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v3.25.1

Income Taxes - Effective Tax Rate Reconciliation, Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
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Mar. 31, 2025 | Mar. 31, 2024 | Mar. 31, 2023
Income Tax Disclosure [Abstract] |  |  |
Effective income tax rate reconciliation, foreign tax rate differential, amount | $ 145 |  |
Effective income tax rate reconciliation, foreign tax rate differential, percent | 23.00% | (152.30%) | 2.30%
Effective income tax rate reconciliation, tax credits, amount | $ 84 | $ 101 | $ 71
Effective income tax rate reconciliation, tax credits, percent | 13.30% | 92.70% | (8.00%)
Effective income tax rate reconciliation, U.S. tax on foreign income, amount | $ 59 | $ 39 | $ 51
Effective income tax rate reconciliation, U.S. tax on foreign income, percent | 9.40% | 35.80% | (5.80%)
Effective income tax rate reconciliation, uncertain tax positions, amount | $ 52 |  |
Change in uncertain tax positions | (8.30%) | 0.00% | (1.20%)
Effective income tax rate reconciliation, loss on investments, amount |  | $ 160 |
Effective income tax rate reconciliation, loss on investments, percent |  | 146.80% |
Effective income tax rate reconciliation, withholding taxes, amount |  | $ 64 |
Effective income tax rate reconciliation, withholding taxes, percent | 2.10% | 58.70% | (3.50%)
Effective income tax rate reconciliation, remeasurement of deferred tax assets and liabilities, amount |  |  | $ (81)
Effective income tax rate reconciliation, remeasurement of deferred tax assets and liabilities, percent | 0.30% | (26.60%) | 9.10%
Effective income tax rate reconciliation, divestiture of business, amount |  |  | $ (67)
Effective income tax rate reconciliation, divestiture of business, percent | 0.20% | (5.50%) | 7.60%
Valuation allowance | $ 2,242 | $ 2,264 |
Net increase in deferred tax asset valuation allowance | $ 22 |  |

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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-2 + Details
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