Stockholders' Equity - Additional Information (Detail) (USD $)	9 Months Ended
	Jun. 30, 2014	Jul. 24, 2014 Subsequent Event
Stockholders' Equity Note [Line Items]
Stock Repurchase Remaining Authorized Amount	$ 1,900,000,000
Dividends Payable, Amount Per Share (in USD per Share)		$ 0.40
Dividends, Cash	$ 758,000,000