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Derivative Instruments (Gross Notional Amount and Fair Value of Derivatives Contracts) (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2019
Dec. 31, 2018
Derivative [Line Items]    
Document Period End Date Sep. 30, 2019  
Notional Amount $ 20,355,622 $ 19,884,691
Carrying Value / Fair Value of Assets 358,455 356,666
Derivative Liability, Fair Value, Gross Liability 1,080,720 990,895
Not Designated as Hedging Instrument    
Derivative [Line Items]    
Notional Amount 18,528,881 18,044,033
Carrying Value / Fair Value of Assets 288,630 254,381
Derivative Liability, Fair Value, Gross Liability 1,038,638 963,638
Not Designated as Hedging Instrument | Interest Rate Swap [Member]    
Derivative [Line Items]    
Notional Amount 929,963 1,040,588
Carrying Value / Fair Value of Assets 84,306 47,652
Derivative Liability, Fair Value, Gross Liability 2,778 961
Not Designated as Hedging Instrument | Financial Futures    
Derivative [Line Items]    
Notional Amount 361,030 325,620
Carrying Value / Fair Value of Assets 0 0
Derivative Liability, Fair Value, Gross Liability 0 0
Not Designated as Hedging Instrument | Foreign Currency Forwards    
Derivative [Line Items]    
Notional Amount 125,000 25,000
Carrying Value / Fair Value of Assets 337 0
Derivative Liability, Fair Value, Gross Liability 0 234
Not Designated as Hedging Instrument | Consumer Price Index Swap [Member]    
Derivative [Line Items]    
Notional Amount 422,068 385,580
Carrying Value / Fair Value of Assets 360 0
Derivative Liability, Fair Value, Gross Liability 33,245 11,384
Not Designated as Hedging Instrument | Credit Default Swaps    
Derivative [Line Items]    
Notional Amount 1,337,800 1,338,300
Carrying Value / Fair Value of Assets 5,888 6,003
Derivative Liability, Fair Value, Gross Liability 139 1,166
Not Designated as Hedging Instrument | Equity Options    
Derivative [Line Items]    
Notional Amount 386,536 439,158
Carrying Value / Fair Value of Assets 24,844 42,836
Derivative Liability, Fair Value, Gross Liability 0 0
Not Designated as Hedging Instrument | Longevity Swap [Member]    
Derivative [Line Items]    
Notional Amount 871,920 917,360
Carrying Value / Fair Value of Assets 51,620 47,789
Derivative Liability, Fair Value, Gross Liability 0 0
Not Designated as Hedging Instrument | Mortality Swap [Member]    
Derivative [Line Items]    
Notional Amount 25,000 25,000
Carrying Value / Fair Value of Assets 0 0
Derivative Liability, Fair Value, Gross Liability 853 369
Not Designated as Hedging Instrument | Currency Swap [Member]    
Derivative [Line Items]    
Notional Amount 149,698 149,698
Carrying Value / Fair Value of Assets 0 504
Derivative Liability, Fair Value, Gross Liability 12,454 4,659
Not Designated as Hedging Instrument | Embedded Derivatives In Modified Coinsurance Or Funds Withheld Arrangements    
Derivative [Line Items]    
Notional Amount 0 0
Carrying Value / Fair Value of Assets 121,275 109,597
Derivative Liability, Fair Value, Gross Liability 0 0
Not Designated as Hedging Instrument | Embedded Derivatives In Indexed Annuity [Member]    
Derivative [Line Items]    
Notional Amount 0 0
Carrying Value / Fair Value of Assets 0 0
Derivative Liability, Fair Value, Gross Liability 779,128 776,940
Not Designated as Hedging Instrument | Embedded Derivatives In Variable Annuity [Member]    
Derivative [Line Items]    
Notional Amount 0 0
Carrying Value / Fair Value of Assets 0 0
Derivative Liability, Fair Value, Gross Liability 210,041 167,925
Not Designated as Hedging Instrument | Synthetic Guaranteed Investment Contracts    
Derivative [Line Items]    
Notional Amount 13,919,866 13,397,729
Carrying Value / Fair Value of Assets 0 0
Derivative Liability, Fair Value, Gross Liability 0 0
Designated As Hedging Instrument    
Derivative [Line Items]    
Notional Amount 1,826,741 1,840,658
Carrying Value / Fair Value of Assets 69,825 102,285
Derivative Liability, Fair Value, Gross Liability 42,082 27,257
Designated As Hedging Instrument | Interest Rate Swap [Member]    
Derivative [Line Items]    
Notional Amount 435,000 435,000
Carrying Value / Fair Value of Assets 0 0
Derivative Liability, Fair Value, Gross Liability 34,467 27,257
Designated As Hedging Instrument | Foreign Currency Forwards    
Derivative [Line Items]    
Notional Amount 1,025,548 911,197
Carrying Value / Fair Value of Assets 43,441 50,974
Derivative Liability, Fair Value, Gross Liability 0 0
Designated As Hedging Instrument | Currency Swap [Member]    
Derivative [Line Items]    
Notional Amount 366,193 494,461
Carrying Value / Fair Value of Assets 26,384 51,311
Derivative Liability, Fair Value, Gross Liability $ 7,615 $ 0