Earnings (Loss) Per Share (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Dec. 30, 2011	Dec. 31, 2010	Dec. 30, 2011	Dec. 31, 2010
Net (loss) income attributable to CSC common shareholders:
From continuing operations	$ (1,392)	$ 243	$ (4,085)	$ 548
From discontinued operations	2	(1)	1	21
Net (loss) income attributable to CSC common shareholders	$ (1,390)	$ 242	$ (4,084)	$ 569
Common share information:
Weighted average common shares outstanding for basic EPS ( in millions of shares)	155,061,000	154,526,000	154,983,000	154,378,000
Dilutive effect of stock options and other equity awards ( in millions of shares)	0	2,190,000	0	2,056,000
Shares for diluted (loss) earnings per share ( in millions of shares)	155,061,000	156,716,000	154,983,000	156,434,000
Basic earnings (loss) per share:
Continuing operations (in dollars per share)	$ (8.97)	$ 1.58	$ (26.36)	$ 3.55
Discontinued operations (in dollars per share)	$ 0.01	$ (0.01)	$ 0.01	$ 0.14
Basic earnings (loss) per share (in dollars per share)	$ (8.96)	$ 1.57	$ (26.35)	$ 3.69
Diluted earnings (loss) per share:
Continuing operations (in dollars per share)	$ (8.97)	$ 1.55	$ (26.36)	$ 3.51
Discontinued operations (in dollars per share)	$ 0.01	$ (0.01)	$ 0.01	$ 0.13
Diluted earnings (loss) per share (in dollars per share)	$ (8.96)	$ 1.54	$ (26.35)	$ 3.64
Stock Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Securities excluded from computation of diluted earnings (loss) per share whose effect would have been anti-dilutive due to the Company's net loss (in shares)	790,381		2,149,775
Stock options excluded from diluted earnings (loss) per share whose exercise price exceeded the average market price (in shares)	18,336,991	9,730,532	17,211,569	9,597,005