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Derivative Instruments (Gross Notional Amount and Fair Value of Derivatives Contracts) (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Notional Value    
Total Derivatives $ 26,749,895 [1] $ 26,520,138 [1]
Fair Value Asset    
Total Derivatives 111,091 [1] 187,616 [1]
Fair Value Liability    
Total Derivatives 120,443 [1] 68,689 [1]
Designated as Hedging Instrument [Member]
   
Notional Value    
Qualifying Hedge Relationships 171,034 145,174
Fair Value Asset    
Derivative Fair Value Of Derivative Asset 8,114 4,152
Fair Value Liability    
Derivative Fair Value Of Derivative Liability 2,195 3,904
Nondesignated [Member]
   
Notional Value    
Non-Qualifying Hedge Relationships 26,578,861 26,374,964
Fair Value Asset    
Derivative Fair Value Of Derivative Asset 102,977 183,464
Fair Value Liability    
Derivative Fair Value Of Derivative Liability 118,248 64,785
Interest Rate Swap Member
   
Notional Value    
Non-Qualifying Hedge Relationships 2,129,400 1,729,400
Fair Value Asset    
Derivative Fair Value Of Derivative Asset 71,893 109,855
Fair Value Liability    
Derivative Fair Value Of Derivative Liability 104,539 22,930
Forward Contracts Member
   
Notional Value    
Non-Qualifying Hedge Relationships 752 5,424
Fair Value Asset    
Derivative Fair Value Of Derivative Asset 2 48
Fair Value Liability    
Derivative Fair Value Of Derivative Liability 0 0
Currency Swap Member | Designated as Hedging Instrument [Member]
   
Notional Value    
Qualifying Hedge Relationships 171,034 145,174
Fair Value Asset    
Derivative Fair Value Of Derivative Asset 8,114 4,152
Fair Value Liability    
Derivative Fair Value Of Derivative Liability 2,195 3,904
Currency Swap Member | Nondesignated [Member]
   
Notional Value    
Non-Qualifying Hedge Relationships 84,968 62,468
Fair Value Asset    
Derivative Fair Value Of Derivative Asset 1,800 1,516
Fair Value Liability    
Derivative Fair Value Of Derivative Liability 890 2,064
Credit Default Swap Member
   
Notional Value    
Non-Qualifying Hedge Relationships 14,275 14,275
Fair Value Asset    
Derivative Fair Value Of Derivative Asset 93 614
Fair Value Liability    
Derivative Fair Value Of Derivative Liability 775 894
Equity Futures [Member]
   
Notional Value    
Non-Qualifying Hedge Relationships 336,451 320,377
Fair Value Asset    
Derivative Fair Value Of Derivative Asset 3,725 762
Fair Value Liability    
Derivative Fair Value Of Derivative Liability 1,652 6,073
Equity Options [Member]
   
Notional Value    
Non-Qualifying Hedge Relationships 24,013,015 24,243,020
Fair Value Asset    
Derivative Fair Value Of Derivative Asset 25,464 70,669
Fair Value Liability    
Derivative Fair Value Of Derivative Liability $ 10,392 $ 32,824
[1] Excludes embedded derivatives which contain multiple underlyings. The fair value of these embedded derivatives was an asset of $344 million and a liability of $1,441 million as of June 30, 2013 and December 31, 2012, respectively, included in “Future policy benefits” and “Fixed maturities, available-for-sale.”