Debt and Financing Arrangements - Schedule of Net Financing Charges (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Debt Disclosure [Abstract]
Interest expense, net of capitalized interest costs	$ 46	$ 59
Banking fees and debt issuance cost amortization	3	3
Interest income	(2)	(2)
Derivative loss on Yanfeng transaction	3	0
Net foreign exchange	0	(1)
Net financing charges	$ 50	$ 59