Consolidated Balance Sheets (Parenthetical) (USD $) In Millions, except Share data, unless otherwise specified	Mar. 31, 2012	Sep. 30, 2011
Consolidated Balance Sheets [Abstract]
Accounts and notes receivable, reserve for doubtful accounts	$ 4	$ 4
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	63,653,983	63,894,443
Common stock, outstanding shares	63,399,863	63,860,777
Common treasury stock, shares	254,120	33,666