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Goodwill And Acquisition-Related Intangibles, Net (Tables)
 12 Months Ended
Mar. 31, 2017
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, 2017 are as follows (in millions):
 
As of
March 31, 2016
 
Effects of Foreign Currency Translation
 
As of
March 31, 2017
Goodwill
$
2,078

 
$
(3
)
 
$
2,075

Accumulated impairment
(368
)
 
—

 
(368
)
Total
$
1,710

 
$
(3
)
 
$
1,707


The changes in the carrying amount of goodwill for the fiscal year ended March 31, 2016 are as follows (in millions):
 
As of
March 31, 2015
 
Effects of Foreign Currency Translation
 
As of
March 31, 2016
Goodwill
$
2,081

 
$
(3
)
 
$
2,078

Accumulated impairment
(368
)
 
—

 
(368
)
Total
$
1,713

 
$
(3
)
 
$
1,710
Schedule Of Acquisition-Related Intangibles
Acquisition-related intangibles, consisted of the following (in millions): 
 
As of March 31, 2017
 
As of March 31, 2016
 
Gross
Carrying
Amount
 
Accumulated
Amortization
 
Acquisition-
Related
Intangibles, Net
 
Gross
Carrying
Amount
 
Accumulated
Amortization
 
Acquisition-
Related
Intangibles, Net
Developed and core technology
$
412

 
$
(412
)
 
$
—

 
$
412

 
$
(368
)
 
$
44

Trade names and trademarks
106

 
(98
)
 
8

 
106

 
(93
)
 
13

Registered user base and other intangibles
5

 
(5
)
 
—

 
5

 
(5
)
 
—

Carrier contracts and related
85

 
(85
)
 
—

 
85

 
(85
)
 
—

Total
$
608

 
$
(600
)
 
$
8

 
$
608

 
$
(551
)
 
$
57
Schedule Of Amortization Of Intangible Assets
Amortization of intangibles for the fiscal years ended March 31, 2017, 2016 and 2015 are classified in the Consolidated Statement of Operations as follows (in millions): 
 
Year Ended March 31,
 
2017
 
2016
 
2015
Cost of service and other
$
16

 
$
33

 
$
36

Cost of product
27

 
14

 
16

Operating expenses
6

 
7

 
14

Total
$
49

 
$
54

 
$
66
Schedule Of Future Amortization Of Acquisition-Related Intangibles
As of March 31, 2017, 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,
 
2018
6

2019
2

Total
$
8