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		9 Months Ended
	Dec. 27, 2013	Dec. 28, 2012	Dec. 27, 2013	Dec. 28, 2012
Quantifying Misstatement in Current Year Financial Statements [Line Items]
Revenues	$ 3,228	$ 3,536	$ 9,669	$ 10,692
Costs of services (excludes depreciation and amortization and restructuring costs)	2,362	2,767	7,156	8,447
Selling, general and administrative	354	271	962	846
Depreciation and amortization	251	268	753	801
Restructuring costs	11	26	33	111
Interest expense	38	57	112	147
Other (income) expense, net	(5)	7	16	8
Income from continuing operations before taxes	221	144	648	346
Taxes on income	70	30	206	95
Income from continuing operations	151	114	442	251
(Loss) income from discontinued operations, net of taxes	(5)	399	72	442
Net income attributable to CSC common stockholders	141	510	500	680
Earnings Per Share, Diluted [Abstract]
Continuing operations (in dollars per share)	$ 0.98	$ 0.71	$ 2.83	$ 1.52
Discontinued operations (in dollars per share)	$ (0.04)	$ 2.56	$ 0.48	$ 2.84
Diluted EPS (in dollars per share)	$ 0.94	$ 3.27	$ 3.31	$ 4.36
Adjustment Increase/(Decrease)
Quantifying Misstatement in Current Year Financial Statements [Line Items]
Revenues	(8)	0	21	9
Costs of services (excludes depreciation and amortization and restructuring costs)	5	2	23	16
Selling, general and administrative	(1)	1	0	(1)
Depreciation and amortization	0	(3)	(1)	(5)
Restructuring costs	0	2	2	1
Interest expense	0	(1)	0	0
Other (income) expense, net	0	(1)	0	0
Income from continuing operations before taxes	(12)	0	(3)	(2)
Taxes on income	1	6	(21)	10
Income from continuing operations	(13)	(6)	18	(12)
(Loss) income from discontinued operations, net of taxes	0	0	0	0
Net income attributable to CSC common stockholders	(13)	(6)	18	(12)
Earnings Per Share, Diluted [Abstract]
Continuing operations (in dollars per share)	$ (0.09)	$ (0.04)	$ 0.12	$ (0.08)
Discontinued operations (in dollars per share)	$ 0.00	$ 0.00	$ 0.00	$ 0.00
Diluted EPS (in dollars per share)	$ (0.09)	$ (0.04)	$ 0.12	$ (0.08)
Amount Adjusted for Removal of Errors
Quantifying Misstatement in Current Year Financial Statements [Line Items]
Revenues	3,220	3,536	9,690	10,701
Costs of services (excludes depreciation and amortization and restructuring costs)	2,367	2,769	7,179	8,463
Selling, general and administrative	353	272	962	845
Depreciation and amortization	251	265	752	796
Restructuring costs	11	28	35	112
Interest expense	38	56	112	147
Other (income) expense, net	(5)	6	16	8
Income from continuing operations before taxes	209	144	645	344
Taxes on income	71	36	185	105
Income from continuing operations	138	108	460	239
(Loss) income from discontinued operations, net of taxes	(5)	399	72	442
Net income attributable to CSC common stockholders	$ 128	$ 504	$ 518	$ 668
Earnings Per Share, Diluted [Abstract]
Continuing operations (in dollars per share)	$ 0.89	$ 0.67	$ 2.95	$ 1.44
Discontinued operations (in dollars per share)	$ (0.04)	$ 2.56	$ 0.48	$ 2.84
Diluted EPS (in dollars per share)	$ 0.85	$ 3.23	$ 3.43	$ 4.28