Acquisitions and Divestitures (Acquisitions) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended				0 Months Ended	3 Months Ended		9 Months Ended			3 Months Ended		9 Months Ended			12 Months Ended
	Dec. 28, 2012	Dec. 30, 2011	Dec. 28, 2012	Dec. 30, 2011	Mar. 30, 2012	Sep. 28, 2012 Acquisition of privately held entities [Member]	Jul. 31, 2011 iSOFT Group Limited [Member]	Dec. 28, 2012 iSOFT Group Limited [Member]	Dec. 30, 2011 iSOFT Group Limited [Member]	Dec. 28, 2012 iSOFT Group Limited [Member]	Dec. 30, 2011 iSOFT Group Limited [Member]	Jul. 29, 2011 iSOFT Group Limited [Member]	Dec. 28, 2012 AppLabs Acquisition [Member]	Dec. 30, 2011 AppLabs Acquisition [Member]	Dec. 28, 2012 AppLabs Acquisition [Member]	Dec. 30, 2011 AppLabs Acquisition [Member]	Sep. 13, 2011 AppLabs Acquisition [Member]	Mar. 30, 2012 Other Acquisition [Member] Businesses
Assets acquired and liabilities assumed [Abstract]
Total cash consideration paid						$ 35						$ 200					$ 171	$ 28
Acquistion purchase price for current assets						4
Acquistion purchase price for intangibles						8
Acquistion purchase price for liabilities						(2)
Goodwill	1,523		1,523		1,752	25
Debt assumed												315
Acquired debt paid off							298
Number of Businesses Acquired																		2
Additional consideration																		2
Results of acquisitions included in consolidated financial statements [Abstract]
Operating income (loss)	268	(1,307)	698	(1,251)				(24)	(30)	(72)	(58)		2	3	7	4
Summary of consolidated information as reported [Abstract]
Revenue	3,781	3,687	11,434	11,527				56	49	159	81		23	28	76	34
Net Income (Loss) Attributable to Parent	510	(1,390)	680	(4,084)
Basic EPS (in dollars per share)	$ 3.29	$ (8.96)	$ 4.38	$ (26.35)
Diluted EPS (in dollars per share)	$ 3.27	$ (8.96)	$ 4.36	$ (26.35)
Unaudited pro forma summary of consolidated information [Abstract]
Revenue				11,605
Net loss attributable to CSC common shareholders				(4,153)
Basic EPS (in dollars per share)				$ (26.79)
Diluted EPS (in dollars per share)				$ (26.79)
Goodwill impairment	0	60	0	2,745							37
Transaction costs excluded									$ 11		$ 11