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Derivative Instruments (Gross Notional Amount and Fair Value of Derivatives Contracts) (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Notional Value    
Total Derivatives $ 11,910,518 $ 5,260,160
Fair Value Asset    
Total Derivatives 215,587 192,112
Fair Value Liability    
Total Derivatives 37,179 40,012
Designated as Hedging Instrument [Member]
   
Notional Value    
Qualifying Hedge Relationships 55,053 47,702
Fair Value Asset    
Derivative Fair Value Of Derivative Asset 1,267 867
Fair Value Liability    
Derivative Fair Value Of Derivative Liability 1,191 1,796
Not Designated as Hedging Instrument [Member]
   
Notional Value    
Non-Qualifying Hedge Relationships 11,855,465 5,212,458
Fair Value Asset    
Derivative Fair Value Of Derivative Asset 214,320 191,245
Fair Value Liability    
Derivative Fair Value Of Derivative Liability 35,988 38,216
Interest Rate Swap Member
   
Notional Value    
Non-Qualifying Hedge Relationships 1,767,950 1,752,950
Fair Value Asset    
Derivative Fair Value Of Derivative Asset 171,984 162,428
Fair Value Liability    
Derivative Fair Value Of Derivative Liability 8,183 8,546
Currency Swap Member
   
Notional Value    
Non-Qualifying Hedge Relationships 64,146 62,280
Fair Value Asset    
Derivative Fair Value Of Derivative Asset 3,444 2,852
Fair Value Liability    
Derivative Fair Value Of Derivative Liability 3,212 4,975
Currency Swap Member | Designated as Hedging Instrument [Member]
   
Notional Value    
Qualifying Hedge Relationships 55,053 47,702
Fair Value Asset    
Derivative Fair Value Of Derivative Asset 1,267 867
Fair Value Liability    
Derivative Fair Value Of Derivative Liability 1,191 1,796
Credit Default Swap Member
   
Notional Value    
Non-Qualifying Hedge Relationships 345,050 399,050
Fair Value Asset    
Derivative Fair Value Of Derivative Asset 1,129 1,737
Fair Value Liability    
Derivative Fair Value Of Derivative Liability 1,760 2,165
Equity Futures [Member]
   
Notional Value    
Non-Qualifying Hedge Relationships 213,869 199,446
Fair Value Asset    
Derivative Fair Value Of Derivative Asset 2,261 1,067
Fair Value Liability    
Derivative Fair Value Of Derivative Liability 4,090 4,838
Equity Options [Member]
   
Notional Value    
Non-Qualifying Hedge Relationships 9,464,450 2,798,732
Fair Value Asset    
Derivative Fair Value Of Derivative Asset 35,502 23,161
Fair Value Liability    
Derivative Fair Value Of Derivative Liability $ 18,743 $ 17,692