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Income Taxes - Schedule of Income Tax Expense (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Income Tax Disclosure [Abstract] |  |  |  |
Income tax expense | $ 232 | $ 247 | $ 452 | $ 371
Reported income tax rate | 16.60% | 46.30% | 18.50% | 22.90%

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