Defined Benefit Pension Plan Accounting Policy Changes Impact on Consolidated Statement of Operations (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
	Apr. 03, 2015	Mar. 28, 2014	Mar. 29, 2013
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Costs of services (excludes depreciation and amortization and restructuring costs)	$ 9,534		$ 11,293
Selling, general and administrative expenses	1,340
Income from continuing operations before taxes	(276)	1,263	235
Income tax (benefit) expense	(312)	383	(62)
Income (loss) from continuing operations	36	880
Net income (loss)	7	968	779
Net income attributable to noncontrolling interest, net of tax	15	21	19
Net income (loss) attributable to CSC common stockholders	(8)	947	760
Basic EPS - Continuing operations (in dollars per share)	$ 0.15	$ 5.81	$ 1.80
Previous accounting methods | As previously reported
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Costs of services (excludes depreciation and amortization and restructuring costs)	9,084
Selling, general and administrative expenses	1,271
Income from continuing operations before taxes	243
Income tax (benefit) expense	(164)
Income (loss) from continuing operations	407
Net income (loss)	378
Net income attributable to noncontrolling interest, net of tax	13
Net income (loss) attributable to CSC common stockholders	365
Basic EPS - Continuing operations (in dollars per share)	$ 2.76
Diluted EPS - Continuing operations (in dollars per share)	$ 2.70
Impact of change in accounting methods
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Costs of services	450
Selling, general and administrative expenses	69
Income from continuing operations, before taxes	(519)
Taxes on income	(148)
Loss from continuing operations	(371)
Net loss	(371)
Net income attributable to noncontrolling interest, net of tax	2
Net income (loss) attributable to CSC common stockholders	$ (373)
Basic EPS - Continuing operations (in dollars per share)	$ (2.61)
Diluted EPS - Continuing operations (in dollars per share)	$ (2.55)