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Transactions with Affliated Parties - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Related Party Transaction [Line Items]
Earned premiums	$ 3,194	$ 3,082	$ 3,054
Affiliated parties
Related Party Transaction [Line Items]
Payment for commissions	6	6	6
Earned premiums	$ 34	$ 36	$ 36

- Definition

Premiums earned on the income statement for all insurance and reinsurance contracts after subtracting any amounts ceded to another insurer and adding premiums assumed from other insurers.

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