Fair Value Measurements - Quantitative Information about Level 3 Fair Value Measurements (Details) $ in Millions		Mar. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Bonds available for sale	[1]	$ 232,487	$ 231,733
Embedded derivatives within Policyholder contract deposits		8,700	8,000
Policyholder contract deposits		163,698	161,979
Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Policyholder contract deposits		1,700	1,500
Obligations of states, municipalities and political subdivisions
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Bonds available for sale		$ 10,093	$ 10,663
Obligations of states, municipalities and political subdivisions | Minimum | Yield
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative asset, measurement input		0.0510	0.0497
Obligations of states, municipalities and political subdivisions | Maximum | Yield
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative asset, measurement input		0.0539	0.0531
Obligations of states, municipalities and political subdivisions | Weighted-average | Yield
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative asset, measurement input		0.0524	0.0514
Obligations of states, municipalities and political subdivisions | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Bonds available for sale		$ 809	$ 824
Corporate debt
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Bonds available for sale		$ 135,818	$ 138,432
Corporate debt | Minimum | Yield
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative asset, measurement input		0.0494	0.0519
Corporate debt | Maximum | Yield
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative asset, measurement input		0.1081	0.0848
Corporate debt | Weighted-average | Yield
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative asset, measurement input		0.0765	0.0683
Corporate debt | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Bonds available for sale		$ 1,945	$ 1,803
RMBS
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Bonds available for sale		$ 21,421	$ 20,444
RMBS | Minimum | Yield
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative asset, measurement input		0.0566	0.0613
RMBS | Minimum | Constant prepayment rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative asset, measurement input		0.0440	0.0434
RMBS | Minimum | Loss severity
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative asset, measurement input		0.3581	0.3356
RMBS | Minimum | Constant default rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative asset, measurement input		0.0078	0.0076
RMBS | Maximum | Yield
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative asset, measurement input		0.0702	0.0741
RMBS | Maximum | Constant prepayment rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative asset, measurement input		0.1002	0.0999
RMBS | Maximum | Loss severity
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative asset, measurement input		0.8447	0.8759
RMBS | Maximum | Constant default rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative asset, measurement input		0.0256	0.0256
RMBS | Weighted-average | Yield
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative asset, measurement input		0.0634	0.0677
RMBS | Weighted-average | Constant prepayment rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative asset, measurement input		0.0721	0.0717
RMBS | Weighted-average | Loss severity
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative asset, measurement input		0.6014	0.6057
RMBS | Weighted-average | Constant default rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative asset, measurement input		0.0167	0.0166
RMBS | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Bonds available for sale		$ 4,672	$ 4,656
CLO/ABS | Minimum | Yield
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative asset, measurement input		0.0581	0.0562
CLO/ABS | Maximum | Yield
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative asset, measurement input		0.0789	0.0789
CLO/ABS | Weighted-average | Yield
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative asset, measurement input		0.0685	0.0676
CLO/ABS | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Bonds available for sale		$ 16,371	$ 14,242
CMBS
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Bonds available for sale		$ 14,488	$ 14,128
CMBS | Minimum | Yield
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative asset, measurement input		0.0522	0.0562
CMBS | Maximum | Yield
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative asset, measurement input		0.1838	0.1785
CMBS | Weighted-average | Yield
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative asset, measurement input		0.1141	0.1173
CMBS | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Bonds available for sale		$ 547	$ 587
Market risk benefit assets | Minimum | Equity volatility
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative asset, measurement input		0.0635	0.0625
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		0.0006	0.0000
Market risk benefit assets | Maximum | Equity volatility
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative asset, measurement input		0.4995	0.4975
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		0.0233	0.0229
Market risk benefit assets | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Bonds available for sale		$ 1,172	$ 912
Variable annuities guaranteed benefits | Minimum | Equity volatility
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Embedded derivative liability, measurement input		0.0635	0.0625
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		0.0006	0.0000
Variable annuities guaranteed benefits | Maximum | Equity volatility
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Embedded derivative liability, measurement input		0.4995	0.4975
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		0.0233	0.0229
Variable annuities guaranteed benefits | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Embedded derivatives within Policyholder contract deposits		$ 1,675	$ 2,174
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		0.0006	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	1.8618
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		0.0233	0.0229
Fixed annuities guaranteed benefits | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Embedded derivatives within Policyholder contract deposits		$ 1,130	$ 1,111
Fixed index annuities guaranteed benefits | Minimum | Equity volatility
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Embedded derivative liability, measurement input		0.0635	0.0625
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 | 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		0.0006	0.0000
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 | Maximum | Equity volatility
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Embedded derivative liability, measurement input		0.4995	0.4975
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		1.4600	1.4600
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 | 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		0.0233	0.0229
Fixed index annuities guaranteed benefits | Maximum | Option budget
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Embedded derivative liability, measurement input		0.0600	0.0600
Fixed index annuities guaranteed benefits | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Embedded derivatives within Policyholder contract deposits		$ 2,362	$ 2,420
Index credits on fixed index annuities(i) | Minimum | Equity volatility
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Embedded derivative liability, measurement input		0.0635	0.0625
Index credits on fixed index annuities(i) | 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(i) | 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(i) | 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(i) | 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(i) | 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(i) | Minimum | NPA
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Embedded derivative liability, measurement input		0.0006	0.0000
Index credits on fixed index annuities(i) | 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(i) | Maximum | Equity volatility
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Embedded derivative liability, measurement input		0.4995	0.4975
Index credits on fixed index annuities(i) | 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(i) | 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(i) | Maximum | Mortality multiplier
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Embedded derivative liability, measurement input		1.4600	1.4600
Index credits on fixed index annuities(i) | 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(i) | 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(i) | Maximum | NPA
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Embedded derivative liability, measurement input		0.0233	0.0229
Index credits on fixed index annuities(i) | Maximum | Option budget
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Embedded derivative liability, measurement input		0.0600	0.0600
Index credits on fixed index annuities(i) | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Embedded derivatives within Policyholder contract deposits		$ 7,603	$ 6,953
Index universal life | Minimum | Equity volatility
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Embedded derivative liability, measurement input		0.0585	0.0585
Index universal life | Minimum | Base lapse rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Embedded derivative liability, measurement input		0.0000	0.0000
Index universal life | Minimum | NPA
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Embedded derivative liability, measurement input		0.0006	0.0000
Index universal life | Minimum | Mortality rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Embedded derivative liability, measurement input		0.0000	0.0000
Index universal life | Maximum | Equity volatility
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Embedded derivative liability, measurement input		0.1995	0.2036
Index universal life | Maximum | Base lapse rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Embedded derivative liability, measurement input		0.3797	0.3797
Index universal life | Maximum | NPA
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Embedded derivative liability, measurement input		0.0233	0.0229
Index universal life | Maximum | Mortality rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Embedded derivative liability, measurement input		1.0000	1.0000
Index universal life | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Embedded derivatives within Policyholder contract deposits		$ 947	$ 989

[1] See Note 10 for details of balances associated with variable interest entities.