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Reinsurance and Policy Provisions (North End Re) (Details)
$ in Thousands
 6 Months Ended 12 Months Ended
Dec. 31, 2021
USD ($)
Basis_Points
yearOfAgreement
Dec. 31, 2021
USD ($)
Basis_Points
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Oct. 08, 2021
USD ($)
Jul. 01, 2021
USD ($)
Ceded Credit Risk [Line Items]            
Other revenue   $ 15,670 $ 0 $ 0    
Other liabilities (2021 includes $20,168 related to consolidated variable interest entities) $ 2,079,977 2,079,977 1,668,025      
Coinsurance deposits (net of allowance for credit losses of $2,264 as of 2021 and $1,888 as of 2020) $ 8,850,608 $ 8,850,608 $ 4,844,927      
Third party ownership interest in Company's common stock 9.80% 9.80%        
Other Income, Asset Liability Management Fee            
Ceded Credit Risk [Line Items]            
Other revenue   $ 5,500        
Other Income, Deferred Gain            
Ceded Credit Risk [Line Items]            
Other revenue   $ 10,200        
North End Re, Reinsurance Agreement, In Force as of July 1, 2021            
Ceded Credit Risk [Line Items]            
Reinsurance liabilities, amount ceded           $ 4,300,000
Modified coinsurance basis, percentage 70.00%          
Coinsurance basis, percentage 30.00%          
Annual ceding commission, basis points | Basis_Points 49 49        
Annual asset liability management fee, basis points | Basis_Points 30 30        
Contractually guaranteed fees, duration 6 years          
Fees contingent on certain performance obligations, agreement year | yearOfAgreement 7          
Ceding commission, initial net present value $ 114,100          
North End Re, Reinsurance Agreement, In Force as of July 1, 2021 | North End Re, Reinsurance Agreement, Modified Coinsurance Basis            
Ceded Credit Risk [Line Items]            
Cash transferred at close of reinsurance agreement         $ 2,600,000  
North End Re, Reinsurance Agreement, In Force as of July 1, 2021 | North End Re, Reinsurance Agreement, Coinsurance Basis            
Ceded Credit Risk [Line Items]            
Cash transferred at close of reinsurance agreement         $ 1,100,000  
North End Re, Reinsurance Agreement, July 1, 2021 Going Forward            
Ceded Credit Risk [Line Items]            
Modified coinsurance basis, percentage 70.00%          
Coinsurance basis, percentage 30.00%          
Annual ceding commission, basis points | Basis_Points 140 140        
Annual asset liability management fee, basis points | Basis_Points 30 30        
Contractually guaranteed fees, duration 6 years          
Fees contingent on certain performance obligations, agreement year | yearOfAgreement 7          
Ceding commission, initial net present value $ 27,100          
Coninsurance on certain annuities, percentage 75.00%          
North End Re            
Ceded Credit Risk [Line Items]            
Other liabilities (2021 includes $20,168 related to consolidated variable interest entities) $ 321,700 $ 321,700        
Coinsurance deposits (net of allowance for credit losses of $2,264 as of 2021 and $1,888 as of 2020) 4,600,000 4,600,000        
Reinsurance payable $ 127,900 $ 127,900