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Commitments and Contingencies - Additional Information (Details) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2021	Dec. 31, 2016
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	$ 646
Environmental Issue
Loss Contingencies [Line Items]
Liability for unpaid losses and loss adjustment expenses, at undiscounted amounts	74
Asbestos and Environmental | Asbestos and Environmental
Loss Contingencies [Line Items]
Change in Deferred Gain on Retroactive Reinsurance	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

X

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
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- Definition

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+ References

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- Definition

Amount of reduction of provision for policy benefits and costs incurred for policies ceded.

+ References

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-Name Accounting Standards Codification
-Topic 944
-SubTopic 20
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Stated amount that is the upper retention limit per entity policy.

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- Definition

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+ References

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- Definition

Undiscounted amount, after reinsurance, of the liability for unpaid claims and allocated claim adjustment expense for short-duration insurance contracts for accident years not separately presented in claim development information. Excludes unallocated claim adjustment expense.

+ References

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