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Reserves in Addition to Account Balance, Based on Expected No-Lapse Guarantee Benefits and Expected Policy Assessments (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Liability for Future Policy Benefit, by Product Segment [Line Items]
Life policy reserves	$ 2,285	$ 2,214
Ordinary/Traditional Life
Liability for Future Policy Benefit, by Product Segment [Line Items]
Life policy reserves	736	691
Universal Life
Liability for Future Policy Benefit, by Product Segment [Line Items]
Life policy reserves	486	481
Deferred Annuities
Liability for Future Policy Benefit, by Product Segment [Line Items]
Life policy reserves	851	827
Structured Settlements
Liability for Future Policy Benefit, by Product Segment [Line Items]
Life policy reserves	195	198
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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