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Assets and Liabilities Measured at Fair Value on a Recurring Basis (Parenthetical) (Detail) (Available-for-sale Securities [Member], Fair Value, Measurements, Recurring [Member], USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Investment in Federal Home Loan Bank Stock [Member]
Investments, Fair Value Disclosure	$ 268	$ 229
Federal Reserve Bank Stock [Member]
Investments, Fair Value Disclosure	402	402
Equity Funds [Member]
Investments, Fair Value Disclosure	98	69
Equity Securities, Other [Member] \| Equity Securities, Other [Member]
Investments, Fair Value Disclosure	$ 2	$ 2

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents investment securities as of the balance sheet date which may include marketable securities, derivative financial instruments, and investments accounted for under the equity method.

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