Income Taxes - Components of Provision for Income Taxes on Continuing Operations (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Components of income (loss) from continuing operations before income taxes:
U.S.	$ (130)	$ 67	$ 543
Non-U.S.	1,840	1,643	2,071
Income from continuing operations before income taxes	1,710	1,710	2,614
Current
U.S. federal	(165)	(219)	459
U.S. state	105	53	108
Non-U.S.	413	294	265
Total	353	128	832
Deferred
U.S. federal	(267)	(175)	(7)
U.S. state	(25)	(69)	46
Non-U.S.	(384)	103	(3)
Total	(676)	(141)	36
Income tax provision (benefit)	(323)	(13)	868
Income taxes paid	$ 430	$ 568	$ 504