Fair Value Measurements - Quantitative Information about Level 3 Fair Value Measurements (Details) $ in Millions		Mar. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Bonds available for sale	[1]	$ 229,397	$ 226,156
Embedded derivatives within Policyholder contract deposits		6,100	5,400
Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Embedded derivatives within 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		$ 11,648	$ 12,099
Obligations of states, municipalities and political subdivisions | Minimum | Yield
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative asset, measurement input		0.0491	0.0528
Obligations of states, municipalities and political subdivisions | Maximum | Yield
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative asset, measurement input		0.0555	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		0.0523	0.0561
Obligations of states, municipalities and political subdivisions | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Bonds available for sale		$ 849	$ 799
Corporate debt
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Bonds available for sale		$ 138,571	$ 137,839
Corporate debt | Minimum | Yield
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative asset, measurement input		0.0476	0.0498
Corporate debt | Maximum | Yield
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative asset, measurement input		0.1160	0.0936
Corporate debt | Weighted-average | Yield
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative asset, measurement input		0.0781	0.0717
Corporate debt | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Bonds available for sale		$ 2,034	$ 2,527
RMBS
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Bonds available for sale		$ 19,603	$ 18,817
RMBS | Minimum | Yield
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative asset, measurement input		0.0625	0.0598
RMBS | Minimum | Constant prepayment rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative asset, measurement input		0.0478	0.0489
RMBS | Minimum | Loss severity
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative asset, measurement input		0.4453	0.4506
RMBS | Minimum | Constant default rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative asset, measurement input		0.0088	0.0082
RMBS | Maximum | Yield
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative asset, measurement input		0.0789	0.0775
RMBS | Maximum | Constant prepayment rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative asset, measurement input		0.1023	0.1049
RMBS | Maximum | Loss severity
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative asset, measurement input		0.7794	0.7687
RMBS | Maximum | Constant default rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative asset, measurement input		0.0276	0.0272
RMBS | Weighted-average | Yield
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative asset, measurement input		0.0707	0.0687
RMBS | Weighted-average | Constant prepayment rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative asset, measurement input		0.0750	0.0769
RMBS | Weighted-average | Loss severity
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative asset, measurement input		0.6124	0.6097
RMBS | Weighted-average | Constant default rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative asset, measurement input		0.0182	0.0177
RMBS | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Bonds available for sale		$ 5,035	$ 5,235
CLO/ABS | Minimum | Yield
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative asset, measurement input		0.0556	0.0600
CLO/ABS | Maximum | Yield
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative asset, measurement input		0.0742	0.0797
CLO/ABS | Weighted-average | Yield
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative asset, measurement input		0.0649	0.0699
CLO/ABS | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Bonds available for sale		$ 9,288	$ 7,503
CMBS
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Bonds available for sale		$ 14,874	$ 14,193
CMBS | Minimum | Yield
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative asset, measurement input		0.0428	0.0406
CMBS | Maximum | Yield
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative asset, measurement input		0.3014	0.1314
CMBS | Weighted-average | Yield
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative asset, measurement input		0.1387	0.0860
CMBS | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Bonds available for sale		$ 605	$ 587
Market risk benefit assets | Minimum | Equity volatility
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative asset, measurement input		0.0655	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
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
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		0.0034	0.0000
Market risk benefit assets | Maximum | Equity volatility
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative asset, measurement input		0.5175	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
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
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		0.0245	0.0203
Market risk benefit assets | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Bonds available for sale		$ 830	$ 796
Variable annuities guaranteed benefits | Minimum | Equity volatility
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Embedded derivative liability, measurement input		0.0655	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
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
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		0.0034	0.0000
Variable annuities guaranteed benefits | Maximum | Equity volatility
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Embedded derivative liability, measurement input		0.5175	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
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
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		0.0245	0.0203
Variable annuities guaranteed benefits | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Embedded derivatives within Policyholder contract deposits		$ 2,381	$ 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
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
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		0.0034	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
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
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		0.0245	0.0203
Fixed annuities guaranteed benefits | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Embedded derivatives within Policyholder contract deposits		$ 806	$ 680
Fixed index annuities guaranteed benefits | Minimum | Equity volatility
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Embedded derivative liability, measurement input		0.0655	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
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
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
Fixed index annuities guaranteed benefits | Minimum | NPA
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Embedded derivative liability, measurement input		0.0034	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
Fixed index annuities guaranteed benefits | Maximum | Equity volatility
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Embedded derivative liability, measurement input		0.5175	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
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		1.8000	1.8000
Fixed index annuities guaranteed benefits | Maximum | Utilization
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
Fixed index annuities guaranteed benefits | Maximum | NPA
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Embedded derivative liability, measurement input		0.0245	0.0203
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
Fixed index annuities guaranteed benefits | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Embedded derivatives within Policyholder contract deposits		$ 1,957	$ 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		0.0655	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
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
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		0.0034	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		0.5175	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
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		1.8000	1.8000
Index Credits On Fixed Index Annuities | Maximum | Utilization
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		0.0245	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		$ 5,269	$ 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		0.0034	0.0000
Index life | Maximum | Equity volatility
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Embedded derivative liability, measurement input		0.2140	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		0.0245	0.0203
Index life | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Embedded derivatives within Policyholder contract deposits		$ 795	$ 710

[1] See Note 9 for details of balances associated with variable interest entities.