MRBs - Summary of Balances of Changes in Net MRB (Assets) Liabilities (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Market Risk Benefit [Roll Forward]
Balance as of beginning-of-year	$ (2,178)
Balance as of end-of-year	(3,814)	$ (2,178)
Variable Annuities
Market Risk Benefit [Roll Forward]
Balance as of beginning-of-year	(2,180)	(662)
Balance as of beginning-of-year, before the effect of changes in non-performance risk	(881)	1,511
Issuances	6	8
Attributed fees collected	1,520	1,497
Benefit payments	(34)	(64)
Effect of changes in interest rates	(1,918)	(110)
Effect of changes in equity markets	(2,277)	(3,167)
Effect of changes in equity index volatility	(88)	(593)
In-force updates and other changes in MRBs	213	136
Effect of changes in future expected policyholder behavior	7	(33)
Effect of changes in future expected assumptions	(199)	(66)
Balance as of end-of-year, before the effect of changes in non-performance risk	(3,651)	(881)
Effect of cumulative changes in non-performance risk	(153)	(1,299)
Balance as of end-of-year	(3,804)	(2,180)
Less: ceded MRB assets (liabilities)	(379)	(238)
Balance as of end-of-year, net of reinsurance	$ (3,425)	$ (1,942)
Weighted-average age of policyholders (years)	73 years	72 years
Net amount at risk	$ 1,962	$ 3,031
Variable Annuities | Cumulative Effect, Period of Adoption, Adjustment
Market Risk Benefit [Roll Forward]
Balance as of beginning-of-year	(1,299)	(2,173)
Balance as of end-of-year		(1,299)
Fixed Annuities
Market Risk Benefit [Roll Forward]
Balance as of beginning-of-year	32	(45)
Balance as of beginning-of-year, before the effect of changes in non-performance risk	90	(5)
Issuances	0	0
Attributed fees collected	31	32
Benefit payments	0	0
Effect of changes in interest rates	(70)	(24)
Effect of changes in equity markets	(16)	(12)
Effect of changes in equity index volatility	(5)	9
In-force updates and other changes in MRBs	6	5
Effect of changes in future expected policyholder behavior	11	70
Effect of changes in future expected assumptions	18	15
Balance as of end-of-year, before the effect of changes in non-performance risk	65	90
Effect of cumulative changes in non-performance risk	(33)	(58)
Balance as of end-of-year	32	32
Less: ceded MRB assets (liabilities)	0	0
Balance as of end-of-year, net of reinsurance	$ 32	$ 32
Weighted-average age of policyholders (years)	70 years	68 years
Net amount at risk	$ 240	$ 203
Fixed Annuities | Cumulative Effect, Period of Adoption, Adjustment
Market Risk Benefit [Roll Forward]
Balance as of beginning-of-year	(58)	(40)
Balance as of end-of-year		(58)
Retirement Plan Services
Market Risk Benefit [Roll Forward]
Balance as of beginning-of-year	(30)	(22)
Balance as of beginning-of-year, before the effect of changes in non-performance risk	(26)	(20)
Issuances	0	0
Attributed fees collected	8	6
Benefit payments	0	0
Effect of changes in interest rates	(18)	5
Effect of changes in equity markets	(8)	(13)
Effect of changes in equity index volatility	0	(3)
In-force updates and other changes in MRBs	8	1
Effect of changes in future expected policyholder behavior	0	0
Effect of changes in future expected assumptions	(6)	(2)
Balance as of end-of-year, before the effect of changes in non-performance risk	(42)	(26)
Effect of cumulative changes in non-performance risk	0	(4)
Balance as of end-of-year	(42)	(30)
Less: ceded MRB assets (liabilities)	0	0
Balance as of end-of-year, net of reinsurance	$ (42)	$ (30)
Weighted-average age of policyholders (years)	63 years	63 years
Net amount at risk	$ 3	$ 4
Retirement Plan Services | Cumulative Effect, Period of Adoption, Adjustment
Market Risk Benefit [Roll Forward]
Balance as of beginning-of-year	$ (4)	(2)
Balance as of end-of-year		$ (4)