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Repurchase Arrangements And Similar Borrowings, Including Related Hedging Activity (Schedule Of Average Borrowing Outstanding) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Jun. 30, 2011	Dec. 31, 2010
Secured Debt Outstanding	$ 10,437,387	$ 7,792,743
Average Borrowings And Rates For The Indicated Quarters, Adjusted For The Effects Of Related Derivatives Held As Cash Flow Hedges [Member]
Secured Debt Outstanding	$ 9,801,641	$ 7,468,614
Average Rate	0.55%	0.62%

The carrying value as of the balance sheet date of securities that an institution sells and agrees to repurchase (the identical or substantially the same securities) as a seller-borrower at a specified date for a specified price, also known as a repurchase agreement, or repo. Most repos involve obligations of the federal government or its agencies, but other financial instruments, such as commercial paper, banker's acceptances, and negotiable certificates of deposit, are sometimes used in repos.

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