Reinsurance - Schedule of Reinsurance (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Premiums earned:
Gross amounts	$ 1,387	$ 1,344	$ 2,871	$ 2,411
Reinsurance ceded	(382)	(342)	(722)	(628)
Net premiums earned	1,005	1,002	2,149	1,783
Other policy revenue:
Gross amounts	203	103	315	200
Reinsurance ceded	(19)	0	(19)	0
Other policy revenue	184	103	296	200
Policyholder benefits paid and claims incurred:
Gross amounts	1,296	1,171	2,588	2,029
Reinsurance ceded	(266)	(182)	(472)	(340)
Net benefits paid and claims incurred	1,030	989	2,116	1,689
Change in fair value of market risk benefits:
Gross amounts	148	(24)	186	(14)
Reinsurance ceded	(9)	12	(28)	7
Change in fair value of market risk benefits	139	(12)	158	(7)
Interest sensitive contract benefits:
Gross amounts	506	175	765	365
Reinsurance ceded	(116)	(59)	(220)	(160)
Interest sensitive contract benefits	$ 390	$ 116	$ 545	$ 205

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Other Policy Revenue, Gross

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Amount of gain (loss) from (increase) decrease in fair value of contract or contract feature in long-duration contract issued by insurance entity that both protects contract holder from other-than-nominal capital market risk and exposes insurance entity to other-than-nominal capital market risk. Excludes change attributable to instrument-specific credit risk.

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