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Closed Block (Details 1) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Closed block policyholder dividend obligation
Balance at January 1,	$ 2,919	$ 876	$ 0
Change in unrealized investment and derivative gains (losses)	909	2,043	876
Balance at December 31,	$ 3,828	$ 2,919	$ 876

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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