Goodwill And Acquisition-Related Intangibles, Net (Schedule Of Acquisition-Related Intangibles) (Details) - USD ($)
$ in Millions |
Sep. 30, 2016 |
Mar. 31, 2016 |
| Finite-Lived Intangible Assets |
|
|
|
| Gross carrying amount |
$ 608
|
$ 608
|
|
| Accumulated amortization |
(580)
|
(551)
|
|
| Acquisition-related intangibles, net |
28
|
57
|
[1] |
| Developed And Core Technology |
|
|
|
| Finite-Lived Intangible Assets |
|
|
|
| Gross carrying amount |
412
|
412
|
|
| Accumulated amortization |
(395)
|
(368)
|
|
| Acquisition-related intangibles, net |
17
|
44
|
|
| Trade Names And Trademarks |
|
|
|
| Finite-Lived Intangible Assets |
|
|
|
| Gross carrying amount |
106
|
106
|
|
| Accumulated amortization |
(95)
|
(93)
|
|
| Acquisition-related intangibles, net |
11
|
13
|
|
| Registered User Base And Other Intangibles |
|
|
|
| Finite-Lived Intangible Assets |
|
|
|
| Gross carrying amount |
5
|
5
|
|
| Accumulated amortization |
(5)
|
(5)
|
|
| Acquisition-related intangibles, net |
0
|
0
|
|
| Carrier Contracts And Related |
|
|
|
| Finite-Lived Intangible Assets |
|
|
|
| Gross carrying amount |
85
|
85
|
|
| Accumulated amortization |
(85)
|
(85)
|
|
| Acquisition-related intangibles, net |
$ 0
|
$ 0
|
|
|
|