Average debt service coverage ratio.

No definition available.

Name:	hig_AverageDebtServiceCoverageRatio
Namespace Prefix:	hig_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953423-111524

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(7)(2))
-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=121599878&loc=SL82895884-210446

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 13
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919249-210447

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 13
-Subparagraph (f)
-URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919249-210447

+ Details

Name:	us-gaap_FinancingReceivableAllowanceForCreditLosses
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of financing receivable originated more than five years prior to current fiscal year.

+ References

+ Details

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

- Definition

Amount of financing receivable originated four years prior to current fiscal year.

+ References

+ Details

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

- Definition

Amount of financing receivable originated in current fiscal year.

+ References

+ Details

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

- Definition

Amount of financing receivable originated in fiscal year prior to current fiscal year.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919232-210447

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 55
-Paragraph 79
-URI http://asc.fasb.org/extlink&oid=121647567&loc=SL82922352-210448

+ Details

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

- Definition

Amount of financing receivable originated three years prior to current fiscal year.

+ References

+ Details

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

- Definition

Amount of financing receivable originated two years prior to current fiscal year.

+ References

+ Details

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

- Definition

Amount, before allowance for credit loss, of financing receivable.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 55
-Paragraph 79
-URI http://asc.fasb.org/extlink&oid=121647567&loc=SL82922352-210448

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 5
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919230-210447

Reference 3: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 55
-Paragraph 80
-URI http://asc.fasb.org/extlink&oid=121647567&loc=SL82922355-210448

+ Details

Name:	us-gaap_NotesReceivableGross
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_CommercialLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	hig_OriginationDateAxis=hig_OriginatedInCurrentFiscalYearMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	hig_OriginationDateAxis=hig_OriginatedInFiscalYearBeforeLatestFiscalYearMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	hig_OriginationDateAxis=hig_OriginatedTwoYearsBeforeLatestFiscalYearMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	hig_OriginationDateAxis=hig_OriginatedThreeYearsBeforeLatestFiscalYearMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	hig_OriginationDateAxis=hig_OriginatedFourYearsBeforeLatestFiscalYearMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	hig_OriginationDateAxis=hig_OriginatedFiveOrMoreYearsBeforeLatestFiscalYearMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LoanToValueAxis=hig_LTVBetween65to80PercentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LoanToValueAxis=hig_LTVLessthan65PercentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	hig_ValueTypeAxis=hig_AmortizedCostMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Investments - Commercial Mortgage Loans LTV & DSCR (Details) $ in Millions	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Schedule of Investments [Line Items]
Financing Receivable, before Allowance for Credit Loss		$ 4,215
Financing Receivable, Allowance for Credit Loss		$ 0
Commercial Loan [Member]
Schedule of Investments [Line Items]
Avg. Debt-Service Coverage Ratio	2.52	2.46
Financing Receivable, before Allowance for Credit Loss	$ 4,531	$ 4,215
Financing Receivable, Allowance for Credit Loss	$ 38	$ 0	$ 1	$ 1
Commercial Loan [Member] \| Originated in Current Fiscal Year [Member]
Schedule of Investments [Line Items]
Avg. Debt-Service Coverage Ratio	2.52
Commercial Loan [Member] \| Originated in Fiscal Year before Latest Fiscal Year [Member]
Schedule of Investments [Line Items]
Avg. Debt-Service Coverage Ratio	2.51
Commercial Loan [Member] \| Originated Two Years before Latest Fiscal Year [Member]
Schedule of Investments [Line Items]
Avg. Debt-Service Coverage Ratio	1.94
Commercial Loan [Member] \| Originated Three Years before Latest Fiscal Year [Member]
Schedule of Investments [Line Items]
Avg. Debt-Service Coverage Ratio	1.90
Commercial Loan [Member] \| Originated Four Years before Latest Fiscal Year [Member]
Schedule of Investments [Line Items]
Avg. Debt-Service Coverage Ratio	2.80
Commercial Loan [Member] \| Originated Five or More Years before Latest Fiscal Year [Member]
Schedule of Investments [Line Items]
Avg. Debt-Service Coverage Ratio	2.92
Commercial Loan [Member] \| 65% - 80%
Schedule of Investments [Line Items]
Avg. Debt-Service Coverage Ratio	1.59	1.53
Financing Receivable, before Allowance for Credit Loss		$ 376
Commercial Loan [Member] \| 65% - 80% \| Originated in Current Fiscal Year [Member]
Schedule of Investments [Line Items]
Avg. Debt-Service Coverage Ratio	1.62
Commercial Loan [Member] \| 65% - 80% \| Originated in Fiscal Year before Latest Fiscal Year [Member]
Schedule of Investments [Line Items]
Avg. Debt-Service Coverage Ratio	1.58
Commercial Loan [Member] \| 65% - 80% \| Originated Two Years before Latest Fiscal Year [Member]
Schedule of Investments [Line Items]
Avg. Debt-Service Coverage Ratio	1.33
Commercial Loan [Member] \| 65% - 80% \| Originated Three Years before Latest Fiscal Year [Member]
Schedule of Investments [Line Items]
Avg. Debt-Service Coverage Ratio	2.02
Commercial Loan [Member] \| 65% - 80% \| Originated Four Years before Latest Fiscal Year [Member]
Schedule of Investments [Line Items]
Avg. Debt-Service Coverage Ratio	1.92
Commercial Loan [Member] \| 65% - 80% \| Originated Five or More Years before Latest Fiscal Year [Member]
Schedule of Investments [Line Items]
Avg. Debt-Service Coverage Ratio	1.74
Commercial Loan [Member] \| Less than 65%
Schedule of Investments [Line Items]
Avg. Debt-Service Coverage Ratio	2.69	2.56
Financing Receivable, before Allowance for Credit Loss		$ 3,839
Commercial Loan [Member] \| Less than 65% \| Originated in Current Fiscal Year [Member]
Schedule of Investments [Line Items]
Avg. Debt-Service Coverage Ratio	2.56
Commercial Loan [Member] \| Less than 65% \| Originated in Fiscal Year before Latest Fiscal Year [Member]
Schedule of Investments [Line Items]
Avg. Debt-Service Coverage Ratio	2.85
Commercial Loan [Member] \| Less than 65% \| Originated Two Years before Latest Fiscal Year [Member]
Schedule of Investments [Line Items]
Avg. Debt-Service Coverage Ratio	2.25
Commercial Loan [Member] \| Less than 65% \| Originated Three Years before Latest Fiscal Year [Member]
Schedule of Investments [Line Items]
Avg. Debt-Service Coverage Ratio	1.89
Commercial Loan [Member] \| Less than 65% \| Originated Four Years before Latest Fiscal Year [Member]
Schedule of Investments [Line Items]
Avg. Debt-Service Coverage Ratio	2.99
Commercial Loan [Member] \| Less than 65% \| Originated Five or More Years before Latest Fiscal Year [Member]
Schedule of Investments [Line Items]
Avg. Debt-Service Coverage Ratio	3.01
Commercial Loan [Member] \| Amortized Cost [Member]
Schedule of Investments [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	$ 687
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	919
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	622
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	491
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	286
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	1,526
Financing Receivable, before Allowance for Credit Loss	4,531
Commercial Loan [Member] \| Amortized Cost [Member] \| 65% - 80%
Schedule of Investments [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	28
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	243
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	212
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	45
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	51
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	115
Financing Receivable, before Allowance for Credit Loss	694
Commercial Loan [Member] \| Amortized Cost [Member] \| Less than 65%
Schedule of Investments [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	659
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	676
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	410
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	446
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	235
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	1,411
Financing Receivable, before Allowance for Credit Loss	$ 3,837