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Fair Value Measurements - Quantitative Information about Level 3 Fair Value Measurements (Details)
$ in Millions
Sep. 30, 2023
USD ($)
Dec. 31, 2022
USD ($)
Sep. 30, 2022
USD ($)
Jan. 01, 2021
USD ($)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Bonds available for sale [1] $ 214,940 $ 226,156    
Embedded derivatives within Policyholder contract deposits 6,400 5,400    
Policyholder contract deposits 159,737 155,984 $ 154,852 $ 148,223
Level 3        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Embedded derivatives within Policyholder contract deposits 1,200 1,100    
Policyholder contract deposits 1,200 1,100    
Obligations of states, municipalities and political subdivisions        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Bonds available for sale $ 10,446 $ 12,099    
Obligations of states, municipalities and political subdivisions | Minimum | Yield        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Derivative asset, measurement input 0.0564 0.0528    
Obligations of states, municipalities and political subdivisions | Maximum | Yield        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Derivative asset, measurement input 0.0605 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 0.0585 0.0561    
Obligations of states, municipalities and political subdivisions | Level 3        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Bonds available for sale $ 743 $ 799    
Corporate debt        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Bonds available for sale $ 126,091 $ 137,839    
Corporate debt | Minimum | Yield        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Derivative asset, measurement input 0.0536 0.0498    
Corporate debt | Maximum | Yield        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Derivative asset, measurement input 0.0914 0.0936    
Corporate debt | Weighted-average | Yield        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Derivative asset, measurement input 0.0725 0.0717    
Corporate debt | Level 3        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Bonds available for sale $ 1,459 $ 2,527    
RMBS        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Bonds available for sale $ 18,731 $ 18,817    
RMBS | Minimum | Yield        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Derivative asset, measurement input 0.0538 0.0598    
RMBS | Minimum | Constant prepayment rate        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Derivative asset, measurement input 0.0395 0.0489    
RMBS | Minimum | Loss severity        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Derivative asset, measurement input 0.4422 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 0.0734 0.0775    
RMBS | Maximum | Constant prepayment rate        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Derivative asset, measurement input 0.0901 0.1049    
RMBS | Maximum | Loss severity        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Derivative asset, measurement input 0.7729 0.7687    
RMBS | Maximum | Constant default rate        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Derivative asset, measurement input 0.0246 0.0272    
RMBS | Weighted-average | Yield        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Derivative asset, measurement input 0.0636 0.0687    
RMBS | Weighted-average | Constant prepayment rate        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Derivative asset, measurement input 0.0648 0.0769    
RMBS | Weighted-average | Loss severity        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Derivative asset, measurement input 0.6075 0.6097    
RMBS | Weighted-average | Constant default rate        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Derivative asset, measurement input 0.0161 0.0177    
RMBS | Level 3        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Bonds available for sale $ 4,855 $ 5,235    
CLO/ABS | Minimum | Yield        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Derivative asset, measurement input 0.0631 0.0600    
CLO/ABS | Maximum | Yield        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Derivative asset, measurement input 0.0857 0.0797    
CLO/ABS | Weighted-average | Yield        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Derivative asset, measurement input 0.0744 0.0699    
CLO/ABS | Level 3        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Bonds available for sale $ 12,955 $ 7,503    
CMBS        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Bonds available for sale $ 13,510 $ 14,193    
CMBS | Minimum | Yield        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Derivative asset, measurement input 0.0585 0.0406    
CMBS | Maximum | Yield        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Derivative asset, measurement input 0.1789 0.1314    
CMBS | Weighted-average | Yield        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Derivative asset, measurement input 0.1187 0.0860    
CMBS | Level 3        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Bonds available for sale $ 501 $ 587    
Market risk benefit assets | Minimum | Equity volatility        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Derivative asset, measurement input 0.0665 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 0.0062 0.0000    
Market risk benefit assets | Maximum | Equity volatility        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Derivative asset, measurement input 0.5235 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 0.0208 0.0203    
Market risk benefit assets | Level 3        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Bonds available for sale $ 978 $ 796    
Variable annuities guaranteed benefits | Minimum | Equity volatility        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Embedded derivative liability, measurement input 0.0665 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 0.0062 0.0000    
Variable annuities guaranteed benefits | Maximum | Equity volatility        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Embedded derivative liability, measurement input 0.5235 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 0.0208 0.0203    
Variable annuities guaranteed benefits | Level 3        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Embedded derivatives within Policyholder contract deposits $ 1,835 $ 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 0.0062 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 0.0208 0.0203    
Fixed annuities guaranteed benefits | Level 3        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Embedded derivatives within Policyholder contract deposits $ 824 $ 680    
Fixed index annuities guaranteed benefits | Minimum | Equity volatility        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Embedded derivative liability, measurement input 0.0665 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 0.0062 0.0000    
Fixed index annuities guaranteed benefits | Maximum | Equity volatility        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Embedded derivative liability, measurement input 0.5235 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 0.0208 0.0203    
Fixed index annuities guaranteed benefits | Level 3        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Embedded derivatives within Policyholder contract deposits $ 1,860 $ 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 0.0665 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 0.0062 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 0.5235 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 0.0208 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 $ 5,573 $ 4,657    
Index life | Minimum | Equity volatility        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Embedded derivative liability, measurement input 0.0575 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 0.0062 0.0000    
Index life | Maximum | Equity volatility        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Embedded derivative liability, measurement input 0.2125 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 0.0208 0.0203    
Index life | Level 3        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Embedded derivatives within Policyholder contract deposits $ 754 $ 710    
[1] See Note 10 for details of balances associated with variable interest entities.