Other Non-Current Assets (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2012	Sep. 30, 2011
Prepaid Expenses and Other Assets [Abstract]
Other investments - (See Note 4-Fair Value Measurements and Investments)	$ 86	$ 100
Pension asset--(See Note 11--Pension, Postretirement and Other Benefits)	23	0
Long-term prepaid expenses and other	42	29
Total	$ 151	$ 129