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Reinsurance (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Funds held under reinsurance agreements, liability	$ 3,700	$ 3,600
Reinsurance recoveries reported in insurance claims and policyholders' benefits reported on the Consolidated Statement of Operations	1,514	1,285	1,121
Ceded claim and claim adjustment expense reserves, future policy benefits and policyholder funds as the result of business operations sold in prior years	1,131	1,211
Subsidiaries of Berkshire Hathaway Group [Member]
Ceded credit risk, claims receivable	2,700
Subsidiaries of Swiss Re Group [Member]
Ceded credit risk, claims receivable	900
Subsidiaries of Hartford Insurance Group [Member]
Ceded credit risk, claims receivable	350
Significant Captive Program [Member]
Direct and ceded earned premiums	1,794	1,500	1,383
Reinsurance recoveries reported in insurance claims and policyholders' benefits reported on the Consolidated Statement of Operations	$ 814	$ 790	$ 735

Amount of reported and estimated unreported claims assumed by and receivable from the identified reinsurer with respect to disclosure of a concentration of credit risk.

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- Definition

Funds held by the ceding insurer on behalf the reinsurer, including funds held in trust, under reinsurance treaties or contracts with the assuming insurer as security for the payment of the obligations thereunder, which represent a liability of the ceding insurer. There is another concept for the corresponding asset of the reinsurer.

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