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Cover Page - USD ($)
 12 Months Ended
Mar. 31, 2020
May 26, 2020
Sep. 30, 2019
Entity Information [Line Items]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Mar. 31, 2020    
Document Transition Report false    
Entity File Number 1-4850    
Entity Registrant Name DXC TECHNOLOGY CORPORATION    
Entity Incorporation, State or Country Code NV    
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    
Entity Well-Known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
Entity Shell Company false    
Entity Public Float     $ 7,501,594,766
Entity Common Stock, Shares Outstanding   253,751,753  
Documents Incorporated by Reference

Portions of the registrant's definitive Proxy Statement relating to its 2020 Annual Meeting of Stockholders (the "2020 Proxy Statement"), which will be filed with the Securities and Exchange Commission pursuant to Regulation 14A within 120 days after the registrant's fiscal year end of March 31, 2020, are incorporated by reference into Part III of this Annual Report on Form 10-K where indicated.

    
Entity Central Index Key 0001688568    
Current Fiscal Year End Date --03-31    
Document Fiscal Year Focus 2020    
Document Fiscal Period Focus FY    
Amendment Flag false    
Common Stock, $0.01 par value per share      
Entity Information [Line Items]      
Title of 12(b) Security Common Stock, $0.01 par value per share    
Trading Symbol DXC    
Security Exchange Name NYSE    
2.750% Senior Notes Due 2025      
Entity Information [Line Items]      
Title of 12(b) Security 2.750% Senior Notes Due 2025    
Trading Symbol DXC 25    
Security Exchange Name NYSE    
1.750% Senior Notes Due 2026      
Entity Information [Line Items]      
Title of 12(b) Security 1.750% Senior Notes Due 2026    
Trading Symbol DXC 26    
Security Exchange Name NYSE