Acquisitions and Divestitures (Divestiture) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Dec. 28, 2012 Businesses	Dec. 30, 2011	Dec. 28, 2012	Dec. 30, 2011
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Discontinued Operation, Tax Effect of Discontinued Operation				$ 82
Cash proceeds from divestiture of businesses			958	0
Number of Divestitures in Period	2
Prepaid expenses and other current assets [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Assets Held-for-sale, at Carrying Value	37		37
Other Assets [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Assets Held-for-sale, at Carrying Value	1		1
Accrued expenses and other liabilities [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Liabilities of Assets Held-for-sale	17		17
BSS [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Deductions	241		241
BSS [Member] | CSC Credit Services and CSC Italia [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of Divestitures in Period	2
Pre-tax gain on sale of business	699	0	699	0
Gain on disposition, net of taxes	376	2	376	1
Transaction costs	8
Disposal group current assets	102		102
Disposal group long-lived assets	5		5
Disposal group liabilities	47		47
Revenue	70	77	228	236
Income from discontinued operations, before taxes	23	21	74	69
Tax expense (benefit)	9	(7)	31	(40)
Net income from discontinued operations	14	28	43	109
Tax expense (benefit)	323	(2)	323	(1)
Income from discontinued operations, net of taxes	390	30	419	110
BSS [Member] | CSC Credit Services [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash proceeds from divestiture of businesses	1,000
Cash and cash equivalents on divested entity's books	43		43
BSS [Member] | CSC Italia [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Transaction costs paid	$ 35