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Securities Available for Sale (Parenthetical) (Detail) (Equity Securities, Other [Member], USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]
Federal Home Loan Bank (FHLB) of Atlanta stock (par value)	$ 268	$ 229
Federal Reserve Bank Stock	402	402
Mutual fund investments (par value)	98	69
Fair Value, Measurements, Recurring [Member] \| Equity Securities, Other [Member] \| Available-for-sale Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
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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