Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Jul. 01, 2016	Jul. 03, 2015
Net income attributable to CSC common stockholders
From continuing operations	$ (21)	$ 65
From discontinued operations	0	98
Net (loss) income attributable to CSC common stockholders	$ (21)	$ 163	[1]
Common share information:
Weighted average common shares outstanding for basic EPS (in shares)	138,980,000	137,920,000
Dilutive effect of stock options and equity awards (in shares)	0	3,470,000
Weighted average common shares outstanding for diluted EPS (in shares)	138,980,000	141,390,000
Basic EPS:
Basic EPS - Continuing operations (in dollars per share)	$ (0.15)	$ 0.47	[1]
Basic EPS - Discontinued Operations (in dollars per share)	0.00	0.71	[1]
Earnings per common share - basic (in dollars per share)	(0.15)	1.18	[1]
Diluted EPS:
Diluted EPS - Continuing operations (in dollars per share)	(0.15)	0.46	[1]
Diluted EPS - Discontinued operations (in dollars per share)	0.00	0.69	[1]
Earnings per common share - diluted (in dollars per share)	$ (0.15)	$ 1.15	[1]
Weighted average common shares outstanding for diluted EPS (in shares)	138,980,000	141,390,000
Antidilution Due To Exercise Price Exceeding Average Market Price | Employee stock option
Antidilutive securities excluded from computation (in shares)	1,507,757	1,534,173
Antidilution Due To Exercise Price Exceeding Average Market Price | Performance stock units
Antidilutive securities excluded from computation (in shares)	1,070,917
Antidilution Due To Exercise Price Exceeding Average Market Price | Restricted Stock Units (RSUs)
Antidilutive securities excluded from computation (in shares)	876,785	80,994
New accounting pronouncement, early adoption, effect
Common share information:
Weighted average common shares outstanding for diluted EPS (in shares)		141,390,000
Weighted average common shares outstanding for diluted EPS (in shares)		141,390,000
New Accounting Pronouncement, Early Adoption, Calculation Under Previous Guidance
Common share information:
Weighted average common shares outstanding for diluted EPS (in shares)		140,800,000
Weighted average common shares outstanding for diluted EPS (in shares)		140,800,000

[1] Certain prior year balances were adjusted for certain errors in previously issued financial statements related to income taxes, for the adoption of ASU 2016-09 related to employee stock-based compensation and to give effect to discontinued operations. See Note 19 Reconciliation of Previously Reported Amounts.