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Guarantees and Contingent Liabilities (Details) (Guaranty funds, USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Guaranty funds
Guarantees and Contingent Liabilities
Liability for insurance assessments	$ 40	$ 41
Insurance assessments, premium tax offsets	$ 32	$ 34

The liability as of the balance sheet date representing required funding mandated by statute or regulatory authority that is related directly or indirectly to underwriting activities, including pools for self-insurance and excluding premium taxes and income taxes. The funds derived from the assessments generally enable a government guarantor to pay insurance claims in the event that the underwriting insurer is insolvent or otherwise unable to meet its payment obligations.

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