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Commitments and Contingencies - Guarantor Obligations (Details) $ in Millions	Sep. 30, 2021 USD ($)
Guarantor Obligations [Line Items]
Remainder of Fiscal 2022	$ 176
Fiscal 2023	168
Fiscal 2024 and Thereafter	554
Total	898
Surety bonds
Guarantor Obligations [Line Items]
Remainder of Fiscal 2022	10
Fiscal 2023	56
Fiscal 2024 and Thereafter	12
Total	78
Letters of credit
Guarantor Obligations [Line Items]
Remainder of Fiscal 2022	139
Fiscal 2023	55
Fiscal 2024 and Thereafter	528
Total	722
Stand-by letters of credit
Guarantor Obligations [Line Items]
Remainder of Fiscal 2022	27
Fiscal 2023	57
Fiscal 2024 and Thereafter	14
Total	$ 98

X

- Definition

Expiration Of Guarantee In First Fiscal Year

+ References

No definition available.

+ Details

Name:	dxc_ExpirationOfGuaranteeInFirstFiscalYear
Namespace Prefix:	dxc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount of financial guarantee outstanding as of the balance sheet date, that expires in the next fiscal year following current fiscal year end.

+ References

No definition available.

+ Details

Name:	dxc_ExpirationOfGuaranteeInNextFiscalYear
Namespace Prefix:	dxc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount of financial guarantee outstanding as of the balance sheet date, that expires in the third fiscal year and thereafter following current fiscal year end.

+ References

No definition available.

+ Details

Name:	dxc_ExpirationOfGuaranteeInSecondFiscalYearAndThereafter
Namespace Prefix:	dxc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount of total financial guarantees outstanding.

+ References

No definition available.

+ Details

Name:	dxc_TotalGuaranteesOutstanding
Namespace Prefix:	dxc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

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

X

- Details

Name:	us-gaap_GuaranteeObligationsByNatureAxis=dxc_SuretyBondsPerformanceGuaranteeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_GuaranteeObligationsByNatureAxis=dxc_LettersOfCreditPerformanceGuaranteeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_GuaranteeObligationsByNatureAxis=us-gaap_FinancialStandbyLetterOfCreditMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: