Investments and Derivative Instruments (Details 15) (USD $) In Millions, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Derivative [Line Items]
Net Derivatives, Notional Amount	$ 151,155	$ 141,436
Net Derivatives, Fair Value	(1,045)	(458)
Asset Derivatives, Fair Value	3,102	4,682
Liability Derivatives, Fair Value	(4,147)	(5,140)
Fixed maturities, AFS [Member]
Derivative [Line Items]
Net Derivatives, Notional Amount	703	703
Net Derivatives, Fair Value	(43)	(72)
Asset Derivatives, Fair Value	0
Liability Derivatives, Fair Value	(43)	(72)
Other Investments [Member]
Derivative [Line Items]
Net Derivatives, Notional Amount	50,201	60,227
Net Derivatives, Fair Value	1,193	2,331
Asset Derivatives, Fair Value	1,748	3,165
Liability Derivatives, Fair Value	(555)	(834)
Other liabilities [Member]
Derivative [Line Items]
Net Derivatives, Notional Amount	57,368	35,944
Net Derivatives, Fair Value	(768)	(538)
Asset Derivatives, Fair Value	1,046	1,074
Liability Derivatives, Fair Value	(1,814)	(1,612)
Reinsurance Recoverables [Member]
Derivative [Line Items]
Net Derivatives, Notional Amount	6,872	7,193
Net Derivatives, Fair Value	308	443
Asset Derivatives, Fair Value	308	443
Liability Derivatives, Fair Value	0
Other policyholder funds and benefits payable [Member]
Derivative [Line Items]
Net Derivatives, Notional Amount	35,976	37,334
Net Derivatives, Fair Value	(1,731)	(2,618)
Asset Derivatives, Fair Value	0
Liability Derivatives, Fair Value	(1,731)	(2,618)
Consumer Notes [Member]
Derivative [Line Items]
Net Derivatives, Notional Amount	35	35
Net Derivatives, Fair Value	(4)	(4)
Asset Derivatives, Fair Value	0
Liability Derivatives, Fair Value	$ (4)	$ (4)