MRBs - Summary of Balances of Changes in Net MRB (Assets) Liabilities (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Market Risk Benefit [Roll Forward]
Balance as of beginning-of-year	$ (3,814)
Balance as of end-of-period	(2,851)
Variable Annuities
Market Risk Benefit [Roll Forward]
Balance as of beginning-of-year	(3,804)	$ (2,180)
Balance as of beginning-of-period, before the effect of changes in non-performance risk	(3,651)	(881)
Issuances	5	3
Attributed fees collected	373	380
Benefit payments	(6)	(11)
Effect of changes in interest rates	396	(1,081)
Effect of changes in equity markets	456	(1,343)
Effect of changes in equity index volatility	31	4
In-force updates and other changes in MRBs	59	51
Balance as of end-of-year, before the effect of changes in non-performance risk	(2,337)	(2,878)
Effect of cumulative changes in non-performance risk	(539)	(726)
Balance as of end-of-period	(2,876)	(3,604)
Less: Ceded MRB assets (liabilities)	(312)	(358)
Balance as of end-of-period, net of reinsurance	$ (2,564)	$ (3,246)
Weighted-average age of policyholders (years)	73 years	72 years
Net amount at risk	$ 2,518	$ 2,056
Variable Annuities | Cumulative Effect, Period of Adoption, Adjustment
Market Risk Benefit [Roll Forward]
Balance as of beginning-of-year	(153)	(1,299)
Fixed Annuities
Market Risk Benefit [Roll Forward]
Balance as of beginning-of-year	32	32
Balance as of beginning-of-period, before the effect of changes in non-performance risk	65	90
Issuances	0	0
Attributed fees collected	8	9
Benefit payments	0	0
Effect of changes in interest rates	39	(17)
Effect of changes in equity markets	2	(11)
Effect of changes in equity index volatility	0	(2)
In-force updates and other changes in MRBs	(2)	1
Balance as of end-of-year, before the effect of changes in non-performance risk	112	70
Effect of cumulative changes in non-performance risk	(48)	(43)
Balance as of end-of-period	64	27
Less: Ceded MRB assets (liabilities)	0	0
Balance as of end-of-period, net of reinsurance	$ 64	$ 27
Weighted-average age of policyholders (years)	70 years	69 years
Net amount at risk	$ 255	$ 210
Fixed Annuities | Cumulative Effect, Period of Adoption, Adjustment
Market Risk Benefit [Roll Forward]
Balance as of beginning-of-year	(33)	(58)
Retirement Plan Services
Market Risk Benefit [Roll Forward]
Balance as of beginning-of-year	(42)	(30)
Balance as of beginning-of-period, before the effect of changes in non-performance risk	(42)	(26)
Issuances	0	0
Attributed fees collected	1	2
Benefit payments	0	0
Effect of changes in interest rates	1	(6)
Effect of changes in equity markets	2	(4)
Effect of changes in equity index volatility	0	0
In-force updates and other changes in MRBs	1	1
Balance as of end-of-year, before the effect of changes in non-performance risk	(37)	(33)
Effect of cumulative changes in non-performance risk	(2)	(2)
Balance as of end-of-period	(39)	(35)
Less: Ceded MRB assets (liabilities)	0	0
Balance as of end-of-period, net of reinsurance	$ (39)	$ (35)
Weighted-average age of policyholders (years)	63 years	63 years
Net amount at risk	$ 4	$ 3
Retirement Plan Services | Cumulative Effect, Period of Adoption, Adjustment
Market Risk Benefit [Roll Forward]
Balance as of beginning-of-year	$ 0	$ (4)