Income Taxes - Schedule of Pretax Earnings from Continuing Operations (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Income Tax Disclosure [Abstract]
United States	$ 1,352	$ 1,345	$ 675
Non-U.S.	1,374	1,087	1,087
Earnings from continuing operations before income taxes	$ 2,726	$ 2,432	$ 1,762