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Fair Value of Assets and Liabilities (Quantitative Info for Level 3 Inputs) (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Corporate securities $ 6,360 $ 6,360
Future policy benefits 37,547,367 [1] 25,258,673
Fair Value, Measurements, Recurring    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Future policy benefits 20,196,457 8,529,566
Policyholders’ account balances $ 900,261 962,351
Level 3 | Minimum    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Fair Value Inputs, Policyholder Age 45 years  
Level 3 | Minimum | Future policy benefits    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Mortality rate 0.00%  
Level 3 | Maximum    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Fair Value Inputs, Policyholder Age 90 years  
Level 3 | Fair Value, Measurements, Recurring    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Future policy benefits $ 20,196,457 8,529,566
Policyholders’ account balances $ 900,261 $ 962,351
Level 3 | Internal | Minimum | Discounted cash flow | Future policy benefits    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Lapse rate 1.00% 1.00%
Spread over LIBOR 1.40% 0.10%
Utilization rate 43.00% 43.00%
Withdrawal rate (greater than maximum range) 78.00% 78.00%
Mortality rate 0.00% 0.00%
Equity volatility curve 18.00% 13.00%
Level 3 | Internal | Minimum | Discounted cash flow | Policyholders' account balances    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Lapse rate 1.00% 1.00%
Spread over LIBOR 1.40% 0.10%
Mortality rate 0.00% 0.00%
Equity volatility curve 25.00% 10.00%
Level 3 | Internal | Minimum | Discounted cash flow | Corporate securities    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Discount Rate 1.90% 5.24%
Level 3 | Internal | Minimum | Market comparables | Corporate securities    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
EBITDA 5.7 5.7
Level 3 | Internal | Maximum | Discounted cash flow | Future policy benefits    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Lapse rate 18.00% 18.00%
Spread over LIBOR 2.02% 1.23%
Utilization rate 97.00% 97.00%
Withdrawal rate (greater than maximum range) 100.00% 100.00%
Mortality rate 15.00% 15.00%
Equity volatility curve 33.00% 23.00%
Level 3 | Internal | Maximum | Discounted cash flow | Policyholders' account balances    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Lapse rate 6.00% 6.00%
Spread over LIBOR 2.02% 1.23%
Mortality rate 24.00% 24.00%
Equity volatility curve 50.00% 23.00%
Level 3 | Internal | Maximum | Discounted cash flow | Corporate securities    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Discount Rate 25.00% 17.47%
Level 3 | Internal | Maximum | Market comparables | Corporate securities    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
EBITDA 5.7 5.7
Level 3 | Internal | Weighted Average | Discounted cash flow | Corporate securities    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Discount Rate 5.05% 8.25%
Level 3 | Internal | Weighted Average | Market comparables | Corporate securities    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
EBITDA 5.7 5.7
Level 3 | Internal | Fair Value, Measurements, Recurring | Future policy benefits    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Future policy benefits $ 20,196,457 $ 8,529,566
Level 3 | Internal | Fair Value, Measurements, Recurring | Policyholders' account balances    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Policyholders’ account balances 900,261 962,351
Level 3 | Internal | Fair Value, Measurements, Recurring | Corporate securities    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Corporate securities 116,745 27,816
Level 3 | Internal | Fair Value, Measurements, Recurring | Reinsurance recoverables    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Reinsurance recoverables $ 20,214,824 $ 8,539,671
[1] March 31, 2020 amounts include the impacts of the January 1, 2020 adoption of ASU 2016-13. See Note 2 for details.