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Commitments and Contingencies - Additional Information (Details) - USD ($) $ in Millions	9 Months Ended	12 Months Ended	93 Months Ended
	Sep. 30, 2024	Dec. 31, 2016	Sep. 30, 2024	Dec. 31, 2023
Reinsurance Contract [Axis]: Adverse Development Cover Navigators Group
Loss Contingencies [Line Items]
Change in Deferred Gain on Retroactive Reinsurance	$ 122		$ 122	$ 209
Reinsurance Contract [Axis]: Adverse Development Cover Navigators Group | Maximum
Loss Contingencies [Line Items]
Reinsurance, Excess Retention, Amount Reinsured, Per Policy	300
Asbestos and Environmental
Loss Contingencies [Line Items]
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net, Not Separately Presented	133		133
Asbestos and Environmental | Reinsurance Contract [Axis]: Asbestos and Environmental
Loss Contingencies [Line Items]
Change in Deferred Gain on Retroactive Reinsurance	788		788
Reinsurance, Amount Retained, Per Policy		$ 1,700
Reinsurance Retention Policy, Excess Retention, Amount Reinsured			$ 1,438
Asbestos and Environmental | Reinsurance Contract [Axis]: Asbestos and Environmental | Remaining [Member]
Loss Contingencies [Line Items]
Reinsurance, Excess Retention, Amount Reinsured, Per Policy	62
Asbestos and Environmental | Reinsurance Contract [Axis]: Asbestos and Environmental | Maximum
Loss Contingencies [Line Items]
Reinsurance, Excess Retention, Amount Reinsured, Per Policy	$ 1,500

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Amount of deferred income and obligation to transfer product and service to customer for which consideration has been received or is receivable.

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