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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, 2023
Dec. 31, 2022
Assets    
Derivative instruments $ 733,784 $ 431,727 [1]
Market risk benefits 346,515 229,871 [1]
Liabilities    
Market risk benefits 2,552,907 2,455,492 [1]
Fair Value, Measurements, Recurring    
Assets    
Real estate investments 1,191,255 940,559
Limited partnerships and limited liability companies 1,172,525 684,835
Derivative instruments 733,784 431,727
Cash and cash equivalents 10,188,438 1,919,669
Market risk benefits 346,515 229,871
Assets 46,441,672 45,024,575
Liabilities    
Market risk benefits 2,552,907 2,455,492
Liabilities 6,631,138 6,834,473
Fair Value, Measurements, Recurring | U.S. Government and agencies    
Assets    
Investments 162,885 169,071
Fair Value, Measurements, Recurring | States, municipalities and territories    
Assets    
Investments 2,564,670 3,822,982
Fair Value, Measurements, Recurring | Foreign corporate securities and foreign governments    
Assets    
Investments 428,227 676,852
Fair Value, Measurements, Recurring | Corporate securities    
Assets    
Investments 19,211,380 24,161,921
Fair Value, Measurements, Recurring | Residential mortgage backed securities    
Assets    
Investments 1,342,984 1,377,611
Fair Value, Measurements, Recurring | Commercial Mortgage-Backed Securities [Member]    
Assets    
Investments 2,983,030 3,687,478
Fair Value, Measurements, Recurring | Other asset backed securities    
Assets    
Investments 5,391,756 5,908,702
Fair Value, Measurements, Recurring | Other investments    
Assets    
Investments 724,223 1,013,297
Fair Value, Measurements, Recurring | Funds withheld liability - embedded derivative    
Liabilities    
Derivative liabilities (525,960) (441,864)
Fair Value, Measurements, Recurring | Fixed index annuities - embedded derivatives    
Liabilities    
Derivative liabilities 4,604,191 4,820,845
Fair Value, Measurements, Recurring | NAV    
Assets    
Real estate investments 0 0
Limited partnerships and limited liability companies 1,023,691 620,626
Derivative instruments 0 0
Cash and cash equivalents 0 0
Market risk benefits 0 0
Assets 1,023,691 620,626
Liabilities    
Market risk benefits 0 0
Liabilities 0 0
Fair Value, Measurements, Recurring | NAV | U.S. Government and agencies    
Assets    
Investments 0 0
Fair Value, Measurements, Recurring | NAV | States, municipalities and territories    
Assets    
Investments 0 0
Fair Value, Measurements, Recurring | NAV | Foreign corporate securities and foreign governments    
Assets    
Investments 0 0
Fair Value, Measurements, Recurring | NAV | Corporate securities    
Assets    
Investments 0 0
Fair Value, Measurements, Recurring | NAV | Residential mortgage backed securities    
Assets    
Investments 0 0
Fair Value, Measurements, Recurring | NAV | Commercial Mortgage-Backed Securities [Member]    
Assets    
Investments 0 0
Fair Value, Measurements, Recurring | NAV | Other asset backed securities    
Assets    
Investments 0 0
Fair Value, Measurements, Recurring | NAV | Other investments    
Assets    
Investments 0 0
Fair Value, Measurements, Recurring | NAV | Funds withheld liability - embedded derivative    
Liabilities    
Derivative liabilities 0 0
Fair Value, Measurements, Recurring | NAV | Fixed index annuities - embedded derivatives    
Liabilities    
Derivative liabilities 0 0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets (Level 1)    
Assets    
Real estate investments 0 0
Limited partnerships and limited liability companies 0 0
Derivative instruments 0 0
Cash and cash equivalents 10,188,438 1,919,669
Market risk benefits 0 0
Assets 10,606,429 2,344,133
Liabilities    
Market risk benefits 0 0
Liabilities 0 0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets (Level 1) | U.S. Government and agencies    
Assets    
Investments 27,068 26,184
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 0
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 [Member]    
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 390,923 398,280
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
Limited partnerships and limited liability companies 0 0
Derivative instruments 733,784 431,727
Cash and cash equivalents 0 0
Market risk benefits 0 0
Assets 31,998,174 39,979,911
Liabilities    
Market risk benefits 0 0
Liabilities 0 0
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | U.S. Government and agencies    
Assets    
Investments 135,817 142,887
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | States, municipalities and territories    
Assets    
Investments 2,442,796 3,822,982
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Foreign corporate securities and foreign governments    
Assets    
Investments 428,227 676,852
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Corporate securities    
Assets    
Investments 18,959,540 23,759,573
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Residential mortgage backed securities    
Assets    
Investments 1,342,984 1,377,611
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Commercial Mortgage-Backed Securities [Member]    
Assets    
Investments 2,983,030 3,687,478
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Other asset backed securities    
Assets    
Investments 4,638,696 5,465,784
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Other investments    
Assets    
Investments 333,300 615,017
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Funds withheld liability - embedded derivative    
Liabilities    
Derivative liabilities 0 0
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 1,191,255 940,559
Limited partnerships and limited liability companies 148,834 64,209
Derivative instruments 0 0
Cash and cash equivalents 0 0
Market risk benefits 346,515 229,871
Assets 2,813,378 2,079,905
Liabilities    
Market risk benefits 2,552,907 2,455,492
Liabilities 6,631,138 6,834,473
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 121,874 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 251,840 402,348
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 [Member]    
Assets    
Investments 0 0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Other asset backed securities    
Assets    
Investments 753,060 442,918
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Other investments    
Assets    
Investments 0 0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Funds withheld liability - embedded derivative    
Liabilities    
Derivative liabilities (525,960) (441,864)
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Fixed index annuities - embedded derivatives    
Liabilities    
Derivative liabilities $ 4,604,191 $ 4,820,845
[1] Certain prior period amounts have been recast. See Note 1 - Significant Accounting Policies for more information.