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Business Changes and Developments Subsequent events (Details 1) (Parent Company, USD $) In Billions, unless otherwise specified	0 Months Ended
	May 08, 2013
Subsequent Event
Preferred Stock, Liquidation Preference, Percentage	100.00%
Subsequent Event
Subsequent Event
Payments for Repurchase of Trust Preferred Securities	5.0

The cash outflow to reacquire preferred stocks issued by a business trust or other special purpose entity, mainly established by a bank holding entity, to third party investors. The trust's assets are deeply subordinated debentures of the bank holding entity. Most trust preferred securities are subject to a mandatory redemption upon the repayment of the debentures.

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