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v3.21.2

Commitments and Contingencies - Guarantor Obligations (Details) $ in Millions | Sep. 30, 2021 USD ($)
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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

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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: |