Goodwill And Acquisition-Related Intangibles, Net (Tables)

12 Months Ended

Mar. 31, 2013

Mar. 31, 2012

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule Of Changes In The Carrying Amount Of Goodwill

The changes in the carrying amount of goodwill for the fiscal year ended March 31, 2013 are as follows (in millions):

	As of March 31, 2012			Activity		Effects of Foreign Currency Translation		As of March 31, 2013
Goodwill	$	2,086		$	3	$	—	$	2,089
Accumulated impairment	(368		)	—		—		(368		)
Total	$	1,718		$	3	$	—	$	1,721

The changes in the carrying amount of goodwill for the fiscal year ended March 31, 2012 are as follows (in millions):

	As of March 31, 2011			Activity		Effects of Foreign Currency Translation			As of March 31, 2012
Goodwill	$	1,478		$	610	$	(2	)	$	2,086
Accumulated impairment	(368		)	—		—			(368		)
Total	$	1,110		$	610	$	(2	)	$	1,718

Schedule Of Acquisition-Related Intangibles

Acquisition-related intangibles, consisted of the following (in millions):

	As of March 31, 2013							As of March 31, 2012
	Gross Carrying Amount		Accumulated Amortization			Acquisition- Related Intangibles, Net		Gross Carrying Amount		Accumulated Amortization			Acquisition- Related Intangibles, Net
Developed and core technology	$	527	$	(324	)	$	203	$	518	$	(229	)	$	289
Trade names and trademarks	130		(99		)	31		131		(84		)	47
Registered user base and other intangibles	87		(84		)	3		90		(80		)	10
Carrier contracts and related	85		(73		)	12		85		(67		)	18
In-process research and development	4		—			4		5		—			5
Total	$	833	$	(580	)	$	253	$	829	$	(460	)	$	369

Schedule Of Amortization Of Intangible Assets

Amortization of intangibles and impairment charges recognized for our acquisition-related intangible assets for the fiscal years ended March 31, 2013, 2012 and 2011 are classified in the Consolidated Statement of Operations as follows (in millions):

	Year Ended March 31,
	2013		2012		2011
Cost of product	$	55	$	35	$	9
Cost of service and other	38		17		3
Operating expenses	30		43		57
Total	$	123	$	95	$	69

Schedule Of Future Amortization Of Acquisition-Related Intangibles

As of March 31, 2013, future amortization of finite-lived intangibles that will be recorded in cost of revenue and operating expenses is estimated as follows (in millions):

Fiscal Year Ending March 31,
2014	$	74
2015	66
2016	53
2017	32
2018	13
Thereafter	15
Total	$	253