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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
Sep. 30, 2022
Dec. 31, 2021
Assets    
Derivative instruments $ 196,656 $ 1,277,480
Fair Value, Measurements, Recurring    
Assets    
Real estate investments 897,673 337,939
Derivative instruments 196,656 1,277,480
Cash and cash equivalents 1,808,132 4,508,982
Assets 44,774,276 57,442,570
Liabilities    
Liabilities 4,736,584 7,962,599
Fair Value, Measurements, Recurring | U.S. Government and Agencies    
Assets    
Investments 169,538 1,078,746
Fair Value, Measurements, Recurring | States, Municipalities and Territories    
Assets    
Investments 4,042,890 3,927,201
Fair Value, Measurements, Recurring | Foreign Corporate Securities and Foreign Governments    
Assets    
Investments 859,063 402,545
Fair Value, Measurements, Recurring | Corporate Securities    
Assets    
Investments 26,894,108 34,660,234
Fair Value, Measurements, Recurring | Residential Mortgage Backed Securities    
Assets    
Investments 1,372,741 1,125,049
Fair Value, Measurements, Recurring | Commercial Mortgage Backed Securities    
Assets    
Investments 3,706,960 4,840,311
Fair Value, Measurements, Recurring | Other Asset Backed Securities    
Assets    
Investments 4,042,611 5,271,857
Fair Value, Measurements, Recurring | Other Investments    
Assets    
Investments 783,904 12,226
Fair Value, Measurements, Recurring | Funds Withheld Liability - Embedded Derivative    
Liabilities    
Derivative liabilities (520,458) (2,362)
Fair Value, Measurements, Recurring | Fixed Index Annuities - Embedded Derivatives    
Liabilities    
Derivative liabilities 5,257,042 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 1,808,132 4,508,982
Assets 1,839,210 4,574,419
Liabilities    
Liabilities 0 0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets (Level 1) | U.S. Government and Agencies    
Assets    
Investments 26,075 32,737
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets (Level 1) | States, Municipalities and Territories    
Assets    
Investments 0 0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets (Level 1) | Foreign Corporate Securities and Foreign Governments    
Assets    
Investments 0 0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets (Level 1) | Corporate Securities    
Assets    
Investments 0 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) | Other Investments    
Assets    
Investments 5,003 0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets (Level 1) | Funds Withheld Liability - 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 196,656 1,277,480
Cash and cash equivalents 0 0
Assets 41,619,616 52,523,863
Liabilities    
Liabilities 0 (2,362)
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | U.S. Government and Agencies    
Assets    
Investments 143,463 1,046,009
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | States, Municipalities and Territories    
Assets    
Investments 4,042,890 3,927,201
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Foreign Corporate Securities and Foreign Governments    
Assets    
Investments 859,063 402,545
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Corporate Securities    
Assets    
Investments 26,574,576 34,627,534
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Residential Mortgage Backed Securities    
Assets    
Investments 1,372,741 1,125,049
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Commercial Mortgage Backed Securities    
Assets    
Investments 3,706,960 4,840,311
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Other Asset Backed Securities    
Assets    
Investments 3,944,366 5,271,857
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Other Investments    
Assets    
Investments 778,901 5,877
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Funds Withheld Liability - Embedded Derivative    
Liabilities    
Derivative liabilities 0 (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 897,673 337,939
Derivative instruments 0 0
Cash and cash equivalents 0 0
Assets 1,315,450 344,288
Liabilities    
Liabilities 4,736,584 7,964,961
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | U.S. Government and Agencies    
Assets    
Investments 0 0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | States, Municipalities and Territories    
Assets    
Investments 0 0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Foreign Corporate Securities and Foreign Governments    
Assets    
Investments 0 0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Corporate Securities    
Assets    
Investments 319,532 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 98,245 0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Other Investments    
Assets    
Investments 0 6,349
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Funds Withheld Liability - Embedded Derivative    
Liabilities    
Derivative liabilities (520,458) 0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Fixed Index Annuities - Embedded Derivatives    
Liabilities    
Derivative liabilities $ 5,257,042 $ 7,964,961