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Securities Available for Sale - Additional Information (Detail) (USD $)	Sep. 30, 2011	Dec. 31, 2010	Sep. 30, 2011 Trading Assets	Dec. 31, 2010 Trading Assets	Sep. 30, 2011 Mortgage-backed Securities, Issued by Private Enterprises Other Than Temporarily Impaired Securities	Sep. 30, 2010 Mortgage-backed Securities, Issued by Private Enterprises Other Than Temporarily Impaired Securities
Schedule of Available-for-sale Securities [Line Items]
Fair value of pledged securities available for sale	$ 7,900,000,000	$ 6,900,000,000
Trading assets and cash equivalents, pledged			1,100,000,000	823,000,000
Repurchase agreements	2,016,000,000	2,180,000,000	1,000,000,000	793,000,000
Available for sale securities, fair market value					$ 176,000,000	$ 1,000,000

The carrying value as of the balance sheet date of securities that an institution sells and agrees to repurchase (the identical or substantially the same securities) as a seller-borrower at a specified date for a specified price, also known as a repurchase agreement, or repo. Most repos involve obligations of the federal government or its agencies, but other financial instruments, such as commercial paper, banker's acceptances, and negotiable certificates of deposit, are sometimes used in repos.

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