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Fair Value Measurements (Assets Measured at Fair Values) (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
International program hedging instruments [Member] | Income approach Valuation Technique [Member] | Level 3 [Member] | Equity options [Member]
    
Fair Value Assets Measured On Recurring Basis Unobservable Input [Abstract]    
Assets accounted for at fair value on a recurring basis $ (66) $ 44
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 [1] Increase
International program hedging instruments [Member] | Income approach Valuation Technique [Member] | Level 3 [Member] | Short Interest Rate Swaptions [Member]
    
Fair Value Assets Measured On Recurring Basis Unobservable Input [Abstract]    
Assets accounted for at fair value on a recurring basis (12)  
Fair value measurements significant assumptions Interest rate volatility  
Positive or negative relationship of change in input to change in fair value measurement Decrease [1]  
International program hedging instruments [Member] | Income approach Valuation Technique [Member] | Level 3 [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 48 (119)
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 [1] Increase
Maximum [Member] | International program hedging instruments [Member] | Income approach Valuation Technique [Member] | Level 3 [Member] | Equity options [Member]
    
Fair Value Assets Measured On Recurring Basis Unobservable Input [Abstract]    
Fair Value Inputs Equity Volatility 37.00% 33.00%
Maximum [Member] | International program hedging instruments [Member] | Income approach Valuation Technique [Member] | Level 3 [Member] | Short Interest Rate Swaptions [Member]
    
Fair Value Assets Measured On Recurring Basis Unobservable Input [Abstract]    
Fair Value Inputs Equity Volatility 1.00%  
Maximum [Member] | International program hedging instruments [Member] | Income approach Valuation Technique [Member] | Level 3 [Member] | Long Interest Rate Swaptions [Member]
    
Fair Value Assets Measured On Recurring Basis Unobservable Input [Abstract]    
Fair Value Inputs Equity Volatility 1.00% 1.00%
Minimum [Member] | International program hedging instruments [Member] | Income approach Valuation Technique [Member] | Level 3 [Member] | Equity options [Member]
    
Fair Value Assets Measured On Recurring Basis Unobservable Input [Abstract]    
Fair Value Inputs Equity Volatility 29.00% 22.00%
Minimum [Member] | International program hedging instruments [Member] | Income approach Valuation Technique [Member] | Level 3 [Member] | Short Interest Rate Swaptions [Member]
    
Fair Value Assets Measured On Recurring Basis Unobservable Input [Abstract]    
Fair Value Inputs Equity Volatility 0.00%  
Minimum [Member] | International program hedging instruments [Member] | Income approach Valuation Technique [Member] | Level 3 [Member] | Long Interest Rate Swaptions [Member]
    
Fair Value Assets Measured On Recurring Basis Unobservable Input [Abstract]    
Fair Value Inputs Equity Volatility 1000000.00% 0.00%
Free standing Derivatives [Member]
    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Fair Value Measurement with Unobservable Inputs Reconciliation Recurring Basis Asset Netted Against Liability Transfers into Level Three 28  
CMBS [Member] | Income approach Valuation Technique [Member] | Level 3 [Member]
    
Fair Value Assets Measured On Recurring Basis Unobservable Input [Abstract]    
Assets accounted for at fair value on a recurring basis 360 532
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 [2] Decrease
CMBS [Member] | Maximum [Member] | Income approach Valuation Technique [Member] | Level 3 [Member]
    
Fair Value Inputs [Abstract]    
Fair Value Inputs, Counterparty Credit Risk 25.11%  
CMBS [Member] | Minimum [Member] | Income approach Valuation Technique [Member] | Level 3 [Member]
    
Fair Value Inputs [Abstract]    
Fair Value Inputs, Counterparty Credit Risk 0.99%  
CMBS [Member] | Weighted Average [Member] | Income approach Valuation Technique [Member] | Level 3 [Member]
    
Fair Value Inputs [Abstract]    
Fair Value Inputs, Counterparty Credit Risk 4.46%  
Corporate [Member] | Income approach Valuation Technique [Member] | Level 3 [Member]
    
Fair Value Assets Measured On Recurring Basis Unobservable Input [Abstract]    
Assets accounted for at fair value on a recurring basis 398 [3] 888
Fair value measurements valuation techniques Discounted cash flows [3] Discounted cash flows
Fair value measurements significant assumptions Spread [3] Spread
Positive or negative relationship of change in input to change in fair value measurement Decrease [2],[3] Decrease
Corporate [Member] | Maximum [Member] | Income approach Valuation Technique [Member] | Level 3 [Member]
    
Fair Value Inputs [Abstract]    
Fair Value Inputs, Counterparty Credit Risk 55.94%  
Corporate [Member] | Minimum [Member] | Income approach Valuation Technique [Member] | Level 3 [Member]
    
Fair Value Inputs [Abstract]    
Fair Value Inputs, Counterparty Credit Risk 1.19%  
Corporate [Member] | Weighted Average [Member] | Income approach Valuation Technique [Member] | Level 3 [Member]
    
Fair Value Inputs [Abstract]    
Fair Value Inputs, Counterparty Credit Risk 3.32%  
Equity Derivatives [Member] | Income approach Valuation Technique [Member] | Level 3 [Member] | Equity options [Member]
    
Fair Value Assets Measured On Recurring Basis Unobservable Input [Abstract]    
Assets accounted for at fair value on a recurring basis   45
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
Equity Derivatives [Member] | Maximum [Member] | Income approach Valuation Technique [Member] | Level 3 [Member] | Equity options [Member]
    
Fair Value Assets Measured On Recurring Basis Unobservable Input [Abstract]    
Fair Value Inputs Equity Volatility   24.00%
Equity Derivatives [Member] | Minimum [Member] | Income approach Valuation Technique [Member] | Level 3 [Member] | Equity options [Member]
    
Fair Value Assets Measured On Recurring Basis Unobservable Input [Abstract]    
Fair Value Inputs Equity Volatility   13.00%
Interest Rate Derivative [Member] | Income approach Valuation Technique [Member] | Level 3 [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) (57)
Fair value measurements valuation techniques Discounted  cash flows Discounted  cash flows
Fair value measurements significant assumptions Swap curve  beyond 30 years Swap curve  beyond 30 years
Positive or negative relationship of change in input to change in fair value measurement Increase [1] Increase
Interest Rate Derivative [Member] | Maximum [Member] | Income approach Valuation Technique [Member] | Level 3 [Member] | Interest Rate Swap [Member]
    
Fair Value Assets Measured On Recurring Basis Unobservable Input [Abstract]    
Fair Value Inputs Interest Rate Volatility 4.00% 2.80%
Interest Rate Derivative [Member] | Minimum [Member] | Income approach Valuation Technique [Member] | Level 3 [Member] | Interest Rate Swap [Member]
    
Fair Value Assets Measured On Recurring Basis Unobservable Input [Abstract]    
Fair Value Inputs Interest Rate Volatility 4.00% 2.80%
U.S. GMWB Hedging Instruments [Member] | Income approach Valuation Technique [Member] | Level 3 [Member] | Equity options [Member]
    
Fair Value Assets Measured On Recurring Basis Unobservable Input [Abstract]    
Assets accounted for at fair value on a recurring basis 72 281
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 [1] Increase
U.S. GMWB Hedging Instruments [Member] | Customized swaps [Member] | Income approach Valuation Technique [Member] | Level 3 [Member]
    
Fair Value Assets Measured On Recurring Basis Unobservable Input [Abstract]    
Assets accounted for at fair value on a recurring basis 74 238
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 [1]  
U.S. GMWB Hedging Instruments [Member] | Maximum [Member] | Income approach Valuation Technique [Member] | Level 3 [Member] | Equity options [Member]
    
Fair Value Assets Measured On Recurring Basis Unobservable Input [Abstract]    
Fair Value Inputs Equity Volatility 29.00% 31.00%
U.S. GMWB Hedging Instruments [Member] | Maximum [Member] | Customized swaps [Member] | Income approach Valuation Technique [Member] | Level 3 [Member]
    
Fair Value Assets Measured On Recurring Basis Unobservable Input [Abstract]    
Fair Value Inputs Equity Volatility 50.00% 50.00%
U.S. GMWB Hedging Instruments [Member] | Minimum [Member] | Income approach Valuation Technique [Member] | Level 3 [Member] | Equity options [Member]
    
Fair Value Assets Measured On Recurring Basis Unobservable Input [Abstract]    
Fair Value Inputs Equity Volatility 21.00% 10.00%
U.S. GMWB Hedging Instruments [Member] | Minimum [Member] | Customized swaps [Member] | Income approach Valuation Technique [Member] | Level 3 [Member]
    
Fair Value Assets Measured On Recurring Basis Unobservable Input [Abstract]    
Fair Value Inputs Equity Volatility 10.00% 10.00%
Municipal [Member] | Income approach Valuation Technique [Member] | Level 3 [Member]
    
Fair Value Assets Measured On Recurring Basis Unobservable Input [Abstract]    
Assets accounted for at fair value on a recurring basis 29 169
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 [2] Decrease
Municipal [Member] | Maximum [Member] | Income approach Valuation Technique [Member] | Level 3 [Member]
    
Fair Value Inputs [Abstract]    
Fair value inputs treasury yield 1.84%  
Municipal [Member] | Minimum [Member] | Income approach Valuation Technique [Member] | Level 3 [Member]
    
Fair Value Inputs [Abstract]    
Fair value inputs treasury yield 1.84%  
Municipal [Member] | Weighted Average [Member] | Income approach Valuation Technique [Member] | Level 3 [Member]
    
Fair Value Inputs [Abstract]    
Fair value inputs treasury yield 1.84%  
RMBS [Member] | Income approach Valuation Technique [Member] | Level 3 [Member]
    
Fair Value Assets Measured On Recurring Basis Unobservable Input [Abstract]    
Assets accounted for at fair value on a recurring basis 798 1,133
Fair value measurements valuation techniques Discounted cash flows Discounted cash flows
RMBS Type 1 [Member] | Income approach Valuation Technique [Member] | Level 3 [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 [2] Decrease
RMBS Type 1 [Member] | Maximum [Member] | Income approach Valuation Technique [Member] | Level 3 [Member]
    
Fair Value Inputs [Abstract]    
Fair Value Inputs, Counterparty Credit Risk 17.48%  
RMBS Type 1 [Member] | Minimum [Member] | Income approach Valuation Technique [Member] | Level 3 [Member]
    
Fair Value Inputs [Abstract]    
Fair Value Inputs, Counterparty Credit Risk 0.62%  
RMBS Type 1 [Member] | Weighted Average [Member] | Income approach Valuation Technique [Member] | Level 3 [Member]
    
Fair Value Inputs [Abstract]    
Fair Value Inputs, Counterparty Credit Risk 2.45%  
RMBS Type 2 [Member] | Income approach Valuation Technique [Member] | Level 3 [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] [2],[4] Decrease [4]
RMBS Type 2 [Member] | Maximum [Member] | Income approach Valuation Technique [Member] | Level 3 [Member]
    
Fair Value Assets Measured On Recurring Basis Unobservable Input [Abstract]    
Fair Value Inputs, Prepayment Rate 10.00% 12.00%
RMBS Type 2 [Member] | Minimum [Member] | Income approach Valuation Technique [Member] | Level 3 [Member]
    
Fair Value Assets Measured On Recurring Basis Unobservable Input [Abstract]    
Fair Value Inputs, Prepayment Rate 0.00% 0.00%
RMBS Type 2 [Member] | Weighted Average [Member] | Income approach Valuation Technique [Member] | Level 3 [Member]
    
Fair Value Assets Measured On Recurring Basis Unobservable Input [Abstract]    
Fair Value Inputs, Prepayment Rate 3.00% [5] 2.00%
RMBS Type 3 [Member] | Income approach Valuation Technique [Member] | Level 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 [2] Decrease
RMBS Type 3 [Member] | Maximum [Member] | Income approach Valuation Technique [Member] | Level 3 [Member]
    
Fair Value Assets Measured On Recurring Basis Unobservable Input [Abstract]    
Fair Value Inputs, Probability of Default 22.00% 24.00%
RMBS Type 3 [Member] | Minimum [Member] | Income approach Valuation Technique [Member] | Level 3 [Member]
    
Fair Value Assets Measured On Recurring Basis Unobservable Input [Abstract]    
Fair Value Inputs, Probability of Default 1.00% 1.00%
RMBS Type 3 [Member] | Weighted Average [Member] | Income approach Valuation Technique [Member] | Level 3 [Member]
    
Fair Value Assets Measured On Recurring Basis Unobservable Input [Abstract]    
Fair Value Inputs, Probability of Default 8.00% [5] 8.00%
RMBS Type 4 [Member] | Income approach Valuation Technique [Member] | Level 3 [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 [2] Decrease
RMBS Type 4 [Member] | Maximum [Member] | Income approach Valuation Technique [Member] | Level 3 [Member]
    
Fair Value Assets Measured On Recurring Basis Unobservable Input [Abstract]    
Fair Value Inputs, Loss Severity 100.00% 100.00%
RMBS Type 4 [Member] | Minimum [Member] | Income approach Valuation Technique [Member] | Level 3 [Member]
    
Fair Value Assets Measured On Recurring Basis Unobservable Input [Abstract]    
Fair Value Inputs, Loss Severity 0.00% 0.00%
RMBS Type 4 [Member] | Weighted Average [Member] | Income approach Valuation Technique [Member] | Level 3 [Member]
    
Fair Value Assets Measured On Recurring Basis Unobservable Input [Abstract]    
Fair Value Inputs, Loss Severity 80.00% [5] 80.00%
US Macro Hedge Program [Member] | Income approach Valuation Technique [Member] | Level 3 [Member] | Equity options [Member]
    
Fair Value Assets Measured On Recurring Basis Unobservable Input [Abstract]    
Assets accounted for at fair value on a recurring basis 139 286
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 [1] Increase
US Macro Hedge Program [Member] | Maximum [Member] | Income approach Valuation Technique [Member] | Level 3 [Member] | Equity options [Member]
    
Fair Value Assets Measured On Recurring Basis Unobservable Input [Abstract]    
Fair Value Inputs Equity Volatility 31.00% 43.00%
US Macro Hedge Program [Member] | Minimum [Member] | Income approach Valuation Technique [Member] | Level 3 [Member] | Equity options [Member]
    
Fair Value Assets Measured On Recurring Basis Unobservable Input [Abstract]    
Fair Value Inputs Equity Volatility 24.00% 24.00%
US Macro Hedge Program [Member] | UNITED STATES | Free standing Derivatives [Member]
    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Fair Value Measurement with Unobservable Inputs Reconciliation Recurring Basis Asset Netted Against Liability Transfers into Level Three $ 0  
[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] Level 3 corporate and municipal securities excludes those for which the Company bases fair value on broker quotations as discussed below.
[4] Decrease for above market rate coupons and increase for below market rate coupons.
[5] The weighted average is determined based on the fair value of the securities