MRBs - Summary of Balances of Changes in Net MRB (Assets) Liabilities (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Market Risk Benefit [Roll Forward]
Balance as of beginning-of-year	$ (2,178)
Balance as of end-of-period	(3,612)
Variable Annuities
Market Risk Benefit [Roll Forward]
Balance as of beginning-of-year	(2,180)	$ (662)
Balance as of beginning-of-period, before the effect of changes in non-performance risk	(881)	1,511
Issuances	3	1
Attributed fees collected	380	379
Benefit payments	(11)	(19)
Effect of changes in interest rates	(1,081)	1,406
Effect of changes in equity markets	(1,343)	(1,029)
Effect of changes in equity index volatility	4	(286)
In-force updates and other changes in MRBs	51	76
Balance as of end-of-year, before the effect of changes in non-performance risk	(2,878)	2,039
Effect of cumulative changes in non-performance risk	(726)	(3,451)
Balance as of end-of-period	(3,604)	(1,412)
Less: ceded MRB assets (liabilities)	(358)	(246)
Balance as of end-of-period, net of reinsurance	$ (3,246)	$ (1,166)
Weighted-average age of policyholders (years)	72 years	71 years
Net amount at risk	$ 2,056	$ 6,268
Variable Annuities | Cumulative Effect, Period of Adoption, Adjustment
Market Risk Benefit [Roll Forward]
Balance as of beginning-of-year	(1,299)	(2,173)
Fixed Annuities
Market Risk Benefit [Roll Forward]
Balance as of beginning-of-year	32	(45)
Balance as of beginning-of-period, before the effect of changes in non-performance risk	90	(5)
Issuances	0	0
Attributed fees collected	9	9
Benefit payments	0	0
Effect of changes in interest rates	(17)	31
Effect of changes in equity markets	(11)	(2)
Effect of changes in equity index volatility	(2)	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	70	34
Effect of cumulative changes in non-performance risk	(43)	(65)
Balance as of end-of-period	27	(31)
Less: ceded MRB assets (liabilities)	0	0
Balance as of end-of-period, net of reinsurance	$ 27	$ (31)
Weighted-average age of policyholders (years)	69 years	68 years
Net amount at risk	$ 210	$ 192
Fixed Annuities | Cumulative Effect, Period of Adoption, Adjustment
Market Risk Benefit [Roll Forward]
Balance as of beginning-of-year	(58)	(40)
Retirement Plan Services
Market Risk Benefit [Roll Forward]
Balance as of beginning-of-year	(30)	(22)
Balance as of beginning-of-period, before the effect of changes in non-performance risk	(26)	(20)
Issuances	0	0
Attributed fees collected	2	2
Benefit payments	0	0
Effect of changes in interest rates	(6)	5
Effect of changes in equity markets	(4)	(6)
Effect of changes in equity index volatility	0	(2)
In-force updates and other changes in MRBs	1	0
Balance as of end-of-year, before the effect of changes in non-performance risk	(33)	(21)
Effect of cumulative changes in non-performance risk	(2)	(5)
Balance as of end-of-period	(35)	(26)
Less: ceded MRB assets (liabilities)	0	0
Balance as of end-of-period, net of reinsurance	$ (35)	$ (26)
Weighted-average age of policyholders (years)	63 years	63 years
Net amount at risk	$ 3	$ 9
Retirement Plan Services | Cumulative Effect, Period of Adoption, Adjustment
Market Risk Benefit [Roll Forward]
Balance as of beginning-of-year	$ (4)	$ (2)