Segment Information (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Oct. 03, 2014	Sep. 27, 2013	Oct. 03, 2014	Sep. 27, 2013
Segment Reporting Information [Line Items]
Change in accounting policy, increase on operating income	$ 21	$ 23	$ 43	$ 46
Revenues	3,080	3,187	6,317	6,441
Operating income (1)	349	361	653	693
Depreciation and amortization	252	248	524	502
GBS
Segment Reporting Information [Line Items]
Revenues	1,003	1,022
Operating income (1)	130	120
Depreciation and amortization	40	38
GBS | As Reported
Segment Reporting Information [Line Items]
Revenues	1,003	1,022	2,091	2,076
Operating income (1)	130	120	238	233
Depreciation and amortization	40	38	79	78
GBS | Increase/ (Decrease)
Segment Reporting Information [Line Items]
Revenues	0	10	2	30
Operating income (1)	(1)	19	6	29
Depreciation and amortization	0		(1)	1
GBS | As Adjusted
Segment Reporting Information [Line Items]
Revenues	1,003	1,032	2,093	2,106
Operating income (1)	129	139	244	262
Depreciation and amortization	40	38	78	79
GIS
Segment Reporting Information [Line Items]
Revenues	1,036	1,113	2,167	2,260
Operating income (1)	68	107	139	199
Depreciation and amortization	172	169	366	343
GIS | As Reported
Segment Reporting Information [Line Items]
Revenues	1,036	1,113	2,167	2,260
Operating income (1)	68	107	139	199
Depreciation and amortization	172	169	366	343
GIS | Increase/ (Decrease)
Segment Reporting Information [Line Items]
Revenues	2		2
Operating income (1)	3	4	3	2
Depreciation and amortization	0	(1)	0	(1)
GIS | As Adjusted
Segment Reporting Information [Line Items]
Revenues	1,038	1,113	2,169	2,260
Operating income (1)	71	111	142	201
Depreciation and amortization	172	168	366	342
NPS
Segment Reporting Information [Line Items]
Revenues	1,041	1,052	2,059	2,105
Operating income (1)	160	163	311	290
Depreciation and amortization	36	37	71	74
NPS | As Reported
Segment Reporting Information [Line Items]
Revenues	1,041	1,052	2,059	2,105
Operating income (1)	160	163	311	290
Depreciation and amortization	36	37	71	74
NPS | Increase/ (Decrease)
Segment Reporting Information [Line Items]
Revenues	(7)	1	5	(7)
Operating income (1)	(1)	(2)	(5)	(1)
Depreciation and amortization	0		0
NPS | As Adjusted
Segment Reporting Information [Line Items]
Revenues	1,034	1,053	2,064	2,098
Operating income (1)	159	161	306	289
Depreciation and amortization	36	37	71	74
Corporate
Segment Reporting Information [Line Items]
Revenues	0	0	0	0
Operating income (1)	(9)	(29)	(35)	(29)
Depreciation and amortization	4	4	8	7
Eliminations
Segment Reporting Information [Line Items]
Revenues	0	0	0	0
Operating income (1)	0	0	0	0
Depreciation and amortization	$ 0	$ 0	$ 0	$ 0