Income Taxes - Income Before Taxes by Fiscal Year (Detail) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
Income Tax Disclosure [Abstract]
U.S.	$ 11,051	$ 11,002	$ 9,178
Non-U.S.	7,085	5,061	4,612
Income before income taxes	$ 18,136	$ 16,063	$ 13,790