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Short-Term Borrowings (Securities Sold Under Repurchase Agreements) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Short-Term Borrowings [Abstract]
Collateralized by securities purchased under resale agreements	$ 5,651
Collateralized by investment securities	2,921
Total	$ 8,572	$ 7,599

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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