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Goodwill And Acquisition-Related Intangibles, Net (Tables)
 9 Months Ended
Dec. 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 nine months ended December 31, 2017 are as follows (in millions):
 
As of
March 31, 2017
 
Activity
 
Effects of Foreign Currency Translation
 
As of
December 31, 2017
Goodwill
$
2,075

 
$
167

 
$
5

 
$
2,247

Accumulated impairment
(368
)
 
—

 
—

 
(368
)
Total
$
1,707

 
$
167

 
$
5

 
$
1,879
Schedule Of Acquisition-Related Intangibles
Acquisition-related intangibles consisted of the following (in millions):
 
As of December 31, 2017
 
As of March 31, 2017
 
Gross
Carrying
Amount
 
Accumulated
Amortization
 
Acquisition-
Related
Intangibles, Net
 
Gross
Carrying
Amount
 
Accumulated
Amortization
 
Acquisition-
Related
Intangibles, Net
Developed and core technology
$
419

 
$
(412
)
 
$
7

 
$
412

 
$
(412
)
 
$
—

Trade names and trademarks
153

 
(103
)
 
50

 
106

 
(98
)
 
8

Registered user base and other intangibles
5

 
(5
)
 
—

 
5

 
(5
)
 
—

Carrier contracts and related
85

 
(85
)
 
—

 
85

 
(85
)
 
—

In-process research and development
24

 
—

 
24

 
—

 
—

 
—

Total
$
686

 
$
(605
)
 
$
81

 
$
608

 
$
(600
)
 
$
8
Schedule Of Amoritization Of Intangibles
Amortization of intangibles for the three and nine months ended December 31, 2017 and 2016 are classified in the Condensed Consolidated Statement of Operations as follows (in millions):
 
Three Months Ended
December 31,
 
Nine Months Ended
December 31,
 
2017
 
2016
 
2017
 
2016
Cost of service and other
$
—

 
$
—

 
$
—

 
$
16

Cost of product
1

 
18

 
1

 
27

Operating expenses
1

 
2

 
4

 
5

Total
$
2

 
$
20

 
$
5

 
$
48
Schedule Of Future Amortization Of Acquisition-Related Intangibles
As of December 31, 2017, future amortization of acquisition-related intangibles that will be recorded in the Condensed Consolidated Statement of Operations is estimated as follows (in millions): 
Fiscal Year Ending March 31,
 
2018 (remaining three months)
$
5

2019
13

2020
6

2021
6

2022
6

2023
6

Thereafter
15

Total
$
57