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Stockholders' Equity - Additional Information (Detail) (USD $)	6 Months Ended
	Mar. 31, 2013	Jan. 30, 2013	Apr. 23, 2013 Subsequent Event
Stockholders' Equity Note [Line Items]
Stock Repurchase Remaining Authorized Amount	$ 1,000,000,000
Dividends Payable, Amount Per Share (in USD per Share)		$ 0.33	$ 0.33
Dividends, Cash	$ 437,000,000

- Definition

Equity impact of cash dividends declared by an entity during the period for all classes of stock (common, preferred, etc.). This element includes paid and unpaid dividends declared during the period.

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