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Investments - Investments - Purchased Financial Assets with Credit Deterioration (Details) | Jun. 30, 2020 USD ($)
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Schedule of Investments [Line Items] |
Debt Securities, Available-for-sale, Purchased with Credit Deterioration, Amount at Purchase Price | $ 0
Commercial Loan [Member] |
Schedule of Investments [Line Items] |
Financing Receivables, Purchased with Credit Deterioration | $ 0

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- Definition Debt Securities, Available-for-sale, Purchased with Credit Deterioration + References No definition available. + Details
Name: | hig_DebtSecuritiesAvailableforsalePurchasedwithCreditDeterioration
Namespace Prefix: | hig_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Financing Receivables, Purchased with Credit Deterioration + References No definition available. + Details
Name: | hig_FinancingReceivablesPurchasedwithCreditDeterioration
Namespace Prefix: | hig_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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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. + References No definition available. + Details
Name: | us-gaap_ScheduleOfInvestmentsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_CommercialLoanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |