Segment and Geographic Information (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	12 Months Ended
	Sep. 30, 2011	Mar. 28, 2014		Mar. 29, 2013		Mar. 30, 2012
Segment Reporting Information [Line Items]
Revenues		$ 12,998		$ 14,195		$ 14,476
Operating income (loss)		1,322		878		(1,383)
Depreciation and amortization		1,018		1,070		1,141
Reconciliation of Consolidated Operating Income to Income Before Taxes [Abstract]
Operating income (loss)		1,322		878		(1,383)
Corporate G&A		(263)		(293)		(219)
Interest expense		(147)		(183)		(174)
Interest income		16		22		38
Goodwill impairment	(2,685)	0		0		(2,745)
Other income (expense), net		(18)		25		(4)
Income (loss) from continuing operations before taxes		910		449		(4,487)
NPS [Member]
Segment Reporting Information [Line Items]
Revenues		4,099	[1]	4,662	[1]	4,880	[1]
Operating income (loss)		501	[1]	490	[1]	104	[1]
Depreciation and amortization		148	[1]	158	[1]	159	[1]
Reconciliation of Consolidated Operating Income to Income Before Taxes [Abstract]
Operating income (loss)		501	[1]	490	[1]	104	[1]
NPS [Member] | Segment As Reported [Member]
Segment Reporting Information [Line Items]
Revenues		4,099		4,662		4,880
Operating income (loss)		501		490		104
Depreciation and amortization		148		158		159
Reconciliation of Consolidated Operating Income to Income Before Taxes [Abstract]
Operating income (loss)		501		490		104
NPS [Member] | Segment Out of Period Adjustments Increase (Decrease) [Member]
Segment Reporting Information [Line Items]
Revenues		0		0		5
Operating income (loss)		(4)		10		10
Depreciation and amortization		0		0		0
Reconciliation of Consolidated Operating Income to Income Before Taxes [Abstract]
Operating income (loss)		(4)		10		10
NPS [Member] | Segment Adjusted [Member]
Segment Reporting Information [Line Items]
Revenues		4,099		4,662		4,885
Operating income (loss)		497		500		114
Depreciation and amortization		148		158		159
Reconciliation of Consolidated Operating Income to Income Before Taxes [Abstract]
Operating income (loss)		497		500		114
GIS Segment [Member] | Segment As Reported [Member]
Segment Reporting Information [Line Items]
Revenues		4,613		4,743		4,840
Operating income (loss)		342		125		(142)
Depreciation and amortization		704		722		763
Reconciliation of Consolidated Operating Income to Income Before Taxes [Abstract]
Operating income (loss)		342		125		(142)
GIS Segment [Member] | Segment Out of Period Adjustments Increase (Decrease) [Member]
Segment Reporting Information [Line Items]
Revenues		(1)		2		0
Operating income (loss)		(4)		12		20
Depreciation and amortization		(1)		(3)		(1)
Reconciliation of Consolidated Operating Income to Income Before Taxes [Abstract]
Operating income (loss)		(4)		12		20
GIS Segment [Member] | Segment Adjusted [Member]
Segment Reporting Information [Line Items]
Revenues		4,612		4,745		4,840
Operating income (loss)		338		137		(122)
Depreciation and amortization		703		719		762
Reconciliation of Consolidated Operating Income to Income Before Taxes [Abstract]
Operating income (loss)		338		137		(122)
Corporate [Member]
Segment Reporting Information [Line Items]
Revenues		12		13		13
Operating income (loss)		(68)		(116)		(65)
Depreciation and amortization		14		14		16
Reconciliation of Consolidated Operating Income to Income Before Taxes [Abstract]
Operating income (loss)		(68)		(116)		(65)
Eliminations [Member]
Segment Reporting Information [Line Items]
Revenues		(140)		(140)		(134)
Operating income (loss)		0		0		0
Depreciation and amortization		0		0		0
Reconciliation of Consolidated Operating Income to Income Before Taxes [Abstract]
Operating income (loss)		0		0		0
GBS Segment [Member]
Segment Reporting Information [Line Items]
Number of Operating Segments		3
Revenues		4,414	[2]	4,917	[2]	4,877	[2]
Operating income (loss)		547	[2]	379	[2]	(1,280)	[2]
Depreciation and amortization		152	[2]	176	[2]	203	[2]
Change in accounting estimate, reduction in revenue						204
Reconciliation of Consolidated Operating Income to Income Before Taxes [Abstract]
Operating income (loss)		547	[2]	379	[2]	(1,280)	[2]
GBS Segment [Member] | Segment As Reported [Member]
Segment Reporting Information [Line Items]
Revenues		4,414		4,917		4,877
Operating income (loss)		547		379		(1,280)
Depreciation and amortization		152		176		203
Reconciliation of Consolidated Operating Income to Income Before Taxes [Abstract]
Operating income (loss)		547		379		(1,280)
GBS Segment [Member] | Segment Out of Period Adjustments Increase (Decrease) [Member]
Segment Reporting Information [Line Items]
Revenues		22		(4)		46
Operating income (loss)		23		(27)		49
Depreciation and amortization		(1)		1		0
Reconciliation of Consolidated Operating Income to Income Before Taxes [Abstract]
Operating income (loss)		23		(27)		49
GBS Segment [Member] | Segment Adjusted [Member]
Segment Reporting Information [Line Items]
Revenues		4,436		4,913		4,923
Operating income (loss)		570		352		(1,231)
Depreciation and amortization		151		177		203
Reconciliation of Consolidated Operating Income to Income Before Taxes [Abstract]
Operating income (loss)		570		352		(1,231)
Contracts Accounted for under Percentage of Completion, U.S. Claims [Member] | NPS [Member]
Segment Reporting Information [Line Items]
Change in accounting estimate, reduction in revenue						42
Change in accounting estimate, reduction in operating income						269
Contracts Accounted for under Percentage of Completion, U.K. Contract [Member] | GBS Segment [Member]
Segment Reporting Information [Line Items]
Change in accounting estimate, reduction in operating income						$ 1,485

[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 22)

[2] The fiscal 2012 amounts include $204 million reduction of revenue and $1,485 million reduction of operating income as a result of the charge associated with the NHS contract (see Note 21).