Investigations and Out of Period Adjustments (Impact on Consolidated Statement of Operations) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended	12 Months Ended
	Sep. 30, 2011	Mar. 28, 2014	Mar. 29, 2013	Mar. 30, 2012
Quantifying Misstatement in Current Year Financial Statements [Line Items]
Revenues		$ 12,998	$ 14,195	$ 14,673
Cost of Services		9,272	11,293	12,643
Costs of services - settlement charge (excludes amount charged to revenue of $42)	227	0	0	227
Costs of services - specified contract charge (excludes amount charged to revenue of $204)				0
Selling, General and Administrative Expense		1,220	1,197	1,145
Depreciation and amortization		1,018	1,070	1,139
Restructuring costs		76	264	140
Interest expense		147	183	171
Other expense (income), net		18	(25)	6
Income (loss) from continuing operations before taxes		1,263	235	(992)
Taxes on income		383	(62)	(228)
Income from continuing operations, net of tax		880	297	(764)
Income from discontinued operations, net of taxes		88	482	162
Net income (loss) attributable to CSC common stockholders		947	760	(616)
Earnings Per Share, Diluted [Abstract]
Continuing operations (in dollars per share)		$ 5.70	$ 1.79	$ (5.02)
Discontinued operations (in dollars per share)		$ 0.58	$ 3.10	$ 1.05
Diluted EPS (in dollars per share)		$ 6.28	$ 4.89	$ (3.97)
Adjustment Increase/(Decrease)
Quantifying Misstatement in Current Year Financial Statements [Line Items]
Revenues		21	(2)	(18)
Cost of Services		23	(13)	7
Selling, General and Administrative Expense				1
Depreciation and amortization		(2)	(2)	1
Restructuring costs		2	3	(5)
Income (loss) from continuing operations before taxes		(2)	10	(22)
Taxes on income		(18)	30	(4)
Income from continuing operations, net of tax		16	(20)	(18)
Income from discontinued operations, net of taxes		2	(2)
Net income (loss) attributable to CSC common stockholders		18	(22)	(18)
Earnings Per Share, Diluted [Abstract]
Continuing operations (in dollars per share)		$ 0.11	$ (0.13)	$ (0.12)
Discontinued operations (in dollars per share)		$ 0.01	$ (0.01)
Diluted EPS (in dollars per share)		$ 0.12	$ (0.14)	$ (0.12)
Amount Adjusted for Removal of Errors [Member]
Quantifying Misstatement in Current Year Financial Statements [Line Items]
Revenues		13,019	14,193	14,655
Cost of Services		9,295	11,280	12,650
Selling, General and Administrative Expense				1,146
Depreciation and amortization		1,016	1,068	1,140
Restructuring costs		78	267	135
Income (loss) from continuing operations before taxes		1,261	245	(1,014)
Taxes on income		365	(32)	(232)
Income from continuing operations, net of tax		896	277	(782)
Income from discontinued operations, net of taxes		90	480
Net income (loss) attributable to CSC common stockholders		$ 965	$ 738	$ (634)
Earnings Per Share, Diluted [Abstract]
Continuing operations (in dollars per share)		$ 5.81	$ 1.66	$ (5.14)
Discontinued operations (in dollars per share)		$ 0.59	$ 3.09
Diluted EPS (in dollars per share)		$ 6.40	$ 4.75	$ (4.09)