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Stockholders' Equity - Additional Information (Detail) (USD $)
6 Months Ended
Mar. 31, 2014
Apr. 30, 2014
Subsequent Event
Stockholders' Equity Note [Line Items]    
Stock Repurchase Remaining Authorized Amount $ 3,000,000,000  
Dividends Payable, Amount Per Share (in USD per Share)   $ 0.40
Dividends, Cash $ 507,000,000