MRBs - Summary of Balances of Changes in Net MRB (Assets) Liabilities (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Market Risk Benefit [Roll Forward]
Balance as of beginning-of-year	$ (729)
Balance as of end-of-year	(2,178)	$ (729)
Variable Annuities
Market Risk Benefit [Roll Forward]
Balance as of beginning-of-year	(662)	2,398
Balance as of beginning-of-year, before the effect of changes in non-performance risk	1,511	4,823
Issuances	8	12
Attributed fees collected	1,497	1,571
Benefit payments	(64)	(63)
Effect of changes in interest rates	(110)	(9,346)
Effect of changes in equity markets	(3,167)	4,293
Effect of changes in equity index volatility	(593)	(225)
In-force updates and other changes in MRBs	136	661
Effect of changes in future expected policyholder behavior	(33)	(158)
Effect of changes in future expected assumptions	(66)	(57)
Balance as of end-of-year, before the effect of changes in non-performance risk	(881)	1,511
Effect of cumulative changes in non-performance risk	(1,299)	(2,173)
Balance as of end-of-year	(2,180)	(662)
Less: ceded MRB assets (liabilities)	(238)	(193)
Balance as of end-of-year, net of reinsurance	$ (1,942)	$ (469)
Weighted-average age of policyholders (years)	72 years	71 years
Net amount at risk	$ 3,031	$ 7,974
Variable Annuities | Cumulative Effect, Period of Adoption, Adjustment
Market Risk Benefit [Roll Forward]
Balance as of beginning-of-year	(2,173)	(2,425)
Balance as of end-of-year		(2,173)
Fixed Annuities
Market Risk Benefit [Roll Forward]
Balance as of beginning-of-year	(45)	114
Balance as of beginning-of-year, before the effect of changes in non-performance risk	(5)	158
Issuances	0	0
Attributed fees collected	32	32
Benefit payments	0	0
Effect of changes in interest rates	(24)	(232)
Effect of changes in equity markets	(12)	12
Effect of changes in equity index volatility	9	14
In-force updates and other changes in MRBs	5	10
Effect of changes in future expected policyholder behavior	70	1
Effect of changes in future expected assumptions	15	0
Balance as of end-of-year, before the effect of changes in non-performance risk	90	(5)
Effect of cumulative changes in non-performance risk	(58)	(40)
Balance as of end-of-year	32	(45)
Less: ceded MRB assets (liabilities)	0	0
Balance as of end-of-year, net of reinsurance	$ 32	$ (45)
Weighted-average age of policyholders (years)	68 years	68 years
Net amount at risk	$ 203	$ 171
Fixed Annuities | Cumulative Effect, Period of Adoption, Adjustment
Market Risk Benefit [Roll Forward]
Balance as of beginning-of-year	(40)	(44)
Balance as of end-of-year		(40)
Retirement Plan Services
Market Risk Benefit [Roll Forward]
Balance as of beginning-of-year	(22)	(1)
Balance as of beginning-of-year, before the effect of changes in non-performance risk	(20)	12
Issuances	0	(3)
Attributed fees collected	6	6
Benefit payments	0	0
Effect of changes in interest rates	5	(55)
Effect of changes in equity markets	(13)	18
Effect of changes in equity index volatility	(3)	(1)
In-force updates and other changes in MRBs	1	3
Effect of changes in future expected policyholder behavior	0	0
Effect of changes in future expected assumptions	(2)	0
Balance as of end-of-year, before the effect of changes in non-performance risk	(26)	(20)
Effect of cumulative changes in non-performance risk	(4)	(2)
Balance as of end-of-year	(30)	(22)
Less: ceded MRB assets (liabilities)	0	0
Balance as of end-of-year, net of reinsurance	$ (30)	$ (22)
Weighted-average age of policyholders (years)	63 years	63 years
Net amount at risk	$ 4	$ 15
Retirement Plan Services | Cumulative Effect, Period of Adoption, Adjustment
Market Risk Benefit [Roll Forward]
Balance as of beginning-of-year	$ (2)	(13)
Balance as of end-of-year		$ (2)