Stockholders Equity (Narrative) (Detail) (USD $) In Millions, except Share data, unless otherwise specified	9 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Sep. 30, 2007
Noncontrolling Interest [Abstract]
Repurchase authorization, shares	379	1,109,116	10,000,000
Repurchase authorization, amount		$ 36
Shares remaining available for repurchase under the current authorization	1,600,000
Cash dividends paid to common stockholders	$ 39	$ 36