Investments and Derivative Instruments Level 4 Fair Value Hedges (Details) (Fair Value Hedging [Member], USD $) In Millions, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2014		Sep. 30, 2013		Sep. 30, 2014		Sep. 30, 2013
Derivatives, Fair Value [Line Items]
Derivative Instruments Gain (Loss) Recognized in Income on Hedged Item Net	$ (2)	[1]	$ 5	[1]	$ (1)	[1]	$ (8)	[1]
Gain (Loss) on Fair Value Hedge Ineffectiveness, Net	2	[1]	(3)	[1]	0	[1]	5	[1]
Gain (Loss) on Investments [Member] | Interest Rate Swap [Member]
Derivatives, Fair Value [Line Items]
Derivative Instruments Gain (Loss) Recognized in Income on Hedged Item Net	(2)		6	[1]	(1)		(10)
Gain (Loss) on Fair Value Hedge Ineffectiveness, Net	2	[1]	(4)	[1]	0		7
Gain (Loss) on Investments [Member] | Currency Swap [Member]
Derivatives, Fair Value [Line Items]
Derivative Instruments Gain (Loss) Recognized in Income on Hedged Item Net	0	[1]	(2)	[1]	0		0
Gain (Loss) on Fair Value Hedge Ineffectiveness, Net	0	[1]	2	[1]	0		0
Benefits, losses and loss adjustment expenses [Member] | Currency Swap [Member]
Derivatives, Fair Value [Line Items]
Derivative Instruments Gain (Loss) Recognized in Income on Hedged Item Net	0	[1]	1	[1]	0		2
Gain (Loss) on Fair Value Hedge Ineffectiveness, Net	$ 0	[1]	$ (1)	[1]	$ 0		$ (2)

[1] The amounts presented do not include the periodic net coupon settlements of the derivative or the coupon income (expense) related to the hedged item. The net of the amounts presented represents the ineffective portion of the hedge.