Goodwill and Other Intangible Assets (Details) (USD $)	3 Months Ended			9 Months Ended
	Dec. 30, 2011	Sep. 30, 2011	Dec. 31, 2010	Dec. 30, 2011	Dec. 31, 2010	Apr. 01, 2011
Changes in the carrying amount of goodwill by segment [Roll Forward]
Goodwill gross, beginning of period				$ 4,057,000,000
Accumulated impairment losses, beginning of period				(19,000,000)
Balance, beginning of period, net				4,038,000,000
Additions				455,000,000
Foreign currency translation				(30,000,000)
Other reclassifications				0
Goodwill impairment losses	(60,000,000)	(2,685,000,000)	0	(2,745,000,000)	0
Goodwill gross, end of period	4,482,000,000			4,482,000,000
Accumulated impairment losses, end of period	(2,764,000,000)			(2,764,000,000)
Balance, end of period, net	1,718,000,000			1,718,000,000
Goodwill impairment test [Abstract]
Number of reporting units with goodwill impairment		3
Number of reporting units to which goodwill has been assigned for impairment testing		8
Goodwill impairment loss for the annual and second quarter tests		2,682,000,000
Summary of amortizable intangible assets [Abstract]
Gross Carrying Value	4,563,000,000			4,563,000,000		4,260,000,000
Accumulated Amortization	3,033,000,000			3,033,000,000		2,880,000,000
Net	1,530,000,000			1,530,000,000		1,380,000,000
Amortization expense	112,000,000		111,000,000	334,000,000	326,000,000
Estimated amortization expense related to intangible assets [Abstract]
Estimated amortization of intangible assets for the current fiscal year	114,000,000			114,000,000
Estimated amortization expense to be recognized 1 year after the fiscal year-end balance sheet date	380,000,000			380,000,000
Estimated amortization expense to be recognized 2 years after the fiscal year-end balance sheet date	302,000,000			302,000,000
Estimated amortization expense to be recognized 3 years after the fiscal year-end balance sheet date	246,000,000			246,000,000
Estimated amortization expense to be recognized 4 years after the fiscal year-end balance sheet date	161,000,000			161,000,000
Outsourcing contract costs [Member]
Summary of amortizable intangible assets [Abstract]
Gross Carrying Value	1,966,000,000			1,966,000,000		1,971,000,000
Accumulated Amortization	1,364,000,000			1,364,000,000		1,324,000,000
Net	602,000,000			602,000,000		647,000,000
Amortization expense	12,000,000		17,000,000	37,000,000	51,000,000
Software [Member]
Summary of amortizable intangible assets [Abstract]
Gross Carrying Value	2,041,000,000			2,041,000,000		1,853,000,000
Accumulated Amortization	1,375,000,000			1,375,000,000		1,291,000,000
Net	666,000,000			666,000,000		562,000,000
Software [Member] | Internal-use software [Member]
Summary of amortizable intangible assets [Abstract]
Amortization expense	42,000,000		42,000,000	149,000,000	130,000,000
Customer and other intangible assets [Member]
Summary of amortizable intangible assets [Abstract]
Gross Carrying Value	556,000,000			556,000,000		436,000,000
Accumulated Amortization	294,000,000			294,000,000		265,000,000
Net	262,000,000			262,000,000		171,000,000
Fiscal 2012 Acquisitions [Member]
Description of changes in goodwill [Abstract]
Goodwill related to business acquisitions				454,000,000
NPS [Member]
Changes in the carrying amount of goodwill by segment [Roll Forward]
Goodwill gross, beginning of period				753,000,000
Accumulated impairment losses, beginning of period				0
Balance, beginning of period, net				753,000,000
Additions				15,000,000
Foreign currency translation				0
Other reclassifications				0
Goodwill impairment losses				0
Goodwill gross, end of period	768,000,000			768,000,000
Accumulated impairment losses, end of period	0			0
Balance, end of period, net	768,000,000			768,000,000
Description of changes in goodwill [Abstract]
Goodwill related to contingent consideration paid on achievement of agreed revenue targets				1,000,000
MSS [Member]
Changes in the carrying amount of goodwill by segment [Roll Forward]
Goodwill gross, beginning of period				1,965,000,000
Accumulated impairment losses, beginning of period				0
Balance, beginning of period, net				1,965,000,000
Additions				149,000,000
Foreign currency translation				(5,000,000)
Other reclassifications				96,000,000
Goodwill impairment losses				(2,074,000,000)
Goodwill gross, end of period	2,205,000,000			2,205,000,000
Accumulated impairment losses, end of period	(2,074,000,000)			(2,074,000,000)
Balance, end of period, net	131,000,000	143,000,000		131,000,000
Goodwill impairment test [Abstract]
Number of reporting units with goodwill impairment		1
Unrecognized intangible assets	1,300,000,000			1,300,000,000
BSS [Member]
Changes in the carrying amount of goodwill by segment [Roll Forward]
Goodwill gross, beginning of period				1,339,000,000
Accumulated impairment losses, beginning of period				(19,000,000)
Balance, beginning of period, net				1,320,000,000
Additions				291,000,000
Foreign currency translation				(25,000,000)
Other reclassifications				(96,000,000)
Goodwill impairment losses				(671,000,000)
Goodwill gross, end of period	1,509,000,000			1,509,000,000
Accumulated impairment losses, end of period	(690,000,000)			(690,000,000)
Balance, end of period, net	819,000,000			819,000,000
Goodwill impairment test [Abstract]
Number of reporting units with goodwill impairment		2
BSS [Member] | GBS Reporting Unit [Member]
Changes in the carrying amount of goodwill by segment [Roll Forward]
Goodwill impairment losses				(453,000,000)
Balance, end of period, net	0			0
BSS [Member] | Health Reporting Unit [Member]
Changes in the carrying amount of goodwill by segment [Roll Forward]
Balance, beginning of period, net	60,000,000
Goodwill impairment losses	(63,000,000)	(158,000,000)
Balance, end of period, net	0	60,000,000		0
Goodwill impairment test [Abstract]
Percentage of fair value in excess of carrying value (in hundredths)		6.00%
Goodwill allocated to reporting unit from acquisition	18,000,000			18,000,000
Adjustment to the amount of goodwill impairment charge	3,000,000
BSS [Member] | iSOFT [Member]
Goodwill impairment test [Abstract]
Goodwill allocated to reporting unit from acquisition		$ 240,000,000