Debt Instrument, Extension Term

No definition available.

Name:	dxc_DebtInstrumentExtensionTerm
Namespace Prefix:	dxc_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400

+ Details

Name:	us-gaap_DebtInstrumentFaceAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

The cash inflow from additional borrowings, net of cash paid to third parties in connection with debt origination.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3255-108585

+ Details

Name:	us-gaap_ProceedsFromDebtNetOfIssuanceCosts
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3291-108585

+ Details

Name:	us-gaap_RepaymentsOfDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

No definition available.

+ Details

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

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_RevolvingCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_LineOfCreditMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=dxc_SeniorNotesDue2023ThreeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_SeniorNotesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=dxc_SeniorNotesDue2025TwoMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=dxc_TermLoanPayableEURDue2022Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_NotesPayableToBanksMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=dxc_TermLoanPayableGBPDue2022Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=dxc_TermLoanPayableAUDDue2022Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=dxc_TermLoanPayableUSDDue2025Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Subsequent Events (Details)							12 Months Ended
Subsequent Events (Details)	May 15, 2020	Apr. 21, 2020 USD ($)	Apr. 21, 2020 EUR (€)	Apr. 21, 2020 GBP (£)	Apr. 21, 2020 AUD ($)	Apr. 06, 2020 USD ($)	Mar. 31, 2020 USD ($)	Apr. 21, 2020 EUR (€)	Apr. 21, 2020 GBP (£)	Apr. 21, 2020 AUD ($)
Revolving credit facility \| Line of credit
Subsequent Event [Line Items]
Debt issued							$ 1,500,000,000
Revolving credit facility \| Line of credit \| Subsequent Event
Subsequent Event [Line Items]
Debt issued						$ 2,500,000,000
Senior Notes Due 2023 \| Senior notes \| Subsequent Event
Subsequent Event [Line Items]
Face amount		$ 500,000,000
Stated interest rate		4.00%						4.00%	4.00%	4.00%
Senior Notes Due 2025 \| Senior notes \| Subsequent Event
Subsequent Event [Line Items]
Debt issued		$ 993,000,000
Face amount		$ 500,000,000
Stated interest rate		4.125%						4.125%	4.125%	4.125%
EUR term loan \| Loans payable \| Subsequent Event
Subsequent Event [Line Items]
Face amount \| €								€ 750,000,000
Debt prepayed \| €			€ 500,000,000
Extension term	1 year
GBP term loan \| Loans payable \| Subsequent Event
Subsequent Event [Line Items]
Face amount \| £									£ 500,000,000
Debt prepayed \| £				£ 150,000,000
AUD term loan \| Loans payable \| Subsequent Event
Subsequent Event [Line Items]
Face amount										$ 500,000,000
Debt prepayed					$ 300,000,000
USD term loan \| Loans payable \| Subsequent Event
Subsequent Event [Line Items]
Face amount		$ 500,000,000
Debt prepayed		$ 100,000,000