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Closed Block (Policyholder Dividend Obligation) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2013	Dec. 31, 2012
Closed block policyholder dividend obligation
Balance beginning of period	$ 3,828	$ 2,919
Change in unrealized investment and derivative gains (losses)	(229)	909
Balance end of period	$ 3,599	$ 3,828

Carrying value as of the balance sheet date of the excess of the cumulative actual closed block earnings over the cumulative expected (actuarially determined) closed block earnings 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.

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- Definition

Net increase or decrease in the period in the fair market value of investments that were allocated to the closed block.

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