Consolidated Balance Sheets (Parenthetical) (Unaudited) - USD ($) $ in Millions	Dec. 31, 2023	Sep. 30, 2023
Statement of Financial Position [Abstract]
Accounts and notes receivable, reserve for doubtful accounts	$ 3	$ 2
Preferred stock, authorized shares	2,000,000	2,000,000
Preferred stock, par value	$ 1	$ 1
Preferred stock, Issued shares	0	0
Preferred stock, Outstanding shares	0	0
Common stock, authorized shares	200,000,000	200,000,000
Common stock, par value	$ 1	$ 1
Common stock, issued shares	55,560,648	55,379,636
Common stock, outstanding shares	55,424,816	55,243,804
Common treasury stock, shares	135,832	135,832