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Income Taxes (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Income Tax Footnote Disclosure [Line Items] |  |  |  |
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount | $ 6 |  | $ 7 |
Gross unrecognized tax benefits | $ 587 |  | $ 587 |
Effective Income Tax Rate Reconciliation, Percent | 10.00% | 33.00% | 21.00% | 9.00%
Decrease in Unrecognized Tax Benefits is Reasonably Possible | $ 5 |  | $ 5 |
Provision for income taxes | 32 | $ (46) | $ 136 | $ 57
Codemasters Intra-entity Sale of Intellectual Property Rights [Member] |  |  |  |
Income Tax Footnote Disclosure [Line Items] |  |  |  |
Provision for income taxes | $ 60 |  |  |
Pro Forma [Member] |  |  |  |
Income Tax Footnote Disclosure [Line Items] |  |  |  |
Effective Income Tax Rate Reconciliation, Percent |  | 13.00% |  | 20.00%
Pro Forma [Member] | Codemasters Intra-entity Sale of Intellectual Property Rights [Member] |  |  |  |
Income Tax Footnote Disclosure [Line Items] |  |  |  |
Effective Income Tax Rate Reconciliation, Percent | 28.00% |  | 31.00% |

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