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v3.21.2

Reserve for Unpaid Losses and Loss Adjustment Expenses - GB Additional information (Details) - USD ($) $ in Millions | 6 Months Ended
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Jun. 30, 2021 | Jun. 30, 2020
Liability for Claims and Claims Adjustment Expense [Line Items] |  |
us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense_BSASettlement | $ 650 |
Group Benefits |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |
Prior incurral year development [2] | (282) | $ (315)
Group Benefits | group life term, disability and accident [Member] |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |
Prior incurral year development [2] | 30 | 65
Group Benefits | Accident and Health Insurance Product Line [Member] |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |
Prior incurral year development [2] | $ 10 | $ 20

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- Definition us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense_BSASettlement + References No definition available. + Details
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Namespace Prefix: | hig_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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

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- Definition Amount, after effects of reinsurance, of expense (reversal of expense) for claims incurred in prior reporting periods and related claims settlement costs. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=116884095&loc=d3e14764-158437 + Details
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Balance Type: | debit
Period Type: | duration

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- Details
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- Details
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