GOODWILL AND ACQUISITION-RELATED INTANGIBLES, NET (Schedule of Acquisition-Related Intangibles) (Details) (USD $) In Millions	Jun. 30, 2011	Mar. 31, 2011
Acquisition-Related Intangibles, Gross Carrying Amount	$ 526	$ 520
Acquisition-Related Intangibles, Accumulated Amortization	(392)	(376)
Acquisition-Related Intangibles, Net	134	144	[1]
Developed and Core Technology [Member]
Acquisition-Related Intangibles, Gross Carrying Amount	265	259
Acquisition-Related Intangibles, Accumulated Amortization	(187)	(180)
Acquisition-Related Intangibles, Net	78	79
Trade Names and Trademarks [Member]
Acquisition-Related Intangibles, Gross Carrying Amount	90	90
Acquisition-Related Intangibles, Accumulated Amortization	(73)	(70)
Acquisition-Related Intangibles, Net	17	20
Registered User Base and Other Intangibles [Member]
Acquisition-Related Intangibles, Gross Carrying Amount	86	86
Acquisition-Related Intangibles, Accumulated Amortization	(69)	(64)
Acquisition-Related Intangibles, Net	17	22
Carrier Contracts and Related [Member]
Acquisition-Related Intangibles, Gross Carrying Amount	85	85
Acquisition-Related Intangibles, Accumulated Amortization	(63)	(62)
Acquisition-Related Intangibles, Net	$ 22	$ 23

[1] Derived from audited consolidated financial statements.