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Derivative Instruments (Gross Notional Amount and Fair Value of Derivatives Contracts) (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Notional Value    
Total Derivatives $ 12,330,561 $ 5,260,160
Fair Value Asset    
Total Derivatives 197,190 192,112
Fair Value Liability    
Total Derivatives 32,203 40,012
Designated as Hedging Instrument [Member]
   
Notional Value    
Qualifying Hedge Relationships 63,165 47,702
Fair Value Asset    
Derivative Fair Value Of Derivative Asset 947 867
Fair Value Liability    
Derivative Fair Value Of Derivative Liability 2,417 1,796
Nondesignated [Member]
   
Notional Value    
Non-Qualifying Hedge Relationships 12,267,396 5,212,458
Fair Value Asset    
Derivative Fair Value Of Derivative Asset 196,243 191,245
Fair Value Liability    
Derivative Fair Value Of Derivative Liability 29,786 38,216
Interest Rate Swap Member
   
Notional Value    
Non-Qualifying Hedge Relationships 2,132,950 1,752,950
Fair Value Asset    
Derivative Fair Value Of Derivative Asset 172,636 162,428
Fair Value Liability    
Derivative Fair Value Of Derivative Liability 13,660 8,546
Currency Swap Member
   
Notional Value    
Non-Qualifying Hedge Relationships 55,861 62,280
Fair Value Asset    
Derivative Fair Value Of Derivative Asset 2,951 2,852
Fair Value Liability    
Derivative Fair Value Of Derivative Liability 4,321 4,975
Currency Swap Member | Designated as Hedging Instrument [Member]
   
Notional Value    
Qualifying Hedge Relationships 63,165 47,702
Fair Value Asset    
Derivative Fair Value Of Derivative Asset 947 867
Fair Value Liability    
Derivative Fair Value Of Derivative Liability 2,417 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 805 1,737
Fair Value Liability    
Derivative Fair Value Of Derivative Liability 1,650 2,165
Equity Futures [Member]
   
Notional Value    
Non-Qualifying Hedge Relationships 169,085 199,446
Fair Value Asset    
Derivative Fair Value Of Derivative Asset 1,069 1,067
Fair Value Liability    
Derivative Fair Value Of Derivative Liability 2,584 4,838
Equity Options [Member]
   
Notional Value    
Non-Qualifying Hedge Relationships 9,564,450 2,798,732
Fair Value Asset    
Derivative Fair Value Of Derivative Asset 18,782 23,161
Fair Value Liability    
Derivative Fair Value Of Derivative Liability $ 7,571 $ 17,692