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Earned Consolidated Property Casualty Insurance Premiums on Assumed and Ceded Business (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Supplemental Information for Property, Casualty Insurance Underwriters [Line Items]
Direct earned premiums	$ 839	$ 780
Assumed earned premiums	3	5
Ceded earned premiums	(44)	(40)
Net earned premiums	$ 798	$ 745

- Definition

Premiums assumed and earned for all property and casualty insurance assumed from other insurers as a result of reinsurance arrangements.

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- Definition

Premiums recognized as revenue in the period earned on all property and casualty insurance and reinsurance contracts after subtracting any amounts ceded to another insurer.

+ References+ Details