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Fair Value of Assets and Liabilities (Quantitative Info for Level 3 Inputs) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Corporate securities $ 5,560 $ 5,219
Future policy benefits 293,527 273,846
Fair Value, Measurements, Recurring    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Future policy benefits 12,831 8,926
Policyholders' account balances $ 1,316 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 $ 12,831 8,926
Policyholders' account balances $ 1,316 $ 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 0.10% 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 0.10%  
Mortality rate 0.00%  
Equity volatility curve 6.00%  
Level 3 | Internal | Minimum | Discounted cash flow | Corporate securities    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Discount rate 0.49% 0.57%
Level 3 | Internal | Minimum | Discounted cash flow | Equity securities    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Discount rate 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 1.11% 1.12%
Level 3 | Internal | Minimum | Market comparables | Corporate securities    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
EBITDA multiples 5.7 4.5
Level 3 | Internal | Minimum | Market comparables | Equity securities    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
EBITDA multiples 1  
Level 3 | Internal | Minimum | Liquidation | Corporate securities    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Liquidation value 14.25% 11.77%
Level 3 | Internal | Minimum | Net asset value | Equity securities    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Share price 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% 13.00%
Spread over LIBOR 1.23% 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 1.23%  
Mortality rate 24.00%  
Equity volatility curve 25.00%  
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 | Equity securities    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Discount rate 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 1.85% 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 | Market comparables | Equity securities    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
EBITDA multiples 10.1  
Level 3 | Internal | Maximum | Liquidation | Corporate securities    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Liquidation value 83.61% 94.00%
Level 3 | Internal | Maximum | Net asset value | Equity securities    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Share price 1,353  
Level 3 | Internal | Weighted Average | Discounted cash flow | Corporate securities    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Discount rate 7.41% 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 1.26% 1.29%
Level 3 | Internal | Weighted Average | Market comparables | Corporate securities    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
EBITDA multiples 7.3 8.1
Level 3 | Internal | Weighted Average | Market comparables | Equity securities    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
EBITDA multiples 5.4  
Level 3 | Internal | Weighted Average | Liquidation | Corporate securities    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Liquidation value 59.47% 32.16%
Level 3 | Internal | Weighted Average | Net asset value | Equity securities    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Share price 451  
Level 3 | Internal | Fair Value, Measurements, Recurring | Future policy benefits    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Future policy benefits $ 12,831 $ 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 1,316  
Level 3 | Internal | Fair Value, Measurements, Recurring | Corporate securities    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Corporate securities 1,424 1,392
Level 3 | Internal | Fair Value, Measurements, Recurring | Equity securities    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Equity securities 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 $ 796 $ 785