XML 66 R49.htm IDEA: XBRL DOCUMENT

Bank Line of Credit (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2012
Indemnity
Bank Line of Credit
Maximum borrowing capacity under the bank revolving line of credit	$ 100
Fair value of bonds pledged as collateral on the bank revolving line of credit	112
Exchange
Bank Line of Credit
Maximum borrowing capacity under the bank revolving line of credit	300
Fair value of bonds pledged as collateral on the bank revolving line of credit	$ 328

Fair value of financial instrument held by the entity for its own account (proprietary securities) for trading or investment purposes that are carried at fair value and pledged to counterparties as collateral for financing transactions.

+ References+ Details