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Pension and Other Benefit Plans - Narrative (Details) participant in Thousands, $ in Millions	12 Months Ended
	Mar. 31, 2025 USD ($) shares	Mar. 31, 2024 USD ($)	Mar. 31, 2023 USD ($) participant
Defined Benefit Plan Disclosure [Line Items]
Defined benefit pension obligations transferred			$ 1,000
Number of plan participants obligations transferred | participant			5
Pension settlement charge			$ 361
Measurement period used to calculate long-term rate of return on assets	30 years
Defined contribution plan contribution	$ 191	$ 188	$ 203
Shares of company common stock held in defined contribution plan assets (in shares) | shares	2,069,090
Non-employee directors
Defined Benefit Plan Disclosure [Line Items]
Deferred compensation plan, maximum deferral percentage	100.00%
Deferred compensation plan, liability	$ 28	31
Deferred compensation plan, expense	$ 2	$ 5

X

- Definition

The maximum amount of compensation that a plan participant is allowed to defer of their eligible compensation.

+ References

No definition available.

+ Details

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Namespace Prefix:	dxc_
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Balance Type:	na
Period Type:	duration

X

- Definition

Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets, Measurement Period

+ References

No definition available.

+ Details

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Period Type:	duration

X

- Definition

Defined Benefit Plan, Benefit Obligation, Transferred

+ References

No definition available.

+ Details

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Namespace Prefix:	dxc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Defined Benefit Plan, Number Of Plan Participants, Obligations Transferred

+ References

No definition available.

+ Details

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Namespace Prefix:	dxc_
Data Type:	xbrli:integerItemType
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X

- Definition

The number of shares of common stock included in the defined contribution plans at the fiscal year-end.

+ References

No definition available.

+ Details

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Balance Type:	na
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X

- Definition

Amount of contributions made by employer into fund established for purposes of making future disbursement to individual in accordance with deferred compensation arrangement.

+ References

No definition available.

+ Details

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

X

- Definition

The carrying amount of the liability as of the balance sheet date to an individual under a deferred compensation arrangement. This amount may be the result of periodic accruals made over the period of active employment, or reflect termination benefits resulting contractual terms or a death benefit.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 710
-SubTopic 10
-Name Accounting Standards Codification
-Section 30
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483043/710-10-30-1

+ Details

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Balance Type:	credit
Period Type:	instant

X

- Definition

Amount of payment, which decreases benefit obligation of defined benefit plan, for irrevocable action relieving primary responsibility for benefit obligation and eliminating risk for obligation and assets used to effect settlement. Transaction constituting settlement includes, but is not limited to, making lump-sum cash payment to participant in exchange for their rights to receive specified benefits and purchasing nonparticipating annuity contract. Excludes decreases to benefit obligation for remeasurement due to settlement.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (a)(10)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-1

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

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

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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of cost for defined contribution plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 70
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480794/715-70-50-1

+ Details

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Balance Type:	debit
Period Type:	duration

X

- Details

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Period Type: