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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, 2021
Dec. 31, 2020
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Future policy benefits $ 290,536 $ 306,343
Fair Value, Measurements, Recurring    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Future policy benefits 11,314 18,879
Policyholders' account balances $ 2,171 1,914
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 $ 11,314 18,879
Policyholders' account balances $ 2,171 $ 1,914
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 0.09% 0.06%
Utilization rate 39.00% 39.00%
Withdrawal rate (greater than maximum range) 76.00% 76.00%
Mortality rate 0.00% 0.00%
Equity volatility curve 17.00% 18.00%
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 0.09% 0.06%
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 0.40% 0.40%
Level 3 | Internal | Minimum | Discounted cash flow | Equity securities    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Discount rate 0.50% 0.50%
Level 3 | Internal | Minimum | Discounted cash flow | Separate accounts commercial mortgage loan    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Spread 1.10% 1.60%
Level 3 | Internal | Minimum | Market comparables | Corporate securities    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
EBITDA multiples 7.3 7.0
Level 3 | Internal | Minimum | Market comparables | Equity securities    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
EBITDA multiples 0.1 1
Level 3 | Internal | Minimum | Liquidation | Corporate securities    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Liquidation value 12.86% 12.13%
Level 3 | Internal | Minimum | Net asset value | Equity securities    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Share price 12 1
Level 3 | Internal | Maximum | Discounted cash flow | Future policy benefits    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Lapse rate 20.00% 20.00%
Spread over LIBOR 1.14% 1.17%
Utilization rate 96.00% 96.00%
Withdrawal rate (greater than maximum range) 100.00% 100.00%
Mortality rate 15.00% 15.00%
Equity volatility curve 25.00% 26.00%
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 1.14% 1.17%
Mortality rate 24.00% 24.00%
Equity volatility curve 42.00% 42.00%
Level 3 | Internal | Maximum | Discounted cash flow | Corporate securities    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Discount rate 30.00% 25.00%
Level 3 | Internal | Maximum | Discounted cash flow | Equity securities    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Discount rate 20.00% 20.00%
Level 3 | Internal | Maximum | Discounted cash flow | Separate accounts commercial mortgage loan    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Spread 2.27% 2.98%
Level 3 | Internal | Maximum | Market comparables | Corporate securities    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
EBITDA multiples 15.0 15.0
Level 3 | Internal | Maximum | Market comparables | Equity securities    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
EBITDA multiples 7.3 8.8
Level 3 | Internal | Maximum | Liquidation | Corporate securities    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Liquidation value 71.23% 15.00%
Level 3 | Internal | Maximum | Net asset value | Equity securities    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Share price 1,414 1,414
Level 3 | Internal | Weighted Average | Discounted cash flow | Corporate securities    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Discount rate 4.90% 4.28%
Level 3 | Internal | Weighted Average | Discounted cash flow | Separate accounts commercial mortgage loan    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Spread 1.25% 1.80%
Level 3 | Internal | Weighted Average | Market comparables | Corporate securities    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
EBITDA multiples 10.4 9.0
Level 3 | Internal | Weighted Average | Market comparables | Equity securities    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
EBITDA multiples 0.9 3.3
Level 3 | Internal | Weighted Average | Liquidation | Corporate securities    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Liquidation value 58.29% 13.02%
Level 3 | Internal | Weighted Average | Net asset value | Equity securities    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Share price 472 495
Level 3 | Internal | Fair Value, Measurements, Recurring | Future policy benefits    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Future policy benefits $ 11,314 $ 18,879
Level 3 | Internal | Fair Value, Measurements, Recurring | Policyholders' account balances    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Policyholders' account balances 2,171 1,914
Level 3 | Internal | Fair Value, Measurements, Recurring | Corporate securities    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Corporate securities 4,486 3,697
Level 3 | Internal | Fair Value, Measurements, Recurring | Equity securities    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Equity securities 236 195
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 $ 162 $ 775