
| Document And Entity Information [Line Items] | |
| Security 12b Title | Common Stock, $0.01 par value per share |
| Trading Symbol | DXC |
| Security Exchange Name | NYSE |
| M 2.750 Senior Notes Due 20252 [Member] | |
| Document And Entity Information [Line Items] | |
| Security 12b Title | 2.750% Senior Notes Due 2025 |
| Trading Symbol | DXC 25 |
| Security Exchange Name | NYSE |
| M 1.750 Senior Notes Due 20261 [Member] | |
| Document And Entity Information [Line Items] | |
| Security 12b Title | 1.750% Senior Notes Due 2026 |
| Trading Symbol | DXC 26 |
| Security Exchange Name | NYSE |
