Reinsurance - Narrative (Details) $ in Millions	Mar. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Oct. 01, 2023 agreement
Ceded Credit Risk [Line Items]
Number of reinsurance recoverable agreements \| agreement			2
Deposit assets, net of allowance for credit losses	$ 28,904	$ 28,789
Investments	125,702	124,331
Fortitude Re
Ceded Credit Risk [Line Items]
Deposits assets	7,800	7,800
Investments	9,800	9,900
Fixed Annuities \| Fortitude Re
Ceded Credit Risk [Line Items]
Reinsurance recoverables	10,500	10,500
Reinsurance recoverables on unpaid losses	2,700	2,700
Reinsurance recoverable for unpaid claims and claims adjustments	22
Deposit assets, net of allowance for credit losses	$ 3,900	$ 4,200

Number Of Reinsurance Recoverable Agreements

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The carrying amount of the asset transferred to a third party to serve as a deposit, which typically serves as security against failure by the transferor to perform under terms of an agreement.

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Sum of the carrying amounts as of the balance sheet date of all investments.

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Amount, after valuation allowance, recoverable under reinsurance contracts for losses reported to the ceding insurer but not yet paid and amounts expected for incurred losses and settlement expenses, which have not yet been reported to the ceding insurer.

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Amount before valuation allowance recoverable under reinsurance contracts. Examples include, but are not limited to, settled and unsettled claims, incurred but not reported losses, loss adjustment expense, premium paid, policy benefits and policy reserves.

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Amount before valuation allowance of reinsurance recoverables for losses reported to the ceding insurer but not yet paid, and for amounts expected based upon statistical projections and other measures of incurred losses and loss settlement expenses which have not yet been reported to the ceding insurer.

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