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Reinsurance - Earned Consolidated Property Casualty Insurance Premiums on Assumed and Ceded Business (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Reinsurance Disclosures [Abstract]
Direct earned premiums	$ 935	$ 839
Assumed earned premiums	2	3
Ceded earned premiums	(48)	(44)
Net earned premiums	$ 889	$ 798

- 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