Earnings (Loss) Per Share (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Sep. 28, 2012	Sep. 30, 2011	Sep. 28, 2012	Sep. 30, 2011
Net income attributable to CSC common shareholders [Abstract]
From continuing operations			$ 170	$ (2,693)
From discontinued operations			0	(1)
Net income (loss) attributable to CSC common shareholders	$ 130	$ (2,877)	$ 170	$ (2,694)
Common share information [Abstract]
Weighted average common shares outstanding for basic EPS (in shares)	155,360,000	155,045,000	155,293,000	154,944,000
Dilutive effect of stock options and equity awards (in shares)	394,000	0	449,000	0
Shares for diluted earnings (loss) per share (in shares)	155,754,000	155,045,000	155,742,000	154,944,000
Basic EPS:
Continuing operations (in dollars per share)	$ 0.84	$ (18.56)	$ 1.09	$ (17.38)
Discontinued operations (in dollars per share)	$ 0.00	$ 0.00	$ 0.00	$ (0.01)
Basic EPS (in dollars per share)	$ 0.84	$ (18.56)	$ 1.09	$ (17.39)
Diluted EPS:
From continuing operations - diluted EPS (in dollars per share)	$ 0.83	$ (18.56)	$ 1.09	$ (17.38)
From discontinued operations - diluted EPS (in dollars per share)	$ 0.00	$ 0.00	$ 0.00	$ (0.01)
Diluted EPS (in dollars per share)	$ 0.83	$ (18.56)	$ 1.09	$ (17.39)
Restricted Stock Units (RSUs) [Member]
Diluted EPS:
Antidilutive securities excluded from computation		940,803		1,276,484
Antidilutive Due to Net Loss Position [Member] | Stock Options [Member]
Diluted EPS:
Antidilutive securities excluded from computation		336,770		997,491
Antidilution Due To Exercise Price Exceeding Average Market Price [Member] | Stock Options [Member]
Diluted EPS:
Antidilutive securities excluded from computation	18,393,875	18,398,637	18,553,562	16,879,578