Consolidated Balance Sheets (Parenthetical) (USD $) In Millions, except Share data, unless otherwise specified	Jun. 30, 2014	Sep. 30, 2013
Statement Of Financial Position [Abstract]
Accounts and notes receivable, reserve for doubtful accounts	$ 8	$ 8
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	64,832,912	64,223,985
Common stock, Outstanding shares	64,580,371	63,970,502
Common treasury stock, shares	252,541	253,483