Debt and Financing Arrangements - Components of Net Financing Charges (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2023	Mar. 31, 2022
Debt Disclosure [Abstract]
Interest expense, net of capitalized interest costs	$ 71	$ 56	$ 140	$ 111
Other financing charges	11	5	21	10
Interest income	(3)	(1)	(7)	(3)
Net foreign exchange results for financing activities	(8)	(9)	(16)	(14)
Net financing charges	$ 71	$ 51	$ 138	$ 104