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Fair Value of Assets and Liabilities (Quantitative Info for Level 3 Inputs) (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Future policy benefits $ 310,817 $ 293,527
Fair Value, Measurements, Recurring    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Future policy benefits 27,935 12,831
Policyholders' account balances $ 1,206 1,316
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 $ 27,935 12,831
Policyholders' account balances $ 1,206 $ 1,316
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 6.00% 6.00%
Level 3 | Internal | Minimum | Discounted cash flow | Corporate securities    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Discount rate 0.48% 0.49%
Level 3 | Internal | Minimum | Discounted cash flow | Equity securities    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Discount rate 10.00% 10.00%
Level 3 | Internal | Minimum | Discounted cash flow | Separate accounts commercial mortgage loan    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Spread 2.44% 1.11%
Level 3 | Internal | Minimum | Market comparables | Corporate securities    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
EBITDA multiples 5.7 5.7
Level 3 | Internal | Minimum | Market comparables | Equity securities    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
EBITDA multiples 1 1
Level 3 | Internal | Minimum | Liquidation | Corporate securities    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Liquidation value 14.12% 14.25%
Level 3 | Internal | Minimum | Net asset value | Equity securities    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Share price 1 5
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 42.00% 42.00%
Spread over LIBOR 2.02% 1.23%
Mortality rate 24.00% 24.00%
Equity volatility curve 53.00% 25.00%
Level 3 | Internal | Maximum | Discounted cash flow | Corporate securities    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Discount rate 25.00% 20.00%
Level 3 | Internal | Maximum | Discounted cash flow | Equity securities    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Discount rate 30.00% 30.00%
Level 3 | Internal | Maximum | Discounted cash flow | Separate accounts commercial mortgage loan    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Spread 3.59% 1.85%
Level 3 | Internal | Maximum | Market comparables | Corporate securities    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
EBITDA multiples 9.2 9.2
Level 3 | Internal | Maximum | Market comparables | Equity securities    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
EBITDA multiples 9.8 10.1
Level 3 | Internal | Maximum | Liquidation | Corporate securities    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Liquidation value 74.63% 83.61%
Level 3 | Internal | Maximum | Net asset value | Equity securities    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Share price 1,353 1,353
Level 3 | Internal | Weighted Average | Discounted cash flow | Corporate securities    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Discount rate 6.61% 7.41%
Level 3 | Internal | Weighted Average | Discounted cash flow | Separate accounts commercial mortgage loan    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Spread 2.65% 1.26%
Level 3 | Internal | Weighted Average | Market comparables | Corporate securities    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
EBITDA multiples 7.1 7.3
Level 3 | Internal | Weighted Average | Market comparables | Equity securities    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
EBITDA multiples 5.0 5.4
Level 3 | Internal | Weighted Average | Liquidation | Corporate securities    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Liquidation value 54.70% 59.47%
Level 3 | Internal | Weighted Average | Net asset value | Equity securities    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Share price 723 451
Level 3 | Internal | Fair Value, Measurements, Recurring | Future policy benefits    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Future policy benefits $ 27,935 $ 12,831
Level 3 | Internal | Fair Value, Measurements, Recurring | Policyholders' account balances    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Policyholders' account balances 1,206 1,316
Level 3 | Internal | Fair Value, Measurements, Recurring | Corporate securities    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Corporate securities 2,929 1,424
Level 3 | Internal | Fair Value, Measurements, Recurring | Equity securities    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Equity securities 187 210
Level 3 | Internal | Fair Value, Measurements, Recurring | Separate accounts commercial mortgage loan    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Commercial mortgage loans $ 773 $ 796