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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, 2023
Dec. 31, 2022
Dec. 31, 2021
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]      
Market risk benefit assets $ 1,981 $ 800 [1] $ 944
Market risk benefit liabilities 5,467 5,864 [1] $ 10,175
Fair Value, Measurements, Recurring      
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]      
Market risk benefit assets 1,981 800  
Market risk benefit liabilities 5,467 5,864  
Policyholders' account balances 7,752 3,492  
Level 3      
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]      
Funds held under reinsurance agreements $ 10,000    
Level 3 | Minimum      
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]      
Fair value inputs, policyholder age 50 years    
Level 3 | Minimum | Market risk benefit liabilities      
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]      
Market risk benefit assets $ 1,981 800  
Market risk benefit liabilities 5,467 5,864  
Policyholders' account balances $ 7,752 $ 3,492  
Level 3 | Internal | Minimum | Discounted cash flow | Market risk benefit liabilities      
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]      
Lapse rate 1.00% 1.00%  
Spread over SOFR 0.41% 0.50%  
Utilization rate 38.00% 38.00%  
Withdrawal rate (greater than maximum range) 81.00% 77.00%  
Mortality rate 0.00% 0.00%  
Equity volatility curve 15.00% 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 SOFR 0.41% 0.17%  
Mortality rate 0.00% 0.00%  
Equity volatility curve 6.00% 6.00%  
Option budget (1.00%) (2.00%)  
Level 3 | Internal | Minimum | Discounted cash flow | Corporate securities      
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]      
Discount rate 0.57% 0.61%  
Level 3 | Internal | Minimum | Discounted cash flow | Commercial mortgage-backed securities      
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]      
Liquidity premium 0.60%    
Level 3 | Internal | Minimum | Discounted cash flow | Market risk benefit assets      
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]      
Lapse rate 1.00% 1.00%  
Spread over SOFR 0.41% 0.50%  
Utilization rate 38.00% 38.00%  
Withdrawal rate (greater than maximum range) 81.00% 77.00%  
Mortality rate 0.00% 0.00%  
Equity volatility curve 15.00% 18.00%  
Level 3 | Internal | Minimum | Discounted cash flow | Equity securities      
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]      
Discount rate 0.16% 0.16%  
Level 3 | Internal | Minimum | Discounted cash flow | Separate accounts commercial mortgage loan      
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]      
Spread   1.25%  
Level 3 | Internal | Minimum | Market comparables | Corporate securities      
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]      
EBITDA multiples 5.5 2.2  
Level 3 | Internal | Minimum | Market comparables | Equity securities      
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]      
EBITDA multiples 1.0 1.0  
Level 3 | Internal | Minimum | Liquidation | Corporate securities      
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]      
Liquidation value 3.55% 8.16%  
Level 3 | Internal | Minimum | Net asset value | Equity securities      
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]      
Share price 3 6  
Level 3 | Internal | Maximum | Discounted cash flow | Market risk benefit liabilities      
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]      
Lapse rate 20.00% 20.00%  
Spread over SOFR 1.82% 2.20%  
Utilization rate 95.00% 95.00%  
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 80.00% 80.00%  
Spread over SOFR 1.85% 1.93%  
Mortality rate 23.00% 23.00%  
Equity volatility curve 25.00% 30.00%  
Option budget 7.00% 6.00%  
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 | Commercial mortgage-backed securities      
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]      
Liquidity premium 0.75%    
Level 3 | Internal | Maximum | Discounted cash flow | Market risk benefit assets      
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]      
Lapse rate 20.00% 20.00%  
Spread over SOFR 1.82% 2.20%  
Utilization rate 95.00% 95.00%  
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 | 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   2.10%  
Level 3 | Internal | Maximum | Market comparables | Corporate securities      
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]      
EBITDA multiples 8.8 23.5  
Level 3 | Internal | Maximum | Market comparables | Equity securities      
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]      
EBITDA multiples 10.0 7.5  
Level 3 | Internal | Maximum | Liquidation | Corporate securities      
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]      
Liquidation value 68.00% 8.25%  
Level 3 | Internal | Maximum | Net asset value | Equity securities      
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]      
Share price 1,714 1,708  
Level 3 | Internal | Weighted Average | Discounted cash flow | Corporate securities      
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]      
Discount rate 8.65% 8.09%  
Level 3 | Internal | Weighted Average | Discounted cash flow | Commercial mortgage-backed securities      
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]      
Liquidity premium 0.70%    
Level 3 | Internal | Weighted Average | Discounted cash flow | Separate accounts commercial mortgage loan      
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]      
Spread   1.44%  
Level 3 | Internal | Weighted Average | Market comparables | Corporate securities      
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]      
EBITDA multiples 7.4 8.3  
Level 3 | Internal | Weighted Average | Market comparables | Equity securities      
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]      
EBITDA multiples 6.3 4.0  
Level 3 | Internal | Weighted Average | Liquidation | Corporate securities      
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]      
Liquidation value 57.63% 8.21%  
Level 3 | Internal | Weighted Average | Net asset value | Equity securities      
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]      
Share price 733 22  
Level 3 | Internal | Fair Value, Measurements, Recurring | Market risk benefit liabilities      
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]      
Market risk benefit liabilities $ 5,467 $ 5,864  
Level 3 | Internal | Fair Value, Measurements, Recurring | Policyholders’ account balances      
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]      
Policyholders' account balances 7,752 3,492  
Level 3 | Internal | Fair Value, Measurements, Recurring | Corporate securities      
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]      
Corporate securities 1,311 3,128  
Level 3 | Internal | Fair Value, Measurements, Recurring | Commercial mortgage-backed securities      
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]      
Commercial mortgage-backed securities 938    
Level 3 | Internal | Fair Value, Measurements, Recurring | Market risk benefit assets      
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]      
Market risk benefit assets 1,981 800  
Level 3 | Internal | Fair Value, Measurements, Recurring | Equity securities      
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]      
Equity securities $ 246 290  
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   $ 74  
Level 3 | Internal | Fair Value, Measurements, Recurring | Minimum | Discounted cash flow | Equity securities      
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]      
Discount rate, equity securities 10.00%    
Level 3 | Internal | Fair Value, Measurements, Recurring | Maximum | Discounted cash flow | Equity securities      
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]      
Discount rate, equity securities 20.00%    
[1] Prior period amounts adjusted for the implementation of ASU 2018-12: Targeted Improvements to the Accounting for Long-Duration Contracts.