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Collateralized Transactions (Details) (Non Variable Interest Entities [Member], USD $)	Dec. 31, 2011	Dec. 31, 2010
Non Variable Interest Entities [Member]
Fair value of financial assets pledged as collateral	$ 543,000,000	$ 552,000,000
Securities sold under agreements to repurchase	287,000,000	471,000,000
Cash collateral pledged under securities repurchase agreements	$ 0	$ 0

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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