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Investment Securities (Details Textual) (USD $) In Billions, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011	Mar. 31, 2011
Investment Securities
Other investment securities pledged	$ 1.9	$ 1.9	$ 2.2
Corporate Debt Securities [Member]
Investment Securities
Number of single issuer trust preferred securities with stated maturities	8
Percentage of investment that of fair value of investment portfolio	2.00%

Sum of the carrying amounts as of the date of the latest financial statement presented of securities which are owned but transferred to another party to serve as collateral to partially or fully secure a debt obligation, repurchase agreement or other current or potential obligation, and for which the transferee is not permitted to sell or re-pledge them to an unrelated party.

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