Consolidated Balance Sheets (Parenthetical) (USD $) In Millions, except Share data, unless otherwise specified	Jun. 30, 2013	Sep. 30, 2012
Statement Of Financial Position [Abstract]
Accounts and notes receivable, reserve for doubtful accounts	$ 8	$ 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	64,108,518	63,600,928
Common stock, outstanding shares	63,854,953	63,347,362
Common treasury stock, shares	253,565	253,565