Reconciliation of Previously Reported Amounts (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Dec. 30, 2016	Jan. 01, 2016		Dec. 30, 2016	Jan. 01, 2016
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Income from continuing operations, before taxes	$ 50	$ 78	[1]	$ 13	$ 197	[1]
Income tax expense (benefit)	13	56	[1]	(25)	17	[1]
Income from continuing operations	37	22	[1]	38	180	[1]
Income from discontinued operations	0	30	[1]	0	216	[1]
Net income	37	52	[1]	38	396	[1],[2],[3]
Net income attributable to CSC common stockholders	$ 31	50	[1]	$ 25	384	[1]
Restatement adjustment | Certain errors related to income taxes
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Income from continuing operations		3			(6)
As Previously Reported
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Income from continuing operations, before taxes		78			197
Income tax expense (benefit)		63			31
Income from continuing operations		15			166
Income from discontinued operations		30			216
Net income		45			382
Net income attributable to CSC common stockholders		43			370
Adjustment | Adoption of ASU 2016-09
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Income from continuing operations, before taxes		0			0
Income tax expense (benefit)		(4)			(20)
Income from continuing operations		4			20
Income from discontinued operations		0			0
Net income		4			20
Net income attributable to CSC common stockholders		4			20
Adjustment | Correction of Prior Period Misstatement
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Income from continuing operations, before taxes		0			0
Income tax expense (benefit)		(3)			6
Income from continuing operations		3			(6)
Income from discontinued operations		0			0
Net income		3			(6)
Net income attributable to CSC common stockholders		$ 3			$ (6)

[1] Certain prior year balances were adjusted for certain errors in previously issued financial statements related to income taxes and for the adoption of ASU 2016-09 related to employee stock-based compensation. See Note 20 - Reconciliation of Previously Reported Amounts.

[2] Certain prior year balances were adjusted for certain errors in previously issued financial statements related to income taxes and for the adoption of ASU 2016-09 related to employee stock-based compensation as described in Note 20 - Reconciliation of Previously Reported Amounts.

[3] Certain prior year balances were adjusted for certain errors in previously issued financial statements related to income taxes and for the adoption of ASU 2016-09 related to employee stock-based compensation. See Note 20 - Reconciliation of Previously Reported Amounts.