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Property Casualty Loss And Loss Expenses - Additional Information (Detail) (Property, Liability and Casualty Insurance Segment, USD $) In Millions	Jun. 30, 2011	Jun. 30, 2010
Property, Liability and Casualty Insurance Segment
Supplemental Information for Property, Casualty Insurance Underwriters [Line Items]
Reserve for loss and loss expenses, life and health loss and loss expense reserves	$ 56	$ 53

Alternate concept name for the aggregate amount of policy reserves (provided for future obligations including unpaid claims and claims adjustment expenses) and policy benefits (liability for future policy benefits) as of the balance sheet date; grouped amount of all the liabilities associated with the company's insurance policies.

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