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Closed Block (Details 1) (USD $) In Millions, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2012	Dec. 31, 2011
Closed block policyholder dividend obligation
Balance, beginning of period	$ 2,919	$ 876
Change in unrealized investment and derivative gains (losses)	(219)	2,043
Balance, end of period	$ 2,700	$ 2,919

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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