XML 200 R142.htm IDEA: XBRL DOCUMENT v3.8.0.1

Employee Benefit Plans - Obligations and Funded Status, Additional Information (Details) - USD ($) $ in Millions		12 Months Ended
	Jun. 30, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair value of plan assets had fair value of rabbi trusts been included		$ 3,736	$ 4,811
Funded status of plan had fair value of rabbi trust assets been included		(640)	(840)
Separate Account Assets
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair value of plan assets		3,700	4,800
Pension Benefits
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Changes in assumptions, discount rate		$ 350	$ 21
Discount rate		3.73%	4.22%
Changes in assumptions, mortality tables			$ 51
Assets held in rabbi trusts and designated for the non-qualified pension plans		$ 144	132
Fair value of plan assets		3,592	4,678	$ 4,430
Transferred pension obligation	$ 1,600	1,647	$ 0
After-tax settlement charge	$ 750	$ 488

X

- Definition

Assets held in rabbi trusts and designated for non qualified pension plans.

+ References

No definition available.

+ Details

Name:	hig_AssetsHeldInTrustsAndDesignatedForNonQualifiedPensionPlans
Namespace Prefix:	hig_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Defined Benefit Plan, Changes in Assumptions, Discount Rate

+ References

No definition available.

+ Details

Name:	hig_DefinedBenefitPlanChangesinAssumptionsDiscountRate
Namespace Prefix:	hig_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Defined Benefit Plan, Changes in Assumptions, Mortality Tables

+ References

No definition available.

+ Details

Name:	hig_DefinedBenefitPlanChangesinAssumptionsMortalityTables
Namespace Prefix:	hig_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlements, Net of Tax

+ References

No definition available.

+ Details

Name:	hig_DefinedBenefitPlanNetPeriodicBenefitCostCreditGainLossDuetoSettlementsNetofTax
Namespace Prefix:	hig_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Fair value of pension plan assets under rabbi trust.

+ References

No definition available.

+ Details

Name:	hig_FairValueOfPensionPlanAssetsUnderRabbiTrust
Namespace Prefix:	hig_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Funded status of pension benefits including fair value of pension plan assets under rabbi trust.

+ References

No definition available.

+ Details

Name:	hig_FundedStatusOfPensionBenefitsIncludingFairValueOfPensionPlanAssetsUnderRabbiTrust
Namespace Prefix:	hig_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Weighted average rate for present value of future retirement benefits cash flows, used to determine benefit obligation of defined benefit plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (k)(1)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920

+ Details

Name:	us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Fair value of assets that have been segregated and restricted to provide pension or postretirement benefits. Assets include, but are not limited to, stocks, bonds, other investments, earnings from investments, and contributions by the employer and employees.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920

+ Details

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

X

- Definition

Amount of (increase) decrease to benefit obligation of defined benefit plan from irrevocable action relieving primary responsibility for benefit obligation and eliminating risk for obligation and assets used to effect settlement. Includes, but is not limited to, lump-sum cash payment to participant in exchange for right to receive specified benefits, purchase of nonparticipating annuity contract and change from remeasurement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (a)(10)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920

+ Details

Name:	us-gaap_DefinedBenefitPlanSettlementsBenefitObligation
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

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

X

- Details

Name:	us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=hig_SeparateAccountsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RetirementPlanTypeAxis=us-gaap_PensionPlansDefinedBenefitMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: