Segment Information (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	9 Months Ended
Jan. 02, 2015	Dec. 27, 2013	Jan. 02, 2015	Dec. 27, 2013
Segment Reporting Information [Line Items]
Revenues	$ 2,947us-gaap_Revenues	$ 3,228us-gaap_Revenues	$ 9,264us-gaap_Revenues	$ 9,669us-gaap_Revenues
Operating income	332us-gaap_OperatingIncomeLoss	338us-gaap_OperatingIncomeLoss	985us-gaap_OperatingIncomeLoss	1,031us-gaap_OperatingIncomeLoss
Depreciation and amortization	238us-gaap_DepreciationAndAmortization	251us-gaap_DepreciationAndAmortization	762us-gaap_DepreciationAndAmortization	753us-gaap_DepreciationAndAmortization
GBS [Member]
Segment Reporting Information [Line Items]
Revenues	965	1,093	3,056	3,169
Operating income	128	140	366	373
Depreciation and amortization	37	34	116	112
GBS [Member] \| As Reported
Segment Reporting Information [Line Items]
Revenues	965	1,093
Operating income	128	140
Depreciation and amortization	37	34
GBS [Member] \| Increase/ (Decrease)
Segment Reporting Information [Line Items]
Revenues	(1)	(6)	3	24
Operating income	(4)	(7)	5	22
Depreciation and amortization	0	0	(1)	1
GBS [Member] \| As Adjusted
Segment Reporting Information [Line Items]
Revenues	964	1,087	3,059	3,193
Operating income	124	133	371	395
Depreciation and amortization	37	34	115	113
GIS [Member]
Segment Reporting Information [Line Items]
Revenues	984	1,145	3,151	3,405
Operating income	72	91	211	290
Depreciation and amortization	163	177	529	520
GIS [Member] \| As Reported
Segment Reporting Information [Line Items]
Revenues	984	1,145	3,151	3,405
Operating income	72	91	211	290
Depreciation and amortization	163	177	529	520
GIS [Member] \| Increase/ (Decrease)
Segment Reporting Information [Line Items]
Revenues	0	(2)	2	(2)
Operating income	0	(6)	3	(5)
Depreciation and amortization	0	0	0	(1)
GIS [Member] \| As Adjusted
Segment Reporting Information [Line Items]
Revenues	984	1,143	3,153	3,403
Operating income	72	85	214	285
Depreciation and amortization	163	177	529	519
NPS [Member]
Segment Reporting Information [Line Items]
Revenues	998	990	3,057	3,095
Operating income	145	122	456	412
Depreciation and amortization	33	36	104	110
NPS [Member] \| As Reported
Segment Reporting Information [Line Items]
Revenues	998	990	3,057	3,095
Operating income	145	122	456	412
Depreciation and amortization	33	36	104	110
NPS [Member] \| Increase/ (Decrease)
Segment Reporting Information [Line Items]
Revenues	0	2	5	(5)
Operating income	0	1	(5)	0
Depreciation and amortization	0	0	0	0
NPS [Member] \| As Adjusted
Segment Reporting Information [Line Items]
Revenues	998	992	3,062	3,090
Operating income	145	123	451	412
Depreciation and amortization	33	36	104	110
Corporate [Member]
Segment Reporting Information [Line Items]
Revenues	0	0	0	0
Operating income	(13)	(15)	(48)	(44)
Depreciation and amortization	5	4	13	11
Eliminations [Member]
Segment Reporting Information [Line Items]
Revenues	0	0	0	0
Operating income	0	0	0	0
Depreciation and amortization	$ 0	$ 0	$ 0	$ 0

The current period expense charged against earnings on long-lived, physical assets not used in production, and which are not intended for resale, to allocate or recognize the cost of such assets over their useful lives; or to record the reduction in book value of an intangible asset over the benefit period of such asset; or to reflect consumption during the period of an asset that is not used in production.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 360

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585

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- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Article 5

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