Goodwill And Acquisition-Related Intangibles, Net
 12 Months Ended
Mar. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill And Acquisition-Related Intangibles, Net
(7) GOODWILL AND ACQUISITION-RELATED INTANGIBLES, NET
The changes in the carrying amount of goodwill for the fiscal year ended March 31, 2015 are as follows (in millions):
 
As of
March 31, 2014
 
Activity
 
Effects of Foreign Currency Translation
 
As of
March 31, 2015
Goodwill
$
2,091

 
$
—

 
$
(10
)
 
$
2,081

Accumulated impairment
(368
)
 
—

 
—

 
(368
)
Total
$
1,723

 
$
—

 
$
(10
)
 
$
1,713


The changes in the carrying amount of goodwill for the fiscal year ended March 31, 2014 are as follows (in millions):
 
As of
March 31, 2013
 
Activity
 
Effects of Foreign Currency Translation
 
As of
March 31, 2014
Goodwill
$
2,089

 
$
5

 
$
(3
)
 
$
2,091

Accumulated impairment
(368
)
 
—

 
—

 
(368
)
Total
$
1,721

 
$
5

 
$
(3
)
 
$
1,723


Goodwill represents the excess of the purchase price over the fair value of the underlying acquired net tangible and intangible assets. Goodwill is not amortized, but rather subject to at least an annual assessment for impairment by applying a fair value-based test.
Acquisition-related intangibles, consisted of the following (in millions): 
 
As of March 31, 2015
 
As of March 31, 2014
 
Gross
Carrying
Amount
 
Accumulated
Amortization
 
Acquisition-
Related
Intangibles, Net
 
Gross
Carrying
Amount
 
Accumulated
Amortization
 
Acquisition-
Related
Intangibles, Net
Developed and core technology
$
531

 
$
(439
)
 
$
92

 
$
531

 
$
(385
)
 
$
146

Trade names and trademarks
130

 
(111
)
 
19

 
130

 
(105
)
 
25

Registered user base and other intangibles
87

 
(87
)
 
—

 
87

 
(87
)
 
—

Carrier contracts and related
85

 
(85
)
 
—

 
85

 
(79
)
 
6

Total
$
833

 
$
(722
)
 
$
111

 
$
833

 
$
(656
)
 
$
177


Amortization of intangibles for the fiscal years ended March 31, 2015, 2014 and 2013 are classified in the Consolidated Statement of Operations as follows (in millions): 
 
Year Ended March 31,
 
2015
 
2014
 
2013
Cost of product
$
16

 
$
33

 
$
55

Cost of service and other
36

 
27

 
38

Operating expenses
14

 
16

 
30

Total
$
66

 
$
76

 
$
123


Acquisition-related intangible assets are amortized using the straight-line method over the lesser of their estimated useful lives or the agreement terms, typically from 2 to 14 years. As of March 31, 2015 and 2014, the weighted-average remaining useful life for acquisition-related intangible assets was approximately 2.8 years and 3.4 years for each period, respectively.
As of March 31, 2015, future amortization of acquisition-related intangibles that will be recorded in the Consolidated Statement of Operations is estimated as follows (in millions): 
Fiscal Year Ending March 31,
 
2016
$
53

2017
32

2018
12

2019
8

2020
6

Thereafter
—

Total
$
111