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Derivative Instruments (Gross Notional Amount and Fair Value of Derivatives Contracts) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Notional Value    
Total Derivatives $ 10,959,486 $ 5,260,160
Fair Value Asset    
Total Derivatives 174,087 192,112
Fair Value Liability    
Total Derivatives 42,352 40,012
Designated as Hedging Instrument [Member]
   
Notional Value    
Qualifying Hedge Relationships 65,612 47,702
Fair Value Asset    
Derivative Fair Value Of Derivative Asset 192 867
Fair Value Liability    
Derivative Fair Value Of Derivative Liability 3,309 1,796
Nondesignated [Member]
   
Notional Value    
Non-Qualifying Hedge Relationships 10,893,874 5,212,458
Fair Value Asset    
Derivative Fair Value Of Derivative Asset 173,895 191,245
Fair Value Liability    
Derivative Fair Value Of Derivative Liability 39,043 38,216
Interest Rate Swap Member | Nondesignated [Member]
   
Notional Value    
Non-Qualifying Hedge Relationships 2,332,950 1,652,950
Fair Value Asset    
Derivative Fair Value Of Derivative Asset 139,258 145,380
Fair Value Liability    
Derivative Fair Value Of Derivative Liability 24,075 8,546
Currency Swap Member | Designated as Hedging Instrument [Member]
   
Notional Value    
Qualifying Hedge Relationships 65,612 47,702
Fair Value Asset    
Derivative Fair Value Of Derivative Asset 192 867
Fair Value Liability    
Derivative Fair Value Of Derivative Liability 3,309 1,796
Currency Swap Member | Nondesignated [Member]
   
Notional Value    
Non-Qualifying Hedge Relationships 61,126 62,280
Fair Value Asset    
Derivative Fair Value Of Derivative Asset 1,715 2,852
Fair Value Liability    
Derivative Fair Value Of Derivative Liability 2,894 4,975
Credit Default Swap Member | Nondesignated [Member]
   
Notional Value    
Non-Qualifying Hedge Relationships 345,050 399,050
Fair Value Asset    
Derivative Fair Value Of Derivative Asset 411 1,737
Fair Value Liability    
Derivative Fair Value Of Derivative Liability 1,413 2,165
Equity Futures [Member] | Nondesignated [Member]
   
Notional Value    
Non-Qualifying Hedge Relationships 253,766 199,446
Fair Value Asset    
Derivative Fair Value Of Derivative Asset 193 1,067
Fair Value Liability    
Derivative Fair Value Of Derivative Liability 3,741 4,838
Equity Options [Member] | Nondesignated [Member]
   
Notional Value    
Non-Qualifying Hedge Relationships 7,800,982 2,798,732
Fair Value Asset    
Derivative Fair Value Of Derivative Asset 16,988 23,161
Fair Value Liability    
Derivative Fair Value Of Derivative Liability 6,920 17,692
InterestRateOption [Member] | Nondesignated [Member]
   
Notional Value    
Non-Qualifying Hedge Relationships 100,000 100,000
Fair Value Asset    
Derivative Fair Value Of Derivative Asset 15,330 17,048
Fair Value Liability    
Derivative Fair Value Of Derivative Liability $ 0 $ 0