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Reserve in Addition to the Account Balance, Based on Expected No-Lapse Guarantee Benefits and Expected Policy Assessments (Detail) (USD $) In Millions	Jun. 30, 2011	Dec. 31, 2010
Liability for Future Policy Benefit, by Product Segment [Line Items]
Life policy reserves	$ 2,148	$ 2,034
Ordinary/Traditional Life
Liability for Future Policy Benefit, by Product Segment [Line Items]
Life policy reserves	657	628
Universal Life
Liability for Future Policy Benefit, by Product Segment [Line Items]
Life policy reserves	470	459
Deferred Annuities
Liability for Future Policy Benefit, by Product Segment [Line Items]
Life policy reserves	806	730
Investment Contracts
Liability for Future Policy Benefit, by Product Segment [Line Items]
Life policy reserves	198	200
Other
Liability for Future Policy Benefit, by Product Segment [Line Items]
Life policy reserves	$ 17	$ 17

The sum of the known and estimated amounts payable as of the balance sheet date to life insurance policyholders that relates to insured events which can be viewed as either (a) the present value of future benefits to be paid to or on behalf of policyholders and expenses less the present value of future net premiums payable under the insurance contracts or (b) the accumulated amount of net premiums already collected less the accumulated amount of benefits and expenses already paid to or on behalf of policyholders.

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