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Investments - Concentration of Credit Risk (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
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Schedule of Investments [Line Items] |  |
Fair Value, Concentration of Risk, Investments | $ 0 | $ 0
Residential Mortgage Backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Largest exposure by sector, percent of invested assets | 7.00% |
CMBS |  |
Schedule of Investments [Line Items] |  |
Largest exposure by sector, percent of invested assets |  | 7.00%
Financial Services Sector [Member] |  |
Schedule of Investments [Line Items] |  |
Largest exposure by sector, percent of invested assets | 9.00% | 8.00%
Debt Security, Corporate, US | Toronto Dominion Bank |  |
Schedule of Investments [Line Items] |  |
Largest exposure by issuer, percent of invested assets (less than) | 1.00% |
Debt Security, Corporate, US | Morgan Stanley |  |
Schedule of Investments [Line Items] |  |
Largest exposure by issuer, percent of invested assets (less than) | 1.00% |
Debt Security, Corporate, US | Mitsubishi UFJ Financial Group |  |
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%
Debt Security, Corporate, US | IBM Corporation [Member] |  |
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 | 12.00% | 14.00%
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%

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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 https://asc.fasb.org/extlink&oid=123594938&loc=d3e13531-108611 + Details
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