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Commitments and Contingencies - Additional Information (Details) - USD ($) $ in Millions	9 Months Ended	12 Months Ended	57 Months Ended
	Sep. 30, 2021	Dec. 31, 2016	Sep. 30, 2021
Loss Contingencies [Line Items]
Liability for unpaid losses and loss adjustment expenses, at undiscounted amounts	$ 621		$ 621
Asbestos and Environmental
Loss Contingencies [Line Items]
Reinsurance Retention Policy, Amount Retained		$ 1,700
Asbestos Issue
Loss Contingencies [Line Items]
Liability for unpaid losses and loss adjustment expenses, at undiscounted amounts	621		621
Environmental Issue
Loss Contingencies [Line Items]
Liability for unpaid losses and loss adjustment expenses, at undiscounted amounts	25		25
Asbestos and Environmental | Asbestos and Environmental
Loss Contingencies [Line Items]
Change in Deferred Gain on Retroactive Reinsurance	210		210
Reinsurance Retention Policy, Excess Retention, Amount Reinsured			$ 860
Asbestos and Environmental | Asbestos and Environmental | Remaining [Member]
Loss Contingencies [Line Items]
Maximum adverse loss development to be ceded under agreement	640
Maximum | Asbestos and Environmental
Loss Contingencies [Line Items]
Maximum adverse loss development to be ceded under agreement	$ 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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