Fair Value Measurements (Details 1) (Income approach Valuation Technique [Member], Level 3 [Member], USD $) In Millions, unless otherwise specified	6 Months Ended	12 Months Ended
	Jun. 30, 2014	Dec. 31, 2013
International program hedging instruments [Member] | Equity options [Member]
Fair Value Assets Measured On Recurring Basis Unobservable Input [Abstract]
Assets accounted for at Fair Value on a recurring basis		$ (35)
Fair value measurements valuation techniques		Option model
Fair value measurements significant assumptions		Equity volatility
Positive or negative relationship of change in input to change in fair value measurement		Increase	[1]
International program hedging instruments [Member] | Long Interest Rate Swaptions [Member]
Fair Value Assets Measured On Recurring Basis Unobservable Input [Abstract]
Assets accounted for at Fair Value on a recurring basis		50
Fair value measurements valuation techniques		Option model
Fair value measurements significant assumptions		Interest rate volatility
Positive or negative relationship of change in input to change in fair value measurement		Increase	[1]
CMBS [Member]
Fair Value Assets Measured On Recurring Basis Unobservable Input [Abstract]
Assets accounted for at Fair Value on a recurring basis	471	663
Fair value measurements valuation techniques	Discounted cash flows	Discounted cash flows
Fair value measurements significant assumptions	Spread (encompasses prepayment, default risk and loss severity)	Spread (encompasses prepayment, default risk and loss severity)
Positive or negative relationship of change in input to change in fair value measurement	Decrease	Decrease	[2]
CMBS [Member] | Maximum [Member]
Fair Value Inputs [Abstract]
Fair Value Inputs, Counterparty Credit Risk	24.18%	30.00%
CMBS [Member] | Minimum [Member]
Fair Value Inputs [Abstract]
Fair Value Inputs, Counterparty Credit Risk	0.74%	0.99%
CMBS [Member] | Weighted Average [Member]
Fair Value Inputs [Abstract]
Fair Value Inputs, Counterparty Credit Risk	3.05%	5.27%
Corporate [Member]
Fair Value Assets Measured On Recurring Basis Unobservable Input [Abstract]
Assets accounted for at Fair Value on a recurring basis	675	665	[3]
Fair value measurements valuation techniques	Discounted cash flows	Discounted cash flows	[3]
Fair value measurements significant assumptions	Spread	Spread	[3]
Positive or negative relationship of change in input to change in fair value measurement	Decrease	Decrease	[2],[3]
Corporate [Member] | Maximum [Member]
Fair Value Inputs [Abstract]
Fair Value Inputs, Counterparty Credit Risk	7.03%	55.94%
Corporate [Member] | Minimum [Member]
Fair Value Inputs [Abstract]
Fair Value Inputs, Counterparty Credit Risk	1.08%	1.19%
Corporate [Member] | Weighted Average [Member]
Fair Value Inputs [Abstract]
Fair Value Inputs, Counterparty Credit Risk	2.51%	3.44%
Interest Rate Derivative [Member] | Interest Rate Swap [Member]
Fair Value Assets Measured On Recurring Basis Unobservable Input [Abstract]
Assets accounted for at Fair Value on a recurring basis		(24)
Fair value measurements valuation techniques		Discounted cash flows
Fair value measurements significant assumptions		Swap curve beyond 30 years
Positive or negative relationship of change in input to change in fair value measurement		Increase	[1]
Interest Rate Derivative [Member] | Long Interest Rate Swaptions [Member]
Fair Value Assets Measured On Recurring Basis Unobservable Input [Abstract]
Assets accounted for at Fair Value on a recurring basis	21	42
Fair value measurements valuation techniques	Option model	Option model
Fair value measurements significant assumptions	Interest rate volatility	Interest rate volatility
Positive or negative relationship of change in input to change in fair value measurement	Increase	Increase	[1]
U.S. GMWB Hedging Instruments [Member] | Equity options [Member]
Fair Value Assets Measured On Recurring Basis Unobservable Input [Abstract]
Assets accounted for at Fair Value on a recurring basis	33	72
Fair value measurements valuation techniques	Option model	Option model
Fair value measurements significant assumptions	Equity volatility	Equity volatility
Positive or negative relationship of change in input to change in fair value measurement	Increase	Increase	[1]
U.S. GMWB Hedging Instruments [Member] | Customized swaps [Member]
Fair Value Assets Measured On Recurring Basis Unobservable Input [Abstract]
Assets accounted for at Fair Value on a recurring basis	64	74
Fair value measurements valuation techniques	Discounted cash flows	Discounted cash flows
Fair value measurements significant assumptions	Equity volatility	Equity volatility
Positive or negative relationship of change in input to change in fair value measurement	Increase	Increase	[1]
U.S. Macro Hedge Program [Member] | Equity options [Member]
Fair Value Assets Measured On Recurring Basis Unobservable Input [Abstract]
Assets accounted for at Fair Value on a recurring basis	120	139
Fair value measurements valuation techniques	Option model	Option model
Fair value measurements significant assumptions	Equity volatility	Equity volatility
Positive or negative relationship of change in input to change in fair value measurement	Increase	Increase	[1]
Municipal [Member]
Fair Value Assets Measured On Recurring Basis Unobservable Input [Abstract]
Assets accounted for at Fair Value on a recurring basis	31	29
Fair value measurements valuation techniques	Discounted cash flows	Discounted cash flows
Fair value measurements significant assumptions	Spread	Spread
Positive or negative relationship of change in input to change in fair value measurement	Decrease	Decrease	[2]
Municipal [Member] | Maximum [Member]
Fair Value Inputs [Abstract]
Fair value inputs treasury yield	1.81%	1.84%
Municipal [Member] | Minimum [Member]
Fair Value Inputs [Abstract]
Fair value inputs treasury yield	1.81%	1.84%
Municipal [Member] | Weighted Average [Member]
Fair Value Inputs [Abstract]
Fair value inputs treasury yield	1.81%	1.84%
RMBS [Member]
Fair Value Assets Measured On Recurring Basis Unobservable Input [Abstract]
Assets accounted for at Fair Value on a recurring basis	$ 1,295	$ 1,272
Fair value measurements valuation techniques	Discounted cash flows	Discounted cash flows
RMBS Type 1 [Member]
Fair Value Assets Measured On Recurring Basis Unobservable Input [Abstract]
Fair value measurements significant assumptions	Spread	Spread
Positive or negative relationship of change in input to change in fair value measurement	Decrease	Decrease	[2]
RMBS Type 1 [Member] | Maximum [Member]
Fair Value Inputs [Abstract]
Fair Value Inputs, Counterparty Credit Risk	16.33%	17.48%
RMBS Type 1 [Member] | Minimum [Member]
Fair Value Inputs [Abstract]
Fair Value Inputs, Counterparty Credit Risk	0.49%	0.62%
RMBS Type 1 [Member] | Weighted Average [Member]
Fair Value Inputs [Abstract]
Fair Value Inputs, Counterparty Credit Risk	1.78%	2.32%
RMBS Type 2 [Member]
Fair Value Assets Measured On Recurring Basis Unobservable Input [Abstract]
Fair value measurements significant assumptions	Constant prepayment rate	Constant prepayment rate
Positive or negative relationship of change in input to change in fair value measurement	Decrease [4]	Decrease [4]	[2]
RMBS Type 3 [Member]
Fair Value Assets Measured On Recurring Basis Unobservable Input [Abstract]
Fair value measurements significant assumptions	Constant default rate	Constant default rate
Positive or negative relationship of change in input to change in fair value measurement	Decrease	Decrease	[2]
RMBS Type 4 [Member]
Fair Value Assets Measured On Recurring Basis Unobservable Input [Abstract]
Fair value measurements significant assumptions	Loss severity	Loss severity
Positive or negative relationship of change in input to change in fair value measurement	Decrease	Decrease	[2]

[1] Conversely, the impact of a decrease in input would have the opposite impact to the fair value as that presented in the table. Changes are based on long positions, unless otherwise noted. Changes in fair value will be inversely impacted for short positions.

[2] Conversely, the impact of a decrease in input would have the opposite impact to the fair value as that presented in the table above.

[3] [3]Level 3 corporate and municipal securities excludes those for which the Company bases fair value on broker quotations as discussed below.