Market Risk Benefits - Balances and Changes in Market Risk Benefit (Details) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2024	Dec. 31, 2023
Market Risk Benefit, Changes In Market Risk Benefit [Roll Forward]
Balance, beginning of period, net liability	$ 315
Balance, end of period, net liability	356	$ 315
Indexed annuities
Market Risk Benefit, Changes In Market Risk Benefit [Roll Forward]
Balance, beginning of period, net liability	314	164
Balance, beginning of period, before effect of changes in the instrument-specific credit risk	209	102
Issuances and benefit payments	29	(10)
Attributed fees collected and interest accrual	71	131
Actual policyholder behavior different from expected	19	27
Changes in assumptions and other	8	29
Effects of market related movements	(61)	(70)
Balance, end of period, before effect of changes in the instrument-specific credit risk	275	209
Effect of changes in the instrument-specific credit risk	80	105
Balance, end of period, net liability	$ 355	$ 314
Weighted-average attained age of policyholders weighted by total AV (years)	68 years 1 month 13 days	68 years 3 months 10 days
Net amount at risk	$ 1,185	$ 1,059
Fixed rate annuities
Market Risk Benefit, Changes In Market Risk Benefit [Roll Forward]
Balance, beginning of period, net liability	1	1
Balance, beginning of period, before effect of changes in the instrument-specific credit risk	1	1
Issuances and benefit payments	0	0
Attributed fees collected and interest accrual	0	0
Actual policyholder behavior different from expected	0	0
Changes in assumptions and other	0	0
Effects of market related movements	0	0
Balance, end of period, before effect of changes in the instrument-specific credit risk	1	1
Effect of changes in the instrument-specific credit risk	0	0
Balance, end of period, net liability	$ 1	$ 1
Weighted-average attained age of policyholders weighted by total AV (years)	72 years 6 months 14 days	72 years 7 months 2 days
Net amount at risk	$ 2	$ 2