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Fair Values of Financial Instruments (Assumptions Used in Estimating Fair Value) (Details)
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]        
Expected cost of annual call options 2.40% 2.10% 2.10% 2.90%
Fixed Index Annuities | Minimum | Contract Duration (Years), 1-5        
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]        
Contract duration (years) 1 year 1 year    
Fixed Index Annuities | Minimum | Contract Duration (Years), 6-10        
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]        
Contract duration (years) 6 years 6 years    
Fixed Index Annuities | Minimum | Contract Duration (Years), 11-15        
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]        
Contract duration (years) 11 years 11 years    
Fixed Index Annuities | Minimum | Contract Duration (Years), 16-20        
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]        
Contract duration (years) 16 years 16 years    
Fixed Index Annuities | Minimum | Contract Duration (Years), 20 or More        
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]        
Contract duration (years) 20 years 20 years    
Fixed Index Annuities | Maximum | Contract Duration (Years), 1-5        
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]        
Contract duration (years) 5 years 5 years    
Fixed Index Annuities | Maximum | Contract Duration (Years), 6-10        
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]        
Contract duration (years) 10 years 10 years    
Fixed Index Annuities | Maximum | Contract Duration (Years), 11-15        
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]        
Contract duration (years) 15 years 15 years    
Fixed Index Annuities | Maximum | Contract Duration (Years), 16-20        
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]        
Contract duration (years) 20 years 20 years    
Fixed Index Annuities | Average | Contract Duration (Years), 1-5        
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]        
Average lapse rates 2.17% 3.04%    
Average partial withdrawal rates 1.86% 2.19%    
Fixed Index Annuities | Average | Contract Duration (Years), 6-10        
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]        
Average lapse rates 3.28% 2.84%    
Average partial withdrawal rates 1.97% 2.26%    
Fixed Index Annuities | Average | Contract Duration (Years), 11-15        
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]        
Average lapse rates 3.63% 4.47%    
Average partial withdrawal rates 1.86% 2.14%    
Fixed Index Annuities | Average | Contract Duration (Years), 16-20        
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]        
Average lapse rates 8.55% 8.93%    
Average partial withdrawal rates 2.96% 1.33%    
Fixed Index Annuities | Average | Contract Duration (Years), 20 or More        
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]        
Average lapse rates 4.90% 4.93%    
Average partial withdrawal rates 1.81% 0.00%