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		6 Months Ended
	Oct. 03, 2014	Sep. 27, 2013	Oct. 03, 2014	Sep. 27, 2013
Quantifying Misstatement in Current Year Financial Statements [Line Items]
Revenues	$ 3,080	$ 3,187	$ 6,317	$ 6,441
Costs of services (excludes depreciation and amortization and restructuring costs)	2,207	2,317	4,571	4,754
Selling, general and administrative	346	314	690	602
Depreciation and amortization	252	248	524	502
Restructuring costs	(7)	15	3	22
Interest expense	36	35	75	74
Interest income	(5)	(3)	(10)	(7)
Other expense, net	6	22	5	21
Income from continuing operations before taxes	245	239	459	473
Taxes on income	68	77	123	150
Income from continuing operations	177	162	336	323
(Loss) income from discontinued operations, net of taxes	(21)	80	(29)	96
Net income attributable to CSC common stockholders	151	232	297	406
Earnings Per Share, Diluted [Abstract]
Continuing operations (in dollars per share)	$ 1.18	$ 1.01	$ 2.22	$ 2.05
Discontinued operations (in dollars per share)	$ (0.14)	$ 0.53	$ (0.20)	$ 0.63
Diluted EPS (in dollars per share)	$ 1.04	$ 1.54	$ 2.02	$ 2.68
Adjustment Increase/(Decrease)
Quantifying Misstatement in Current Year Financial Statements [Line Items]
Revenues	(5)	11	9	23
Costs of services (excludes depreciation and amortization and restructuring costs)	(8)	(15)	22	9
Selling, general and administrative	0	(4)	0	0
Depreciation and amortization	(1)	(1)	(1)	(1)
Restructuring costs	0	0	0	2
Interest expense	0	0	0	0
Interest income	0	0
Other expense, net	0	0	0	0
Income from continuing operations before taxes	4	31	(12)	13
Taxes on income	4	(5)	(3)	(20)
Income from continuing operations	0	36	(9)	33
(Loss) income from discontinued operations, net of taxes	(2)	2	2	3
Net income attributable to CSC common stockholders	(2)	38	(7)	36
Earnings Per Share, Diluted [Abstract]
Continuing operations (in dollars per share)	$ 0.00	$ 0.24	$ (0.06)	$ 0.22
Discontinued operations (in dollars per share)	$ (0.01)	$ 0.01	$ 0.01	$ 0.02
Diluted EPS (in dollars per share)	$ (0.01)	$ 0.25	$ (0.05)	$ 0.24
Amount Adjusted for Removal of Errors
Quantifying Misstatement in Current Year Financial Statements [Line Items]
Revenues	3,075	3,198	6,326	6,464
Costs of services (excludes depreciation and amortization and restructuring costs)	2,199	2,302	4,593	4,763
Selling, general and administrative	346	310	690	602
Depreciation and amortization	251	247	523	501
Restructuring costs	(7)	15	3	24
Interest expense	36	35	75	74
Interest income	(5)	3
Other expense, net	6	22	5	21
Income from continuing operations before taxes	249	270	447	486
Taxes on income	72	72	120	130
Income from continuing operations	177	198	327	356
(Loss) income from discontinued operations, net of taxes	(23)	82	(27)	99
Net income attributable to CSC common stockholders	$ 149	$ 270	$ 290	$ 442
Earnings Per Share, Diluted [Abstract]
Continuing operations (in dollars per share)	$ 1.18	$ 1.25	$ 2.16	$ 2.27
Discontinued operations (in dollars per share)	$ (0.15)	$ 0.54	$ (0.19)	$ 0.65
Diluted EPS (in dollars per share)	$ 1.03	$ 1.79	$ 1.97	$ 2.92