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Credit Risk (Details 3) (USD $) In Millions	6 Months Ended
Credit Risk (Details 3) (USD $) In Millions	Jun. 30, 2011	Jun. 30, 2010
Summary of the activity in reinsurance-related reserves
Balance, beginning of period	$ 113	$ 108
Realized reinsurance losses	(33)	(6)
Increase in liability for reinsurance losses	17	26
Balance, end of period	$ 97	$ 128

Liability as of the balance sheet date for the estimated ultimate cost of settling claims and claim adjustment expense relating to insured events that have occurred on or before the balance sheet date for those liabilities owed to another party as a result of assuming another insurer's primary obligation.

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