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Investments - Concentration of Credit Risk (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
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Schedule of Investments [Line Items] |  |
Fair Value, Concentration of Risk, Investments | $ 0 | $ 0
CMBS |  |
Schedule of Investments [Line Items] |  |
Largest exposure by sector, percent of invested assets | 7.00% | 8.00%
Financial Services Sector [Member] |  |
Schedule of Investments [Line Items] |  |
Largest exposure by sector, percent of invested assets | 8.00% | 9.00%
Debt Security, Government, Non-US [Member] | Government of Canada |  |
Schedule of Investments [Line Items] |  |
Largest exposure by issuer, percent of invested assets (less than) | 1.00% |
Municipal |  |
Schedule of Investments [Line Items] |  |
Largest exposure by sector, percent of invested assets | 14.00% | 17.00%
Municipal | New York State Dormitory Authority [Member] |  |
Schedule of Investments [Line Items] |  |
Largest exposure by issuer, percent of invested assets (less than) |  | 1.00%
Debt Security, Corporate, US | Apple Inc. [Member] |  |
Schedule of Investments [Line Items] |  |
Largest exposure by issuer, percent of invested assets (less than) | 1.00% | 1.00%
Debt Security, Corporate, US | IBM Corporation [Member] |  |
Schedule of Investments [Line Items] |  |
Largest exposure by issuer, percent of invested assets (less than) | 1.00% | 1.00%

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- Definition The percent of invested assets by the Company's largest exposure by sector. + References No definition available. + Details
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- Definition This item represents disclosure of all significant concentrations of credit risk or market risk arising from the subject financial instrument (as defined), whether from an individual counterparty or groups of counterparties. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=123594938&loc=d3e13531-108611 + Details
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