Consolidated Balance Sheets (Parenthetical) (Unaudited) - USD ($) $ in Millions	Jun. 30, 2025	Sep. 30, 2024
Statement of Financial Position [Abstract]
Accounts and notes receivable, reserve for doubtful accounts	$ 5	$ 5
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	53,334,316	54,430,316
Common stock, outstanding shares	53,203,216	54,297,251
Common treasury stock, shares	131,100	133,065