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Short-Term Borrowings (Securities Sold Under Repurchase Agreements) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Short-term Debt, Other Disclosures [Abstract]
Collateralized by securities purchased under resale agreements	$ 2,026
Collateralized by investment securities	5,980
Total	$ 8,006	$ 8,572

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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