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Cash and Cash Equivalents (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Cash and Cash Equivalents [Abstract]
Deposits at the Federal Reserve Bank earning interest at the Federal Funds target rate	$ 200	$ 72
Interest-earning deposits in other financial institutions	234	283
Fair value of securities purchased under agreements to resell	133	136
Fair value of securities received as collateral that have been resold or repledged	$ 0	$ 0

For banks and other depository institutions (including Federal Reserve Banks, if applicable): Interest-bearing deposits in other financial institutions for relatively short periods of time including, for example, certificates of deposits, which are presented separately from cash on the balance sheet.

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