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Earned Life Insurance Premiums on Ceded Business (Detail) (Life Insurance Segment, USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Life Insurance Segment
Reinsurance [Line Items]
Direct earned premiums	$ 54	$ 50
Assumed earned premiums
Ceded earned premiums	(13)	(13)
Net earned premiums	$ 41	$ 37

- Definition

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

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- Definition

Premiums assumed and earned by another insurer as a result of reinsurance arrangements.

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- Definition

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

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