Investments and Derivative Instruments (Details 15) (USD $) In Millions, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Derivative [Line Items]
Net Derivatives, Notional Amount	$ 181,764	$ 205,854
Net Derivatives, Fair Value	1,746	1,448
Asset Derivatives, Fair Value	2,783	4,489
Liability Derivatives, Fair Value	(4,529)	(5,937)
Fixed maturities, AFS [Member]
Derivative [Line Items]
Net Derivatives, Notional Amount	190	416
Net Derivatives, Fair Value	4	20
Asset Derivatives, Fair Value	0	0
Liability Derivatives, Fair Value	(4)	(20)
Other Investments [Member]
Derivative [Line Items]
Net Derivatives, Notional Amount	25,802	37,809
Net Derivatives, Fair Value	(320)	(581)
Asset Derivatives, Fair Value	630	1,049
Liability Derivatives, Fair Value	(310)	(468)
Other liabilities [Member]
Derivative [Line Items]
Net Derivatives, Notional Amount	75,157	67,765
Net Derivatives, Fair Value	652	(38)
Asset Derivatives, Fair Value	1,179	1,683
Liability Derivatives, Fair Value	(1,831)	(1,645)
Consumer Notes [Member]
Derivative [Line Items]
Net Derivatives, Notional Amount	9	26
Net Derivatives, Fair Value	1	2
Asset Derivatives, Fair Value	0	0
Liability Derivatives, Fair Value	(1)	(2)
Reinsurance Recoverables [Member]
Derivative [Line Items]
Net Derivatives, Notional Amount	40,212	47,430
Net Derivatives, Fair Value	(279)	(1,081)
Asset Derivatives, Fair Value	974	1,757
Liability Derivatives, Fair Value	(695)	(676)
Other policyholder funds and benefits payable [Member]
Derivative [Line Items]
Net Derivatives, Notional Amount	40,394	52,408
Net Derivatives, Fair Value	1,688	3,126
Asset Derivatives, Fair Value	0	0
Liability Derivatives, Fair Value	$ (1,688)	$ (3,126)