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Fair Values of Financial Instruments (Assets and Liabilities Measured on a Recurring Basis by Fair Value Hierarchy) (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Assets    
Derivative instruments $ 642,413 $ 1,277,480
Fair Value, Measurements, Recurring    
Assets    
Real estate investments 510,188 337,939
Derivative instruments 642,413 1,277,480
Cash and cash equivalents 1,933,899 4,508,982
Assets 52,777,923 57,442,570
Liabilities    
Liabilities 6,566,109 7,962,599
Fair Value, Measurements, Recurring | United States Government Full Faith and Credit    
Assets    
Investments 38,666 37,793
Fair Value, Measurements, Recurring | United States Government Sponsored Agencies    
Assets    
Investments 174,845 1,040,953
Fair Value, Measurements, Recurring | United States Municipalities, States and Territories    
Assets    
Investments 3,812,510 3,927,201
Fair Value, Measurements, Recurring | Foreign Government Obligations    
Assets    
Investments 405,166 402,545
Fair Value, Measurements, Recurring | Corporate Securities    
Assets    
Investments 33,873,527 34,660,234
Fair Value, Measurements, Recurring | Residential Mortgage Backed Securities    
Assets    
Investments 1,210,559 1,125,049
Fair Value, Measurements, Recurring | Commercial Mortgage Backed Securities    
Assets    
Investments 4,769,867 4,840,311
Fair Value, Measurements, Recurring | Other Asset Backed Securities    
Assets    
Investments 5,376,980 5,271,857
Fair Value, Measurements, Recurring | Equity Securities    
Assets    
Investments 29,303 12,226
Fair Value, Measurements, Recurring | Reinsurance Related Embedded Derivative    
Liabilities    
Derivative liabilities (204,806) (2,362)
Fair Value, Measurements, Recurring | Fixed Index Annuities - Embedded Derivatives    
Liabilities    
Derivative liabilities 6,770,915 7,964,961
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets (Level 1)    
Assets    
Real estate investments 0 0
Derivative instruments 0 0
Cash and cash equivalents 1,933,899 4,508,982
Assets 1,999,248 4,574,419
Liabilities    
Liabilities 0 0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets (Level 1) | United States Government Full Faith and Credit    
Assets    
Investments 33,850 32,737
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets (Level 1) | United States Government Sponsored Agencies    
Assets    
Investments 0 0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets (Level 1) | United States Municipalities, States and Territories    
Assets    
Investments 0 0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets (Level 1) | Foreign Government Obligations    
Assets    
Investments 0 0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets (Level 1) | Corporate Securities    
Assets    
Investments 31,499 32,700
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets (Level 1) | Residential Mortgage Backed Securities    
Assets    
Investments 0 0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets (Level 1) | Commercial Mortgage Backed Securities    
Assets    
Investments 0 0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets (Level 1) | Other Asset Backed Securities    
Assets    
Investments 0 0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets (Level 1) | Equity Securities    
Assets    
Investments 0 0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets (Level 1) | Reinsurance Related Embedded Derivative    
Liabilities    
Derivative liabilities 0 0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets (Level 1) | Fixed Index Annuities - Embedded Derivatives    
Liabilities    
Derivative liabilities 0 0
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2)    
Assets    
Real estate investments 0 0
Derivative instruments 642,413 1,277,480
Cash and cash equivalents 0 0
Assets 50,264,620 52,523,863
Liabilities    
Liabilities (204,806) (2,362)
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | United States Government Full Faith and Credit    
Assets    
Investments 4,816 5,056
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | United States Government Sponsored Agencies    
Assets    
Investments 174,845 1,040,953
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | United States Municipalities, States and Territories    
Assets    
Investments 3,812,510 3,927,201
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Foreign Government Obligations    
Assets    
Investments 405,166 402,545
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Corporate Securities    
Assets    
Investments 33,842,028 34,627,534
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Residential Mortgage Backed Securities    
Assets    
Investments 1,210,559 1,125,049
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Commercial Mortgage Backed Securities    
Assets    
Investments 4,769,867 4,840,311
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Other Asset Backed Securities    
Assets    
Investments 5,376,980 5,271,857
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Equity Securities    
Assets    
Investments 25,436 5,877
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Reinsurance Related Embedded Derivative    
Liabilities    
Derivative liabilities (204,806) (2,362)
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Fixed Index Annuities - Embedded Derivatives    
Liabilities    
Derivative liabilities 0 0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3)    
Assets    
Real estate investments 510,188 337,939
Derivative instruments 0 0
Cash and cash equivalents 0 0
Assets 514,055 344,288
Liabilities    
Liabilities 6,770,915 7,964,961
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | United States Government Full Faith and Credit    
Assets    
Investments 0 0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | United States Government Sponsored Agencies    
Assets    
Investments 0 0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | United States Municipalities, States and Territories    
Assets    
Investments 0 0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Foreign Government Obligations    
Assets    
Investments 0 0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Corporate Securities    
Assets    
Investments 0 0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Residential Mortgage Backed Securities    
Assets    
Investments 0 0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Commercial Mortgage Backed Securities    
Assets    
Investments 0 0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Other Asset Backed Securities    
Assets    
Investments 0 0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Equity Securities    
Assets    
Investments 3,867 6,349
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Reinsurance Related Embedded Derivative    
Liabilities    
Derivative liabilities 0 0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Fixed Index Annuities - Embedded Derivatives    
Liabilities    
Derivative liabilities $ 6,770,915 $ 7,964,961