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Schedule IV (Reinsurance) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Schedule IV - Reinsurance [Abstract]
Direct Amount	$ (5)	$ (19)	$ (3)
Ceded to Other Value	3	(229)	(93)
Assumed from Other Companies	(2)	7	(62)
Net Amount	$ (10)	$ 217	$ 28
Percentage of Amount Assumed to Net	20.00%	3.00%	(221.00%)

- Definition

Premiums assumed for all financial guarantee insurance contracts assumed from other insurers as a result of reinsurance arrangements.

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- Definition

Premiums assumed for all financial guarantee insurance contracts by another insurer as a result of reinsurance arrangements.

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- Definition

Premiums written directly by insurer for all financial guarantee insurance contracts before adding contracts assumed from other insurers or subtracting any amounts assumed by other insurers.

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- Definition

Premiums written for all financial guarantee insurance contracts and reinsurance contracts after subtracting any amounts ceded to another insurer.

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