Acquisitions - Fiscal 2017 Acquisitions (Details) - USD ($)			3 Months Ended
	Jul. 05, 2016	May 05, 2016	Jun. 30, 2017	Jul. 01, 2016	Mar. 31, 2017	[1]
Business Acquisition [Line Items]
Payments for acquisitions, net of cash acquired			$ 0	$ 423,000,000
Goodwill			$ 8,774,000,000		$ 1,855,000,000
Aspediens
Business Acquisition [Line Items]
Total estimated consideration transferred	$ 15,000,000
Xchanging
Business Acquisition [Line Items]
Total estimated consideration transferred		$ 693,000,000
Payments for acquisitions, net of cash acquired		492,000,000
Transaction costs		17,000,000
Current assets acquired		396,000,000
Noncurrent assets		99,000,000
Intangible assets		582,000,000
Current liabilities		267,000,000
Long-term liabilities		516,000,000
Goodwill		680,000,000
Noncontrolling interest		281,000,000
Expected tax deductible amount of goodwill acquired		$ 0
Xchanging | Developed technology | Minimum
Business Acquisition [Line Items]
Estimated Useful Lives (Years)		7 years
Xchanging | Developed technology | Maximum
Business Acquisition [Line Items]
Estimated Useful Lives (Years)		8 years
Xchanging | Customer relationships
Business Acquisition [Line Items]
Estimated Useful Lives (Years)		15 years
Xchanging | Trade names | Minimum
Business Acquisition [Line Items]
Estimated Useful Lives (Years)		3 years
Xchanging | Trade names | Maximum
Business Acquisition [Line Items]
Estimated Useful Lives (Years)		5 years

[1] Certain prior year amounts were adjusted to retroactively reflect the legal capital of DXC.