Business Combination, Common Stock Conversion, Number of Shares Issued Per Share

No definition available.

Name:	dxc_BusinessCombinationCommonStockConversionNumberofSharesIssuedPerShare
Namespace Prefix:	dxc_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

Business Combination, Percentage Of Common Stock Shares Outstanding, Surviving Entity

+ References

No definition available.

+ Details

Name:	dxc_BusinessCombinationPercentageOfCommonStockSharesOutstandingSurvivingEntity
Namespace Prefix:	dxc_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of shares of equity interests issued or issuable to acquire entity.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (b)(4)
-URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479

+ Details

Name:	us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_BusinessAcquisitionLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266

+ Details

Name:	us-gaap_Goodwill
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Details

Name:	us-gaap_BusinessAcquisitionAxis=dxc_HewlettPackardEnterpriseServicesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=dxc_GBSSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=dxc_GISSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=dxc_UnitedStatesPublicSectorMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Acquisitions - HPES Merger Additional Information (Details) - USD ($) $ in Millions	Apr. 01, 2017	Dec. 31, 2018	Mar. 31, 2018
Business Acquisition [Line Items]
Goodwill		$ 7,593	$ 7,619
HPES
Business Acquisition [Line Items]
Shares issued for each share of CSC common stock (in shares)	1
Shares issued for merger consideration (in shares)	141,298,797
Percent ownership of CSC stockholders following the Merger	49.90%
Goodwill			7,392
GBS
Business Acquisition [Line Items]
Goodwill		4,608	4,531
GBS \| HPES
Business Acquisition [Line Items]
Goodwill			2,800
GIS
Business Acquisition [Line Items]
Goodwill		$ 2,985	3,088
GIS \| HPES
Business Acquisition [Line Items]
Goodwill			2,600
USPS \| HPES
Business Acquisition [Line Items]
Goodwill			$ 2,000