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Segment Information (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Segment Reporting Information [Line Items]
Revenues	$ 4,027	$ 4,554	$ 8,168	$ 9,056
Segment profit	346	283	678	473
Depreciation and amortization	338	373	651	717
Amortization of acquired intangible assets	110	152	219	300
Reconciliation of Consolidated Operating Income to Income Before Taxes [Abstract]
Segment profit	346	283	678	473
Interest income	16	25	36	48
Interest expense	(61)	(96)	(123)	(202)
Restructuring costs	(145)	(265)	(212)	(337)
Transaction, separation and integration-related costs	(3)	(101)	(12)	(211)
Amortization of acquired intangible assets	(110)	(152)	(219)	(300)
Gains and (losses) on dispositions	0	0	347	0
Impairment losses	(10)	0	(10)	0
Debt extinguishment costs	(281)	0	(309)	0
Pension and OPEB actuarial and settlement losses	0	0	0	(2)
(Loss) income before income taxes	(248)	(306)	176	(531)
Operating segments
Segment Reporting Information [Line Items]
Revenues	4,027	4,554	8,168	9,056
Segment profit	416	353	819	591
Depreciation and amortization	308	350	594	667
Reconciliation of Consolidated Operating Income to Income Before Taxes [Abstract]
Segment profit	416	353	819	591
All Other
Segment Reporting Information [Line Items]
Revenues	0	0	0	0
Segment profit	(70)	(70)	(141)	(118)
Depreciation and amortization	30	23	57	50
Reconciliation of Consolidated Operating Income to Income Before Taxes [Abstract]
Segment profit	(70)	(70)	(141)	(118)
GBS | Operating segments
Segment Reporting Information [Line Items]
Revenues	1,873	2,242	3,760	4,416
Segment profit	298	317	570	532
Depreciation and amortization	51	59	91	109
Reconciliation of Consolidated Operating Income to Income Before Taxes [Abstract]
Segment profit	298	317	570	532
GIS | Operating segments
Segment Reporting Information [Line Items]
Revenues	2,154	2,312	4,408	4,640
Segment profit	118	36	249	59
Depreciation and amortization	257	291	503	558
Reconciliation of Consolidated Operating Income to Income Before Taxes [Abstract]
Segment profit	$ 118	$ 36	$ 249	$ 59

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

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

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- Details

Name:	srt_ConsolidationItemsAxis=us-gaap_OperatingSegmentsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_ConsolidationItemsAxis=us-gaap_MaterialReconcilingItemsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=dxc_GBSSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=dxc_GISSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: