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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

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