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Securities - Additional Information (Detail) (USD $)	Sep. 30, 2012 Y MortgageLoan
Schedule of Available-for-sale Securities [Line Items]
Number of fixed rate collateralized mortgage obligations	4
Weighted-average maturity collateralized mortgage, in years	0.4
Gross unrealized losses attributable to collateralized mortgage obligations	$ 0
Pladged available for sale and Held-To-Maturity securities	$ 10,400,000,000

Carrying amount as of the balance sheet date of loans that have been pledged as collateral for borrowings. If the secured party has the right by contract or custom to sell or re-pledge the collateral, then the debtor reclassifies that asset and report that asset in its statement of financial position separately from other assets not so encumbered.

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