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Closed Block (Narrative) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Closed Block [Line Items]
Closed Block Liabilities, Policyholder Dividend Obligation	$ 4,609	$ 2,243	$ 0
Reduction In Policyholder Dividends Payable Due To Deterioration Of Investment Results		98
Excess Of Actual Cumulative Earnings Over Expected Cumulative Earnings [Member]
Closed Block [Line Items]
Closed Block Liabilities, Policyholder Dividend Obligation	762	126
Accumulated Net Unrealized Investment Gains That Have Arisen Subsequent To Establishment Of Closed Block [Member]
Closed Block [Line Items]
Closed Block Liabilities, Policyholder Dividend Obligation	$ 3,847	$ 2,117

The liability as of the balance sheet date for the excess of the cumulative actual closed block earnings over the cumulative expected (actuarially determined) closed block earnings (each) for the period from the actuarial calculation date to the date of measurement. The excess will result in future dividends to closed block policyholders, unless offset by less favorable than expected future performance of the closed block. The policyholder dividend obligation, which may not have a negative balance, recognizes that a portion of earnings in certain cases will not inure to the stockholders of the insurance entity.

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