XML 162 R101.htm IDEA: XBRL DOCUMENT
v3.25.0.1

Reinsurance - Additional Information (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Reinsurance Policy, Type [Axis]: Adverse Development Cover Navigators Group |  |  |
Policyholder Benefits and Claims Incurred, Ceded | $ 300 |  |
Reinsurance Policy, Type [Axis]: Adverse Development Cover Navigators Group | Remaining [Member] |  |  |
Reinsurance, Excess Retention, Amount Reinsured, Per Policy | 0 |  |
Reinsurance Policy, Type [Axis]: Asbestos and Environmental | Asbestos and Environmental |  |  |
Policyholder Benefits and Claims Incurred, Ceded | 1,500 |  |
Reinsurance Policy, Type [Axis]: Asbestos and Environmental | Remaining [Member] | Asbestos and Environmental |  |  |
Reinsurance, Excess Retention, Amount Reinsured, Per Policy | 0 |  |
Property and Casualty Insurance Products |  |  |
Policyholder Benefits and Claims Incurred, Ceded | 1,241 | $ 1,043 | $ 1,338
Group Insurance Policy [Member] |  |  |
Policyholder Benefits and Claims Incurred, Ceded | 120 | $ 93 | $ 81
Maximum | Reinsurance Policy, Type [Axis]: Adverse Development Cover Navigators Group |  |  |
Reinsurance, Excess Retention, Amount Reinsured, Per Policy | 300 |  |
Maximum | Reinsurance Policy, Type [Axis]: Asbestos and Environmental | Asbestos and Environmental |  |  |
Reinsurance, Excess Retention, Amount Reinsured, Per Policy | 1,500 |  |
Maximum | The Navigators Group, Inc. [Member] | Reinsurance Policy, Type [Axis]: Adverse Development Cover Navigators Group |  |  |
Reinsurance, Excess Retention, Amount Reinsured, Per Policy | $ 300 |  |

X
- Definition Amount of reduction of provision for policy benefits and costs incurred for policies ceded. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479838/944-20-50-3 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(5)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477250/944-220-S99-1 + Details
Name: | us-gaap_ReinsuranceEffectOnClaimsAndBenefitsIncurredAmountCeded
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount per policy of risk ceded to reinsurer in excess of risk undertaken originally by insurer that is not ceded to reinsurer. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479838/944-20-50-3 + Details
Name: | us-gaap_ReinsuranceRetentionExcessRetentionAmountReinsuredPerPolicy
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_ReinsuranceContractAxis=Adverse Development Cover Navigators Group
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | hig_AmountAxis=hig_RemainingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ReinsuranceContractAxis=Asbestos and Environmental
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_NoncatastrophicEventAxis=hig_AsbestosandEnvironmentalMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ProductOrServiceAxis=us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ProductOrServiceAxis=us-gaap_GroupPoliciesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_BusinessAcquisitionAxis=hig_TheNavigatorsGroupInc.Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |