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
	Jan. 02, 2015	Dec. 27, 2013	Jan. 02, 2015	Dec. 27, 2013
Quantifying Misstatement in Current Year Financial Statements [Line Items]
Revenues	$ 2,947	$ 3,228	$ 9,264	$ 9,669
Costs of services (excludes depreciation and amortization and restructuring costs)	2,530	2,261	7,101	7,015
Selling, general and administrative	356	318	1,046	920
Depreciation and amortization	238	251	762	753
Restructuring costs	12	11	15	33
Interest expense	37	38	112	112
Interest income	(4)	(4)	(14)	(11)
Other (income) expense, net	1	(5)	6	16
(Loss) income from continuing operations, before taxes	(418)	358	41	831
Taxes on income	(105)	77	18	227
(Loss) income from continuing operations	(313)	281	23	604
(Loss) income from discontinued operations, net of taxes	0	(5)	(29)	91
Net (loss) income attributable to CSC common stockholders	(314)	271	(17)	677
Earnings Per Share, Diluted [Abstract]
Continuing operations (in dollars per share)	$ (2.23)	$ 1.84	$ 0.08	$ 3.88
Discontinued operations (in dollars per share)	$ 0.00	$ (0.03)	$ (0.20)	$ 0.60
Diluted EPS (in dollars per share)	$ (2.23)	$ 1.81	$ (0.12)	$ 4.48
Adjustment Increase/(Decrease) [Member]
Quantifying Misstatement in Current Year Financial Statements [Line Items]
Revenues	(1)	(5)	9	17
Costs of services (excludes depreciation and amortization and restructuring costs)	3	8	22	16
Selling, general and administrative	0	(1)	0	0
Depreciation and amortization	0	0	(1)	(1)
Restructuring costs	0	0	0	2
Interest expense	0	0	0	0
Interest income	0	0
Other (income) expense, net	0	0	0	0
(Loss) income from continuing operations, before taxes	(4)	(12)		0
Taxes on income	6	(4)		(24)
(Loss) income from continuing operations	(10)	(8)	(17)	24
(Loss) income from discontinued operations, net of taxes	0	(3)	2	0
Net (loss) income attributable to CSC common stockholders	(10)	(11)	(15)	24
Earnings Per Share, Diluted [Abstract]
Continuing operations (in dollars per share)	$ (0.07)	$ (0.05)	$ (0.12)	$ 0.16
Discontinued operations (in dollars per share)	$ 0.00	$ (0.02)	$ 0.01	$ 0.00
Diluted EPS (in dollars per share)	$ (0.07)	$ (0.07)	$ (0.11)	$ 0.16
Amount Adjusted for Removal of Errors [Member]
Quantifying Misstatement in Current Year Financial Statements [Line Items]
Revenues	2,946	3,223	9,273	9,686
Costs of services (excludes depreciation and amortization and restructuring costs)	2,533	2,269	7,123	7,031
Selling, general and administrative	356	317	1,046	920
Depreciation and amortization	238	251	761	752
Restructuring costs	12	11	15	35
Interest expense	37	38	112	112
Interest income	(4)	(4)
Other (income) expense, net	1	(5)	6	16
(Loss) income from continuing operations, before taxes	(422)	346	29	831
Taxes on income	(99)	73	23	203
(Loss) income from continuing operations	(323)	273	6	628
(Loss) income from discontinued operations, net of taxes	0	(8)	(27)	91
Net (loss) income attributable to CSC common stockholders	$ (324)	$ 260	$ (32)	$ 701
Earnings Per Share, Diluted [Abstract]
Continuing operations (in dollars per share)	$ (2.30)	$ 1.79	$ (0.04)	$ 4.04
Discontinued operations (in dollars per share)	$ 0.00	$ (0.05)	$ (0.19)	$ 0.60
Diluted EPS (in dollars per share)	$ (2.30)	$ 1.74	$ (0.23)	$ 4.64