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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 |

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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 Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 4B -URI http://asc.fasb.org/extlink&oid=116884468&loc=SL65671311-158438 + Details
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