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Fair Value of Assets and Liabilities (Quantitative Info for Level 3 Inputs) (Details) - USD ($)
$ in Millions
6 Months Ended 12 Months Ended
Jun. 30, 2019
Dec. 31, 2018
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Future policy benefits $ 285,527 $ 273,846
Fair Value, Measurements, Recurring    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Future policy benefits 12,723 8,926
Policyholders' account balances $ 1,047 56
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 $ 12,723 8,926
Policyholders' account balances $ 1,047 $ 56
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 0.16% 0.36%
Utilization rate 43.00% 50.00%
Withdrawal rate (greater than maximum range) 78.00% 78.00%
Mortality rate 0.00% 0.00%
Equity volatility curve 13.00% 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%  
Spread over LIBOR 0.16%  
Mortality rate 0.00%  
Equity volatility curve 10.00%  
Level 3 | Internal | Minimum | Discounted cash flow | Corporate securities    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Discount rate 0.36% 0.57%
Level 3 | Internal | Minimum | Discounted cash flow | Separate Accounts Commercial Mortgage Loan    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Spread 1.06% 1.12%
Level 3 | Internal | Minimum | Market comparables | Corporate securities    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
EBITDA multiples 4.5 4.5
Level 3 | Internal | Minimum | Liquidation | Corporate securities    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Liquidation value 3.98% 11.77%
Level 3 | Internal | Maximum | Discounted cash flow | Future policy benefits    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Lapse rate 18.00% 13.00%
Spread over LIBOR 1.24% 1.60%
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 23.00% 22.00%
Level 3 | Internal | Maximum | Discounted cash flow | Policyholders' account balances    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Lapse rate 42.00%  
Spread over LIBOR 1.24%  
Mortality rate 24.00%  
Equity volatility curve 23.00%  
Level 3 | Internal | Maximum | Discounted cash flow | Corporate 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 2.44% 2.55%
Level 3 | Internal | Maximum | Market comparables | Corporate securities    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
EBITDA multiples 9.2 8.5
Level 3 | Internal | Maximum | Liquidation | Corporate securities    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Liquidation value 100.00% 94.00%
Level 3 | Internal | Weighted Average | Discounted cash flow | Corporate securities    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Discount rate 8.37% 8.58%
Level 3 | Internal | Weighted Average | Discounted cash flow | Separate Accounts Commercial Mortgage Loan    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Spread 1.21% 1.29%
Level 3 | Internal | Weighted Average | Market comparables | Corporate securities    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
EBITDA multiples 7.0 8.1
Level 3 | Internal | Weighted Average | Liquidation | Corporate securities    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Liquidation value 58.42% 32.16%
Level 3 | Internal | Fair Value, Measurements, Recurring | Future policy benefits    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Future policy benefits $ 12,723 $ 8,926
Level 3 | Internal | Fair Value, Measurements, Recurring | Policyholders' account balances    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Policyholders' account balances 1,047  
Level 3 | Internal | Fair Value, Measurements, Recurring | Corporate securities    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Corporate securities 1,441 1,392
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 $ 860 $ 785