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Commitments and Contingencies - Guarantor Obligations (Details) $ in Millions | Dec. 31, 2020 USD ($)
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Guarantor Obligations [Line Items] |
Remainder of Fiscal 2021 | $ 87
Fiscal 2022 | 281
Fiscal 2023 and Thereafter | 645
Total | 1,013
Surety bonds |
Guarantor Obligations [Line Items] |
Remainder of Fiscal 2021 | 14
Fiscal 2022 | 93
Fiscal 2023 and Thereafter | 87
Total | 194
Letters of credit |
Guarantor Obligations [Line Items] |
Remainder of Fiscal 2021 | 37
Fiscal 2022 | 147
Fiscal 2023 and Thereafter | 527
Total | 711
Stand-by letters of credit |
Guarantor Obligations [Line Items] |
Remainder of Fiscal 2021 | 36
Fiscal 2022 | 41
Fiscal 2023 and Thereafter | 31
Total | $ 108

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- 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

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- 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

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- 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

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- 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

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- 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

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

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- 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: |