Segment and Geographic Information 3 (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Mar. 31, 2013		Mar. 31, 2012		Mar. 31, 2011
Information about Company by geographic area
Revenue to unaffiliated customers	$ 4,643		$ 4,814		$ 4,429
Revenue between geographic areas (intercompany revenue)	0		0		0
Total revenue	4,643		4,814		4,429
Property and equipment, net	311		386		437
Total assets	11,811		11,997		12,411
Total liabilities	6,361		6,600		6,791
United States [Member]
Information about Company by geographic area
Revenue to unaffiliated customers	2,747		2,812		2,519
Revenue between geographic areas (intercompany revenue)	460	[1]	472	[1]	453	[1]
Total revenue	3,207		3,284		2,972
Property and equipment, net	138		181		211
Total assets	8,887		9,078		9,641
Total liabilities	4,793		4,911		4,996
Europe [Member]
Information about Company by geographic area
Revenue to unaffiliated customers	1,104		1,182		1,139
Revenue between geographic areas (intercompany revenue)	0		0		0
Total revenue	1,104		1,182		1,139
Property and equipment, net	108		121		132
Total assets	1,917		1,904		1,789
Total liabilities	944		1,009		1,163
Other [Member]
Information about Company by geographic area
Revenue to unaffiliated customers	792		820		771
Revenue between geographic areas (intercompany revenue)	0		0		0
Total revenue	792		820		771
Property and equipment, net	65		84		94
Total assets	1,007		1,015		981
Total liabilities	624		680		632
Eliminations [Member]
Information about Company by geographic area
Revenue to unaffiliated customers	0		0		0
Revenue between geographic areas (intercompany revenue elimination)	(460)	[1]	(472)	[1]	(453)	[1]
Total revenue	(460)		(472)		(453)
Property and equipment, net	0		0		0
Total assets	0		0		0
Total liabilities	$ 0		$ 0		$ 0

[1] Represents royalties from foreign subsidiaries determined as a percentage of certain amounts invoiced to customer.