Segment and Geographic Information 2 (Details) - USD ($) $ in Millions		12 Months Ended
		Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Information about Company by geographic area
Total revenue		$ 4,036	$ 4,025	$ 4,262
Property and equipment, net		237	242	252
Total assets		12,610	11,204	10,973
Total liabilities		6,921	5,826	5,348
From Unaffiliated Customers
Information about Company by geographic area
Total revenue		4,036	4,025	4,262
Between Geographic Areas
Information about Company by geographic area
Total revenue		0	0	0
United States
Information about Company by geographic area
Total revenue		3,005	2,985	3,053
Property and equipment, net		105	109	112
Total assets		9,018	8,185	8,122
Total liabilities		5,502	4,646	4,041
United States | From Unaffiliated Customers
Information about Company by geographic area
Total revenue		2,586	2,585	2,615
United States | Between Geographic Areas
Information about Company by geographic area
Total revenue	[1]	419	400	438
EMEA
Information about Company by geographic area
Total revenue	[2]	887	903	1,008
Property and equipment, net	[2]	93	96	97
Total assets	[2]	2,736	2,170	1,874
Total liabilities	[2]	934	728	809
EMEA | From Unaffiliated Customers
Information about Company by geographic area
Total revenue	[2]	887	903	1,008
EMEA | Between Geographic Areas
Information about Company by geographic area
Total revenue	[2]	0	0	0
Other
Information about Company by geographic area
Total revenue		563	537	639
Property and equipment, net		39	37	43
Total assets		856	849	977
Total liabilities		485	452	498
Other | From Unaffiliated Customers
Information about Company by geographic area
Total revenue		563	537	639
Other | Between Geographic Areas
Information about Company by geographic area
Total revenue		0	0	0
Eliminations
Information about Company by geographic area
Total revenue		(419)	(400)	(438)
Property and equipment, net		0	0	0
Total assets		0	0	0
Total liabilities		0	0	0
Eliminations | From Unaffiliated Customers
Information about Company by geographic area
Total revenue		0	0	0
Eliminations | Between Geographic Areas
Information about Company by geographic area
Total revenue	[1]	$ (419)	$ (400)	$ (438)

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

[2] Consists of Europe, the Middle East and Africa.