Reinsurance - Schedule of Reinsurance (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Premiums earned:
Gross amounts	$ 1,253	$ 1,090	$ 4,124	$ 3,501
Reinsurance ceded	(365)	(306)	(1,087)	(934)
Net premiums earned	888	784	3,037	2,567
Other policy revenue:
Gross amounts	212	106	527	306
Reinsurance ceded	(4)	0	(23)	0
Other policy revenue	208	106	504	306
Policyholder benefits paid and claims incurred:
Gross amounts	1,183	928	3,771	2,957
Reinsurance ceded	(337)	(211)	(809)	(551)
Net benefits paid and claims incurred	846	717	2,962	2,406
Change in fair value of market risk benefits:
Gross amounts	110	(27)	296	(41)
Reinsurance ceded	24	13	(4)	20
Change in fair value of market risk benefits	134	(14)	292	(21)
Interest sensitive contract benefits:
Gross amounts	629	238	1,394	603
Reinsurance ceded	(106)	(105)	(326)	(265)
Interest sensitive contract benefits	$ 523	$ 133	$ 1,068	$ 338

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Interest Sensitive Contract Benefits, Gross

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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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Amount, after effects of policies assumed or ceded, of expense related to the provision for policy benefits and costs incurred.

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