Investments (Details 8) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Fair value
Fixed income securities	$ 44,223	$ 44,876
Equity securities	379	345
Short-term investments	1,343	875
Derivative instruments	(14)	(17)
Gross unrealized Gains
Fixed income securities	3,852	4,108
Equity securities	68	36
Derivative instruments	3	2
Gross unrealized Losses
Fixed income securities	(321)	(426)
Equity securities	(1)	(1)
Derivative instruments	(17)	(19)
Unrealized net gains (losses)
Fixed income securities	3,531	3,682
Equity securities	67	35
Derivative instruments	(14)	(17)
EMA limited partnerships		1
Unrealized net capital gains and losses, pre-tax	3,584	3,701
Amount recognized for:
Insurance reserves	(623)	(771)
DAC and DSI	(400)	(408)
Amounts recognized	(1,023)	(1,179)
Deferred income taxes	(901)	(888)
Total unrealized net capital gains and losses	1,660	1,634
Fair value of derivative securities classified as assets, with unrealized net gains (losses) in AOCI	3	2
Fair value of derivative securities classified as liabilities, with unrealized net gains (losses) in AOCI	$ 17	$ 19

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Accumulated adjustment to deferred income taxes related to unrealized capital gains and losses, as of the balance sheet date.

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Deferred Policy Acquisition Costs and Deferred Sales Inducement Costs adjustment included in accumulated other comprehensive income (loss) which represents the amount by which the amortization of DAC and DSI would increase or decrease if the unrealized gains or losses in the respective product portfolios were realized.

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Insurance reserve adjustment included in accumulated other comprehensive income (loss) which represents the amount by which the reserve balance would increase if the net unrealized gains in the applicable product portfolios were realized and reinvested at current lower interest rates, resulting in a premium deficiency.

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