Investments and Derivative Instruments (Details 16) (Cash Flow Hedging [Member], USD $) In Millions, unless otherwise specified	3 Months Ended			9 Months Ended
	Sep. 30, 2013		Sep. 30, 2012	Sep. 30, 2013		Sep. 30, 2012
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in OCI on Derivative (Effective Portion)	$ 1		$ 20	$ (119)		$ 64
Net Realized Capital Gains (Losses) Recognized in Income on Derivative (Ineffective Portion)	0		0	(2)		0
Gain or (Loss) Reclassified from AOCI into Income (Effective Portion)	18		28	111		75
Interest Rate Swap [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in OCI on Derivative (Effective Portion)	(2)		21	(128)		82
Net Realized Capital Gains (Losses) Recognized in Income on Derivative (Ineffective Portion)	0		0	(2)		0
Interest Rate Swap [Member] | Net realized capital gains (losses) [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain or (Loss) Reclassified from AOCI into Income (Effective Portion)	0	[1]	1	66	[1]	5
Interest Rate Swap [Member] | Interest Income [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain or (Loss) Reclassified from AOCI into Income (Effective Portion)	14		26	43		77
Foreign Currency Swap [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in OCI on Derivative (Effective Portion)	3		(1)	9		(18)
Net Realized Capital Gains (Losses) Recognized in Income on Derivative (Ineffective Portion)	0		0	0		0
Foreign Currency Swap [Member] | Net realized capital gains (losses) [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain or (Loss) Reclassified from AOCI into Income (Effective Portion)	$ 4		$ 1	$ 2		$ (7)

[1] Includes $71 of net gains on cash flow hedging instruments relating to the sales of the Retirement Plans and Individual Life businesses.