Earnings Per Share (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Oct. 03, 2014	Sep. 27, 2013	Oct. 03, 2014	Sep. 27, 2013
Net income attributable to CSC common shareholders [Abstract]
From continuing operations	$ 172	$ 152	$ 326	$ 310
From discontinued operations	(21)	80	(29)	96
Net income attributable to CSC common stockholders	$ 151	$ 232	$ 297	$ 406
Common share information [Abstract]
Weighted average common shares outstanding for basic EPS (in shares)	143,279,000	148,047,000	144,346,000	148,951,000
Dilutive effect of stock options and equity awards (in shares)	2,317,000	2,926,000	2,809,000	2,525,000
Shares for diluted earnings (loss) per share (in shares)	145,596,000	150,973,000	147,155,000	151,476,000
Basic EPS:
Continuing operations (in dollars per share)	$ 1.20	$ 1.03	$ 2.26	$ 2.09
Discontinued operations (in dollars per share)	$ (0.15)	$ 0.54	$ (0.20)	$ 0.64
Basic EPS (in dollars per share)	$ 1.05	$ 1.57	$ 2.06	$ 2.73
Diluted EPS:
Diluted EPS - Continuing operations (in dollars per share)	$ 1.18	$ 1.01	$ 2.22	$ 2.05
Diluted EPS - Discontinued operations (in dollars per share)	$ (0.14)	$ 0.53	$ (0.20)	$ 0.63
Diluted EPS (in dollars per share)	$ 1.04	$ 1.54	$ 2.02	$ 2.68
Antidilution Due To Exercise Price Exceeding Average Market Price | Stock options
Diluted EPS:
Antidilutive securities excluded from computation	1,306,873	5,188,587	1,006,720	7,704,313
Antidilution Due To Exercise Price Exceeding Average Market Price | Restricted stock units
Diluted EPS:
Antidilutive securities excluded from computation	1,146,523	19,847	433,709	65,642