Fair Value Of Financial Instruments (Carrying Amounts And Fair Values Of Company's Financial Instruments) (Details) (USD $) In Millions	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2009	Sep. 30, 2008
Cash and cash equivalents, Carrying Amount	$ 286	$ 387	$ 304	$ 129
Cash and cash equivalents, Fair Value	286	387
Accounts and notes receivable, Carrying Amount	659	540
Accounts and notes receivable, Fair Value	659	540
Derivative instruments, Carrying Amount	1	2
Derivative instruments, Fair Value	1	2
Notes payable to banks, Carrying Amount	86	29
Notes payable to banks, Fair Value	86	29
Accounts payable and accrued liabilities, Carrying Amount	461	431
Accounts payable and accrued liabilities, Fair Value	461	431
Long-term debt, Carrying Amount	613	623
Capital lease obligations, Carrying Amount	15	3
Capital lease obligations, Fair Value	15	3
Derivative instruments, Carrying Amount	39	39
Derivative instruments, Fair Value	39	39
Fixed Rate [Member]
Long-term debt, Carrying Amount	585	604
Long-term debt, Fair Value	633	661
Floating Rate [Member]
Long-term debt, Carrying Amount	15	16
Long-term debt, Fair Value	$ 15	$ 16