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Fair Values of Financial Instruments (Assumptions Used in Estimating Fair Value) (Details)
3 Months Ended 12 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]    
Expected cost of annual call options 2.90% 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 0.93% 0.90%
Average partial withdrawal rates 3.37% 3.33%
Fixed Index Annuities | Average | Contract Duration (Years), 6-10    
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]    
Average lapse rates 1.29% 1.29%
Average partial withdrawal rates 3.87% 3.84%
Fixed Index Annuities | Average | Contract Duration (Years), 11-15    
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]    
Average lapse rates 3.27% 3.31%
Average partial withdrawal rates 4.13% 4.12%
Fixed Index Annuities | Average | Contract Duration (Years), 16-20    
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]    
Average lapse rates 7.83% 8.52%
Average partial withdrawal rates 4.19% 4.18%
Fixed Index Annuities | Average | Contract Duration (Years), 20 or More    
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]    
Average lapse rates 7.21% 7.10%
Average partial withdrawal rates 4.14% 4.12%