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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, 2021
Dec. 31, 2020
Assets    
Derivative instruments $ 990,033 $ 1,310,954
Liabilities    
Equity method investments, fair value 277,400 179,700
COLI, fair value 380,900 373,600
Fair Value, Measurements, Recurring    
Assets    
Real estate investments 259,262  
Derivative instruments 990,033 1,310,954
Cash and cash equivalents 12,684,793 9,095,522
Assets 60,034,334 57,945,369
Liabilities    
Fixed index annuities - embedded derivatives 7,547,840 7,938,281
Fair Value, Measurements, Recurring | United States Government Full Faith and Credit    
Assets    
Investments 38,486 39,771
Fair Value, Measurements, Recurring | United States Government Sponsored Agencies    
Assets    
Investments 1,043,351 1,039,551
Fair Value, Measurements, Recurring | United States Municipalities, States and Territories    
Assets    
Investments 3,596,256 3,776,131
Fair Value, Measurements, Recurring | Foreign Government Obligations    
Assets    
Investments 195,341 202,706
Fair Value, Measurements, Recurring | Corporate Securities    
Assets    
Investments 31,021,887 31,156,827
Fair Value, Measurements, Recurring | Residential Mortgage Backed Securities    
Assets    
Investments 1,053,983 1,512,831
Fair Value, Measurements, Recurring | Commercial Mortgage Backed Securities    
Assets    
Investments 4,138,078 4,261,227
Fair Value, Measurements, Recurring | Other Asset Backed Securities    
Assets    
Investments 4,650,715 5,549,849
Fair Value, Measurements, Recurring | Equity Securities    
Assets    
Investments 362,149  
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets (Level 1)    
Assets    
Real estate investments 0  
Derivative instruments 0 0
Cash and cash equivalents 12,684,793 9,095,522
Assets 13,067,908 9,129,470
Liabilities    
Fixed index annuities - embedded derivatives 0 0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets (Level 1) | United States Government Full Faith and Credit    
Assets    
Investments 33,110 33,940
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 5 8
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 350,000  
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2)    
Assets    
Real estate investments 0  
Derivative instruments 990,033 1,310,954
Cash and cash equivalents 0 0
Assets 46,700,815 48,815,899
Liabilities    
Fixed index annuities - embedded derivatives 0 0
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | United States Government Full Faith and Credit    
Assets    
Investments 5,376 5,831
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | United States Government Sponsored Agencies    
Assets    
Investments 1,043,351 1,039,551
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | United States Municipalities, States and Territories    
Assets    
Investments 3,596,256 3,776,131
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Foreign Government Obligations    
Assets    
Investments 195,341 202,706
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Corporate Securities    
Assets    
Investments 31,021,882 31,156,819
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Residential Mortgage Backed Securities    
Assets    
Investments 1,053,983 1,512,831
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Commercial Mortgage Backed Securities    
Assets    
Investments 4,138,078 4,261,227
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Other Asset Backed Securities    
Assets    
Investments 4,650,715 5,549,849
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Equity Securities    
Assets    
Investments 5,800  
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3)    
Assets    
Real estate investments 259,262  
Derivative instruments 0 0
Cash and cash equivalents 0 0
Assets 265,611 0
Liabilities    
Fixed index annuities - embedded derivatives 7,547,840 7,938,281
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 $ 6,349