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Investments - Concentration of Credit Risk (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
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%

X

- Definition

The percent of invested assets by the Company's largest exposure by issuer.

+ References

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- Definition

The percent of invested assets by the Company's largest exposure by sector.

+ References

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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

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Details

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