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Fair Value Measurements (Details 1) (USD $)
In Millions, unless otherwise specified
 9 Months Ended 12 Months Ended 9 Months Ended 12 Months Ended 9 Months Ended 12 Months Ended 9 Months Ended 12 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended 9 Months Ended 12 Months Ended 9 Months Ended 12 Months Ended 9 Months Ended 12 Months Ended 9 Months Ended 12 Months Ended 9 Months Ended 12 Months Ended 9 Months Ended 12 Months Ended 9 Months Ended 12 Months Ended 9 Months Ended 12 Months Ended 9 Months Ended 12 Months Ended 9 Months Ended 12 Months Ended 9 Months Ended 12 Months Ended 9 Months Ended 12 Months Ended 9 Months Ended 12 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended 9 Months Ended 12 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended 9 Months Ended 12 Months Ended 9 Months Ended 12 Months Ended 9 Months Ended 12 Months Ended 9 Months Ended 12 Months Ended 9 Months Ended 12 Months Ended 9 Months Ended 12 Months Ended 9 Months Ended 12 Months Ended 9 Months Ended 12 Months Ended 9 Months Ended 12 Months Ended 9 Months Ended 12 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2013
Level 3 [Member]
Income approach Valuation Technique [Member]
International program hedging instruments [Member]
Equity options [Member]
Dec. 31, 2012
Level 3 [Member]
Income approach Valuation Technique [Member]
International program hedging instruments [Member]
Equity options [Member]
Dec. 31, 2012
Level 3 [Member]
Income approach Valuation Technique [Member]
International program hedging instruments [Member]
Long Interest Rate Swaptions [Member]
Sep. 30, 2013
Level 3 [Member]
Income approach Valuation Technique [Member]
Maximum [Member]
International program hedging instruments [Member]
Equity options [Member]
Dec. 31, 2012
Level 3 [Member]
Income approach Valuation Technique [Member]
Maximum [Member]
International program hedging instruments [Member]
Equity options [Member]
Dec. 31, 2012
Level 3 [Member]
Income approach Valuation Technique [Member]
Maximum [Member]
International program hedging instruments [Member]
Long Interest Rate Swaptions [Member]
Sep. 30, 2013
Level 3 [Member]
Income approach Valuation Technique [Member]
Minimum [Member]
International program hedging instruments [Member]
Equity options [Member]
Dec. 31, 2012
Level 3 [Member]
Income approach Valuation Technique [Member]
Minimum [Member]
International program hedging instruments [Member]
Equity options [Member]
Dec. 31, 2012
Level 3 [Member]
Income approach Valuation Technique [Member]
Minimum [Member]
International program hedging instruments [Member]
Long Interest Rate Swaptions [Member]
Sep. 30, 2013
Level 3 [Member]
Income approach Valuation Technique [Member]
CMBS [Member]
Dec. 31, 2012
Level 3 [Member]
Income approach Valuation Technique [Member]
CMBS [Member]
Dec. 31, 2012
Level 3 [Member]
Income approach Valuation Technique [Member]
CMBS [Member]
Maximum [Member]
Sep. 30, 2013
Level 3 [Member]
Income approach Valuation Technique [Member]
CMBS [Member]
Maximum [Member]
Dec. 31, 2012
Level 3 [Member]
Income approach Valuation Technique [Member]
CMBS [Member]
Minimum [Member]
Sep. 30, 2013
Level 3 [Member]
Income approach Valuation Technique [Member]
CMBS [Member]
Minimum [Member]
Dec. 31, 2012
Level 3 [Member]
Income approach Valuation Technique [Member]
CMBS [Member]
Weighted Average [Member]
Sep. 30, 2013
Level 3 [Member]
Income approach Valuation Technique [Member]
CMBS [Member]
Weighted Average [Member]
Sep. 30, 2013
Level 3 [Member]
Income approach Valuation Technique [Member]
Corporate [Member]
Dec. 31, 2012
Level 3 [Member]
Income approach Valuation Technique [Member]
Corporate [Member]
Dec. 31, 2012
Level 3 [Member]
Income approach Valuation Technique [Member]
Corporate [Member]
Maximum [Member]
Sep. 30, 2013
Level 3 [Member]
Income approach Valuation Technique [Member]
Corporate [Member]
Maximum [Member]
Dec. 31, 2012
Level 3 [Member]
Income approach Valuation Technique [Member]
Corporate [Member]
Minimum [Member]
Sep. 30, 2013
Level 3 [Member]
Income approach Valuation Technique [Member]
Corporate [Member]
Minimum [Member]
Dec. 31, 2012
Level 3 [Member]
Income approach Valuation Technique [Member]
Corporate [Member]
Weighted Average [Member]
Sep. 30, 2013
Level 3 [Member]
Income approach Valuation Technique [Member]
Corporate [Member]
Weighted Average [Member]
Dec. 31, 2012
Level 3 [Member]
Income approach Valuation Technique [Member]
Equity Derivatives [Member]
Equity options [Member]
Dec. 31, 2012
Level 3 [Member]
Income approach Valuation Technique [Member]
Equity Derivatives [Member]
Maximum [Member]
Equity options [Member]
Dec. 31, 2012
Level 3 [Member]
Income approach Valuation Technique [Member]
Equity Derivatives [Member]
Minimum [Member]
Equity options [Member]
Sep. 30, 2013
Level 3 [Member]
Income approach Valuation Technique [Member]
Interest Rate Derivative [Member]
Interest Rate Swap [Member]
Dec. 31, 2012
Level 3 [Member]
Income approach Valuation Technique [Member]
Interest Rate Derivative [Member]
Interest Rate Swap [Member]
Sep. 30, 2013
Level 3 [Member]
Income approach Valuation Technique [Member]
Interest Rate Derivative [Member]
Maximum [Member]
Interest Rate Swap [Member]
Dec. 31, 2012
Level 3 [Member]
Income approach Valuation Technique [Member]
Interest Rate Derivative [Member]
Maximum [Member]
Interest Rate Swap [Member]
Sep. 30, 2013
Level 3 [Member]
Income approach Valuation Technique [Member]
Interest Rate Derivative [Member]
Minimum [Member]
Interest Rate Swap [Member]
Dec. 31, 2012
Level 3 [Member]
Income approach Valuation Technique [Member]
Interest Rate Derivative [Member]
Minimum [Member]
Interest Rate Swap [Member]
Sep. 30, 2013
Level 3 [Member]
Income approach Valuation Technique [Member]
U.S. GMWB Hedging Instruments [Member]
Equity options [Member]
Dec. 31, 2012
Level 3 [Member]
Income approach Valuation Technique [Member]
U.S. GMWB Hedging Instruments [Member]
Equity options [Member]
Sep. 30, 2013
Level 3 [Member]
Income approach Valuation Technique [Member]
U.S. GMWB Hedging Instruments [Member]
Customized swaps [Member]
Dec. 31, 2012
Level 3 [Member]
Income approach Valuation Technique [Member]
U.S. GMWB Hedging Instruments [Member]
Customized swaps [Member]
Sep. 30, 2013
Level 3 [Member]
Income approach Valuation Technique [Member]
U.S. GMWB Hedging Instruments [Member]
Maximum [Member]
Equity options [Member]
Dec. 31, 2012
Level 3 [Member]
Income approach Valuation Technique [Member]
U.S. GMWB Hedging Instruments [Member]
Maximum [Member]
Equity options [Member]
Sep. 30, 2013
Level 3 [Member]
Income approach Valuation Technique [Member]
U.S. GMWB Hedging Instruments [Member]
Maximum [Member]
Customized swaps [Member]
Dec. 31, 2012
Level 3 [Member]
Income approach Valuation Technique [Member]
U.S. GMWB Hedging Instruments [Member]
Maximum [Member]
Customized swaps [Member]
Sep. 30, 2013
Level 3 [Member]
Income approach Valuation Technique [Member]
U.S. GMWB Hedging Instruments [Member]
Minimum [Member]
Equity options [Member]
Dec. 31, 2012
Level 3 [Member]
Income approach Valuation Technique [Member]
U.S. GMWB Hedging Instruments [Member]
Minimum [Member]
Equity options [Member]
Sep. 30, 2013
Level 3 [Member]
Income approach Valuation Technique [Member]
U.S. GMWB Hedging Instruments [Member]
Minimum [Member]
Customized swaps [Member]
Dec. 31, 2012
Level 3 [Member]
Income approach Valuation Technique [Member]
U.S. GMWB Hedging Instruments [Member]
Minimum [Member]
Customized swaps [Member]
Sep. 30, 2013
Level 3 [Member]
Income approach Valuation Technique [Member]
U.S. Macro Hedge Program [Member]
Equity options [Member]
Dec. 31, 2012
Level 3 [Member]
Income approach Valuation Technique [Member]
U.S. Macro Hedge Program [Member]
Equity options [Member]
Sep. 30, 2013
Level 3 [Member]
Income approach Valuation Technique [Member]
U.S. Macro Hedge Program [Member]
Maximum [Member]
Equity options [Member]
Dec. 31, 2012
Level 3 [Member]
Income approach Valuation Technique [Member]
U.S. Macro Hedge Program [Member]
Maximum [Member]
Equity options [Member]
Sep. 30, 2013
Level 3 [Member]
Income approach Valuation Technique [Member]
U.S. Macro Hedge Program [Member]
Minimum [Member]
Equity options [Member]
Dec. 31, 2012
Level 3 [Member]
Income approach Valuation Technique [Member]
U.S. Macro Hedge Program [Member]
Minimum [Member]
Equity options [Member]
Sep. 30, 2013
Level 3 [Member]
Income approach Valuation Technique [Member]
Municipal [Member]
Dec. 31, 2012
Level 3 [Member]
Income approach Valuation Technique [Member]
Municipal [Member]
Dec. 31, 2012
Level 3 [Member]
Income approach Valuation Technique [Member]
Municipal [Member]
Maximum [Member]
Sep. 30, 2013
Level 3 [Member]
Income approach Valuation Technique [Member]
Municipal [Member]
Maximum [Member]
Dec. 31, 2012
Level 3 [Member]
Income approach Valuation Technique [Member]
Municipal [Member]
Minimum [Member]
Sep. 30, 2013
Level 3 [Member]
Income approach Valuation Technique [Member]
Municipal [Member]
Minimum [Member]
Dec. 31, 2012
Level 3 [Member]
Income approach Valuation Technique [Member]
Municipal [Member]
Weighted Average [Member]
Sep. 30, 2013
Level 3 [Member]
Income approach Valuation Technique [Member]
Municipal [Member]
Weighted Average [Member]
Sep. 30, 2013
Level 3 [Member]
Income approach Valuation Technique [Member]
RMBS [Member]
Dec. 31, 2012
Level 3 [Member]
Income approach Valuation Technique [Member]
RMBS [Member]
Sep. 30, 2013
Level 3 [Member]
Income approach Valuation Technique [Member]
RMBS Type 1 [Member]
Dec. 31, 2012
Level 3 [Member]
Income approach Valuation Technique [Member]
RMBS Type 1 [Member]
Dec. 31, 2012
Level 3 [Member]
Income approach Valuation Technique [Member]
RMBS Type 1 [Member]
Maximum [Member]
Sep. 30, 2013
Level 3 [Member]
Income approach Valuation Technique [Member]
RMBS Type 1 [Member]
Maximum [Member]
Dec. 31, 2012
Level 3 [Member]
Income approach Valuation Technique [Member]
RMBS Type 1 [Member]
Minimum [Member]
Sep. 30, 2013
Level 3 [Member]
Income approach Valuation Technique [Member]
RMBS Type 1 [Member]
Minimum [Member]
Dec. 31, 2012
Level 3 [Member]
Income approach Valuation Technique [Member]
RMBS Type 1 [Member]
Weighted Average [Member]
Sep. 30, 2013
Level 3 [Member]
Income approach Valuation Technique [Member]
RMBS Type 1 [Member]
Weighted Average [Member]
Sep. 30, 2013
Level 3 [Member]
Income approach Valuation Technique [Member]
RMBS Type 2 [Member]
Dec. 31, 2012
Level 3 [Member]
Income approach Valuation Technique [Member]
RMBS Type 2 [Member]
Sep. 30, 2013
Level 3 [Member]
Income approach Valuation Technique [Member]
RMBS Type 2 [Member]
Maximum [Member]
Dec. 31, 2012
Level 3 [Member]
Income approach Valuation Technique [Member]
RMBS Type 2 [Member]
Maximum [Member]
Sep. 30, 2013
Level 3 [Member]
Income approach Valuation Technique [Member]
RMBS Type 2 [Member]
Minimum [Member]
Dec. 31, 2012
Level 3 [Member]
Income approach Valuation Technique [Member]
RMBS Type 2 [Member]
Minimum [Member]
Sep. 30, 2013
Level 3 [Member]
Income approach Valuation Technique [Member]
RMBS Type 2 [Member]
Weighted Average [Member]
Dec. 31, 2012
Level 3 [Member]
Income approach Valuation Technique [Member]
RMBS Type 2 [Member]
Weighted Average [Member]
Sep. 30, 2013
Level 3 [Member]
Income approach Valuation Technique [Member]
RMBS Type 3 [Member]
Dec. 31, 2012
Level 3 [Member]
Income approach Valuation Technique [Member]
RMBS Type 3 [Member]
Sep. 30, 2013
Level 3 [Member]
Income approach Valuation Technique [Member]
RMBS Type 3 [Member]
Maximum [Member]
Dec. 31, 2012
Level 3 [Member]
Income approach Valuation Technique [Member]
RMBS Type 3 [Member]
Maximum [Member]
Sep. 30, 2013
Level 3 [Member]
Income approach Valuation Technique [Member]
RMBS Type 3 [Member]
Minimum [Member]
Dec. 31, 2012
Level 3 [Member]
Income approach Valuation Technique [Member]
RMBS Type 3 [Member]
Minimum [Member]
Sep. 30, 2013
Level 3 [Member]
Income approach Valuation Technique [Member]
RMBS Type 3 [Member]
Weighted Average [Member]
Dec. 31, 2012
Level 3 [Member]
Income approach Valuation Technique [Member]
RMBS Type 3 [Member]
Weighted Average [Member]
Sep. 30, 2013
Level 3 [Member]
Income approach Valuation Technique [Member]
RMBS Type 4 [Member]
Dec. 31, 2012
Level 3 [Member]
Income approach Valuation Technique [Member]
RMBS Type 4 [Member]
Sep. 30, 2013
Level 3 [Member]
Income approach Valuation Technique [Member]
RMBS Type 4 [Member]
Maximum [Member]
Dec. 31, 2012
Level 3 [Member]
Income approach Valuation Technique [Member]
RMBS Type 4 [Member]
Maximum [Member]
Sep. 30, 2013
Level 3 [Member]
Income approach Valuation Technique [Member]
RMBS Type 4 [Member]
Minimum [Member]
Dec. 31, 2012
Level 3 [Member]
Income approach Valuation Technique [Member]
RMBS Type 4 [Member]
Minimum [Member]
Sep. 30, 2013
Level 3 [Member]
Income approach Valuation Technique [Member]
RMBS Type 4 [Member]
Weighted Average [Member]
Dec. 31, 2012
Level 3 [Member]
Income approach Valuation Technique [Member]
RMBS Type 4 [Member]
Weighted Average [Member]
Sep. 30, 2013
Fair Value, Measurements, Recurring [Member]
Dec. 31, 2012
Fair Value, Measurements, Recurring [Member]
Sep. 30, 2013
Fair Value, Measurements, Recurring [Member]
Other Contract [Member]
Sep. 30, 2013
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Dec. 31, 2012
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Sep. 30, 2013
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Other Contract [Member]
Sep. 30, 2013
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 1 [Member]
Dec. 31, 2012
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 1 [Member]
Sep. 30, 2013
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 1 [Member]
Other Contract [Member]
Sep. 30, 2013
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 2 [Member]
Dec. 31, 2012
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 2 [Member]
Sep. 30, 2013
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 2 [Member]
Other Contract [Member]
Sep. 30, 2013
Macro Hedge Program [Member]
Fair Value, Measurements, Recurring [Member]
UNITED STATES
Dec. 31, 2012
Macro Hedge Program [Member]
Fair Value, Measurements, Recurring [Member]
UNITED STATES
Sep. 30, 2013
Macro Hedge Program [Member]
Fair Value, Measurements, Recurring [Member]
UNITED STATES
Level 3 [Member]
Dec. 31, 2012
Macro Hedge Program [Member]
Fair Value, Measurements, Recurring [Member]
UNITED STATES
Level 3 [Member]
Sep. 30, 2013
Macro Hedge Program [Member]
Fair Value, Measurements, Recurring [Member]
UNITED STATES
Fair Value, Inputs, Level 1 [Member]
Dec. 31, 2012
Macro Hedge Program [Member]
Fair Value, Measurements, Recurring [Member]
UNITED STATES
Fair Value, Inputs, Level 1 [Member]
Sep. 30, 2013
Macro Hedge Program [Member]
Fair Value, Measurements, Recurring [Member]
UNITED STATES
Fair Value, Inputs, Level 2 [Member]
Dec. 31, 2012
Macro Hedge Program [Member]
Fair Value, Measurements, Recurring [Member]
UNITED STATES
Fair Value, Inputs, Level 2 [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]                                                                                                                                                                                                                                    
Derivative Assets                                                                                                                                                                                                 $ 0     $ 0            $ 0 $ 160 $ 186 $ 160 $ 186 $ 0 $ 0 $ 0 $ 0
Liabilities, Fair Value Disclosure                                                                                                                                                                                             1,821 3,091   1,147 2,651   0 0   674 440   (21) (100) (21) (100) 0 0 0 0
Fair Value Assets Measured On Recurring Basis Unobservable Input [Abstract]                                                                                                                                                                                                                                    
Assets accounted for at Fair Value on a recurring basis $ (171) $ 44 $ (119)             $ 470 $ 532             $ 431 [1] $ 888 [1]             $ 45     $ (26) $ (57)         $ 108 $ 281 $ 111 $ 238                 $ 181 $ 286         $ 108 $ 169             $ 920 $ 1,133                                                                                                        
Fair value measurements valuation techniques Option model Option model Option model             Discounted cash flows Discounted cash flows             Discounted cash flows [1] Discounted cash flows [1]             Option model     Discounted  cash flows Discounted  cash flows         Option model Option model Discounted  cash flows Discounted  cash flows                 Option model Option model         Discounted cash flows Discounted cash flows             Discounted cash flows Discounted cash flows                                                                                                        
Fair value measurements significant assumptions Equity volatility Equity volatility Interest rate volatility             Spread (encompasses prepayment, default risk and loss severity) Spread (encompasses prepayment, default risk and loss severity)             Spread [1] Spread [1]             Equity volatility     Swap curve  beyond 30 years Swap curve  beyond 30 years         Equity volatility Equity volatility Equity volatility Equity volatility                 Equity volatility Equity volatility         Spread Spread                 Spread Spread             Constant prepayment rate Constant prepayment rate             Constant default rate Constant default rate             Loss severity Loss severity                                                    
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Value Relationships of Change Increase [2] Increase [2] Increase [2]             Decrease [3] Decrease [3]             Decrease [1],[3] Decrease [1],[3]             Increase [2]     Increase [2] Increase [2]         Increase [2] Increase [2] Increase [2]                   Increase [2] Increase [2]         Decrease [3] Decrease [3]                 Decrease [3] Decrease [3]             Decrease [4] [3],[4] Decrease [4] [3],[4]             Decrease [3] Decrease [3]             Decrease [3] Decrease [3]                                                    
Fair Value Inputs [Abstract]                                                                                                                                                                                                                                    
Fair Value Inputs Counterparty Credit Risk                       36.15% 26.15% 3.20% 0.67% 10.13% 6.24%     9.00% 50.14% 1.45% 1.75% 3.33% 3.88%                                                                               16.89% 19.92% 0.54% 0.64% 3.79% 2.84%                                                                                        
Fair Value Inputs Treasury Yield                                                                                                             3.44% 2.90% 2.27% 1.92% 2.54% 2.29%                                                                                                            
Fair Value Inputs, Prepayment Rate                                                                                                                                                 10.00% 12.00% 0.00% 0.00% 2.00% [5] 2.00% [5]                                                                        
Fair Value Inputs, Probability of Default                                                                                                                                                                 17.00% 24.00% 1.00% 1.00% 8.00% [5] 8.00% [5]                                                        
Fair Value Inputs, Loss Severity                                                                                                                                                                                 100.00% 100.00% 0.00% 0.00% 79.00% [5] 80.00% [5]                                        
Fair Value Inputs Equity Volatility       39.00% 33.00% 1.00% 29.00% 22.00% 0.00%                                   24.00% 13.00%                     36.00% 31.00% 50.00% 50.00% 21.00% 10.00% 10.00% 10.00%     34.00% 43.00% 22.00% 24.00%                                                                                                                            
Fair Value Inputs Interest Rate Volatility                                                             3.40% 2.80% 3.40% 2.80%                                                                                                                                                                
[1] Level 3 corporate securities excludes those for which the Company bases fair value on broker quotations as discussed below.
[2] 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.
[3] Conversely, the impact of a decrease in input would have the opposite impact to the fair value as that presented in the table above.
[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.