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Available-For-Sale Fixed Maturity Securities - Narrative (Details) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
Debt Securities, Available-for-Sale [Line Items]
Available-for-sale fixed maturity securities, at fair value	$ 45,683	$ 12,877
Securities purchased under agreements to resell	400	0
Securities purchased under agreements to resell, fair value of collateral	$ 817	$ 0
Debt securities, available-for-sale, unrealized loss position, percentage of investments in the top two designations for investment grade	81.00%	87.00%
Deposits
Debt Securities, Available-for-Sale [Line Items]
Available-for-sale fixed maturity securities, at fair value	$ 65	$ 54
Bonds pledged | Bonds
Debt Securities, Available-for-Sale [Line Items]
Available-for-sale fixed maturity securities, at fair value	$ 10,600	$ 39

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Amount excluding accrued interest, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount, after the effects of master netting arrangements, of funds outstanding loaned in the form of a security resale agreement between the entity and another party for the purchase and resale of identical or substantially the same securities at a date certain for a specified price. Includes purchases of participations in pools of securities that are subject to a resale agreement, assets not subject to a master netting arrangement and not elected to be offset.

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Fair value of securities received as collateral against securities purchased under agreement to resell.

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