Investments - Concentration of Credit Risk (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
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%

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

No definition available.

Name:	hig_LargestExposurebyIssuerPercentofInvestedAssets
Namespace Prefix:	hig_
Data Type:	dtr-types: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

Name:	hig_LargestExposurebySectorPercentofInvestedAssets
Namespace Prefix:	hig_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- 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

Name:	us-gaap_FairValueConcentrationOfRiskInvestments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- 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.

+ References

No definition available.

+ Details

Name:	us-gaap_ScheduleOfInvestmentsLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_CommercialMortgageBackedSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_EquitySecuritiesByIndustryAxis=us-gaap_FinancialServicesSectorMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_InvestmentTypeAxis=us-gaap_ForeignGovernmentDebtSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	hig_IssuerAxis=hig_GovernmentOfCanadaMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_InvestmentTypeAxis=us-gaap_MunicipalBondsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	hig_IssuerAxis=hig_NewYorkStateDormitoryAuthorityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_InvestmentTypeAxis=us-gaap_DomesticCorporateDebtSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	hig_IssuerAxis=hig_AppleIncMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	hig_IssuerAxis=hig_IBMCorporationMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: