Income Taxes - Components of Income from Continuing Operations Before Income Taxes (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Income Tax Disclosure [Abstract]
Domestic, including Puerto Rico	$ 336	$ 358	$ 496
Foreign	1,669	1,304	1,287
Income from Continuing Operations Before Income Taxes	$ 2,005	$ 1,662	$ 1,783