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Fair Value Measurements - Quantitative Information about Level 3 Fair Value Measurements (Details)
$ in Millions
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Jan. 01, 2021
USD ($)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Bonds available for sale [1] $ 231,733 $ 226,156  
Embedded derivatives within Policyholder contract deposits 8,000 5,400  
Policyholder contract deposits 161,979 155,984 $ 148,223
Level 3      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Embedded derivatives within Policyholder contract deposits 1,500 1,100  
Policyholder contract deposits 1,500 1,100  
Obligations of states, municipalities and political subdivisions      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Bonds available for sale $ 10,663 $ 12,099  
Obligations of states, municipalities and political subdivisions | Minimum | Yield      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Derivative asset, measurement input 0.0497 0.0528  
Obligations of states, municipalities and political subdivisions | Maximum | Yield      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Derivative asset, measurement input 0.0531 0.0594  
Obligations of states, municipalities and political subdivisions | Weighted-average | Yield      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Derivative asset, measurement input 0.0514 0.0561  
Obligations of states, municipalities and political subdivisions | Level 3      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Bonds available for sale $ 824 $ 799  
Corporate debt      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Bonds available for sale $ 138,432 $ 137,839  
Corporate debt | Minimum | Yield      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Derivative asset, measurement input 0.0519 0.0498  
Corporate debt | Maximum | Yield      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Derivative asset, measurement input 0.0848 0.0936  
Corporate debt | Weighted-average | Yield      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Derivative asset, measurement input 0.0683 0.0717  
Corporate debt | Level 3      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Bonds available for sale $ 1,803 $ 2,527  
RMBS      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Bonds available for sale $ 20,444 $ 18,817  
RMBS | Minimum | Yield      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Derivative asset, measurement input 0.0613 0.0598  
RMBS | Minimum | Constant prepayment rate      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Derivative asset, measurement input 0.0434 0.0489  
RMBS | Minimum | Loss severity      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Derivative asset, measurement input 0.3356 0.4506  
RMBS | Minimum | Constant default rate      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Derivative asset, measurement input 0.0076 0.0082  
RMBS | Maximum | Yield      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Derivative asset, measurement input 0.0741 0.0775  
RMBS | Maximum | Constant prepayment rate      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Derivative asset, measurement input 0.0999 0.1049  
RMBS | Maximum | Loss severity      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Derivative asset, measurement input 0.8759 0.7687  
RMBS | Maximum | Constant default rate      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Derivative asset, measurement input 0.0256 0.0272  
RMBS | Weighted-average | Yield      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Derivative asset, measurement input 0.0677 0.0687  
RMBS | Weighted-average | Constant prepayment rate      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Derivative asset, measurement input 0.0717 0.0769  
RMBS | Weighted-average | Loss severity      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Derivative asset, measurement input 0.6057 0.6097  
RMBS | Weighted-average | Constant default rate      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Derivative asset, measurement input 0.0166 0.0177  
RMBS | Level 3      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Bonds available for sale $ 4,656 $ 5,235  
CLO/ABS | Minimum | Yield      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Derivative asset, measurement input 0.0562 0.0600  
CLO/ABS | Maximum | Yield      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Derivative asset, measurement input 0.0789 0.0797  
CLO/ABS | Weighted-average | Yield      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Derivative asset, measurement input 0.0676 0.0699  
CLO/ABS | Level 3      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Bonds available for sale $ 14,242 $ 7,503  
CMBS      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Bonds available for sale $ 14,128 $ 14,193  
CMBS | Minimum | Yield      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Derivative asset, measurement input 0.0562 0.0406  
CMBS | Maximum | Yield      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Derivative asset, measurement input 0.1785 0.1314  
CMBS | Weighted-average | Yield      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Derivative asset, measurement input 0.1173 0.0860  
CMBS | Level 3      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Bonds available for sale $ 587 $ 587  
Market risk benefit assets | Minimum | Equity volatility      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Derivative asset, measurement input 0.0625 0.0645  
Market risk benefit assets | Minimum | Base lapse rate      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Derivative asset, measurement input 0.0016 0.0016  
Market risk benefit assets | Minimum | Dynamic lapse multiplier(e)      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Derivative asset, measurement input 0.2000 0.2000  
Market risk benefit assets | Minimum | Mortality multiplier      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Derivative asset, measurement input 0.3825 0.3825  
Market risk benefit assets | Minimum | Utilization(h)      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Derivative asset, measurement input 0.8000 0.8000  
Market risk benefit assets | Minimum | Equity / interest rate correlation      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Derivative asset, measurement input 0.0000 0.0000  
Market risk benefit assets | Minimum | NPA      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Derivative asset, measurement input 0.0000 0.0000  
Market risk benefit assets | Maximum | Equity volatility      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Derivative asset, measurement input 0.4975 0.5075  
Market risk benefit assets | Maximum | Base lapse rate      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Derivative asset, measurement input 0.2880 0.2880  
Market risk benefit assets | Maximum | Dynamic lapse multiplier(e)      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Derivative asset, measurement input 1.8618 1.8618  
Market risk benefit assets | Maximum | Mortality multiplier      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Derivative asset, measurement input 1.6001 1.6001  
Market risk benefit assets | Maximum | Utilization(h)      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Derivative asset, measurement input 1.0000 1.0000  
Market risk benefit assets | Maximum | Equity / interest rate correlation      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Derivative asset, measurement input 0.3000 0.3000  
Market risk benefit assets | Maximum | NPA      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Derivative asset, measurement input 0.0229 0.0203  
Market risk benefit assets | Level 3      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Bonds available for sale $ 912 $ 796  
Variable annuities guaranteed benefits | Minimum | Equity volatility      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Embedded derivative liability, measurement input 0.0625 0.0645  
Variable annuities guaranteed benefits | Minimum | Base lapse rate      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Embedded derivative liability, measurement input 0.0016 0.0016  
Variable annuities guaranteed benefits | Minimum | Dynamic lapse multiplier(e)      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Embedded derivative liability, measurement input 0.2000 0.2000  
Variable annuities guaranteed benefits | Minimum | Mortality multiplier      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Embedded derivative liability, measurement input 0.3825 0.3825  
Variable annuities guaranteed benefits | Minimum | Utilization(h)      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Embedded derivative liability, measurement input 0.8000 0.8000  
Variable annuities guaranteed benefits | Minimum | Equity / interest rate correlation      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Embedded derivative liability, measurement input 0.0000 0.0000  
Variable annuities guaranteed benefits | Minimum | NPA      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Embedded derivative liability, measurement input 0.0000 0.0000  
Variable annuities guaranteed benefits | Maximum | Equity volatility      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Embedded derivative liability, measurement input 0.4975 0.5075  
Variable annuities guaranteed benefits | Maximum | Base lapse rate      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Embedded derivative liability, measurement input 0.2880 0.2880  
Variable annuities guaranteed benefits | Maximum | Dynamic lapse multiplier(e)      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Embedded derivative liability, measurement input 1.8618 1.8618  
Variable annuities guaranteed benefits | Maximum | Mortality multiplier      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Embedded derivative liability, measurement input 1.6001 1.6001  
Variable annuities guaranteed benefits | Maximum | Utilization(h)      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Embedded derivative liability, measurement input 1.0000 1.0000  
Variable annuities guaranteed benefits | Maximum | Equity / interest rate correlation      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Embedded derivative liability, measurement input 0.3000 0.3000  
Variable annuities guaranteed benefits | Maximum | NPA      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Embedded derivative liability, measurement input 0.0229 0.0203  
Variable annuities guaranteed benefits | Level 3      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Embedded derivatives within Policyholder contract deposits $ 2,174 $ 2,358  
Fixed annuities guaranteed benefits | Minimum | Base lapse rate      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Embedded derivative liability, measurement input 0.0020 0.0020  
Fixed annuities guaranteed benefits | Minimum | Dynamic lapse multiplier(e)      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Embedded derivative liability, measurement input 0.2000 0.2000  
Fixed annuities guaranteed benefits | Minimum | Mortality multiplier      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Embedded derivative liability, measurement input 0.4026 0.4026  
Fixed annuities guaranteed benefits | Minimum | Utilization(h)      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Embedded derivative liability, measurement input 0.9000 0.9000  
Fixed annuities guaranteed benefits | Minimum | NPA      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Embedded derivative liability, measurement input 0.0000 0.0000  
Fixed annuities guaranteed benefits | Maximum | Base lapse rate      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Embedded derivative liability, measurement input 0.1575 0.1575  
Fixed annuities guaranteed benefits | Maximum | Dynamic lapse multiplier(e)      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Embedded derivative liability, measurement input 1.8618 1.8616  
Fixed annuities guaranteed benefits | Maximum | Mortality multiplier      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Embedded derivative liability, measurement input 1.6843 1.6843  
Fixed annuities guaranteed benefits | Maximum | Utilization(h)      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Embedded derivative liability, measurement input 0.9750 0.9750  
Fixed annuities guaranteed benefits | Maximum | NPA      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Embedded derivative liability, measurement input 0.0229 0.0203  
Fixed annuities guaranteed benefits | Level 3      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Embedded derivatives within Policyholder contract deposits $ 1,111 $ 680  
Fixed index annuities guaranteed benefits | Minimum | Equity volatility      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Embedded derivative liability, measurement input 0.0625 0.0645  
Fixed index annuities guaranteed benefits | Minimum | Base lapse rate      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Embedded derivative liability, measurement input 0.0020 0.0020  
Fixed index annuities guaranteed benefits | Minimum | Dynamic lapse multiplier(e)      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Embedded derivative liability, measurement input 0.2000 0.2000  
Fixed index annuities guaranteed benefits | Minimum | Mortality multiplier      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Embedded derivative liability, measurement input 0.2400 0.2400  
Fixed index annuities guaranteed benefits | Minimum | Utilization(h)      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Embedded derivative liability, measurement input 0.6000 0.6000  
Fixed index annuities guaranteed benefits | Minimum | Option budget      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Embedded derivative liability, measurement input 0.0000 0.0000  
Fixed index annuities guaranteed benefits | Minimum | Equity / interest rate correlation      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Embedded derivative liability, measurement input 0.0000 0.0000  
Fixed index annuities guaranteed benefits | Minimum | NPA      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Embedded derivative liability, measurement input 0.0000 0.0000  
Fixed index annuities guaranteed benefits | Maximum | Equity volatility      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Embedded derivative liability, measurement input 0.4975 0.5075  
Fixed index annuities guaranteed benefits | Maximum | Base lapse rate      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Embedded derivative liability, measurement input 0.5000 0.5000  
Fixed index annuities guaranteed benefits | Maximum | Dynamic lapse multiplier(e)      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Embedded derivative liability, measurement input 1.8618 1.8618  
Fixed index annuities guaranteed benefits | Maximum | Mortality multiplier      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Embedded derivative liability, measurement input 1.4600 1.8000  
Fixed index annuities guaranteed benefits | Maximum | Utilization(h)      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Embedded derivative liability, measurement input 0.9750 0.9750  
Fixed index annuities guaranteed benefits | Maximum | Option budget      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Embedded derivative liability, measurement input 0.0600 0.0500  
Fixed index annuities guaranteed benefits | Maximum | Equity / interest rate correlation      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Embedded derivative liability, measurement input 0.3000 0.3000  
Fixed index annuities guaranteed benefits | Maximum | NPA      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Embedded derivative liability, measurement input 0.0229 0.0203  
Fixed index annuities guaranteed benefits | Level 3      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Embedded derivatives within Policyholder contract deposits $ 2,420 $ 1,698  
Index Credits On Fixed Index Annuities | Minimum | Equity volatility      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Embedded derivative liability, measurement input 0.0625 0.0645  
Index Credits On Fixed Index Annuities | Minimum | Base lapse rate      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Embedded derivative liability, measurement input 0.0020 0.0020  
Index Credits On Fixed Index Annuities | Minimum | Dynamic lapse multiplier(e)      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Embedded derivative liability, measurement input 0.2000 0.2000  
Index Credits On Fixed Index Annuities | Minimum | Mortality multiplier      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Embedded derivative liability, measurement input 0.2400 0.2400  
Index Credits On Fixed Index Annuities | Minimum | Utilization(h)      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Embedded derivative liability, measurement input 0.6000 0.6000  
Index Credits On Fixed Index Annuities | Minimum | Option budget      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Embedded derivative liability, measurement input 0.0000 0.0000  
Index Credits On Fixed Index Annuities | Minimum | Equity / interest rate correlation      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Embedded derivative liability, measurement input 0.0000 0.0000  
Index Credits On Fixed Index Annuities | Minimum | NPA      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Embedded derivative liability, measurement input 0.0000 0.0000  
Index Credits On Fixed Index Annuities | Maximum | Equity volatility      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Embedded derivative liability, measurement input 0.4975 0.5075  
Index Credits On Fixed Index Annuities | Maximum | Base lapse rate      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Embedded derivative liability, measurement input 0.5000 0.5000  
Index Credits On Fixed Index Annuities | Maximum | Dynamic lapse multiplier(e)      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Embedded derivative liability, measurement input 1.8618 1.8618  
Index Credits On Fixed Index Annuities | Maximum | Mortality multiplier      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Embedded derivative liability, measurement input 1.4600 1.8000  
Index Credits On Fixed Index Annuities | Maximum | Utilization(h)      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Embedded derivative liability, measurement input 0.9750 0.9750  
Index Credits On Fixed Index Annuities | Maximum | Option budget      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Embedded derivative liability, measurement input 0.0600 0.0500  
Index Credits On Fixed Index Annuities | Maximum | Equity / interest rate correlation      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Embedded derivative liability, measurement input 0.3000 0.3000  
Index Credits On Fixed Index Annuities | Maximum | NPA      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Embedded derivative liability, measurement input 0.0229 0.0203  
Index Credits On Fixed Index Annuities | Level 3      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Embedded derivatives within Policyholder contract deposits $ 6,953 $ 4,657  
Index life | Minimum | Equity volatility      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Embedded derivative liability, measurement input 0.0585 0.0575  
Index life | Minimum | Base lapse rate      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Embedded derivative liability, measurement input 0.0000 0.0000  
Index life | Minimum | Mortality rate      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Embedded derivative liability, measurement input 0.0000 0.0000  
Index life | Minimum | NPA      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Embedded derivative liability, measurement input 0.0000 0.0000  
Index life | Maximum | Equity volatility      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Embedded derivative liability, measurement input 0.2036 0.2363  
Index life | Maximum | Base lapse rate      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Embedded derivative liability, measurement input 0.3797 0.3797  
Index life | Maximum | Mortality rate      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Embedded derivative liability, measurement input 1.0000 1.0000  
Index life | Maximum | NPA      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Embedded derivative liability, measurement input 0.0229 0.0203  
Index life | Level 3      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Embedded derivatives within Policyholder contract deposits $ 989 $ 710  
[1] See Note 10 for details of balances associated with variable interest entities.