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Contingencies and Guarantees (Details) (Future guaranty fund assessments, USD $) In Millions, unless otherwise specified	6 Months Ended	12 Months Ended
	Jun. 30, 2013	Dec. 31, 2012
Future guaranty fund assessments
Commitments and Contingencies
Liability related to guaranty fund assessments	$ 22	$ 26
Premium tax asset	$ 17	$ 19

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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