Earnings (Loss) Per Share (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Dec. 28, 2012	Dec. 30, 2011	Dec. 28, 2012	Dec. 30, 2011
Net income attributable to CSC common shareholders [Abstract]
From continuing operations	$ 120	$ (1,420)	$ 261	$ (4,194)
From discontinued operations	390	30	419	110
Net income (loss) attributable to CSC common shareholders	$ 510	$ (1,390)	$ 680	$ (4,084)
Common share information [Abstract]
Weighted average common shares outstanding for basic EPS (in shares)	155,039,000	155,061,000	155,209,000	154,983,000
Dilutive effect of stock options and equity awards (in shares)	1,045,000	0	639,000	0
Shares for diluted earnings (loss) per share (in shares)	156,084,000	155,061,000	155,848,000	154,983,000
Basic EPS:
Continuing operations (in dollars per share)	$ 0.77	$ (9.15)	$ 1.68	$ (27.06)
Discontinued operations (in dollars per share)	$ 2.52	$ 0.19	$ 2.70	$ 0.71
Basic EPS (in dollars per share)	$ 3.29	$ (8.96)	$ 4.38	$ (26.35)
Diluted EPS:
From continuing operations - diluted EPS (in dollars per share)	$ 0.77	$ (9.15)	$ 1.67	$ (27.06)
From discontinued operations - diluted EPS (in dollars per share)	$ 2.50	$ 0.19	$ 2.69	$ 0.71
Diluted EPS (in dollars per share)	$ 3.27	$ (8.96)	$ 4.36	$ (26.35)
Restricted Stock Units (RSUs) [Member]
Diluted EPS:
Antidilutive securities excluded from computation		766,188		1,322,903
Antidilutive Due to Net Loss Position [Member] | Stock options [Member]
Diluted EPS:
Antidilutive securities excluded from computation		24,193		826,872
Antidilution Due To Exercise Price Exceeding Average Market Price [Member] | Stock options [Member]
Diluted EPS:
Antidilutive securities excluded from computation	14,211,065	18,336,991	17,843,771	17,211,569