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Income Taxes - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Mar. 31, 2025 | Mar. 31, 2024 | Mar. 31, 2023
Operating Loss Carryforwards [Line Items] |  |  |
Net operating losses | $ 10 | $ 9 |
Reserves for uncertain tax positions | 142 | 115 | $ 552
Unrecognized tax benefits that would impact effective tax rate | 125 | 104 | 91
Unrecognized tax benefits that decrease deferred tax assets | 3 | 1 |
Accrued interest and penalties | 7 | 7 | 3
Income tax reserve, accrued penalties and interest | 20 | $ 13 | $ 6
Federal |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Net operating losses | 1 |  |
State |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Net operating losses | 4 |  |
Foreign |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Net operating losses | $ 5 |  |

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- Definition Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-3 + Details
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- Definition Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 217 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482663/740-10-55-217 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 15 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-15 + Details
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