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Goodwill And Acquisition-Related Intangibles, Net (Schedule Of Acquisition-Related Intangibles) (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Mar. 31, 2020
--- | --- | ---
Finite-Lived Intangible Assets |  |  |
Gross carrying amount | $ 725 | $ 725 |
Accumulated amortization | (688) | (672) |
Acquisition-related intangibles, net | 37 | 53 | [1]
Developed And Core Technology |  |  |
Finite-Lived Intangible Assets |  |  |
Gross carrying amount | 474 | 474 |
Accumulated amortization | (458) | (450) |
Acquisition-related intangibles, net | 16 | 24 |
Trade Names And Trademarks |  |  |
Finite-Lived Intangible Assets |  |  |
Gross carrying amount | 161 | 161 |
Accumulated amortization | (140) | (132) |
Acquisition-related intangibles, net | 21 | 29 |
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 |
[1] | Derived from audited Consolidated Financial Statements.

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