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Goodwill And Acquisition-Related Intangibles, Net (Schedule Of Acquisition-Related Intangibles) (Details) - USD ($) $ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2021 | Mar. 31, 2021
Finite-Lived Intangible Assets |  |  |
Gross carrying amount | $ 1,789 | $ 969 |
Accumulated amortization | (806) | (706) |
Acquisition-related intangibles, net | 983 | 263 |
Intangible Assets, Net (Excluding Goodwill) | 1,080 | 309 | [1]
Intangible Assets, Gross (Excluding Goodwill) [Abstract] |  |  |
Intangible Assets, Gross (Excluding Goodwill) | 1,886 | 1,015 |
Playdemic Limited [Member] |  |  |
Finite-Lived Intangible Assets |  |  |
Gross carrying amount | 354 | 0 |
Accumulated amortization | 0 | 0 |
Acquisition-related intangibles, net | $ 354 | $ 0 |
Weighted Average |  |  |
Finite-Lived Intangible Assets |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 5 years 4 months 24 days | 3 years 6 months |
Weighted Average | Glu Mobile Inc. [Member] |  |  |
Finite-Lived Intangible Assets |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 5 years 6 months |  |
Weighted Average | Playdemic Limited [Member] |  |  |
Finite-Lived Intangible Assets |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 7 years |  |
In Process Research and Development [Member] |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |
Indefinite-lived Intangible Assets (Excluding Goodwill) | $ 97 | $ 46 |
Developed And Core Technology |  |  |
Finite-Lived Intangible Assets |  |  |
Gross carrying amount | 939 | 691 |
Accumulated amortization | (542) | (472) |
Acquisition-related intangibles, net | 397 | 219 |
Trade Names And Trademarks |  |  |
Finite-Lived Intangible Assets |  |  |
Gross carrying amount | 393 | 188 |
Accumulated amortization | (169) | (144) |
Acquisition-related intangibles, net | 224 | 44 |
Registered User Base And Other Intangibles |  |  |
Finite-Lived Intangible Assets |  |  |
Gross carrying amount | 18 | 5 |
Accumulated amortization | (10) | (5) |
Acquisition-related intangibles, net | 8 | 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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