Acquisitions (Details) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended						0 Months Ended		3 Months Ended
	Mar. 28, 2014		Mar. 29, 2013		Mar. 30, 2012		Nov. 15, 2013	Aug. 05, 2013	Sep. 28, 2012	Dec. 27, 2013
Summary of consolidated information as reported [Abstract]
Revenues	$ 12,998		$ 14,195		$ 14,673
Net Income (Loss) Attributable to Parent	947		760		(616)
Basic EPS (in dollars per share)	$ 6.41		$ 4.92		$ (3.97)
Diluted EPS (in dollars per share)	$ 6.28		$ 4.89		$ (3.97)
Results of acquisitions included in consolidated financial statements [Abstract]
Revenues	12,998		14,195		14,673
Operating income (loss)	1,416		961		77
Pre-tax net income (loss)	1,263		235		(992)
Assets acquired and liabilities assumed [Abstract]
Goodwill impairment	0		0		232
Fair value of accounts receivable [Abstract]
Net Income (Loss) Attributable to Parent	947		760		(616)
Unaudited pro forma summary of consolidated information [Abstract]
Revenue					14,751
Net (loss) income attributable to CSC common shareholders					(718)
Basic EPS (in dollars per share)					$ (4.63)
Diluted EPS (in dollars per share)					$ (4.63)
Payment of contingent consideration	(98)		0		0
Goodwill	1,667		1,516		1,752
Amortization expense	402		414		441
GBS Segment [Member]
Summary of consolidated information as reported [Abstract]
Revenues	4,321		4,844		5,007
Results of acquisitions included in consolidated financial statements [Abstract]
Revenues	4,321		4,844		5,007
Operating income (loss)	574		401		78
Unaudited pro forma summary of consolidated information [Abstract]
Goodwill	680		645		906
GIS Segment [Member]
Unaudited pro forma summary of consolidated information [Abstract]
Goodwill	199		78		78
NPS [Member]
Summary of consolidated information as reported [Abstract]
Revenues	4,099	[1]	4,662	[1]	4,885	[1]
Results of acquisitions included in consolidated financial statements [Abstract]
Revenues	4,099	[1]	4,662	[1]	4,885	[1]
Operating income (loss)	524	[1]	511	[1]	145	[1]
Unaudited pro forma summary of consolidated information [Abstract]
Goodwill	788		793		768
Developed Technology Rights [Member]
Assets acquired and liabilities assumed [Abstract]
Estimated useful life	9 years
Customer Relationships [Member]
Assets acquired and liabilities assumed [Abstract]
Estimated useful life	3 years
ServiceMesh, Inc
Business Acquisition [Line Items]
Goodwill							282
Summary of consolidated information as reported [Abstract]
Revenues	18
Results of acquisitions included in consolidated financial statements [Abstract]
Revenues	18
Operating income (loss)	17
Assets acquired and liabilities assumed [Abstract]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables and Other Current Assets							3
Business Combination, Consideration Transferred							163
Unaudited pro forma summary of consolidated information [Abstract]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Financial Liabilities							10
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Contingent Liability							119
Business Combination, Contingent Consideration, Liability							98
Payment of contingent consideration	18
Business Combination, Acquisition Related Costs							4
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Assets, Current							31
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment and Other Noncurrent Assets							2
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accounts Payable, Accrued Expenses and Deferred Revenue							4
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities, Current							38
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net							98
Goodwill							184
Amortization expense	4
ServiceMesh, Inc | Selling, General and Administrative Expenses [Member]
Unaudited pro forma summary of consolidated information [Abstract]
Business Combination, Contingent Consideration, Liability							21
ServiceMesh, Inc | GBS Segment [Member]
Unaudited pro forma summary of consolidated information [Abstract]
Goodwill							28
ServiceMesh, Inc | GIS Segment [Member]
Unaudited pro forma summary of consolidated information [Abstract]
Goodwill							120
ServiceMesh, Inc | NPS [Member]
Unaudited pro forma summary of consolidated information [Abstract]
Goodwill							36
ServiceMesh, Inc | Developed Technology Rights [Member]
Business Acquisition [Line Items]
Intangible assets							94
ServiceMesh, Inc | Customer Relationships and Trade Names [Member]
Business Acquisition [Line Items]
Intangible assets							10
InfoChimps Inc [Member]
Business Acquisition [Line Items]
Current assets								2
Liabilities								2
Unaudited pro forma summary of consolidated information [Abstract]
Goodwill								27
Payments to Acquire Businesses, Gross								27
Acquisition of privately held entities [Member]
Business Acquisition [Line Items]
Current assets									4
Intangible assets									8
Liabilities									2
Goodwill									25
Unaudited pro forma summary of consolidated information [Abstract]
Payments to Acquire Businesses, Gross									35
AppLabs Acquisition [Member]
Business Acquisition [Line Items]
Intangible assets					26
Goodwill					171
Summary of consolidated information as reported [Abstract]
Revenues					60
Results of acquisitions included in consolidated financial statements [Abstract]
Revenues					60
Operating income (loss)					2
Assets acquired and liabilities assumed [Abstract]
Cash and cash equivalents					4
Trade and other receivables					20
Other current assets					8
Property and equipment					4
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Trade Payables And Accrued Expenses					26
Income tax liabilities and deferred income taxes					(20)
Other liabilities					(2)
Unaudited pro forma summary of consolidated information [Abstract]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net					14
Goodwill					157
Payments to Acquire Businesses, Gross					171
AppLabs Acquisition [Member] | Customer Relationships [Member]
Business Acquisition [Line Items]
Intangible assets					25
Assets acquired and liabilities assumed [Abstract]
Estimated useful life, lower range			2 years
Estimated useful life, upper range			8 years
AppLabs Acquisition [Member] | Software
Business Acquisition [Line Items]
Intangible assets					1
Assets acquired and liabilities assumed [Abstract]
Estimated useful life, lower range			1 year
Estimated useful life, upper range			5 years
iSOFT Group Limited [Member]
Business Acquisition [Line Items]
Intangible assets			198		198
Goodwill					200
Acquired debt paid off			298
Summary of consolidated information as reported [Abstract]
Revenues			123
Results of acquisitions included in consolidated financial statements [Abstract]
Revenues			123
Operating income (loss)			79
Currency gains			18
Pre-tax net income (loss)			61
Assets acquired and liabilities assumed [Abstract]
Cash and cash equivalents					26
Property and equipment					21
Business Acquisition, Purchase Price Allocation, Other Noncurrent Assets					3
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Taxes Payable and Accrued Expenses					62
Trade payables and accrued expenses					(114)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Other					14
Deferred revenue					(54)
Debt			(315)		(315)
Other liabilities					(61)
Goodwill impairment			37
Fair value of accounts receivable [Abstract]
Uncollectible contractual receivables			10
Tax deductible goodwill			71
Transaction costs included (excluded) due to integration of acquisition into Company's operations			11
Unaudited pro forma summary of consolidated information [Abstract]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net					(116)
Goodwill					316
Payments to Acquire Businesses, Gross			200
iSOFT Group Limited [Member] | Customer Relationships [Member]
Business Acquisition [Line Items]
Intangible assets			92
Assets acquired and liabilities assumed [Abstract]
Estimated useful life, lower range			10 years
Estimated useful life, upper range			13 years
iSOFT Group Limited [Member] | Software
Business Acquisition [Line Items]
Intangible assets			102
Assets acquired and liabilities assumed [Abstract]
Estimated useful life, lower range			2 years
Estimated useful life, upper range			7 years
iSOFT Group Limited [Member] | Trade Names [Member]
Business Acquisition [Line Items]
Intangible assets			4
Assets acquired and liabilities assumed [Abstract]
Estimated useful life			1 year
Other Acquisition [Member]
Business Acquisition [Line Items]
Intangible assets					7
Assets acquired and liabilities assumed [Abstract]
Property and equipment					2
Current assets					8
Current liabilities					6
Estimated useful life, lower range					4 years
Estimated useful life, upper range					10 years
Fair value of accounts receivable [Abstract]
Number of acquisitions (in number of entity)					2
Unaudited pro forma summary of consolidated information [Abstract]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Contingent Liability					2
Goodwill					17
Payments to Acquire Businesses, Gross					28
Other Acquisition [Member] | GBS Segment [Member]
Unaudited pro forma summary of consolidated information [Abstract]
Goodwill					3
Other Acquisition [Member] | NPS [Member]
Fair value of accounts receivable [Abstract]
Tax deductible goodwill					14
Scenario, Previously Reported [Member]
Summary of consolidated information as reported [Abstract]
Net Income (Loss) Attributable to Parent					(616)
Fair value of accounts receivable [Abstract]
Net Income (Loss) Attributable to Parent					(616)
Level 3 [Member] | Recurring [Member] | ServiceMesh, Inc
Unaudited pro forma summary of consolidated information [Abstract]
Business Combination, Contingent Consideration, Liability										$ 137
Minimum | Trade Names [Member]
Assets acquired and liabilities assumed [Abstract]
Estimated useful life	4 years
Maximum | Trade Names [Member]
Assets acquired and liabilities assumed [Abstract]
Estimated useful life	6 years
Restricted Stock Units (RSUs) [Member] | ServiceMesh, Inc
Unaudited pro forma summary of consolidated information [Abstract]
Shares granted in acquisition							41,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period							3 years
Restricted Stock Units (RSUs) [Member] | Minimum
Unaudited pro forma summary of consolidated information [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period			3 years
Restricted Stock Units (RSUs) [Member] | Maximum
Unaudited pro forma summary of consolidated information [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period			5 years
Stock Options [Member]
Unaudited pro forma summary of consolidated information [Abstract]
Shares granted in acquisition	2,199,369		3,707,172		2,457,509

[1] The fiscal 2012 amounts include $42 million reduction of revenue and $269 million reduction in operating income as a result of the settlement of claims with the U.S. federal government (see Note 24)