Investments and Derivative Instruments (Details 15) (USD $) In Millions, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Derivative [Line Items]
Net Derivatives, Notional Amount	$ 211,239	$ 196,608
Net Derivatives, Fair Value	1,495	1,044
Asset Derivatives, Fair Value	6,421	7,070
Liability Derivatives, Fair Value	(7,916)	(8,114)
Fixed maturities, AFS [Member]
Derivative [Line Items]
Net Derivatives, Notional Amount	416	416
Net Derivatives, Fair Value	31	45
Asset Derivatives, Fair Value	0	0
Liability Derivatives, Fair Value	(31)	(45)
Other Investments [Member]
Derivative [Line Items]
Net Derivatives, Notional Amount	36,900	51,231
Net Derivatives, Fair Value	(905)	(1,971)
Asset Derivatives, Fair Value	1,352	2,745
Liability Derivatives, Fair Value	(447)	(774)
Other liabilities [Member]
Derivative [Line Items]
Net Derivatives, Notional Amount	65,059	28,717
Net Derivatives, Fair Value	(126)	254
Asset Derivatives, Fair Value	2,074	981
Liability Derivatives, Fair Value	(1,948)	(1,235)
Consumer Notes [Member]
Derivative [Line Items]
Net Derivatives, Notional Amount	35	35
Net Derivatives, Fair Value	4	4
Asset Derivatives, Fair Value	0	0
Liability Derivatives, Fair Value	(4)	(4)
Reinsurance Recoverables [Member]
Derivative [Line Items]
Net Derivatives, Notional Amount	51,739	55,140
Net Derivatives, Fair Value	(2,662)	(3,073)
Asset Derivatives, Fair Value	2,995	3,344
Liability Derivatives, Fair Value	(333)	(271)
Other policyholder funds and benefits payable [Member]
Derivative [Line Items]
Net Derivatives, Notional Amount	57,090	61,069
Net Derivatives, Fair Value	5,153	5,785
Asset Derivatives, Fair Value	0	0
Liability Derivatives, Fair Value	$ (5,153)	$ (5,785)