Investments - Concentration of Credit Risk (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
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	9.00%	8.00%
Financial Services Sector [Member]
Schedule of Investments [Line Items]
Largest exposure by sector, percent of invested assets	11.00%	9.00%
Debt Security, Corporate, US \| hig_Next Era Energy Inc
Schedule of Investments [Line Items]
Largest exposure by issuer, percent of invested assets (less than)	1.00%	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%	1.00%
Municipal
Schedule of Investments [Line Items]
Largest exposure by sector, percent of invested assets	9.00%	11.00%
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%	1.00%

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

No definition available.

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Data Type:	dtr-types1:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

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

+ References

No definition available.

+ Details

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Data Type:	dtr-types1:percentItemType
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Period Type:	instant

- Definition

Fair value of investment subject to concentration of credit or market risk or both.

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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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