Investments and Derivative Instruments (Details 15) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Derivative [Line Items]
Asset Derivatives, Fair Value	$ 2,238	$ 2,732
Liability Derivatives, Fair Value	1,569	1,759
Fixed maturities, AFS [Member]
Derivative [Line Items]
Net Derivatives, Notional Amount	190	416
Net Derivatives, Fair Value	6	20
Asset Derivatives, Fair Value	0	0
Liability Derivatives, Fair Value	(6)	(20)
Other Investments [Member]
Derivative [Line Items]
Net Derivatives, Notional Amount	62,421	37,809
Net Derivatives, Fair Value	(655)	(581)
Asset Derivatives, Fair Value	1,479	1,049
Liability Derivatives, Fair Value	(824)	(468)
Other liabilities [Member]
Derivative [Line Items]
Net Derivatives, Notional Amount	38,874	67,765
Net Derivatives, Fair Value	335	(38)
Asset Derivatives, Fair Value	759	1,683
Liability Derivatives, Fair Value	(1,094)	(1,645)
Consumer Notes [Member]
Derivative [Line Items]
Net Derivatives, Notional Amount	16	26
Net Derivatives, Fair Value	2	2
Asset Derivatives, Fair Value	0	0
Liability Derivatives, Fair Value	(2)	(2)
Reinsurance Recoverables [Member]
Derivative [Line Items]
Net Derivatives, Notional Amount	45,634	47,430
Net Derivatives, Fair Value	(597)	(1,081)
Asset Derivatives, Fair Value	1,277	1,757
Liability Derivatives, Fair Value	(680)	(676)
Other policyholder funds and benefits payable [Member]
Derivative [Line Items]
Net Derivatives, Notional Amount	46,082	52,408
Net Derivatives, Fair Value	2,214	3,126
Asset Derivatives, Fair Value	0	0
Liability Derivatives, Fair Value	$ (2,214)	$ (3,126)