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%