Income Taxes - Components of Income from Continuing Operations Before Income Taxes (Detail) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Income Tax Disclosure [Abstract]
Domestic, including Puerto Rico	$ 358	$ 496	$ 70
Foreign	1,304	1,287	1,623
Income from Continuing Operations Before Income Taxes	$ 1,662	$ 1,783	$ 1,692