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Reinsurance - Additional Information (Details) - USD ($) $ in Millions |  | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items] |  |  |  |
Ceded losses |  | $ 661 | $ 901 | $ 388
Asbestos and Environmental |  |  |  |
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items] |  |  |  |
Reinsurance premium |  |  |  | 650
Reinsurance Retention Policy, Excess Retention, Amount Reinsured | $ 977 |  |  |
Unpaid Losses and Loss Adjustment Expenses |  | 1,700 |  |
Accrued reinsurance premium |  |  |  | 650
Ceded losses |  | 523 |  |
Asbestos and Environmental |  |  |  |
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items] |  |  |  |
Reinsurance premium |  |  |  | $ 650
Asbestos and Environmental | Maximum |  |  |  |
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items] |  |  |  |
Reinsurance Retention Policy, Excess Retention, Amount Reinsured |  | $ 1,500 |  |

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- Definition Cash payments made for reinsurance during the current period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3536-108585 + Details
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- Definition Amount of reduction of provision for policy benefits and costs incurred for policies ceded. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 20 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=99397103&loc=d3e6811-158387 + Details
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- Definition The carrying amount as of the balance sheet date of the known and estimated amounts owed to insurers under reinsurance treaties or other arrangements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.13(a)(3),(c)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition Stated amount that is the upper retention limit per entity policy. + References No definition available. + Details
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- Definition Amount of risk reinsured in excess of stated retention per company policy. + References No definition available. + Details
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