Supplemental Information (Related Party Transactions) (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Sales to and other income from related parties	$ 300	$ 225	$ 335
Trade receivables, net, from related parties	$ 55	$ 90